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At least 1,387 records · Page 77
All sourcesNASA NTRSDOE OSTI
NASA NTRS1996

A Velocity Distribution Model for Steady State Heat Transfer

Consider a box that is filled with an ideal gas and that is aligned along Cartesian coordinates (x, y, z) having until length in the 'y' direction and unspecified length in the 'x' and 'z' directions. Heat is applied uniformly over the 'hot' end of the box (y = 1) and is removed uniformly over the 'cold' end (y = O) at a constant rate such that the ends of the box are maintained at temperatures T(sub 0) at y = O and T(sub 1) at y = 1. Let U, V, and W denote the respective velocity components of a molecule inside the box selected at some random time and at some location (x, y, z). If T(sub 0) = T(sub 1), then U, Y, and W are mutually independent and Gaussian, each with mean zero and variance RT(sub 0), where R is the gas constant. When T(sub 0) does not equal T(sub 1) the velocity components are not independent and are not Gaussian. Our objective is to characterize the joint distribution of the velocity components U, Y, and W as a function of y, and, in particular, to characterize the distribution of V given y. It is hoped that this research will lead to an increased physical understanding of the nature of turbulence.

Hall, Eric B.↗
NASA NTRS2025

Erosion Results of the MISSE 9-15 Polymers and Composites Experiment 1-4 (PCE 1-4)

Polymers and other oxidizable materials on the exterior of spacecraft in the low Earth orbit (LEO) space environment can be eroded from reaction with atomic oxygen (AO). Therefore, in order to design durable spacecraft it is important to know the extent of erosion that will occur during a mission. This can be determined by knowing the LEO AO erosion yield, E y (volume loss per incident oxygen atom), of materials susceptible to AO reaction. In addition, recent flight experiments have shown that the AO E y can vary with the AO fluence and/or solar exposure. Therefore, obtaining AO E y data for materials flown on various spaceflight missions is important. NASA Glenn Research Center has flown numerous experiments as part of the Materials International Space Station Experiment (MISSE) missions on the exterior of the International Space Station (ISS) to characterize the LEO E y of polymers, composites, protective coatings, and other spacecraft materials. Recently, four Glenn experiments with 365 flight (F) samples were flown on ISS’s MISSE-Flight Facility (MISSE-FF). These experiments are the Polymers and Composites Experiment-1 (PCE-1) flown as part of the MISSE-9 mission, the PCE-2 flown as part of the MISSE-10 mission, the PCE-3 flown as part of the MISSE-12 and MISSE-15 missions, and the PCE-4 flown as part of the MISSE-13 mission. Although each experiment had numerous sample objectives, the primary objective was to determine the LEO AO E y of various spacecraft materials as a function of solar irradiation and AO fluence. This paper provides a summary of the erosion data for the PCE 1-4 AO E y samples. The AO E y for 150 samples flown in either the LEO ram, wake, zenith or nadir directions are provided. The AO ram fluence varied from 2.97×10 20 atoms/cm 2 after 0.89 years of direct space exposure (with relatively high levels of Si contamination) on MISSE 12 to 3.93×10 20 atoms/cm 2 after 1.17 years of direct space exposure on MISSE-10. The ram AO E y values for uncoated polymers range from 3.81×10 –25 cm 3 /atom for polytetrafluoroethylene (M9R-C20 F) exposed to an AO fluence of 3.44×10 20 atoms/cm 2 on MISSE-9 to 4.43×10 –23 cm 3 /atom for AO etched low density polyimide aerogel (M12R-C21 F) exposed to an AO fluence of 2.97×10 21 atoms/cm 2 on MISSE-12. Because of the low AO fluence and relatively high Si contamination, a number of PCE-3 wake samples experienced mass gain. Thus, AO E y values are not provided for these samples. Although there are calculated AO E y values for the zenith, wake and nadir samples, the ram AO E y for a particular material is a more reliable value in terms of AO exposure because the zenith, wake and nadir directions were exposed to either no or very little AO fluence and thus other space environmental factors (i.e. vacuum, thermal extremes and thermal cycling, and/or various types of radiation) are responsible for the mass loss.

Erosion yield↗
DOE OSTI2025

Estrategias de agua caliente para edificios comerciales: Una guia breve

Las calderas comerciales utilizan gas combustible o petroleo, y a veces electricidad, para producir agua caliente o vapor que se distribuye en un edificio para calefaccion de espacios y/o agua caliente sanitaria. Las calderas se encuentran en edificios de todos los tamanos, desde viviendas residenciales hasta grandes complejos comerciales y, en general, las calderas se vuelven menos eficientes y confiables con el tiempo. La vida util media de una caldera de gas es de 24 a 35 anos1 y, aunque la caldera continue funcionando, se debe planificar su reemplazo alrededor de los 15 a 20 anos de antiguedad o cuando aumentan las necesidades de mantenimiento. La lista de opciones de equipo para reemplazar calderas a gas esta creciendo, especialmente en lo que respecta a bombas de calor. Es fundamental evaluar las opciones para identificar la mejor solucion antes de su instalacion, antes de que sea necesario un reemplazo urgente. En muchos edificios existentes, el equipo se reemplaza con poca planificacion, lo que puede resultar en una operacion ineficiente, mayores costos y mantener al edificio en un ciclo de 25 anos de alto consumo energetico y emisiones. Al planificar un nuevo sistema de agua caliente, se deben considerar las emisiones de carbono, el consumo de energia, los costos y los cambios en las demandas del edificio para lograr un sistema optimo. Un enfoque colaborativo, integral e innovador puede resultar en un sistema mas limpio, energeticamente eficiente y rentable que cumpla con las necesidades de su instalacion y favorezca la disminucion de emisiones en el lugar. Este documento informativo asiste a propietarios y administradores de edificios en la planificacion del reemplazo de calderas, comprendiendo las opciones y encontrando las soluciones mas adecuadas para su situacion.

caldera↗
DOE OSTI2020

Materials Data on YCo3H2 by Materials Project

YCo3H2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent Y sites. In the first Y site, Y is bonded in a 9-coordinate geometry to nine equivalent H atoms. There are three shorter (2.42 Å) and six longer (2.48 Å) Y–H bond lengths. In the second Y site, Y is bonded in a 6-coordinate geometry to eighteen Co atoms. There are six shorter (2.85 Å) and twelve longer (3.16 Å) Y–Co bond lengths. There are three inequivalent Co sites. In the first Co site, Co is bonded in a single-bond geometry to two equivalent Y, two equivalent Co, and one H atom. There are one shorter (2.40 Å) and one longer (2.45 Å) Co–Co bond lengths. The Co–H bond length is 1.72 Å. In the second Co site, Co is bonded in a 12-coordinate geometry to three equivalent Y and six equivalent Co atoms. In the third Co site, Co is bonded in an octahedral geometry to six equivalent H atoms. All Co–H bond lengths are 1.65 Å. H is bonded to three equivalent Y and two Co atoms to form a mixture of distorted corner, edge, and face-sharing HY3Co2 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YZnGe by Materials Project

YZnGe crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Y sites. In the first Y site, Y is bonded in a 12-coordinate geometry to six equivalent Zn and six equivalent Ge atoms. All Y–Zn bond lengths are 2.94 Å. All Y–Ge bond lengths are 3.26 Å. In the second Y site, Y is bonded to six equivalent Ge atoms to form distorted edge-sharing YGe6 octahedra. All Y–Ge bond lengths are 3.04 Å. Zn is bonded in a 3-coordinate geometry to three equivalent Y and three equivalent Ge atoms. All Zn–Ge bond lengths are 2.51 Å. Ge is bonded in a 6-coordinate geometry to six Y and three equivalent Zn atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y3Ge5 by Materials Project

Y3Ge5 crystallizes in the orthorhombic Fdd2 space group. The structure is three-dimensional. there are two inequivalent Y sites. In the first Y site, Y is bonded in a 8-coordinate geometry to eight Ge atoms. There are a spread of Y–Ge bond distances ranging from 2.98–3.09 Å. In the second Y site, Y is bonded in a 10-coordinate geometry to ten Ge atoms. There are a spread of Y–Ge bond distances ranging from 2.95–3.50 Å. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a 4-coordinate geometry to five Y and two equivalent Ge atoms. There are one shorter (2.59 Å) and one longer (2.66 Å) Ge–Ge bond lengths. In the second Ge site, Ge is bonded in a 9-coordinate geometry to six Y and three Ge atoms. The Ge–Ge bond length is 2.60 Å. In the third Ge site, Ge is bonded in a 8-coordinate geometry to six Y and two equivalent Ge atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y3Ge4 by Materials Project

Y3Ge4 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Y sites. In the first Y site, Y is bonded in a 5-coordinate geometry to seven Ge atoms. There are a spread of Y–Ge bond distances ranging from 2.92–3.19 Å. In the second Y site, Y is bonded in a 8-coordinate geometry to eight Ge atoms. There are a spread of Y–Ge bond distances ranging from 3.00–3.11 Å. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to seven Y and two equivalent Ge atoms. Both Ge–Ge bond lengths are 2.62 Å. In the second Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent Y and four equivalent Ge atoms. All Ge–Ge bond lengths are 2.87 Å. In the third Ge site, Ge is bonded in a 9-coordinate geometry to six Y and three Ge atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YZnSn by Materials Project

YZnSn crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Y sites. In the first Y site, Y is bonded to six equivalent Sn atoms to form edge-sharing YSn6 octahedra. All Y–Sn bond lengths are 3.19 Å. In the second Y site, Y is bonded in a 12-coordinate geometry to six equivalent Zn and six equivalent Sn atoms. All Y–Zn bond lengths are 2.97 Å. All Y–Sn bond lengths are 3.41 Å. Zn is bonded in a 6-coordinate geometry to three equivalent Y and three equivalent Sn atoms. All Zn–Sn bond lengths are 2.71 Å. Sn is bonded in a 6-coordinate geometry to six Y and three equivalent Zn atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YCo3 by Materials Project

YCo3 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent Y sites. In the first Y site, Y is bonded in a 12-coordinate geometry to twelve Co atoms. There are a spread of Y–Co bond distances ranging from 2.88–3.10 Å. In the second Y site, Y is bonded in a 6-coordinate geometry to eighteen Co atoms. There are six shorter (2.88 Å) and twelve longer (3.18 Å) Y–Co bond lengths. There are three inequivalent Co sites. In the first Co site, Co is bonded to five Y and seven Co atoms to form a mixture of edge, face, and corner-sharing CoY5Co7 cuboctahedra. There are a spread of Co–Co bond distances ranging from 2.42–2.54 Å. In the second Co site, Co is bonded to six equivalent Y and six equivalent Co atoms to form CoY6Co6 cuboctahedra that share corners with twelve equivalent CoY5Co7 cuboctahedra, edges with six equivalent CoY6Co6 cuboctahedra, and faces with eighteen equivalent CoY5Co7 cuboctahedra. In the third Co site, Co is bonded in a 12-coordinate geometry to three equivalent Y and six equivalent Co atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y2Cl3 by Materials Project

Y2Cl3 crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of one Y2Cl3 sheet oriented in the (2, 0, -1) direction. there are two inequivalent Y sites. In the first Y site, Y is bonded in a pentagonal planar geometry to five Cl atoms. There are a spread of Y–Cl bond distances ranging from 2.72–2.84 Å. In the second Y site, Y is bonded in a 4-coordinate geometry to four Cl atoms. There are two shorter (2.76 Å) and two longer (2.79 Å) Y–Cl bond lengths. There are three inequivalent Cl sites. In the first Cl site, Cl is bonded in a distorted T-shaped geometry to three Y atoms. In the second Cl site, Cl is bonded in a distorted rectangular see-saw-like geometry to three Y atoms. In the third Cl site, Cl is bonded in a trigonal non-coplanar geometry to three equivalent Y atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YAl3Ni by Materials Project

YNiAl3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Y is bonded in a 10-coordinate geometry to two equivalent Y, two equivalent Ni, and eleven Al atoms. Both Y–Y bond lengths are 3.65 Å. Both Y–Ni bond lengths are 3.10 Å. There are a spread of Y–Al bond distances ranging from 3.03–3.64 Å. Ni is bonded in a 9-coordinate geometry to two equivalent Y and seven Al atoms. There are a spread of Ni–Al bond distances ranging from 2.36–2.50 Å. There are three inequivalent Al sites. In the first Al site, Al is bonded in a 3-coordinate geometry to three equivalent Y, three equivalent Ni, and two equivalent Al atoms. There are one shorter (2.63 Å) and one longer (2.86 Å) Al–Al bond lengths. In the second Al site, Al is bonded in a 2-coordinate geometry to four equivalent Y, two equivalent Ni, and four equivalent Al atoms. There are two shorter (2.90 Å) and two longer (2.93 Å) Al–Al bond lengths. In the third Al site, Al is bonded in a 2-coordinate geometry to four equivalent Y, two equivalent Ni, and six Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YNi3 by Materials Project

YNi3 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent Y sites. In the first Y site, Y is bonded in a 12-coordinate geometry to twelve Ni atoms. There are a spread of Y–Ni bond distances ranging from 2.85–3.10 Å. In the second Y site, Y is bonded in a distorted hexagonal planar geometry to eighteen Ni atoms. There are six shorter (2.87 Å) and twelve longer (3.18 Å) Y–Ni bond lengths. There are three inequivalent Ni sites. In the first Ni site, Ni is bonded to five Y and seven Ni atoms to form a mixture of distorted corner, edge, and face-sharing NiY5Ni7 cuboctahedra. There are a spread of Ni–Ni bond distances ranging from 2.45–2.52 Å. In the second Ni site, Ni is bonded to six equivalent Y and six equivalent Ni atoms to form NiY6Ni6 cuboctahedra that share corners with twelve equivalent NiY5Ni7 cuboctahedra, edges with six equivalent NiY6Ni6 cuboctahedra, and faces with eighteen equivalent NiY5Ni7 cuboctahedra. In the third Ni site, Ni is bonded in a 12-coordinate geometry to three equivalent Y and six equivalent Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y2FeB by Materials Project

Y2FeB crystallizes in the cubic F-43m space group. The structure is three-dimensional. there are two inequivalent Y sites. In the first Y site, Y is bonded to four equivalent Fe and six equivalent B atoms to form distorted YFe4B6 tetrahedra that share corners with eighteen YB4 tetrahedra and faces with sixteen YFe4B6 tetrahedra. All Y–Fe bond lengths are 2.79 Å. All Y–B bond lengths are 3.23 Å. In the second Y site, Y is bonded to four equivalent B atoms to form distorted YB4 tetrahedra that share corners with twenty-four YB4 tetrahedra and faces with four equivalent YFe4B6 tetrahedra. All Y–B bond lengths are 2.79 Å. Fe is bonded in a distorted body-centered cubic geometry to four equivalent Y and four equivalent B atoms. All Fe–B bond lengths are 2.79 Å. B is bonded in a 8-coordinate geometry to ten Y and four equivalent Fe atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y5CuPb3 by Materials Project

Y5CuPb3 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Y sites. In the first Y site, Y is bonded in a 7-coordinate geometry to two equivalent Cu and five equivalent Pb atoms. Both Y–Cu bond lengths are 2.82 Å. There are a spread of Y–Pb bond distances ranging from 3.08–3.61 Å. In the second Y site, Y is bonded to six equivalent Pb atoms to form a mixture of distorted corner, edge, and face-sharing YPb6 octahedra. The corner-sharing octahedral tilt angles are 35°. All Y–Pb bond lengths are 3.24 Å. Cu is bonded to six equivalent Y atoms to form face-sharing CuY6 octahedra. Pb is bonded in a 9-coordinate geometry to nine Y atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CsY10(C2I9)2 by Materials Project

CsY10(C2I9)2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Cs1+ is bonded to twelve I1- atoms to form CsI12 cuboctahedra that share corners with six YCI5 octahedra, corners with two equivalent YC2I5 pentagonal bipyramids, faces with two equivalent YCI5 octahedra, and faces with two equivalent YC2I5 pentagonal bipyramids. The corner-sharing octahedra tilt angles range from 42–45°. There are a spread of Cs–I bond distances ranging from 4.02–4.44 Å. There are five inequivalent Y3+ sites. In the first Y3+ site, Y3+ is bonded in a 7-coordinate geometry to two C+3.25- and five I1- atoms. Both Y–C bond lengths are 2.48 Å. There are a spread of Y–I bond distances ranging from 2.94–3.61 Å. In the second Y3+ site, Y3+ is bonded to one C+3.25- and five I1- atoms to form distorted YCI5 octahedra that share corners with two equivalent CsI12 cuboctahedra, edges with two YCI5 octahedra, and an edgeedge with one YC2I5 pentagonal bipyramid. The Y–C bond length is 2.23 Å. There are a spread of Y–I bond distances ranging from 3.02–3.37 Å. In the third Y3+ site, Y3+ is bonded to two C+3.25- and five I1- atoms to form distorted YC2I5 pentagonal bipyramids that share a cornercorner with one CsI12 cuboctahedra, a cornercorner with one YCI5 octahedra, edges with two YCI5 octahedra, an edgeedge with one YC2I5 pentagonal bipyramid, and a faceface with one CsI12 cuboctahedra. The corner-sharing octahedral tilt angles are 2°. Both Y–C bond lengths are 2.51 Å. There are a spread of Y–I bond distances ranging from 2.94–3.51 Å. In the fourth Y3+ site, Y3+ is bonded to one C+3.25- and five I1- atoms to form distorted YCI5 octahedra that share a cornercorner with one CsI12 cuboctahedra, a cornercorner with one YC2I5 pentagonal bipyramid, edges with two YCI5 octahedra, an edgeedge with one YC2I5 pentagonal bipyramid, and a faceface with one CsI12 cuboctahedra. The Y–C bond length is 2.22 Å. There are four shorter (3.07 Å) and one longer (3.39 Å) Y–I bond lengths. In the fifth Y3+ site, Y3+ is bonded in a 8-coordinate geometry to four C+3.25- and four I1- atoms. There are a spread of Y–C bond distances ranging from 2.64–2.67 Å. There are a spread of Y–I bond distances ranging from 3.14–3.29 Å. There are two inequivalent C+3.25- sites. In the first C+3.25- site, C+3.25- is bonded in a 6-coordinate geometry to five Y3+ and one C+3.25- atom. The C–C bond length is 1.42 Å. In the second C+3.25- site, C+3.25- is bonded in a 6-coordinate geometry to five Y3+ and one C+3.25- atom. There are nine inequivalent I1- sites. In the first I1- site, I1- is bonded in a distorted T-shaped geometry to three Y3+ atoms. In the second I1- site, I1- is bonded in a 2-coordinate geometry to one Cs1+ and two Y3+ atoms. In the third I1- site, I1- is bonded in a 4-coordinate geometry to one Cs1+ and three Y3+ atoms. In the fourth I1- site, I1- is bonded in a 2-coordinate geometry to two Y3+ atoms. In the fifth I1- site, I1- is bonded in a 4-coordinate geometry to one Cs1+ and three Y3+ atoms. In the sixth I1- site, I1- is bonded in a 3-coordinate geometry to three Y3+ atoms. In the seventh I1- site, I1- is bonded in a 4-coordinate geometry to one Cs1+ and three Y3+ atoms. In the eighth I1- site, I1- is bonded in a 3-coordinate geometry to one Cs1+ and two Y3+ atoms. In the ninth I1- site, I1- is bonded in a 4-coordinate geometry to one Cs1+ and three Y3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y5O4F7 by Materials Project

Y5O4F7 crystallizes in the monoclinic Pc space group. The structure is three-dimensional. there are five inequivalent Y3+ sites. In the first Y3+ site, Y3+ is bonded to three O2- and three F1- atoms to form a mixture of distorted edge and corner-sharing YO3F3 pentagonal pyramids. There are a spread of Y–O bond distances ranging from 2.17–2.26 Å. There are a spread of Y–F bond distances ranging from 2.23–2.46 Å. In the second Y3+ site, Y3+ is bonded to two O2- and five F1- atoms to form distorted YO2F5 pentagonal bipyramids that share corners with two equivalent YO2F5 pentagonal bipyramids, a cornercorner with one YO3F3 pentagonal pyramid, an edgeedge with one YO2F5 pentagonal bipyramid, and an edgeedge with one YO3F3 pentagonal pyramid. There are one shorter (2.29 Å) and one longer (2.40 Å) Y–O bond lengths. There are a spread of Y–F bond distances ranging from 2.23–2.32 Å. In the third Y3+ site, Y3+ is bonded to two O2- and five F1- atoms to form distorted YO2F5 pentagonal bipyramids that share corners with four YO2F5 pentagonal bipyramids, corners with two equivalent YO3F3 pentagonal pyramids, and an edgeedge with one YO2F5 pentagonal bipyramid. There are one shorter (2.18 Å) and one longer (2.29 Å) Y–O bond lengths. There are a spread of Y–F bond distances ranging from 2.23–2.67 Å. In the fourth Y3+ site, Y3+ is bonded in a 9-coordinate geometry to four O2- and five F1- atoms. There are a spread of Y–O bond distances ranging from 2.34–2.57 Å. There are a spread of Y–F bond distances ranging from 2.24–2.80 Å. In the fifth Y3+ site, Y3+ is bonded in a 6-coordinate geometry to four O2- and two F1- atoms. There are a spread of Y–O bond distances ranging from 2.17–2.58 Å. There are one shorter (2.31 Å) and one longer (2.41 Å) Y–F bond lengths. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to three Y3+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to four Y3+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to four Y3+ atoms. In the fourth O2- site, O2- is bonded in a distorted see-saw-like geometry to four Y3+ atoms. There are seven inequivalent F1- sites. In the first F1- site, F1- is bonded in a bent 120 degrees geometry to two Y3+ atoms. In the second F1- site, F1- is bonded in a water-like geometry to two Y3+ atoms. In the third F1- site, F1- is bonded in a 3-coordinate geometry to three Y3+ atoms. In the fourth F1- site, F1- is bonded in a 2-coordinate geometry to three Y3+ atoms. In the fifth F1- site, F1- is bonded in a 3-coordinate geometry to three Y3+ atoms. In the sixth F1- site, F1- is bonded in a 3-coordinate geometry to three Y3+ atoms. In the seventh F1- site, F1- is bonded in a 3-coordinate geometry to four Y3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YZr9O20 by Materials Project

YZr9O20 crystallizes in the triclinic P1 space group. The structure is three-dimensional. Y is bonded in a body-centered cubic geometry to eight O atoms. There are a spread of Y–O bond distances ranging from 2.26–2.43 Å. There are nine inequivalent Zr sites. In the first Zr site, Zr is bonded in a body-centered cubic geometry to eight O atoms. There are a spread of Zr–O bond distances ranging from 2.13–2.39 Å. In the second Zr site, Zr is bonded in a body-centered cubic geometry to eight O atoms. There are a spread of Zr–O bond distances ranging from 2.13–2.40 Å. In the third Zr site, Zr is bonded in a body-centered cubic geometry to eight O atoms. There are a spread of Zr–O bond distances ranging from 2.12–2.42 Å. In the fourth Zr site, Zr is bonded in a body-centered cubic geometry to eight O atoms. There are a spread of Zr–O bond distances ranging from 2.14–2.40 Å. In the fifth Zr site, Zr is bonded in a body-centered cubic geometry to eight O atoms. There are a spread of Zr–O bond distances ranging from 2.12–2.40 Å. In the sixth Zr site, Zr is bonded in a body-centered cubic geometry to eight O atoms. There are a spread of Zr–O bond distances ranging from 2.14–2.41 Å. In the seventh Zr site, Zr is bonded in a body-centered cubic geometry to eight O atoms. There are a spread of Zr–O bond distances ranging from 2.12–2.41 Å. In the eighth Zr site, Zr is bonded in a body-centered cubic geometry to eight O atoms. There are a spread of Zr–O bond distances ranging from 2.15–2.39 Å. In the ninth Zr site, Zr is bonded in a body-centered cubic geometry to eight O atoms. There are a spread of Zr–O bond distances ranging from 2.12–2.39 Å. There are twenty inequivalent O sites. In the first O site, O is bonded to four Zr atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the second O site, O is bonded to four Zr atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the third O site, O is bonded to four Zr atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the fourth O site, O is bonded to four Zr atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the fifth O site, O is bonded to one Y and three Zr atoms to form a mixture of corner and edge-sharing OYZr3 tetrahedra. In the sixth O site, O is bonded to four Zr atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the seventh O site, O is bonded to four Zr atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the eighth O site, O is bonded to four Zr atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the ninth O site, O is bonded to four Zr atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the tenth O site, O is bonded to one Y and three Zr atoms to form a mixture of corner and edge-sharing OYZr3 tetrahedra. In the eleventh O site, O is bonded to one Y and three Zr atoms to form a mixture of corner and edge-sharing OYZr3 tetrahedra. In the twelfth O site, O is bonded to one Y and three Zr atoms to form a mixture of corner and edge-sharing OYZr3 tetrahedra. In the thirteenth O site, O is bonded to one Y and three Zr atoms to form a mixture of corner and edge-sharing OYZr3 tetrahedra. In the fourteenth O site, O is bonded to one Y and three Zr atoms to form a mixture of corner and edge-sharing OYZr3 tetrahedra. In the fifteenth O site, O is bonded to one Y and three Zr atoms to form OYZr3 tetrahedra that share corners with sixteen OZr4 tetrahedra and edges with six OYZr3 tetrahedra. In the sixteenth O site, O is bonded to four Zr atoms to form OZr4 tetrahedra that share corners with sixteen OZr4 tetrahedra and edges with six OYZr3 tetrahedra. In the seventeenth O site, O is bonded to four Zr atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the eighteenth O site, O is bonded to four Zr atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the nineteenth O site, O is bonded to one Y and three Zr atoms to form a mixture of corner and edge-sharing OYZr3 tetrahedra. In the twentieth O site, O is bonded to four Zr atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y10U4O27 by Materials Project

U4Y10O27 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are four inequivalent U6+ sites. In the first U6+ site, U6+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of U–O bond distances ranging from 2.06–2.27 Å. In the second U6+ site, U6+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of U–O bond distances ranging from 2.10–2.42 Å. In the third U6+ site, U6+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of U–O bond distances ranging from 2.12–2.37 Å. In the fourth U6+ site, U6+ is bonded in a distorted body-centered cubic geometry to eight O2- atoms. There are a spread of U–O bond distances ranging from 2.08–2.59 Å. There are ten inequivalent Y3+ sites. In the first Y3+ site, Y3+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Y–O bond distances ranging from 2.33–2.42 Å. In the second Y3+ site, Y3+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Y–O bond distances ranging from 2.33–2.47 Å. In the third Y3+ site, Y3+ is bonded in a distorted body-centered cubic geometry to eight O2- atoms. There are a spread of Y–O bond distances ranging from 2.26–2.72 Å. In the fourth Y3+ site, Y3+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Y–O bond distances ranging from 2.32–2.63 Å. In the fifth Y3+ site, Y3+ is bonded to seven O2- atoms to form a mixture of distorted edge and corner-sharing YO7 pentagonal bipyramids. There are a spread of Y–O bond distances ranging from 2.22–2.39 Å. In the sixth Y3+ site, Y3+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Y–O bond distances ranging from 2.30–2.43 Å. In the seventh Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.22–2.46 Å. In the eighth Y3+ site, Y3+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Y–O bond distances ranging from 2.24–2.63 Å. In the ninth Y3+ site, Y3+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Y–O bond distances ranging from 2.30–2.46 Å. In the tenth Y3+ site, Y3+ is bonded to seven O2- atoms to form a mixture of distorted edge and corner-sharing YO7 hexagonal pyramids. There are a spread of Y–O bond distances ranging from 2.27–2.38 Å. There are twenty-seven inequivalent O2- sites. In the first O2- site, O2- is bonded to one U6+ and three Y3+ atoms to form distorted OY3U tetrahedra that share corners with fifteen OY3U tetrahedra and edges with six OY2U2 tetrahedra. In the second O2- site, O2- is bonded to two U6+ and two Y3+ atoms to form a mixture of edge and corner-sharing OY2U2 tetrahedra. In the third O2- site, O2- is bonded in a 4-coordinate geometry to one U6+ and three Y3+ atoms. In the fourth O2- site, O2- is bonded to four Y3+ atoms to form OY4 tetrahedra that share corners with sixteen OY2U2 tetrahedra and edges with five OY3U tetrahedra. In the fifth O2- site, O2- is bonded to one U6+ and three Y3+ atoms to form distorted OY3U tetrahedra that share corners with thirteen OY2U2 tetrahedra and edges with three OY4 tetrahedra. In the sixth O2- site, O2- is bonded to two U6+ and two Y3+ atoms to form OY2U2 tetrahedra that share corners with thirteen OY3U tetrahedra and edges with three OY2U2 tetrahedra. In the seventh O2- site, O2- is bonded to one U6+ and three Y3+ atoms to form a mixture of distorted edge and corner-sharing OY3U tetrahedra. In the eighth O2- site, O2- is bonded to one U6+ and three Y3+ atoms to form a mixture of edge and corner-sharing OY3U tetrahedra. In the ninth O2- site, O2- is bonded to two U6+ and two Y3+ atoms to form OY2U2 tetrahedra that share corners with ten OY3U tetrahedra and edges with six OY2U2 tetrahedra. In the tenth O2- site, O2- is bonded to one U6+ and three Y3+ atoms to form a mixture of edge and corner-sharing OY3U tetrahedra. In the eleventh O2- site, O2- is bonded to two U6+ and two Y3+ atoms to form a mixture of edge and corner-sharing OY2U2 tetrahedra. In the twelfth O2- site, O2- is bonded to four Y3+ atoms to form a mixture of edge and corner-sharing OY4 tetrahedra. In the thirteenth O2- site, O2- is bonded to two U6+ and two Y3+ atoms to form a mixture of distorted edge and corner-sharing OY2U2 tetrahedra. In the fourteenth O2- site, O2- is bonded to one U6+ and three Y3+ atoms to form distorted OY3U tetrahedra that share corners with thirteen OY3U tetrahedra and edges with six OY2U2 tetrahedra. In the fifteenth O2- site, O2- is bonded to four Y3+ atoms to form a mixture of edge and corner-sharing OY4 tetrahedra. In the sixteenth O2- site, O2- is bonded to one U6+ and three Y3+ atoms to form a mixture of edge and corner-sharing OY3U tetrahedra. In the seventeenth O2- site, O2- is bonded to one U6+ and three Y3+ atoms to form distorted OY3U tetrahedra that share corners with fourteen OY4 tetrahedra and edges with four OY3U tetrahedra. In the eighteenth O2- site, O2- is bonded to one U6+ and three Y3+ atoms to form a mixture of distorted edge and corner-sharing OY3U tetrahedra. In the nineteenth O2- site, O2- is bonded to one U6+ and three Y3+ atoms to form a mixture of edge and corner-sharing OY3U tetrahedra. In the twentieth O2- site, O2- is bonded to one U6+ and three Y3+ atoms to form OY3U tetrahedra that share corners with fourteen OY3U tetrahedra and edges with six OY2U2 tetrahedra. In the twenty-first O2- site, O2- is bonded to one U6+ and three Y3+ atoms to form a mixture of edge and corner-sharing OY3U tetrahedra. In the twenty-second O2- site, O2- is bonded in a 4-coordinate geometry to two U6+ and two Y3+ atoms. In the twenty-third O2- site, O2- is bonded in a 4-coordinate geometry to one U6+ and three Y3+ atoms. In the twenty-fourth O2- site, O2- is bonded to four Y3+ atoms to form a mixture of edge and corner-sharing OY4 tetrahedra. In the twenty-fifth O2- site, O2- is bonded to two U6+ and two Y3+ atoms to form a mixture of edge and corner-sharing OY2U2 tetrahedra. In the twenty-sixth O2- site, O2- is bonded to two U6+ and two Y3+ atoms to form a mixture of edge and corner-sharing OY2U2 tetrahedra. In the twenty-seventh O2- site, O2- is bonded to one U6+ and three Y3+ atoms to form a mixture of distorted edge and corner-sharing OY3U tetrahedra.

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