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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 487 records · Page 27
All sourcesNASA NTRSDOE OSTI
NASA NTRS1975

The isotopic composition of galactic cosmic-ray lithium, beryllium, and boron

The isotopes of cosmic-ray Li, Be, and B near 100 MeV per nucleon have been measured with cosmic-ray telescopes on board the IMP-7 and IMP-8 satellites during 1973 and 1974. The measured isotopic abundances provide a stringent test for models of interstellar propagation and solar modulation. It is found that the isotopic abundances can be explained using a steady-state interstellar propagation model with a 5-g/sq cm leakage mean free path. These results, taken along with Be-10 abundance measurements, indicate a longer lifetime for cosmic rays than that predicted by the usual assumption of an average interstellar density of 1 to 3 atoms per cu cm.

Garcia-Munoz, M.↗
NASA NTRS1990

Microstructure and magnetization of doped Y-Ba-Ca-O materials prepared by melt quench and post annealing method

Y-Ba-Cu-O bulk materials prepared using the melt quench and post annealing method were shown to have very high maximum as well as remanent magnetization. Studies were carried out on materials prepared using this method which deviate from the Y:Ba:Cu = 1:2:3 stoichiometry. In one series of materials, only the stoichiometry was changed, in particular by introducing an excess of yttrium. In other cases, dopants including several rare earths were introduced. Effects of variations in composition on microstructure and phase evolution are discussed, as well as effects on the magnetic susceptibility and on the magnetization. The results show that doped materials can exhibit improvements in magnetic properties. Furthermore, the use of dopants sheds light on the role of defect sites in flux pinning.

Hojaji, H.↗
NASA NTRS1990

Yttrium enrichment and improved magnetic properties in partially melted Y-Ba-Cu-O materials

The yttrium-rich compositions in the Y-Ba-Cu-O system were mapped out in a systematic manner to quantify their magnetic properties and to correlate them with the microstructure and phase composition as determined by scanning electron microscopy and X-ray diffraction analysis. It is found that the microstructure of Y-Ba-Cu-O compositions is a sensitive function of both their composition and processing conditions. Measurements of magnetic susceptibility and maximum (low-field) and remanent magnetization for the system Y:Ba:Cu = x:2:3 show highest values for x = 2. The corresponding structures involve numerous small crystals of Y2BaCuO5 (211) embedded in highly ordered assemblages of continous YBa2Cu3O(7-y) (123) layers.

Alterescu, Sidney↗
NASA NTRS2004

Microwave Observations of Precipitation and the Atmosphere

This research effort had three elements devoted to improving satellite-derived passive microwave retrievals of precipitation rate: morphological rain-rate retrievals, warm rain retrievals, and extension of a study of geostationary satellite options. The morphological precipitation-rate retrieval method uses for the first time the morphological character of the observed storm microwave spectra. The basic concept involves: 1) retrieval of point rainfall rates using current algorithms, 2) using spatial feature vectors of the observations over segmented multi-pixel storms to estimate the integrated rainfall rate for that storm (cu m/s), and 3) normalization of the point rain-rate retrievals to ensure consistency with the storm-wide retrieval. This work is ongoing, but two key steps have been completed: development of a segmentation algorithm for defining spatial regions corresponding to single storms for purposes of estimation, and reduction of some of the data from NAST-M that will be used to support this research going forward. The warm rain retrieval method involved extension of Aquai/AIRS/AMSU/HSB algorithmic work on cloud water retrievals. The central concept involves the fact that passive microwave cloud water retrievals over approx. 0.4 mm are very likely associated with precipitation. Since glaciated precipitation is generally detected quite successfully using scattering signatures evident in the surface-blind 54- and 183-GHz bands, this new method complements the first by permitting precipitation retrievals of non-glaciated events. The method is most successful over ocean, but has detected non-glaciated convective cells over land, perhaps in their early formative stages. This work will require additional exploration and validation prior to publication. Passive microwave instrument configurations for use in geostationary orbit were studied. They employ parabolic reflectors between 2 and 4 meters in diameter, and frequencies up to approx.430 GHz; this corresponds to nadir spot diameters as small as 10 km.

Staelin, David H.↗
NASA NTRSDate not supplied

Understanding the Response of Common Spacecraft Shields to Hypervelocity Impacts of Meteorite and Other Terrestrial Analog Materials

Micrometeoroid and orbital debris (MMOD) populations can vary significantly in composition, density, and homogeneity. Hypervelocity testing campaigns intended to design and optimize MMOD shields for spacecraft are recognizing the need to investigate shield response from different types of impactors that span the range of densities observed in the MMOD population, such as nylon, Al, Al 2 O 3 , steel, and Cu. These tests, however, still pre-dominantly employ spherical and homogenous projectiles. Adding any compositional or mineralogical complexity to the impactor, such as what would be expected from a polymineralic micrometeoroid, for ex-ample, will be concomitant with a more complex shockwave structure in the projectile after it impacts the outer surface of any type of MMOD shield. The magnitude of these complexities will depend on how varied the mineralogy of the projectile is, but in the case of a metal-bearing chondrite, the disparate shock impendence between adjacent metal and silicate grains will potentially create localized areas of shock focusing (local increase in nominal shock pressure), or shock shadowing (local decrease in nominal shock pressure). The response of a MMOD shield is generally predicted using a ballistic limit equation – a semiempirical curve, derived from hypervelocity testing data, that denotes a particle diameter (for a given set of impact conditions such as projectile density and impact angle) when a shield will fail as a function of impact speed. These curves exhibit inflection points as a function of impact speed that represent when the projectile experiences sufficient pressure to fragment, melt, or vaporize. The introduction of shock focusing and shadowing in a heterogenous projectile will add uncertainty to the predicted pressures needed to go through each transition, leading to increased uncertainty in the expected performance of the MMOD shield. Therefore, it is necessary to explore the performance of MMOD shields in hypervelocity tests against more complex, natural projectile materials. To this end we have conducted a comparative test series to begin investigating the impact damage caused by meteoritic and terrestrial-analog projectiles, to that of spherical Al projectiles of similar mass.

Impact testing↗
DOE OSTI2025

Results of South-East Flux Trap Dosimetry Measurements for the Advanced Test Reactor Critical Facility in support of Advanced Sensors and Instrumentation Development

Reactor dosimetry measurements are commonly used to validate simulation and modeling in nuclear reactor tests. Numerous standard dosimeter materials exist which are commonly utilized with sensitivities to different energy ranges of neutrons. At the Advanced Test Reactor (ATR), cobalt alloy and pure nickel wires are installed every cycle to monitor thermal- and fast-neutron fluence rates. However, there is growing interest in exploring less commonly used materials which are either more sensitive to different parts of the neutron energy spectrum or which can incorporate multiple activation paths in a single material. Epithermal and fast-neutron energies beyond the typical 1-MeV threshold are of particular interest. Two ATR-C Flux Runs took place during 2024; each flux run included supplemental dosimetry packages in the South-East Flux Trap (SEFT) Filler. The focus of the dosimetry package for flux run 23-4 was to test two novel dosimetry methods that can provide simultaneous thermal and threshold (fast) sensitivity in a single dosimeter wire. A selection of 3% Au in Cu alloyed wires were available that provided sensitivity to fast and thermal neutrons through 5 different reactions. Likewise, Fe offers multiple interaction pathways with sensitivity to both thermal and fast neutrons. The main question to be answered by these irradiations was if sufficient radioactivation would take place in the ATR-C SEFT during a nominal 20-minute irradiation at typical power levels (near 600Wth) to observe the threshold reactions that have smaller activation cross-sections than the thermal reactions without being saturated by interfering interactions and Compton continuum during the High-Purity Germanium (HPGe) measurements. The results from comparing the measurement results to anticipated activity levels provide confidence in our ability to activate both traditional and novel dosimetry materials in ATR-C, however not all the measured values matched with the predicted activities. This leaves further room for investigation both on the experimental and computational approaches for future irradiation experiments.

46 - INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AN↗
DOE OSTI2020

Materials Data on Cu3(P2O7)2 by Materials Project

Cu3(P2O7)2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are four inequivalent Cu+2.67+ sites. In the first Cu+2.67+ site, Cu+2.67+ is bonded to six O2- atoms to form CuO6 octahedra that share corners with two equivalent PO4 tetrahedra, corners with two equivalent CuO5 trigonal bipyramids, and edges with two equivalent PO4 tetrahedra. There are a spread of Cu–O bond distances ranging from 1.92–2.16 Å. In the second Cu+2.67+ site, Cu+2.67+ is bonded to five O2- atoms to form CuO5 trigonal bipyramids that share corners with two CuO6 octahedra and corners with five PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 59–69°. There are a spread of Cu–O bond distances ranging from 1.95–2.04 Å. In the third Cu+2.67+ site, Cu+2.67+ is bonded to six O2- atoms to form distorted CuO6 octahedra that share corners with six PO4 tetrahedra, a cornercorner with one CuO5 trigonal bipyramid, and edges with two CuO6 octahedra. There are a spread of Cu–O bond distances ranging from 1.90–2.57 Å. In the fourth Cu+2.67+ site, Cu+2.67+ is bonded to six O2- atoms to form CuO6 octahedra that share corners with six PO4 tetrahedra and edges with two equivalent CuO6 octahedra. There are a spread of Cu–O bond distances ranging from 1.92–2.29 Å. There are four inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with four CuO6 octahedra and a cornercorner with one PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 38–59°. There are a spread of P–O bond distances ranging from 1.51–1.60 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two CuO6 octahedra, a cornercorner with one PO4 tetrahedra, and corners with two equivalent CuO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 53–71°. There are a spread of P–O bond distances ranging from 1.51–1.62 Å. In the third P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two CuO6 octahedra, a cornercorner with one PO4 tetrahedra, a cornercorner with one CuO5 trigonal bipyramid, and an edgeedge with one CuO6 octahedra. The corner-sharing octahedra tilt angles range from 36–58°. There are a spread of P–O bond distances ranging from 1.53–1.61 Å. In the fourth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two CuO6 octahedra, a cornercorner with one PO4 tetrahedra, and corners with two equivalent CuO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 54–57°. There are a spread of P–O bond distances ranging from 1.52–1.60 Å. There are fourteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Cu+2.67+ and one P5+ atom. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Cu+2.67+ and one P5+ atom. In the third O2- site, O2- is bonded in a distorted L-shaped geometry to one Cu+2.67+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a bent 150 degrees geometry to two P5+ atoms. In the fifth O2- site, O2- is bonded in a bent 150 degrees geometry to one Cu+2.67+ and one P5+ atom. In the sixth O2- site, O2- is bonded in a bent 120 degrees geometry to one Cu+2.67+ and one P5+ atom. In the seventh O2- site, O2- is bonded in a 3-coordinate geometry to two Cu+2.67+ and one P5+ atom. In the eighth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Cu+2.67+ and one P5+ atom. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to two Cu+2.67+ and one P5+ atom. In the tenth O2- site, O2- is bonded in a bent 120 degrees geometry to one Cu+2.67+ and one P5+ atom. In the eleventh O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Cu+2.67+ and one P5+ atom. In the twelfth O2- site, O2- is bonded in a 3-coordinate geometry to two Cu+2.67+ and one P5+ atom. In the thirteenth O2- site, O2- is bonded in a 2-coordinate geometry to two Cu+2.67+ and one P5+ atom. In the fourteenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two P5+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce2(CuGe)3 by Materials Project

Ce2(CuGe)3 crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. there are two inequivalent Ce sites. In the first Ce site, Ce is bonded in a 12-coordinate geometry to eight Cu and six Ge atoms. There are a spread of Ce–Cu bond distances ranging from 3.12–3.29 Å. There are four shorter (3.19 Å) and two longer (3.22 Å) Ce–Ge bond lengths. In the second Ce site, Ce is bonded in a 12-coordinate geometry to six Cu and eight Ge atoms. There are two shorter (3.18 Å) and four longer (3.26 Å) Ce–Cu bond lengths. There are four shorter (3.13 Å) and four longer (3.25 Å) Ce–Ge bond lengths. There are three inequivalent Cu sites. In the first Cu site, Cu is bonded in a 3-coordinate geometry to six Ce and three Ge atoms. There are one shorter (2.33 Å) and two longer (2.36 Å) Cu–Ge bond lengths. In the second Cu site, Cu is bonded in a 12-coordinate geometry to four Ce, two equivalent Cu, and six Ge atoms. Both Cu–Cu bond lengths are 2.50 Å. There are two shorter (2.50 Å) and four longer (2.97 Å) Cu–Ge bond lengths. In the third Cu site, Cu is bonded in a 3-coordinate geometry to four equivalent Ce, two equivalent Cu, and three Ge atoms. There are one shorter (2.39 Å) and two longer (2.40 Å) Cu–Ge bond lengths. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Ce, three Cu, and two equivalent Ge atoms. Both Ge–Ge bond lengths are 2.60 Å. In the second Ge site, Ge is bonded in a 2-coordinate geometry to four Ce, six Cu, and two equivalent Ge atoms. In the third Ge site, Ge is bonded in a 3-coordinate geometry to six Ce and three Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li2Cu2F7 by Materials Project

Li2Cu2F7 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are two inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to five F1- atoms to form distorted LiF5 square pyramids that share corners with two equivalent CuF6 octahedra, edges with two equivalent CuF6 octahedra, and edges with two equivalent LiF5 square pyramids. The corner-sharing octahedral tilt angles are 55°. There are a spread of Li–F bond distances ranging from 1.96–2.05 Å. In the second Li1+ site, Li1+ is bonded in a trigonal planar geometry to three F1- atoms. There is two shorter (1.85 Å) and one longer (1.86 Å) Li–F bond length. There are two inequivalent Cu+2.50+ sites. In the first Cu+2.50+ site, Cu+2.50+ is bonded to six F1- atoms to form CuF6 octahedra that share corners with two equivalent CuF6 octahedra, edges with two equivalent CuF6 octahedra, and edges with two equivalent LiF5 square pyramids. The corner-sharing octahedral tilt angles are 48°. There are a spread of Cu–F bond distances ranging from 1.87–2.06 Å. In the second Cu+2.50+ site, Cu+2.50+ is bonded to six F1- atoms to form CuF6 octahedra that share corners with two equivalent CuF6 octahedra, corners with two equivalent LiF5 square pyramids, and edges with two equivalent CuF6 octahedra. The corner-sharing octahedral tilt angles are 48°. There are a spread of Cu–F bond distances ranging from 1.87–2.10 Å. There are seven inequivalent F1- sites. In the first F1- site, F1- is bonded in a trigonal planar geometry to two equivalent Li1+ and one Cu+2.50+ atom. In the second F1- site, F1- is bonded in a distorted T-shaped geometry to one Li1+ and two equivalent Cu+2.50+ atoms. In the third F1- site, F1- is bonded in a 3-coordinate geometry to three Cu+2.50+ atoms. In the fourth F1- site, F1- is bonded in a 3-coordinate geometry to two equivalent Li1+ and one Cu+2.50+ atom. In the fifth F1- site, F1- is bonded in a trigonal planar geometry to two equivalent Li1+ and one Cu+2.50+ atom. In the sixth F1- site, F1- is bonded in a distorted trigonal planar geometry to one Li1+ and two equivalent Cu+2.50+ atoms. In the seventh F1- site, F1- is bonded in a water-like geometry to two equivalent Cu+2.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TlCu2P2O7 by Materials Project

Cu2TlP2O7 crystallizes in the orthorhombic Pbca space group. The structure is three-dimensional. there are two inequivalent Cu+1.50+ sites. In the first Cu+1.50+ site, Cu+1.50+ is bonded in a distorted T-shaped geometry to one Tl1+ and three O2- atoms. The Cu–Tl bond length is 3.24 Å. There are two shorter (1.85 Å) and one longer (2.57 Å) Cu–O bond lengths. In the second Cu+1.50+ site, Cu+1.50+ is bonded to five O2- atoms to form CuO5 square pyramids that share corners with five PO4 tetrahedra. There are a spread of Cu–O bond distances ranging from 1.97–2.59 Å. Tl1+ is bonded in a 3-coordinate geometry to one Cu+1.50+ and nine O2- atoms. There are a spread of Tl–O bond distances ranging from 2.76–3.57 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three equivalent CuO5 square pyramids and a cornercorner with one PO4 tetrahedra. There is three shorter (1.54 Å) and one longer (1.63 Å) P–O bond length. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent CuO5 square pyramids and a cornercorner with one PO4 tetrahedra. There is three shorter (1.54 Å) and one longer (1.62 Å) P–O bond length. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two Cu+1.50+ and one P5+ atom. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Cu+1.50+, two equivalent Tl1+, and one P5+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one Cu+1.50+, one Tl1+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a bent 120 degrees geometry to one Tl1+ and two P5+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one Cu+1.50+, one Tl1+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Cu+1.50+, three equivalent Tl1+, and one P5+ atom. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to two Cu+1.50+, one Tl1+, and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on UCuGe by Materials Project

UCuGe is hexagonal omega structure-derived structured and crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. U is bonded to six equivalent Cu and six equivalent Ge atoms to form a mixture of edge and face-sharing UCu6Ge6 cuboctahedra. All U–Cu bond lengths are 3.09 Å. All U–Ge bond lengths are 3.09 Å. Cu is bonded in a 3-coordinate geometry to six equivalent U and three equivalent Ge atoms. All Cu–Ge bond lengths are 2.39 Å. Ge is bonded in a 3-coordinate geometry to six equivalent U and three equivalent Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaCuBi by Materials Project

BaCuBi is hexagonal omega structure-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ba is bonded to six equivalent Cu and six equivalent Bi atoms to form a mixture of face and edge-sharing BaCu6Bi6 cuboctahedra. All Ba–Cu bond lengths are 3.66 Å. All Ba–Bi bond lengths are 3.66 Å. Cu is bonded in a 3-coordinate geometry to six equivalent Ba and three equivalent Bi atoms. All Cu–Bi bond lengths are 2.75 Å. Bi is bonded in a 3-coordinate geometry to six equivalent Ba and three equivalent Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on GdCuPb by Materials Project

GdCuPb is hexagonal omega structure-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Gd is bonded to six equivalent Cu and six equivalent Pb atoms to form a mixture of edge and face-sharing GdCu6Pb6 cuboctahedra. All Gd–Cu bond lengths are 3.27 Å. All Gd–Pb bond lengths are 3.27 Å. Cu is bonded in a 3-coordinate geometry to six equivalent Gd and three equivalent Pb atoms. All Cu–Pb bond lengths are 2.69 Å. Pb is bonded in a 3-coordinate geometry to six equivalent Gd and three equivalent Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LaCuPb by Materials Project

LaCuPb is hexagonal omega structure-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. La is bonded to six equivalent Cu and six equivalent Pb atoms to form a mixture of edge and face-sharing LaCu6Pb6 cuboctahedra. All La–Cu bond lengths are 3.38 Å. All La–Pb bond lengths are 3.38 Å. Cu is bonded in a 3-coordinate geometry to six equivalent La and three equivalent Pb atoms. All Cu–Pb bond lengths are 2.70 Å. Pb is bonded in a 3-coordinate geometry to six equivalent La and three equivalent Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PrCuPb by Materials Project

PrCuPb is hexagonal omega structure-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Pr is bonded to six equivalent Cu and six equivalent Pb atoms to form a mixture of edge and face-sharing PrCu6Pb6 cuboctahedra. All Pr–Cu bond lengths are 3.35 Å. All Pr–Pb bond lengths are 3.35 Å. Cu is bonded in a 3-coordinate geometry to six equivalent Pr and three equivalent Pb atoms. All Cu–Pb bond lengths are 2.69 Å. Pb is bonded in a 3-coordinate geometry to six equivalent Pr and three equivalent Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeCuGe by Materials Project

CeCuGe is hexagonal omega structure-derived structured and crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Ce is bonded to six equivalent Cu and six equivalent Ge atoms to form a mixture of edge and face-sharing CeCu6Ge6 cuboctahedra. All Ce–Cu bond lengths are 3.16 Å. All Ce–Ge bond lengths are 3.16 Å. Cu is bonded in a 3-coordinate geometry to six equivalent Ce and three equivalent Ge atoms. All Cu–Ge bond lengths are 2.43 Å. Ge is bonded in a 3-coordinate geometry to six equivalent Ce and three equivalent Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SmCuPb by Materials Project

SmCuPb is hexagonal omega structure-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Sm is bonded to six equivalent Cu and six equivalent Pb atoms to form a mixture of edge and face-sharing SmCu6Pb6 cuboctahedra. All Sm–Cu bond lengths are 3.29 Å. All Sm–Pb bond lengths are 3.29 Å. Cu is bonded in a 3-coordinate geometry to six equivalent Sm and three equivalent Pb atoms. All Cu–Pb bond lengths are 2.67 Å. Pb is bonded in a 3-coordinate geometry to six equivalent Sm and three equivalent Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PrCuGe by Materials Project

PrCuGe is hexagonal omega structure-derived structured and crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Pr is bonded to six equivalent Cu and six equivalent Ge atoms to form a mixture of edge and face-sharing PrCu6Ge6 cuboctahedra. All Pr–Cu bond lengths are 3.21 Å. All Pr–Ge bond lengths are 3.21 Å. Cu is bonded in a 3-coordinate geometry to six equivalent Pr and three equivalent Ge atoms. All Cu–Ge bond lengths are 2.45 Å. Ge is bonded in a 3-coordinate geometry to six equivalent Pr and three equivalent Cu atoms.

36 MATERIALS SCIENCE↗