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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ho12Co5Bi by Materials Project

Ho12Co5Bi crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. there are three inequivalent Ho sites. In the first Ho site, Ho is bonded in a 5-coordinate geometry to four Co and one Bi atom. There are a spread of Ho–Co bond distances ranging from 2.87–3.23 Å. The Ho–Bi bond length is 3.60 Å. In the second Ho site, Ho is bonded in a 4-coordinate geometry to three Co and one Bi atom. There are one shorter (2.67 Å) and two longer (2.84 Å) Ho–Co bond lengths. The Ho–Bi bond length is 3.43 Å. In the third Ho site, Ho is bonded in a 4-coordinate geometry to three Co and one Bi atom. There are a spread of Ho–Co bond distances ranging from 2.67–3.35 Å. The Ho–Bi bond length is 3.40 Å. There are three inequivalent Co sites. In the first Co site, Co is bonded in a 9-coordinate geometry to eight Ho and one Co atom. The Co–Co bond length is 2.34 Å. In the second Co site, Co is bonded in a 2-coordinate geometry to eight Ho and one Co atom. The Co–Co bond length is 2.21 Å. In the third Co site, Co is bonded in a distorted body-centered cubic geometry to eight Ho atoms. Bi is bonded in a cuboctahedral geometry to twelve Ho atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho6Co2Sn by Materials Project

Ho6Co2Sn crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. there are three inequivalent Ho sites. In the first Ho site, Ho is bonded in a 4-coordinate geometry to two Co and two Sn atoms. There are one shorter (2.71 Å) and one longer (3.15 Å) Ho–Co bond lengths. There are one shorter (3.07 Å) and one longer (3.31 Å) Ho–Sn bond lengths. In the second Ho site, Ho is bonded in a 5-coordinate geometry to three Co and two Sn atoms. There are two shorter (2.90 Å) and one longer (3.13 Å) Ho–Co bond lengths. There are one shorter (3.20 Å) and one longer (3.62 Å) Ho–Sn bond lengths. In the third Ho site, Ho is bonded in a 4-coordinate geometry to three Co and one Sn atom. There are one shorter (2.72 Å) and two longer (2.85 Å) Ho–Co bond lengths. The Ho–Sn bond length is 3.39 Å. There are two inequivalent Co sites. In the first Co site, Co is bonded in a 2-coordinate geometry to eight Ho and one Co atom. The Co–Co bond length is 2.72 Å. In the second Co site, Co is bonded in a 9-coordinate geometry to eight Ho and one Co atom. The Co–Co bond length is 2.24 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a cuboctahedral geometry to twelve Ho atoms. In the second Sn site, Sn is bonded in a body-centered cubic geometry to eight Ho atoms.

36 MATERIALS SCIENCE↗
NASA NTRS2000

High Energy Directly Pumped Ho:YLF Laser

The most commonly used crystal architecture to produce 2 micrometer laser is co-doping Ho and Tm into a single host crystal. In this method, the stored energy transfer from the Tm (3)F4 to the Ho (5)I7 manifold is not fast enough to warrant high efficiency for short pulse applications. By separating the Ho and the Tm ions and doping the Tm in YALO3 and the Ho in YLF, we were able to directly pump the Ho (5)I7 manifold with 1.94 micrometers. The Ho:YLF laser has produced 33 mJ at 2.062 micrometers with a quantum efficiency of 0.88. The performance of each laser will be presented.

Petros, Mulugeta↗
DOE OSTI2020

Materials Data on Ho2Co12Ni5 by Materials Project

Ho2Co12Ni5 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a 12-coordinate geometry to eighteen Co atoms. There are a spread of Ho–Co bond distances ranging from 2.94–3.20 Å. In the second Ho site, Ho is bonded in a 2-coordinate geometry to twelve Co and eight Ni atoms. There are six shorter (3.01 Å) and six longer (3.05 Å) Ho–Co bond lengths. There are two shorter (2.80 Å) and six longer (3.12 Å) Ho–Ni bond lengths. There are two inequivalent Co sites. In the first Co site, Co is bonded to two Ho, six Co, and four Ni atoms to form distorted CoHo2Co6Ni4 cuboctahedra that share corners with four equivalent NiHo2Co8Ni2 cuboctahedra, corners with twenty CoHo2Co6Ni4 cuboctahedra, edges with two equivalent NiHo2Co8Ni2 cuboctahedra, edges with three CoHo3Co6Ni3 cuboctahedra, faces with four equivalent NiHo2Co8Ni2 cuboctahedra, and faces with seventeen CoHo2Co6Ni4 cuboctahedra. There are a spread of Co–Co bond distances ranging from 2.30–2.53 Å. There are two shorter (2.38 Å) and two longer (2.67 Å) Co–Ni bond lengths. In the second Co site, Co is bonded to three Ho, six Co, and three Ni atoms to form distorted CoHo3Co6Ni3 cuboctahedra that share corners with five equivalent NiHo2Co8Ni2 cuboctahedra, corners with eighteen CoHo3Co6Ni3 cuboctahedra, edges with three equivalent NiHo2Co8Ni2 cuboctahedra, edges with seven CoHo3Co6Ni3 cuboctahedra, faces with two equivalent NiHo2Co8Ni2 cuboctahedra, and faces with eighteen CoHo2Co6Ni4 cuboctahedra. Both Co–Co bond lengths are 2.36 Å. There are two shorter (2.43 Å) and one longer (2.65 Å) Co–Ni bond lengths. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded to two equivalent Ho, eight Co, and two equivalent Ni atoms to form NiHo2Co8Ni2 cuboctahedra that share corners with four equivalent NiHo2Co8Ni2 cuboctahedra, corners with eighteen CoHo3Co6Ni3 cuboctahedra, edges with ten CoHo3Co6Ni3 cuboctahedra, faces with six equivalent NiHo2Co8Ni2 cuboctahedra, and faces with twelve CoHo2Co6Ni4 cuboctahedra. Both Ni–Ni bond lengths are 2.52 Å. In the second Ni site, Ni is bonded in a 1-coordinate geometry to one Ho, nine Co, and four Ni atoms. The Ni–Ni bond length is 2.42 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho7In(CoGe3)4 by Materials Project

Ho7In(CoGe3)4 crystallizes in the tetragonal P4/m space group. The structure is three-dimensional. there are three inequivalent Ho sites. In the first Ho site, Ho is bonded in a 11-coordinate geometry to two equivalent Co, two equivalent In, and seven Ge atoms. Both Ho–Co bond lengths are 3.03 Å. Both Ho–In bond lengths are 3.32 Å. There are a spread of Ho–Ge bond distances ranging from 2.94–3.08 Å. In the second Ho site, Ho is bonded in a 8-coordinate geometry to four equivalent Co and twelve Ge atoms. All Ho–Co bond lengths are 3.14 Å. There are eight shorter (2.98 Å) and four longer (3.18 Å) Ho–Ge bond lengths. In the third Ho site, Ho is bonded in a 4-coordinate geometry to four equivalent Co and ten Ge atoms. All Ho–Co bond lengths are 3.34 Å. There are a spread of Ho–Ge bond distances ranging from 3.04–3.27 Å. Co is bonded in a 5-coordinate geometry to five Ho and five Ge atoms. There are a spread of Co–Ge bond distances ranging from 2.33–2.45 Å. In is bonded to eight equivalent Ho and four equivalent Ge atoms to form face-sharing InHo8Ge4 cuboctahedra. All In–Ge bond lengths are 2.99 Å. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to six Ho, one Co, one In, and one Ge atom. The Ge–Ge bond length is 2.59 Å. In the second Ge site, Ge is bonded in a 2-coordinate geometry to four Ho, two equivalent Co, and two equivalent Ge atoms. Both Ge–Ge bond lengths are 2.94 Å. In the third Ge site, Ge is bonded in a 10-coordinate geometry to five Ho, two equivalent Co, and three Ge atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho2Fe5Co12 by Materials Project

Ho2Fe5Co12 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a 12-coordinate geometry to eighteen Co atoms. There are a spread of Ho–Co bond distances ranging from 2.94–3.22 Å. In the second Ho site, Ho is bonded in a 8-coordinate geometry to eight Fe and twelve Co atoms. There are two shorter (2.89 Å) and six longer (3.15 Å) Ho–Fe bond lengths. There are six shorter (3.02 Å) and six longer (3.09 Å) Ho–Co bond lengths. There are two inequivalent Fe sites. In the first Fe site, Fe is bonded in a 2-coordinate geometry to one Ho, four Fe, and nine Co atoms. There are one shorter (2.33 Å) and three longer (2.56 Å) Fe–Fe bond lengths. There are three shorter (2.65 Å) and six longer (2.70 Å) Fe–Co bond lengths. In the second Fe site, Fe is bonded to two equivalent Ho, two equivalent Fe, and eight Co atoms to form distorted FeHo2Fe2Co8 cuboctahedra that share corners with four equivalent FeHo2Fe2Co8 cuboctahedra, corners with eighteen CoHo3Fe3Co6 cuboctahedra, edges with ten CoHo3Fe3Co6 cuboctahedra, faces with six equivalent FeHo2Fe2Co8 cuboctahedra, and faces with twelve CoHo2Fe4Co6 cuboctahedra. There are four shorter (2.41 Å) and four longer (2.44 Å) Fe–Co bond lengths. There are two inequivalent Co sites. In the first Co site, Co is bonded to two Ho, four Fe, and six Co atoms to form distorted CoHo2Fe4Co6 cuboctahedra that share corners with four equivalent FeHo2Fe2Co8 cuboctahedra, corners with twenty CoHo2Fe4Co6 cuboctahedra, edges with two equivalent FeHo2Fe2Co8 cuboctahedra, edges with three CoHo3Fe3Co6 cuboctahedra, faces with four equivalent FeHo2Fe2Co8 cuboctahedra, and faces with seventeen CoHo2Fe4Co6 cuboctahedra. There are a spread of Co–Co bond distances ranging from 2.35–2.57 Å. In the second Co site, Co is bonded to three Ho, three Fe, and six Co atoms to form distorted CoHo3Fe3Co6 cuboctahedra that share corners with five equivalent FeHo2Fe2Co8 cuboctahedra, corners with eighteen CoHo3Fe3Co6 cuboctahedra, edges with three equivalent FeHo2Fe2Co8 cuboctahedra, edges with seven CoHo3Fe3Co6 cuboctahedra, faces with two equivalent FeHo2Fe2Co8 cuboctahedra, and faces with eighteen CoHo2Fe4Co6 cuboctahedra. Both Co–Co bond lengths are 2.39 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2021

A kinetic evaluation on NO 2 formation in the post-flame region of pressurized oxy-combustion process

Pressurized oxy-combustion is a promising technology that can significantly re-duce the energy penalty associated with first generation oxy-combustion for CO 2 capture in coal-fired power plants. However, higher pressure enhances the production of strong acid gases, including NO 2 and SO 3 , aggravating the corrosion threat during flue gas re-circulation. In the flame region, high temperature NO x exists mainly as NO, while conversion from NO to NO 2 happened in post-flame region. In this study, the conversion of NO → NO 2 has been kinetically evaluated under representative post-flame conditions of pressurized oxy-combustion after validating the mechanism (80 species and 464 reactions), which includes nitrogen and sulfur chemistry based on GRI-MECH 3.0. The effects of residence time, temperature, pressure, major species (O 2 /H 2 O), and minor or trace species (CO/SO x ) on NO 2 formation are studied. The calculation results show that when pressure is increased from 1 to 15 bar, NO 2 is increased from 1 to 60 ppm, and the acid dew point increases by over 80°C. Higher pressure and temperature greatly reduce the time required to reach equilibrium. With increasing pressure and decreasing temperature, O plays a much more important role than HO 2 in the oxidation of NO. A higher water vapor content accelerates NO 2 formation in all cases by providing more O and HO 2 radicals. The addition of CO or SO 2 also promotes the formation of NO 2 . The NO 2 formation in a pressurized oxy-combustion furnace can be over 10 times that of an atmospheric air-combustion furnace.

01 COAL, LIGNITE, AND PEAT↗
DOE OSTI2020

Materials Data on Ho2CoGe2 by Materials Project

Ho2CoGe2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a 6-coordinate geometry to two equivalent Co and six Ge atoms. Both Ho–Co bond lengths are 3.16 Å. There are a spread of Ho–Ge bond distances ranging from 2.90–3.08 Å. In the second Ho site, Ho is bonded in a 2-coordinate geometry to four equivalent Co and seven Ge atoms. There are a spread of Ho–Co bond distances ranging from 3.02–3.08 Å. There are a spread of Ho–Ge bond distances ranging from 2.91–3.22 Å. Co is bonded in a 10-coordinate geometry to six Ho and four Ge atoms. There are a spread of Co–Ge bond distances ranging from 2.39–2.54 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to seven Ho, one Co, and one Ge atom. The Ge–Ge bond length is 2.68 Å. In the second Ge site, Ge is bonded in a 10-coordinate geometry to six Ho, three equivalent Co, and one Ge atom. The Ge–Ge bond length is 2.82 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Recent advances in polymeric facilitated transport membranes for carbon dioxide separation and hydrogen purification

Membrane and membrane process have been widely considered as one of the best candidates for mitigating CO 2 emissions from the combustion or utilization of fossil fuels. Various amine-containing polymers constitute an important class of membranes, where the highly selective CO 2 transport is achieved by the facilitated transport mechanism. In this review, the amine–CO 2 chemistry is discussed in conjunction with the mechanism of the reaction-mediated CO 2 transport. A wide variety of amine-containing polymers are discussed based on two synthesis motifs: (a) polyamines with amino groups covalently bound to the polymer backbone and (b) small molecule amines embedded in a polymer matrix. This review concludes with the remarks on the facilitated transport membranes for post-combustion carbon capture (CO 2 /N 2 ) and hydrogen purification (CO 2 /H 2 ).

42 ENGINEERING↗
DOE OSTI2020

Materials Data on Ho3Co4Ge13 by Materials Project

Ho3Co4Ge13 crystallizes in the cubic Pm-3n space group. The structure is three-dimensional. Ho is bonded in a 12-coordinate geometry to four equivalent Co and twelve equivalent Ge atoms. All Ho–Co bond lengths are 3.11 Å. There are four shorter (3.09 Å) and eight longer (3.10 Å) Ho–Ge bond lengths. Co is bonded in a 6-coordinate geometry to three equivalent Ho and six equivalent Ge atoms. All Co–Ge bond lengths are 2.41 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 2-coordinate geometry to three equivalent Ho, two equivalent Co, and four Ge atoms. There are a spread of Ge–Ge bond distances ranging from 2.71–3.01 Å. In the second Ge site, Ge is bonded in a cuboctahedral geometry to twelve equivalent Ge atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Hydrophobic Nanoconfinement Enhances CO 2 Conversion to H 2 CO 3

Understanding the formation of H 2 CO 3 in water from CO 2 is important in environmental and industrial processes. Although numerous investigations have studied this reaction, the conversion of CO 2 to H 2 CO 3 in nanopores, and how it differs from that in bulk water, has not been understood. We use ReaxFF metadynamics molecular simulations to demonstrate striking differences in the free energy of CO 2 conversion to H 2 CO 3 in bulk and nanoconfined aqueous environments. We find that nanoconfinement not only reduces the energy barrier but also reverses the reaction from endothermic in bulk water to exothermic in nanoconfined water. Also, charged intermediates are observed more often under nanoconfinement than in bulk water. Stronger solvation and more favorable proton transfer with increasing nanoconfinement enhance the thermodynamics and kinetics of the reaction. Here our results provide a detailed mechanistic understanding of an important step in the carbonation process, which depends intricately on confinement, surface chemistry, and CO 2 concentration.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2020

Materials Data on Ho5CoSb2 by Materials Project

Ho5CoSb2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are four inequivalent Ho sites. In the first Ho site, Ho is bonded to one Co and four equivalent Sb atoms to form a mixture of distorted corner, edge, and face-sharing HoCoSb4 trigonal bipyramids. The Ho–Co bond length is 2.69 Å. All Ho–Sb bond lengths are 3.14 Å. In the second Ho site, Ho is bonded to one Co and four equivalent Sb atoms to form a mixture of distorted corner, edge, and face-sharing HoCoSb4 trigonal bipyramids. The Ho–Co bond length is 2.99 Å. All Ho–Sb bond lengths are 3.10 Å. In the third Ho site, Ho is bonded to one Co and four equivalent Sb atoms to form a mixture of distorted corner and edge-sharing HoCoSb4 trigonal bipyramids. The Ho–Co bond length is 2.69 Å. There are two shorter (3.17 Å) and two longer (3.22 Å) Ho–Sb bond lengths. In the fourth Ho site, Ho is bonded in a 2-coordinate geometry to two equivalent Co and three equivalent Sb atoms. There are one shorter (2.74 Å) and one longer (2.84 Å) Ho–Co bond lengths. There are a spread of Ho–Sb bond distances ranging from 3.30–3.52 Å. Co is bonded to seven Ho atoms to form distorted edge-sharing CoHo7 pentagonal bipyramids. Sb is bonded in a 9-coordinate geometry to nine Ho atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho5CoBi2 by Materials Project

Ho5CoBi2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are four inequivalent Ho sites. In the first Ho site, Ho is bonded to one Co and four equivalent Bi atoms to form a mixture of distorted corner, edge, and face-sharing HoCoBi4 trigonal bipyramids. The Ho–Co bond length is 2.69 Å. All Ho–Bi bond lengths are 3.20 Å. In the second Ho site, Ho is bonded in a 5-coordinate geometry to one Co and four equivalent Bi atoms. The Ho–Co bond length is 2.66 Å. There are two shorter (3.24 Å) and two longer (3.28 Å) Ho–Bi bond lengths. In the third Ho site, Ho is bonded in a 2-coordinate geometry to two equivalent Co and three equivalent Bi atoms. There are one shorter (2.80 Å) and one longer (2.85 Å) Ho–Co bond lengths. There are a spread of Ho–Bi bond distances ranging from 3.36–3.53 Å. In the fourth Ho site, Ho is bonded to one Co and four equivalent Bi atoms to form a mixture of distorted corner, edge, and face-sharing HoCoBi4 trigonal bipyramids. The Ho–Co bond length is 2.98 Å. There are two shorter (3.15 Å) and two longer (3.19 Å) Ho–Bi bond lengths. Co is bonded to seven Ho atoms to form distorted edge-sharing CoHo7 pentagonal bipyramids. Bi is bonded in a 9-coordinate geometry to nine Ho atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaHo(CoO3)2 by Materials Project

BaHo(CoO3)2 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Ba2+ is bonded to twelve O2- atoms to form BaO12 cuboctahedra that share corners with four equivalent BaO12 cuboctahedra, corners with eight equivalent HoO12 cuboctahedra, faces with two equivalent HoO12 cuboctahedra, faces with four equivalent BaO12 cuboctahedra, and faces with eight equivalent CoO6 octahedra. There are four shorter (2.70 Å) and eight longer (2.97 Å) Ba–O bond lengths. Ho3+ is bonded to twelve O2- atoms to form HoO12 cuboctahedra that share corners with four equivalent HoO12 cuboctahedra, corners with eight equivalent BaO12 cuboctahedra, faces with two equivalent BaO12 cuboctahedra, faces with four equivalent HoO12 cuboctahedra, and faces with eight equivalent CoO6 octahedra. There are eight shorter (2.53 Å) and four longer (2.70 Å) Ho–O bond lengths. Co+3.50+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with six equivalent CoO6 octahedra, faces with four equivalent BaO12 cuboctahedra, and faces with four equivalent HoO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 0–15°. There are a spread of Co–O bond distances ranging from 1.92–2.01 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to four equivalent Ho3+ and two equivalent Co+3.50+ atoms. In the second O2- site, O2- is bonded to four equivalent Ba2+ and two equivalent Co+3.50+ atoms to form a mixture of edge and corner-sharing OBa4Co2 octahedra. The corner-sharing octahedral tilt angles are 0°. In the third O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ba2+, two equivalent Ho3+, and two equivalent Co+3.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho(CoB)2 by Materials Project

HoCo2B2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ho3+ is bonded in a body-centered cubic geometry to eight equivalent B3- atoms. All Ho–B bond lengths are 2.87 Å. Co+1.50+ is bonded to four equivalent B3- atoms to form a mixture of edge and corner-sharing CoB4 tetrahedra. All Co–B bond lengths are 2.01 Å. B3- is bonded in a 4-coordinate geometry to four equivalent Ho3+ and four equivalent Co+1.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho3Co by Materials Project

Ho3Co is Cementite structured and crystallizes in the orthorhombic Pnma space group. The structure is two-dimensional and consists of two Ho3Co sheets oriented in the (0, 0, 1) direction. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a 2-coordinate geometry to two equivalent Co atoms. There are one shorter (2.73 Å) and one longer (2.82 Å) Ho–Co bond lengths. In the second Ho site, Ho is bonded in a distorted bent 150 degrees geometry to two equivalent Co atoms. There are one shorter (2.67 Å) and one longer (2.75 Å) Ho–Co bond lengths. Co is bonded in a 6-coordinate geometry to six Ho atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Control of the Structural Charge Distribution and Hydration State upon Intercalation of CO 2 into Expansive Clay Interlayers

Numerous experimental investigations indicated that expansive clays such as montmorillonite can intercalate CO 2 preferentially into their interlayers and therefore potentially act as a material for CO 2 separation, capture, and storage. However, an understanding of the energy–structure relationship during the intercalation of CO 2 into clay interlayers remains elusive. Here, in this study, we use metadynamics molecular dynamics simulations to elucidate the energy landscape associated with CO 2 intercalation. Our free energy calculations indicate that CO 2 favorably partitions into nanoconfined water in clay interlayers from a gas phase, leading to an increase in the CO 2 /H 2 O ratio in clay interlayers as compared to that in bulk water. CO 2 molecules prefer to be located at the centers of charge-neutral hydrophobic siloxane rings, whereas interlayer spaces close to structural charges tend to avoid CO 2 intercalation. The structural charge distribution significantly affects the amount of CO 2 intercalated in the interlayers. These results provide a mechanistic understanding of CO 2 intercalation in clays for CO 2 separation, capture, and storage.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2020

Materials Data on Ho7Co6Sn23 by Materials Project

Ho7Co6Sn23 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a 12-coordinate geometry to six equivalent Co and twelve Sn atoms. All Ho–Co bond lengths are 3.44 Å. All Ho–Sn bond lengths are 3.36 Å. In the second Ho site, Ho is bonded in a 12-coordinate geometry to two equivalent Co and ten Sn atoms. Both Ho–Co bond lengths are 3.18 Å. There are a spread of Ho–Sn bond distances ranging from 3.09–3.41 Å. Co is bonded in a 9-coordinate geometry to three Ho and six Sn atoms. There are a spread of Co–Sn bond distances ranging from 2.59–2.79 Å. There are six inequivalent Sn sites. In the first Sn site, Sn is bonded in a 6-coordinate geometry to six equivalent Sn atoms. All Sn–Sn bond lengths are 2.99 Å. In the second Sn site, Sn is bonded in a 3-coordinate geometry to three equivalent Ho, three equivalent Co, and one Sn atom. The Sn–Sn bond length is 2.94 Å. In the third Sn site, Sn is bonded in a 4-coordinate geometry to three equivalent Ho and one Sn atom. In the fourth Sn site, Sn is bonded in a 2-coordinate geometry to three Ho and two equivalent Co atoms. In the fifth Sn site, Sn is bonded in a 5-coordinate geometry to four equivalent Ho, one Co, and one Sn atom. The Sn–Sn bond length is 3.20 Å. In the sixth Sn site, Sn is bonded in a 7-coordinate geometry to three Ho, two equivalent Co, and two Sn atoms.

36 MATERIALS SCIENCE↗