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Super-hydrophobic, thermally insulating, thermal-shocks resistant well cement composites for completion of geothermal wells at hydrothermal temperatures of up to 300° C

A well cement composite and a method for making a well cement composite includes a mixture of calcium aluminate cement (CAC) and fly ash cenospheres (CS) in a weight ratio of from 30:70 to 80:20 CAC to CS; sodium metasilicate (SMS) in an amount of from 1 to 10% of the total weight of the mixture of CAC and CS; polymethylhydrosiloxane (PMHS) in an amount of from 0.5 to 6.0% of the total weight of the mixture of CAC and CS; and water in a weight ratio of from 0.5:1.0 to 1.2:1.0 of water to CAC and CS.

Pyatina, Tatiana↗

Materials Data on CsB(CN)4 by Materials Project

Cs(CN)4B crystallizes in the tetragonal I4_1/a space group. The structure is three-dimensional and consists of four boron molecules and one Cs(CN)4 framework. In the Cs(CN)4 framework, Cs1+ is bonded in a 8-coordinate geometry to eight equivalent N3- atoms. There are four shorter (3.30 Å) and four longer (3.44 Å) Cs–N bond lengths. C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.17 Å. N3- is bonded in a distorted single-bond geometry to two equivalent Cs1+ and one C2+ atom.

36 MATERIALS SCIENCE↗

Materials Data on Cs4Ta2S11 by Materials Project

Cs4Ta2S11 crystallizes in the orthorhombic Pca2_1 space group. The structure is three-dimensional. there are four inequivalent Cs1+ sites. In the first Cs1+ site, Cs1+ is bonded in a 8-coordinate geometry to eight S+1.27- atoms. There are a spread of Cs–S bond distances ranging from 3.44–4.07 Å. In the second Cs1+ site, Cs1+ is bonded in a 8-coordinate geometry to eight S+1.27- atoms. There are a spread of Cs–S bond distances ranging from 3.56–3.93 Å. In the third Cs1+ site, Cs1+ is bonded in a 8-coordinate geometry to eight S+1.27- atoms. There are a spread of Cs–S bond distances ranging from 3.60–4.04 Å. In the fourth Cs1+ site, Cs1+ is bonded in a 9-coordinate geometry to nine S+1.27- atoms. There are a spread of Cs–S bond distances ranging from 3.56–3.98 Å. There are two inequivalent Ta5+ sites. In the first Ta5+ site, Ta5+ is bonded in a 7-coordinate geometry to seven S+1.27- atoms. There are a spread of Ta–S bond distances ranging from 2.26–2.84 Å. In the second Ta5+ site, Ta5+ is bonded in a 7-coordinate geometry to seven S+1.27- atoms. There are a spread of Ta–S bond distances ranging from 2.26–2.85 Å. There are eleven inequivalent S+1.27- sites. In the first S+1.27- site, S+1.27- is bonded in a 5-coordinate geometry to three Cs1+, one Ta5+, and one S+1.27- atom. The S–S bond length is 2.08 Å. In the second S+1.27- site, S+1.27- is bonded in a 1-coordinate geometry to four Cs1+, one Ta5+, and one S+1.27- atom. In the third S+1.27- site, S+1.27- is bonded in a 5-coordinate geometry to three Cs1+, one Ta5+, and one S+1.27- atom. The S–S bond length is 2.09 Å. In the fourth S+1.27- site, S+1.27- is bonded in a 1-coordinate geometry to three Cs1+, one Ta5+, and one S+1.27- atom. The S–S bond length is 2.09 Å. In the fifth S+1.27- site, S+1.27- is bonded in a 1-coordinate geometry to three Cs1+, one Ta5+, and one S+1.27- atom. In the sixth S+1.27- site, S+1.27- is bonded in a distorted L-shaped geometry to three Cs1+ and two Ta5+ atoms. In the seventh S+1.27- site, S+1.27- is bonded in a distorted single-bond geometry to three Cs1+ and one Ta5+ atom. In the eighth S+1.27- site, S+1.27- is bonded in a 1-coordinate geometry to three Cs1+, one Ta5+, and one S+1.27- atom. The S–S bond length is 2.09 Å. In the ninth S+1.27- site, S+1.27- is bonded in a distorted single-bond geometry to four Cs1+ and one Ta5+ atom. In the tenth S+1.27- site, S+1.27- is bonded in a 5-coordinate geometry to two Cs1+, two Ta5+, and one S+1.27- atom. In the eleventh S+1.27- site, S+1.27- is bonded in a 2-coordinate geometry to two Cs1+, two Ta5+, and one S+1.27- atom.

36 MATERIALS SCIENCE↗

Materials Data on Cs6K3AlSb4 by Materials Project

Cs6K3AlSb4 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Cs1+ is bonded in a 3-coordinate geometry to four equivalent Cs1+, one K1+, and five Sb3- atoms. All Cs–Cs bond lengths are 4.17 Å. The Cs–K bond length is 3.85 Å. There are a spread of Cs–Sb bond distances ranging from 4.08–4.29 Å. K1+ is bonded in a 4-coordinate geometry to two equivalent Cs1+ and four Sb3- atoms. There are two shorter (3.64 Å) and two longer (3.73 Å) K–Sb bond lengths. Al3+ is bonded in a trigonal planar geometry to three equivalent Sb3- atoms. All Al–Sb bond lengths are 2.69 Å. There are two inequivalent Sb3- sites. In the first Sb3- site, Sb3- is bonded to six equivalent Cs1+ and six equivalent K1+ atoms to form face-sharing SbCs6K6 cuboctahedra. In the second Sb3- site, Sb3- is bonded in a 1-coordinate geometry to eight equivalent Cs1+, two equivalent K1+, and one Al3+ atom.

36 MATERIALS SCIENCE↗

Materials Data on Cs4SnO4 by Materials Project

Cs4SnO4 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are four inequivalent Cs1+ sites. In the first Cs1+ site, Cs1+ is bonded to four O2- atoms to form distorted CsO4 tetrahedra that share corners with four equivalent SnO4 tetrahedra and an edgeedge with one CsO4 tetrahedra. There are a spread of Cs–O bond distances ranging from 2.92–2.99 Å. In the second Cs1+ site, Cs1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Cs–O bond distances ranging from 3.00–3.44 Å. In the third Cs1+ site, Cs1+ is bonded in a 4-coordinate geometry to five O2- atoms. There are a spread of Cs–O bond distances ranging from 2.89–3.64 Å. In the fourth Cs1+ site, Cs1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Cs–O bond distances ranging from 3.04–3.30 Å. Sn4+ is bonded to four O2- atoms to form SnO4 tetrahedra that share corners with four equivalent CsO4 tetrahedra. All Sn–O bond lengths are 2.01 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 6-coordinate geometry to five Cs1+ and one Sn4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to four Cs1+ and one Sn4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to five Cs1+ and one Sn4+ atom. In the fourth O2- site, O2- is bonded in a 6-coordinate geometry to five Cs1+ and one Sn4+ atom.

36 MATERIALS SCIENCE↗

Materials Data on Cs2In2Sb3 by Materials Project

Cs2In2Sb3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are four inequivalent Cs1+ sites. In the first Cs1+ site, Cs1+ is bonded in a 2-coordinate geometry to six Sb+2.67- atoms. There are a spread of Cs–Sb bond distances ranging from 3.71–4.33 Å. In the second Cs1+ site, Cs1+ is bonded in a 7-coordinate geometry to seven Sb+2.67- atoms. There are a spread of Cs–Sb bond distances ranging from 3.91–4.45 Å. In the third Cs1+ site, Cs1+ is bonded in a 6-coordinate geometry to six Sb+2.67- atoms. There are a spread of Cs–Sb bond distances ranging from 3.77–4.30 Å. In the fourth Cs1+ site, Cs1+ is bonded in a hexagonal planar geometry to six Sb+2.67- atoms. There are a spread of Cs–Sb bond distances ranging from 3.79–4.18 Å. There are four inequivalent In3+ sites. In the first In3+ site, In3+ is bonded to four Sb+2.67- atoms to form a mixture of edge and corner-sharing InSb4 tetrahedra. There are a spread of In–Sb bond distances ranging from 2.93–2.99 Å. In the second In3+ site, In3+ is bonded to four Sb+2.67- atoms to form a mixture of edge and corner-sharing InSb4 tetrahedra. There are a spread of In–Sb bond distances ranging from 2.89–2.94 Å. In the third In3+ site, In3+ is bonded to four Sb+2.67- atoms to form a mixture of edge and corner-sharing InSb4 tetrahedra. There are a spread of In–Sb bond distances ranging from 2.91–2.93 Å. In the fourth In3+ site, In3+ is bonded to four Sb+2.67- atoms to form a mixture of edge and corner-sharing InSb4 tetrahedra. There are a spread of In–Sb bond distances ranging from 2.88–3.03 Å. There are six inequivalent Sb+2.67- sites. In the first Sb+2.67- site, Sb+2.67- is bonded to three Cs1+ and three In3+ atoms to form distorted edge-sharing SbCs3In3 pentagonal pyramids. In the second Sb+2.67- site, Sb+2.67- is bonded in a 7-coordinate geometry to four Cs1+, two In3+, and one Sb+2.67- atom. The Sb–Sb bond length is 2.89 Å. In the third Sb+2.67- site, Sb+2.67- is bonded in a 3-coordinate geometry to five Cs1+ and three In3+ atoms. In the fourth Sb+2.67- site, Sb+2.67- is bonded in a 7-coordinate geometry to four Cs1+, two In3+, and one Sb+2.67- atom. In the fifth Sb+2.67- site, Sb+2.67- is bonded in a 3-coordinate geometry to five Cs1+ and three In3+ atoms. In the sixth Sb+2.67- site, Sb+2.67- is bonded to four Cs1+ and three In3+ atoms to form distorted SbCs4In3 pentagonal bipyramids that share an edgeedge with one SbCs4In3 pentagonal bipyramid and edges with two equivalent SbCs3In3 pentagonal pyramids.

36 MATERIALS SCIENCE↗

Materials Data on CsCd(NO2)3 by Materials Project

Cs(NO2)3Cd crystallizes in the cubic Pm-3 space group. The structure is three-dimensional and consists of one cadmium molecule and one Cs(NO2)3 framework. In the Cs(NO2)3 framework, Cs1+ is bonded to twelve equivalent O2- atoms to form edge-sharing CsO12 cuboctahedra. All Cs–O bond lengths are 3.56 Å. N3+ is bonded in a linear geometry to two equivalent O2- atoms. Both N–O bond lengths are 1.24 Å. O2- is bonded in a single-bond geometry to two equivalent Cs1+ and one N3+ atom.

36 MATERIALS SCIENCE↗

Materials Data on CsEr6CI12 by Materials Project

CsEr6CI12 crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Cs is bonded in a cuboctahedral geometry to twelve I atoms. There are six shorter (4.26 Å) and six longer (4.30 Å) Cs–I bond lengths. Er is bonded in a 6-coordinate geometry to one C and five I atoms. The Er–C bond length is 2.49 Å. There are a spread of Er–I bond distances ranging from 2.99–3.51 Å. C is bonded in an octahedral geometry to six equivalent Er atoms. There are two inequivalent I sites. In the first I site, I is bonded in a 3-coordinate geometry to one Cs and two equivalent Er atoms. In the second I site, I is bonded in a 4-coordinate geometry to one Cs and three equivalent Er atoms.

36 MATERIALS SCIENCE↗

Materials Data on CsSbClF3 by Materials Project

CsSbClF3 crystallizes in the tetragonal I-42m space group. The structure is three-dimensional. there are two inequivalent Cs1+ sites. In the first Cs1+ site, Cs1+ is bonded in a 10-coordinate geometry to four equivalent Cl1- and six F1- atoms. All Cs–Cl bond lengths are 3.73 Å. There are two shorter (3.12 Å) and four longer (3.19 Å) Cs–F bond lengths. In the second Cs1+ site, Cs1+ is bonded in a 4-coordinate geometry to four equivalent Cl1- and eight F1- atoms. All Cs–Cl bond lengths are 3.67 Å. There are four shorter (3.20 Å) and four longer (3.62 Å) Cs–F bond lengths. Sb3+ is bonded in a 5-coordinate geometry to two equivalent Cl1- and three F1- atoms. Both Sb–Cl bond lengths are 2.93 Å. There is one shorter (1.97 Å) and two longer (2.01 Å) Sb–F bond length. Cl1- is bonded to four Cs1+, two equivalent Sb3+, and two equivalent F1- atoms to form a mixture of distorted edge, face, and corner-sharing ClCs4Sb2F2 hexagonal bipyramids. Both Cl–F bond lengths are 3.23 Å. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted single-bond geometry to two Cs1+ and one Sb3+ atom. In the second F1- site, F1- is bonded in a distorted single-bond geometry to three Cs1+, one Sb3+, and two equivalent Cl1- atoms.

36 MATERIALS SCIENCE↗

Materials Data on Cs3Np(Cl2O)2 by Materials Project

Cs3NpO2Cl4 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent Cs1+ sites. In the first Cs1+ site, Cs1+ is bonded in a 8-coordinate geometry to two equivalent O2- and six Cl1- atoms. There are one shorter (3.22 Å) and one longer (3.23 Å) Cs–O bond lengths. There are a spread of Cs–Cl bond distances ranging from 3.56–3.90 Å. In the second Cs1+ site, Cs1+ is bonded in a 8-coordinate geometry to two equivalent O2- and six Cl1- atoms. Both Cs–O bond lengths are 3.12 Å. There are a spread of Cs–Cl bond distances ranging from 3.50–3.99 Å. Np5+ is bonded in a distorted linear geometry to two equivalent O2- and four Cl1- atoms. Both Np–O bond lengths are 1.85 Å. All Np–Cl bond lengths are 2.78 Å. O2- is bonded in a distorted single-bond geometry to three Cs1+ and one Np5+ atom. There are two inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a 5-coordinate geometry to four Cs1+ and one Np5+ atom. In the second Cl1- site, Cl1- is bonded in a 1-coordinate geometry to five Cs1+ and one Np5+ atom.

36 MATERIALS SCIENCE↗

Materials Data on CsH7O4 by Materials Project

Cs(H2O)2H3O2 crystallizes in the monoclinic P2_1/c space group. The structure is one-dimensional and consists of two Cs(H2O)2 ribbons oriented in the (0, 1, 0) direction and two H3O2 ribbons oriented in the (0, 1, 0) direction. In each Cs(H2O)2 ribbon, Cs1+ is bonded in a 3-coordinate geometry to three O2- atoms. There are a spread of Cs–O bond distances ranging from 3.07–3.21 Å. There are four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. In the second H1+ site, H1+ is bonded in a distorted single-bond geometry to one O2- atom. The H–O bond length is 1.01 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a water-like geometry to two equivalent Cs1+ and two H1+ atoms. In the second O2- site, O2- is bonded in a water-like geometry to one Cs1+ and two H1+ atoms. In each H3O2 ribbon, there are three inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.03 Å) and one longer (1.58 Å) H–O bond length. In the second H1+ site, H1+ is bonded in a distorted linear geometry to two O2- atoms. There is one shorter (1.03 Å) and one longer (1.60 Å) H–O bond length. In the third H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a water-like geometry to two H1+ atoms. In the second O2- site, O2- is bonded in a distorted single-bond geometry to three H1+ atoms.

36 MATERIALS SCIENCE↗

Materials Data on Cs4ZrO4 by Materials Project

Cs4ZrO4 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are four inequivalent Cs1+ sites. In the first Cs1+ site, Cs1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Cs–O bond distances ranging from 2.95–3.47 Å. In the second Cs1+ site, Cs1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Cs–O bond distances ranging from 3.05–3.28 Å. In the third Cs1+ site, Cs1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Cs–O bond distances ranging from 2.93–3.52 Å. In the fourth Cs1+ site, Cs1+ is bonded to four O2- atoms to form distorted CsO4 tetrahedra that share corners with four equivalent ZrO4 tetrahedra and edges with two equivalent CsO4 tetrahedra. There are a spread of Cs–O bond distances ranging from 2.97–3.09 Å. Zr4+ is bonded to four O2- atoms to form ZrO4 tetrahedra that share corners with four equivalent CsO4 tetrahedra. All Zr–O bond lengths are 2.01 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to five Cs1+ and one Zr4+ atom to form distorted edge-sharing OCs5Zr octahedra. In the second O2- site, O2- is bonded in a 1-coordinate geometry to five Cs1+ and one Zr4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to five Cs1+ and one Zr4+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to four Cs1+ and one Zr4+ atom.

36 MATERIALS SCIENCE↗

Materials Data on Cs2CuF6 by Materials Project

Cs2CuF6 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Cs is bonded to twelve F atoms to form CsF12 cuboctahedra that share corners with twelve equivalent CsF12 cuboctahedra, faces with six equivalent CsF12 cuboctahedra, and faces with four equivalent CuF6 octahedra. All Cs–F bond lengths are 3.24 Å. Cu is bonded to six F atoms to form CuF6 octahedra that share faces with eight equivalent CsF12 cuboctahedra. There is four shorter (1.86 Å) and two longer (1.87 Å) Cu–F bond length. There are two inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to four equivalent Cs and one Cu atom. In the second F site, F is bonded in a single-bond geometry to four equivalent Cs and one Cu atom.

36 MATERIALS SCIENCE↗

Materials Data on CsNa2Si17 by Materials Project

CsNa2Si17 crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Cs is bonded in a 12-coordinate geometry to twenty-eight Si atoms. There are a spread of Cs–Si bond distances ranging from 3.97–4.06 Å. Na is bonded in a 8-coordinate geometry to twenty Si atoms. There are a spread of Na–Si bond distances ranging from 3.21–3.39 Å. There are three inequivalent Si sites. In the first Si site, Si is bonded in a 8-coordinate geometry to one Cs, three equivalent Na, and four Si atoms. There are one shorter (2.37 Å) and three longer (2.38 Å) Si–Si bond lengths. In the second Si site, Si is bonded in a body-centered cubic geometry to four equivalent Na and four equivalent Si atoms. In the third Si site, Si is bonded in a 4-coordinate geometry to two equivalent Cs, two equivalent Na, and four Si atoms. All Si–Si bond lengths are 2.40 Å.

36 MATERIALS SCIENCE↗

Materials Data on Cs2ZnO2 by Materials Project

Cs2ZnO2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are four inequivalent Cs1+ sites. In the first Cs1+ site, Cs1+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Cs–O bond distances ranging from 2.91–3.11 Å. In the second Cs1+ site, Cs1+ is bonded to four O2- atoms to form distorted CsO4 trigonal pyramids that share a cornercorner with one ZnO4 tetrahedra, corners with two equivalent CsO4 trigonal pyramids, and an edgeedge with one ZnO4 tetrahedra. There are a spread of Cs–O bond distances ranging from 2.98–3.16 Å. In the third Cs1+ site, Cs1+ is bonded in a 4-coordinate geometry to six O2- atoms. There are a spread of Cs–O bond distances ranging from 3.07–3.68 Å. In the fourth Cs1+ site, Cs1+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Cs–O bond distances ranging from 2.95–3.12 Å. There are two inequivalent Zn2+ sites. In the first Zn2+ site, Zn2+ is bonded in a distorted trigonal planar geometry to three O2- atoms. There are a spread of Zn–O bond distances ranging from 1.87–1.98 Å. In the second Zn2+ site, Zn2+ is bonded to four O2- atoms to form distorted ZnO4 tetrahedra that share a cornercorner with one CsO4 trigonal pyramid, an edgeedge with one ZnO4 tetrahedra, and an edgeedge with one CsO4 trigonal pyramid. There are a spread of Zn–O bond distances ranging from 2.03–2.07 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to five Cs1+ and one Zn2+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to five Cs1+ and two equivalent Zn2+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to four Cs1+ and two Zn2+ atoms. In the fourth O2- site, O2- is bonded in a 6-coordinate geometry to four Cs1+ and two Zn2+ atoms.

36 MATERIALS SCIENCE↗

Materials Data on CsDyI3 by Materials Project

CsDyI3 is Orthorhombic Perovskite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Cs is bonded in a 9-coordinate geometry to nine I atoms. There are a spread of Cs–I bond distances ranging from 3.92–4.42 Å. Dy is bonded to six I atoms to form corner-sharing DyI6 octahedra. The corner-sharing octahedra tilt angles range from 12–18°. All Dy–I bond lengths are 3.06 Å. There are two inequivalent I sites. In the first I site, I is bonded in a 5-coordinate geometry to three equivalent Cs and two equivalent Dy atoms. In the second I site, I is bonded to three equivalent Cs and two equivalent Dy atoms to form a mixture of distorted edge and corner-sharing ICs3Dy2 square pyramids.

36 MATERIALS SCIENCE↗

Materials Data on CsHg(NO2)3 by Materials Project

Cs(NO2)3Hg crystallizes in the cubic Pm-3 space group. The structure is three-dimensional and consists of one mercury molecule and one Cs(NO2)3 framework. In the Cs(NO2)3 framework, Cs1+ is bonded to twelve equivalent O2- atoms to form edge-sharing CsO12 cuboctahedra. All Cs–O bond lengths are 3.59 Å. N3+ is bonded in a linear geometry to two equivalent O2- atoms. Both N–O bond lengths are 1.24 Å. O2- is bonded in a single-bond geometry to two equivalent Cs1+ and one N3+ atom.

36 MATERIALS SCIENCE↗

Materials Data on Cs6K3GaSb4 by Materials Project

Cs6K3GaSb4 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Cs1+ is bonded in a 3-coordinate geometry to four equivalent Cs1+, one K1+, and five Sb3- atoms. There are two shorter (4.15 Å) and two longer (4.17 Å) Cs–Cs bond lengths. The Cs–K bond length is 3.84 Å. There are a spread of Cs–Sb bond distances ranging from 4.08–4.27 Å. K1+ is bonded in a 4-coordinate geometry to two equivalent Cs1+ and four Sb3- atoms. There are two shorter (3.64 Å) and two longer (3.72 Å) K–Sb bond lengths. Ga3+ is bonded in a trigonal planar geometry to three equivalent Sb3- atoms. All Ga–Sb bond lengths are 2.69 Å. There are two inequivalent Sb3- sites. In the first Sb3- site, Sb3- is bonded in a 1-coordinate geometry to eight equivalent Cs1+, two equivalent K1+, and one Ga3+ atom. In the second Sb3- site, Sb3- is bonded to six equivalent Cs1+ and six equivalent K1+ atoms to form face-sharing SbCs6K6 cuboctahedra.

36 MATERIALS SCIENCE↗