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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on K3NdSi7O17 by Materials Project

K3NdSi7O17 crystallizes in the trigonal P-3 space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of K–O bond distances ranging from 2.78–3.28 Å. In the second K1+ site, K1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of K–O bond distances ranging from 2.96–3.18 Å. There are two inequivalent Nd3+ sites. In the first Nd3+ site, Nd3+ is bonded to six equivalent O2- atoms to form NdO6 octahedra that share corners with six equivalent SiO4 tetrahedra. All Nd–O bond lengths are 2.40 Å. In the second Nd3+ site, Nd3+ is bonded to six O2- atoms to form NdO6 octahedra that share corners with six SiO4 tetrahedra. There are four shorter (2.37 Å) and two longer (2.46 Å) Nd–O bond lengths. There are six inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 40°. There are a spread of Si–O bond distances ranging from 1.60–1.67 Å. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 34°. There are a spread of Si–O bond distances ranging from 1.58–1.67 Å. In the third Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 41°. There are a spread of Si–O bond distances ranging from 1.59–1.66 Å. In the fourth Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 37°. There is one shorter (1.61 Å) and three longer (1.66 Å) Si–O bond length. In the fifth Si4+ site, Si4+ is bonded to four O2- atoms to form corner-sharing SiO4 tetrahedra. There is one shorter (1.61 Å) and three longer (1.63 Å) Si–O bond length. In the sixth Si4+ site, Si4+ is bonded to four O2- atoms to form corner-sharing SiO4 tetrahedra. There is one shorter (1.61 Å) and three longer (1.62 Å) Si–O bond length. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one K1+ and two Si4+ atoms. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two equivalent K1+ and two Si4+ atoms. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one K1+ and two equivalent Si4+ atoms. In the fourth O2- site, O2- is bonded in a bent 150 degrees geometry to one K1+ and two Si4+ atoms. In the fifth O2- site, O2- is bonded in a bent 150 degrees geometry to two Si4+ atoms. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to two K1+, one Nd3+, and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to one K1+ and two Si4+ atoms. In the eighth O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent K1+, one Nd3+, and one Si4+ atom. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to two K1+, one Nd3+, and one Si4+ atom. In the tenth O2- site, O2- is bonded in a bent 120 degrees geometry to one K1+ and two Si4+ atoms. In the eleventh O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent K1+, one Nd3+, and one Si4+ atom. In the twelfth O2- site, O2- is bonded in a linear geometry to two Si4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K3Nd(Si2O5)3 by Materials Project

K3NdSi6O15 crystallizes in the orthorhombic Pbam space group. The structure is three-dimensional. there are three inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 2-coordinate geometry to two equivalent O2- atoms. Both K–O bond lengths are 2.92 Å. In the second K1+ site, K1+ is bonded in a 7-coordinate geometry to five O2- atoms. There are a spread of K–O bond distances ranging from 2.81–3.06 Å. In the third K1+ site, K1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of K–O bond distances ranging from 2.76–3.12 Å. There are two inequivalent Nd3+ sites. In the first Nd3+ site, Nd3+ is bonded to six O2- atoms to form NdO6 octahedra that share corners with six SiO4 tetrahedra. There are two shorter (2.38 Å) and four longer (2.39 Å) Nd–O bond lengths. In the second Nd3+ site, Nd3+ is bonded to six O2- atoms to form NdO6 octahedra that share corners with six SiO4 tetrahedra. There are two shorter (2.31 Å) and four longer (2.41 Å) Nd–O bond lengths. There are four inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. There are a spread of Si–O bond distances ranging from 1.60–1.66 Å. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 53°. There are a spread of Si–O bond distances ranging from 1.59–1.66 Å. In the third Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 41°. There are a spread of Si–O bond distances ranging from 1.60–1.67 Å. In the fourth Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 19°. There are a spread of Si–O bond distances ranging from 1.59–1.65 Å. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to two Si4+ atoms. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one K1+ and two Si4+ atoms. In the third O2- site, O2- is bonded in a bent 150 degrees geometry to one K1+ and two equivalent Si4+ atoms. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to two K1+, one Nd3+, and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent K1+, one Nd3+, and one Si4+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, one Nd3+, and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to one K1+ and two Si4+ atoms. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to one K1+, one Nd3+, and one Si4+ atom. In the ninth O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent Si4+ atoms. In the tenth O2- site, O2- is bonded in a bent 150 degrees geometry to two Si4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K3NdSi2O7 by Materials Project

K3NdSi2O7 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are three inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of K–O bond distances ranging from 2.84–3.10 Å. In the second K1+ site, K1+ is bonded in a 6-coordinate geometry to six equivalent O2- atoms. All K–O bond lengths are 2.80 Å. In the third K1+ site, K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are six shorter (2.98 Å) and three longer (3.10 Å) K–O bond lengths. There are two inequivalent Nd3+ sites. In the first Nd3+ site, Nd3+ is bonded to six equivalent O2- atoms to form NdO6 octahedra that share corners with six equivalent SiO4 tetrahedra. All Nd–O bond lengths are 2.35 Å. In the second Nd3+ site, Nd3+ is bonded to six equivalent O2- atoms to form distorted NdO6 pentagonal pyramids that share corners with six equivalent SiO4 tetrahedra. All Nd–O bond lengths are 2.39 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two equivalent NdO6 octahedra, a cornercorner with one NdO6 pentagonal pyramid, and a cornercorner with one SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 13°. There is three shorter (1.64 Å) and one longer (1.69 Å) Si–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three K1+, one Nd3+, and one Si4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to four K1+, one Nd3+, and one Si4+ atom. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent K1+ and two equivalent Si4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KNd9(Si3O13)2 by Materials Project

KNd9(SiO4)6O2 crystallizes in the trigonal P3 space group. The structure is three-dimensional. K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.64–2.98 Å. There are five inequivalent Nd3+ sites. In the first Nd3+ site, Nd3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Nd–O bond distances ranging from 2.29–2.72 Å. In the second Nd3+ site, Nd3+ is bonded to seven O2- atoms to form distorted NdO7 pentagonal bipyramids that share corners with two equivalent NdO7 pentagonal bipyramids, corners with four SiO4 tetrahedra, and an edgeedge with one SiO4 tetrahedra. There are a spread of Nd–O bond distances ranging from 2.31–2.59 Å. In the third Nd3+ site, Nd3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are three shorter (2.44 Å) and three longer (2.47 Å) Nd–O bond lengths. In the fourth Nd3+ site, Nd3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Nd–O bond distances ranging from 2.44–2.79 Å. In the fifth Nd3+ site, Nd3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Nd–O bond distances ranging from 2.45–2.75 Å. There are two inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two equivalent NdO7 pentagonal bipyramids. There are a spread of Si–O bond distances ranging from 1.63–1.66 Å. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two equivalent NdO7 pentagonal bipyramids and an edgeedge with one NdO7 pentagonal bipyramid. There are a spread of Si–O bond distances ranging from 1.61–1.66 Å. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three Nd3+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, two Nd3+, and one Si4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to three Nd3+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Nd3+ atoms. In the fifth O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Nd3+ atoms. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to three Nd3+ and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, two Nd3+, and one Si4+ atom. In the eighth O2- site, O2- is bonded in a 1-coordinate geometry to two Nd3+ and one Si4+ atom. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to three Nd3+ and one Si4+ atom. In the tenth O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, two Nd3+, and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K8Nd3(Si4O11)3 by Materials Project

K8Nd3(Si4O11)3 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent K sites. In the first K site, K is bonded in a 6-coordinate geometry to six O atoms. There are a spread of K–O bond distances ranging from 2.81–2.97 Å. In the second K site, K is bonded in a 6-coordinate geometry to six O atoms. There are a spread of K–O bond distances ranging from 2.79–2.99 Å. In the third K site, K is bonded in a 5-coordinate geometry to five O atoms. There are a spread of K–O bond distances ranging from 2.65–2.96 Å. In the fourth K site, K is bonded in a 4-coordinate geometry to four O atoms. There are a spread of K–O bond distances ranging from 2.71–2.86 Å. In the fifth K site, K is bonded in a 6-coordinate geometry to six O atoms. There are a spread of K–O bond distances ranging from 2.75–3.21 Å. In the sixth K site, K is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of K–O bond distances ranging from 2.59–3.30 Å. In the seventh K site, K is bonded in a distorted rectangular see-saw-like geometry to four O atoms. There are a spread of K–O bond distances ranging from 2.70–2.89 Å. In the eighth K site, K is bonded in a 5-coordinate geometry to five O atoms. There are a spread of K–O bond distances ranging from 2.62–3.02 Å. There are three inequivalent Nd sites. In the first Nd site, Nd is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Nd–O bond distances ranging from 2.32–2.48 Å. In the second Nd site, Nd is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Nd–O bond distances ranging from 2.34–2.49 Å. In the third Nd site, Nd is bonded to six O atoms to form NdO6 octahedra that share corners with six SiO4 tetrahedra. There are a spread of Nd–O bond distances ranging from 2.34–2.39 Å. There are twelve inequivalent Si sites. In the first Si site, Si is bonded to four O atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.67 Å. In the second Si site, Si is bonded to four O atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.67 Å. In the third Si site, Si is bonded to four O atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.68 Å. In the fourth Si site, Si is bonded to four O atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.62–1.69 Å. In the fifth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 37°. There are a spread of Si–O bond distances ranging from 1.60–1.66 Å. In the sixth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 40°. There are a spread of Si–O bond distances ranging from 1.60–1.66 Å. In the seventh Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. There is one shorter (1.60 Å) and three longer (1.65 Å) Si–O bond length. In the eighth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 49°. There are a spread of Si–O bond distances ranging from 1.61–1.65 Å. In the ninth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with two SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 33°. There are a spread of Si–O bond distances ranging from 1.61–1.69 Å. In the tenth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with two SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 34°. There are a spread of Si–O bond distances ranging from 1.61–1.69 Å. In the eleventh Si site, Si is bonded to four O atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.62–1.65 Å. In the twelfth Si site, Si is bonded to four O atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.66 Å. There are thirty-three inequivalent O sites. In the first O site, O is bonded in a distorted bent 150 degrees geometry to one K and two Si atoms. In the second O site, O is bonded in a distorted bent 150 degrees geometry to one K and two Si atoms. In the third O site, O is bonded in a 1-coordinate geometry to two K, one Nd, and one Si atom. In the fourth O site, O is bonded in a 1-coordinate geometry to two K, one Nd, and one Si atom. In the fifth O site, O is bonded in a 1-coordinate geometry to two K, one Nd, and one Si atom. In the sixth O site, O is bonded in a 1-coordinate geometry to two K, one Nd, and one Si atom. In the seventh O site, O is bonded in a 4-coordinate geometry to two K, one Nd, and one Si atom. In the eighth O site, O is bonded in a 4-coordinate geometry to two K, one Nd, and one Si atom. In the ninth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the tenth O site, O is bonded in a distorted bent 150 degrees geometry to two Si atoms. In the eleventh O site, O is bonded in a distorted bent 150 degrees geometry to one K and two Si atoms. In the twelfth O site, O is bonded in a distorted bent 150 degrees geometry to one K and two Si atoms. In the thirteenth O site, O is bonded in a 2-coordinate geometry to one K and two Si atoms. In the fourteenth O site, O is bonded in a 2-coordinate geometry to one K and two Si atoms. In the fifteenth O site, O is bonded in a 4-coordinate geometry to two K, one Nd, and one Si atom. In the sixteenth O site, O is bonded in a 4-coordinate geometry to two K, one Nd, and one Si atom. In the seventeenth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the eighteenth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the nineteenth O site, O is bonded in a 4-coordinate geometry to two K, one Nd, and one Si atom. In the twentieth O site, O is bonded in a distorted rectangular see-saw-like geometry to two K, one Nd, and one Si atom. In the twenty-first O site, O is bonded in a distorted bent 150 degrees geometry to one K and two Si atoms. In the twenty-second O site, O is bonded in a distorted bent 150 degrees geometry to one K and two Si atoms. In the twenty-third O site, O is bonded in a distorted bent 120 degrees geometry to two K and two Si atoms. In the twenty-fourth O site, O is bonded in a distorted bent 120 degrees geometry to two K and two Si atoms. In the twenty-fifth O site, O is bonded in a 1-coordinate geometry to two Nd and one Si atom. In the twenty-sixth O site, O is bonded in a 3-coordinate geometry to two Nd and one Si atom. In the twenty-seventh O site, O is bonded in a 4-coordinate geometry to two K, one Nd, and one Si atom. In the twenty-eighth O site, O is bonded in a distorted rectangular see-saw-like geometry to two K, one Nd, and one Si atom. In the twenty-ninth O site, O is bonded in a linear geometry to two Si atoms. In the thirtieth O site, O is bonded in a linear geometry to one K and two Si atoms. In the thirty-first O site, O is bonded in a 4-coordinate geometry to two K, one Nd, and one Si atom. In the thirty-second O site, O is bonded in a 4-coordinate geometry to two K, one Nd, and one Si atom. In the thirty-third O site, O is bonded in a T-shaped geometry to three K atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K3Nd(Si2O5)3 by Materials Project

K3NdSi6O15 crystallizes in the orthorhombic Pbam space group. The structure is three-dimensional. there are three inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of K–O bond distances ranging from 2.86–3.13 Å. In the second K1+ site, K1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of K–O bond distances ranging from 2.81–3.42 Å. In the third K1+ site, K1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of K–O bond distances ranging from 2.84–3.41 Å. There are two inequivalent Nd3+ sites. In the first Nd3+ site, Nd3+ is bonded to six O2- atoms to form NdO6 octahedra that share corners with six SiO4 tetrahedra. There are two shorter (2.34 Å) and four longer (2.38 Å) Nd–O bond lengths. In the second Nd3+ site, Nd3+ is bonded to six O2- atoms to form NdO6 octahedra that share corners with six SiO4 tetrahedra. There are two shorter (2.38 Å) and four longer (2.39 Å) Nd–O bond lengths. There are four inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 42°. There are a spread of Si–O bond distances ranging from 1.59–1.66 Å. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 15°. There are a spread of Si–O bond distances ranging from 1.59–1.66 Å. In the third Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 41°. There are a spread of Si–O bond distances ranging from 1.60–1.65 Å. In the fourth Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NdO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 50°. There are a spread of Si–O bond distances ranging from 1.60–1.66 Å. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two K1+ and two equivalent Si4+ atoms. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one K1+ and two equivalent Si4+ atoms. In the third O2- site, O2- is bonded in a bent 150 degrees geometry to two K1+ and two Si4+ atoms. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent K1+, one Nd3+, and one Si4+ atom. In the fifth O2- site, O2- is bonded in a bent 150 degrees geometry to one K1+ and two Si4+ atoms. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, one Nd3+, and one Si4+ atom. In the seventh O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one K1+ and two Si4+ atoms. In the eighth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one K1+ and two Si4+ atoms. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, one Nd3+, and one Si4+ atom. In the tenth O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, one Nd3+, and one Si4+ atom.

36 MATERIALS SCIENCE↗