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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on K2ZnP2O7 by Materials Project

K2ZnP2O7 crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded to eight O2- atoms to form distorted KO8 hexagonal bipyramids that share corners with two equivalent PO4 tetrahedra, corners with four equivalent ZnO4 tetrahedra, an edgeedge with one KO8 hexagonal bipyramid, and edges with four equivalent PO4 tetrahedra. There are a spread of K–O bond distances ranging from 2.66–2.95 Å. In the second K1+ site, K1+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are four shorter (2.86 Å) and four longer (2.87 Å) K–O bond lengths. Zn2+ is bonded to four equivalent O2- atoms to form ZnO4 tetrahedra that share corners with four equivalent KO8 hexagonal bipyramids and corners with four equivalent PO4 tetrahedra. All Zn–O bond lengths are 1.99 Å. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one KO8 hexagonal bipyramid, a cornercorner with one PO4 tetrahedra, corners with two equivalent ZnO4 tetrahedra, and edges with two equivalent KO8 hexagonal bipyramids. There are a spread of P–O bond distances ranging from 1.51–1.65 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to three K1+ and one P5+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent K1+ and two equivalent P5+ atoms. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two K1+, one Zn2+, and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KZnPO4 by Materials Project

KZnPO4 crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. K1+ is bonded in a 3-coordinate geometry to three O2- atoms. There are a spread of K–O bond distances ranging from 2.74–2.81 Å. Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share corners with four equivalent PO4 tetrahedra. There is three shorter (1.96 Å) and one longer (1.97 Å) Zn–O bond length. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with four equivalent ZnO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.54–1.57 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Zn2+, and one P5+ atom. In the second O2- site, O2- is bonded in a distorted linear geometry to one Zn2+ and one P5+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Zn2+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Zn2+, and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KZn4(PO4)3 by Materials Project

KZn4(PO4)3 crystallizes in the orthorhombic Pccn space group. The structure is three-dimensional. K1+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of K–O bond distances ranging from 2.83–3.09 Å. There are two inequivalent Zn2+ sites. In the first Zn2+ site, Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share corners with two equivalent ZnO4 tetrahedra and corners with four PO4 tetrahedra. There are a spread of Zn–O bond distances ranging from 1.91–2.06 Å. In the second Zn2+ site, Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share corners with two equivalent ZnO4 tetrahedra and corners with four PO4 tetrahedra. There are a spread of Zn–O bond distances ranging from 1.93–2.02 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 five ZnO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.53–1.60 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with six ZnO4 tetrahedra. There is two shorter (1.54 Å) and two longer (1.58 Å) P–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Zn2+, and one P5+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Zn2+, and one P5+ atom. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two equivalent K1+, one Zn2+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a trigonal planar geometry to two Zn2+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Zn2+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a trigonal planar geometry to two Zn2+ and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2Zn3(P2O7)2 by Materials Project

K2Zn3(P2O7)2 crystallizes in the orthorhombic P2_12_12_1 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 2.79–3.17 Å. In the second 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 2.75–3.13 Å. There are three inequivalent Zn2+ sites. In the first Zn2+ site, Zn2+ is bonded to four O2- atoms to form distorted ZnO4 tetrahedra that share corners with four PO4 tetrahedra. There are a spread of Zn–O bond distances ranging from 1.96–1.99 Å. In the second Zn2+ site, Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share corners with four PO4 tetrahedra. There are a spread of Zn–O bond distances ranging from 1.95–1.99 Å. In the third Zn2+ site, Zn2+ is bonded to four O2- atoms to form ZnO4 tetrahedra that share corners with four PO4 tetrahedra. There are a spread of Zn–O bond distances ranging from 1.94–1.96 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 a cornercorner with one PO4 tetrahedra and corners with three ZnO4 tetrahedra. There is three shorter (1.53 Å) and one longer (1.64 Å) P–O bond length. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one PO4 tetrahedra and corners with three ZnO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.52–1.64 Å. In the third P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one PO4 tetrahedra and corners with three ZnO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.53–1.63 Å. In the fourth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one PO4 tetrahedra and corners with three ZnO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.53–1.63 Å. There are fourteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Zn2+, and one P5+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to two K1+, one Zn2+, and one P5+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Zn2+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one K1+ and two P5+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Zn2+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to one K1+, one Zn2+, and one P5+ atom. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to one K1+ and two P5+ atoms. In the eighth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Zn2+ and one P5+ atom. In the ninth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one K1+, one Zn2+, and one P5+ atom. In the tenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one K1+, one Zn2+, and one P5+ atom. In the eleventh O2- site, O2- is bonded in a 2-coordinate geometry to two K1+, one Zn2+, and one P5+ atom. In the twelfth O2- site, O2- is bonded in a 2-coordinate geometry to two K1+, one Zn2+, and one P5+ atom. In the thirteenth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one K1+, one Zn2+, and one P5+ atom. In the fourteenth O2- site, O2- is bonded in a 3-coordinate geometry to one K1+, one Zn2+, and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KZnP2O7 by Materials Project

KZnP2O7 crystallizes in the orthorhombic Pmc2_1 space group. The structure is three-dimensional. there are two inequivalent K sites. In the first K site, K is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of K–O bond distances ranging from 2.93–3.17 Å. In the second K site, K is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of K–O bond distances ranging from 2.76–3.26 Å. Zn is bonded to four O atoms to form ZnO4 tetrahedra that share corners with four PO4 tetrahedra. There are a spread of Zn–O bond distances ranging from 1.95–1.97 Å. There are two inequivalent P sites. In the first P site, P is bonded to four O atoms to form PO4 tetrahedra that share a cornercorner with one PO4 tetrahedra and corners with two equivalent ZnO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.52–1.64 Å. In the second P site, P is bonded to four O atoms to form PO4 tetrahedra that share a cornercorner with one PO4 tetrahedra and corners with two equivalent ZnO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.52–1.64 Å. There are eight inequivalent O sites. In the first O site, O is bonded in a distorted bent 120 degrees geometry to one K and two equivalent P atoms. In the second O site, O is bonded in a 2-coordinate geometry to one K, one Zn, and one P atom. In the third O site, O is bonded in a single-bond geometry to two equivalent K and one P atom. In the fourth O site, O is bonded in a bent 120 degrees geometry to one Zn and one P atom. In the fifth O site, O is bonded in a bent 120 degrees geometry to one Zn and one P atom. In the sixth O site, O is bonded in a distorted single-bond geometry to one K and one P atom. In the seventh O site, O is bonded in a distorted bent 120 degrees geometry to two equivalent K, one Zn, and one P atom. In the eighth O site, O is bonded in a distorted bent 120 degrees geometry to one K and two equivalent P atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2Zn(PO3)4 by Materials Project

K2Zn(PO3)4 crystallizes in the monoclinic Cc space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of K–O bond distances ranging from 2.78–2.94 Å. In the second 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 2.68–3.18 Å. Zn2+ is bonded to six O2- atoms to form ZnO6 octahedra that share corners with six PO4 tetrahedra. There are a spread of Zn–O bond distances ranging from 2.05–2.39 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 two equivalent ZnO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 48–55°. There are a spread of P–O bond distances ranging from 1.50–1.61 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one ZnO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedral tilt angles are 38°. There are a spread of P–O bond distances ranging from 1.49–1.63 Å. In the third P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one ZnO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. There are a spread of P–O bond distances ranging from 1.49–1.63 Å. In the fourth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent ZnO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 46–51°. There are a spread of P–O bond distances ranging from 1.50–1.63 Å. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to two P5+ atoms. In the second O2- site, O2- is bonded in a 2-coordinate geometry to one K1+ and two P5+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Zn2+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to two K1+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one K1+ and two P5+ atoms. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to two K1+, one Zn2+, and one P5+ atom. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Zn2+, and one P5+ atom. In the eighth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two P5+ atoms. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to two K1+, one Zn2+, and one P5+ atom. In the tenth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Zn2+ and one P5+ atom. In the eleventh O2- site, O2- is bonded in a distorted single-bond geometry to two K1+ and one P5+ atom. In the twelfth O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Zn2+, and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2Zn4P4O21 by Materials Project

(KZn2(PO5)2)4O2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional and consists of one hydrogen peroxide molecule and one KZn2(PO5)2 framework. In the KZn2(PO5)2 framework, there are two inequivalent K sites. In the first K site, K is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of K–O bond distances ranging from 2.72–3.24 Å. In the second K site, K is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of K–O bond distances ranging from 2.88–3.32 Å. There are four inequivalent Zn sites. In the first Zn site, Zn is bonded in a rectangular see-saw-like geometry to four O atoms. There are a spread of Zn–O bond distances ranging from 1.88–2.06 Å. In the second Zn site, Zn is bonded to four O atoms to form ZnO4 tetrahedra that share corners with four PO4 tetrahedra. There are a spread of Zn–O bond distances ranging from 1.93–1.98 Å. In the third Zn site, Zn is bonded to four O atoms to form ZnO4 tetrahedra that share corners with four PO4 tetrahedra. There are a spread of Zn–O bond distances ranging from 1.92–2.00 Å. In the fourth Zn site, Zn is bonded to four O atoms to form ZnO4 tetrahedra that share corners with four PO4 tetrahedra. There are a spread of Zn–O bond distances ranging from 1.93–2.03 Å. There are four inequivalent P sites. In the first P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with three ZnO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.54–1.58 Å. In the second P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with three ZnO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.53–1.56 Å. In the third P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with four ZnO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.54–1.59 Å. In the fourth P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with two ZnO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.54–1.56 Å. There are twenty inequivalent O sites. In the first O site, O is bonded in a distorted T-shaped geometry to two equivalent Zn and one P atom. In the second O site, O is bonded in a 3-coordinate geometry to one K, one Zn, and one P atom. In the third O site, O is bonded in a distorted bent 120 degrees geometry to one K, one Zn, and one P atom. In the fourth O site, O is bonded in a distorted bent 120 degrees geometry to one K, one Zn, and one P atom. In the fifth O site, O is bonded in a distorted single-bond geometry to one K and one P atom. In the sixth O site, O is bonded in a 2-coordinate geometry to one K, one Zn, and one P atom. In the seventh O site, O is bonded in a distorted bent 120 degrees geometry to one Zn and one P atom. In the eighth O site, O is bonded in a 2-coordinate geometry to one K, one Zn, and one P atom. In the ninth O site, O is bonded in a 2-coordinate geometry to one K, one Zn, and one P atom. In the tenth O site, O is bonded in a distorted bent 150 degrees geometry to one Zn and one P atom. In the eleventh O site, O is bonded in a distorted bent 120 degrees geometry to one K, one Zn, and one P atom. In the twelfth O site, O is bonded in a 2-coordinate geometry to one K, one Zn, and one P atom. In the thirteenth O site, O is bonded in a distorted bent 150 degrees geometry to one K, one Zn, and one P atom. In the fourteenth O site, O is bonded in a 2-coordinate geometry to one K, one Zn, and one P atom. In the fifteenth O site, O is bonded in a distorted water-like geometry to one K and one P atom. In the sixteenth O site, O is bonded in a bent 150 degrees geometry to one Zn and one P atom. In the seventeenth O site, O is bonded in a single-bond geometry to one O atom. The O–O bond length is 1.24 Å. In the eighteenth O site, O is bonded in a single-bond geometry to one K and one Zn atom. In the nineteenth O site, O is bonded in a water-like geometry to one K and one O atom. In the twentieth O site, O is bonded in a water-like geometry to two K atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KZn2(PO4)2 by Materials Project

KZn2(PO4)2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. K is bonded to six O atoms to form distorted KO6 octahedra that share corners with four PO4 tetrahedra, corners with five ZnO4 tetrahedra, and an edgeedge with one PO4 tetrahedra. There are a spread of K–O bond distances ranging from 2.69–3.02 Å. There are two inequivalent Zn sites. In the first Zn site, Zn is bonded to four O atoms to form ZnO4 tetrahedra that share corners with two equivalent KO6 octahedra, a cornercorner with one ZnO4 tetrahedra, and corners with four PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 58–72°. There are a spread of Zn–O bond distances ranging from 1.94–2.07 Å. In the second Zn site, Zn is bonded to four O atoms to form ZnO4 tetrahedra that share corners with three equivalent KO6 octahedra, a cornercorner with one ZnO4 tetrahedra, and corners with four PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 63–67°. There are a spread of Zn–O bond distances ranging from 1.93–1.98 Å. There are two inequivalent P sites. In the first P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with three equivalent KO6 octahedra and corners with three ZnO4 tetrahedra. The corner-sharing octahedra tilt angles range from 51–65°. There are a spread of P–O bond distances ranging from 1.53–1.57 Å. In the second P site, P is bonded to four O atoms to form PO4 tetrahedra that share a cornercorner with one KO6 octahedra, corners with five ZnO4 tetrahedra, and an edgeedge with one KO6 octahedra. The corner-sharing octahedral tilt angles are 70°. There are a spread of P–O bond distances ranging from 1.54–1.59 Å. There are eight inequivalent O sites. In the first O site, O is bonded in a trigonal planar geometry to two Zn and one P atom. In the second O site, O is bonded in a distorted trigonal planar geometry to one K, one Zn, and one P atom. In the third O site, O is bonded in a 2-coordinate geometry to one K, one Zn, and one P atom. In the fourth O site, O is bonded in a distorted single-bond geometry to one K and one P atom. In the fifth O site, O is bonded in a 2-coordinate geometry to one K, one Zn, and one P atom. In the sixth O site, O is bonded in a distorted trigonal planar geometry to one K, one Zn, and one P atom. In the seventh O site, O is bonded in a distorted bent 150 degrees geometry to one Zn and one P atom. In the eighth O site, O is bonded in a 3-coordinate geometry to one K, one Zn, and one P atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K4Zn(P3O11)2 by Materials Project

K4Zn(P3O11)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two 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 2.78–2.96 Å. In the second K site, K is bonded to six O atoms to form distorted KO6 pentagonal pyramids that share corners with six PO4 tetrahedra and an edgeedge with one KO6 pentagonal pyramid. There are a spread of K–O bond distances ranging from 2.79–3.14 Å. Zn is bonded to six O atoms to form ZnO6 octahedra that share corners with two equivalent PO4 tetrahedra. There are four shorter (1.98 Å) and two longer (2.13 Å) Zn–O bond lengths. There are two inequivalent P sites. In the first P site, P is bonded to four O atoms to form PO4 tetrahedra that share a cornercorner with one ZnO6 octahedra, corners with two equivalent KO6 pentagonal pyramids, and corners with two equivalent PO4 tetrahedra. The corner-sharing octahedral tilt angles are 41°. There are a spread of P–O bond distances ranging from 1.49–1.63 Å. In the second P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with two equivalent KO6 pentagonal pyramids and corners with two PO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.50–1.64 Å. There are seven inequivalent O sites. In the first O site, O is bonded in a bent 120 degrees geometry to two P atoms. In the second O site, O is bonded in a 2-coordinate geometry to one K and two equivalent P atoms. In the third O site, O is bonded in a bent 120 degrees geometry to one K and one Zn atom. In the fourth O site, O is bonded in a distorted single-bond geometry to three K and one P atom. In the fifth O site, O is bonded in a distorted bent 150 degrees geometry to one Zn and one P atom. In the sixth O site, O is bonded in a distorted single-bond geometry to two K and one P atom. In the seventh O site, O is bonded in a single-bond geometry to one K and one P atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KZn(PO3)3 by Materials Project

KZn(PO3)3 crystallizes in the hexagonal P-6c2 space group. The structure is three-dimensional. K1+ is bonded in a 6-coordinate geometry to six equivalent O2- atoms. All K–O bond lengths are 2.80 Å. Zn2+ is bonded to six equivalent O2- atoms to form ZnO6 octahedra that share corners with six equivalent PO4 tetrahedra. All Zn–O bond lengths are 2.12 Å. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent ZnO6 octahedra and corners with two equivalent PO4 tetrahedra. The corner-sharing octahedral tilt angles are 42°. There are a spread of P–O bond distances ranging from 1.50–1.62 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to one K1+, one Zn2+, and one P5+ atom. In the second O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent P5+ atoms.

36 MATERIALS SCIENCE↗