DOE OSTI2020
Na2Nb18Tl5(PO8)9(Tl)2 crystallizes in the triclinic P1 space group. The structure is three-dimensional and consists of two thallium molecules and one Na2Nb18Tl5(PO8)9 framework. In the Na2Nb18Tl5(PO8)9 framework, there are two inequivalent Na sites. In the first Na site, Na is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Na–O bond distances ranging from 2.48–2.53 Å. In the second Na site, Na is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Na–O bond distances ranging from 2.47–2.52 Å. There are eighteen inequivalent Nb sites. In the first Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 9–39°. There are a spread of Nb–O bond distances ranging from 1.89–2.17 Å. In the second Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 9–37°. There are a spread of Nb–O bond distances ranging from 1.89–2.17 Å. In the third Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 7–36°. There are a spread of Nb–O bond distances ranging from 1.90–2.17 Å. In the fourth Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 7–34°. There are a spread of Nb–O bond distances ranging from 1.87–2.16 Å. In the fifth Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 7–36°. There are a spread of Nb–O bond distances ranging from 1.88–2.16 Å. In the sixth Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 1–39°. There are a spread of Nb–O bond distances ranging from 1.86–2.13 Å. In the seventh Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 7–32°. There are a spread of Nb–O bond distances ranging from 1.88–2.16 Å. In the eighth Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 2–34°. There are a spread of Nb–O bond distances ranging from 1.86–2.18 Å. In the ninth Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 6–37°. There are a spread of Nb–O bond distances ranging from 1.89–2.13 Å. In the tenth Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 1–37°. There are a spread of Nb–O bond distances ranging from 1.85–2.18 Å. In the eleventh Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 2–38°. There are a spread of Nb–O bond distances ranging from 1.87–2.15 Å. In the twelfth Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 7–34°. There are a spread of Nb–O bond distances ranging from 1.89–2.17 Å. In the thirteenth Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 6–37°. There are a spread of Nb–O bond distances ranging from 1.86–2.17 Å. In the fourteenth Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 4–37°. There are a spread of Nb–O bond distances ranging from 1.87–2.17 Å. In the fifteenth Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 7–38°. There are a spread of Nb–O bond distances ranging from 1.89–2.11 Å. In the sixteenth Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 4–37°. There are a spread of Nb–O bond distances ranging from 1.88–2.13 Å. In the seventeenth Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 5–37°. There are a spread of Nb–O bond distances ranging from 1.86–2.17 Å. In the eighteenth Nb site, Nb is bonded to six O atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 5–34°. There are a spread of Nb–O bond distances ranging from 1.88–2.13 Å. There are five inequivalent Tl sites. In the first Tl site, Tl is bonded in a single-bond geometry to one O atom. The Tl–O bond length is 2.81 Å. In the second Tl site, Tl is bonded in a 3-coordinate geometry to three O atoms. There are a spread of Tl–O bond distances ranging from 2.53–2.78 Å. In the third Tl site, Tl is bonded in a 1-coordinate geometry to one O atom. The Tl–O bond length is 2.66 Å. In the fourth Tl site, Tl is bonded in a 3-coordinate geometry to three O atoms. There are a spread of Tl–O bond distances ranging from 2.82–2.85 Å. In the fifth Tl site, Tl is bonded in a 1-coordinate geometry to four O atoms. There are a spread of Tl–O bond distances ranging from 2.76–2.93 Å. There are nine inequivalent P sites. In the first P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with four NbO6 octahedra. The corner-sharing octahedra tilt angles range from 38–43°. There are a spread of P–O bond distances ranging from 1.53–1.56 Å. In the second P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with four NbO6 octahedra. The corner-sharing octahedra tilt angles range from 33–40°. There is one shorter (1.54 Å) and three longer (1.55 Å) P–O bond length. In the third P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with four NbO6 octahedra. The corner-sharing octahedra tilt angles range from 32–44°. There is one shorter (1.54 Å) and three longer (1.55 Å) P–O bond length. In the fourth P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with four NbO6 octahedra. The corner-sharing octahedra tilt angles range from 37–40°. There are a spread of P–O bond distances ranging from 1.54–1.56 Å. In the fifth P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with four NbO6 octahedra. The corner-sharing octahedra tilt angles range from 37–41°. There are a spread of P–O bond distances ranging from 1.54–1.56 Å. In the sixth P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with four NbO6 octahedra. The corner-sharing octahedra tilt angles range from 37–41°. There are a spread of P–O bond distances ranging from 1.54–1.56 Å. In the seventh P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with four NbO6 octahedra. The corner-sharing octahedra tilt angles range from 31–47°. There are a spread of P–O bond distances ranging from 1.54–1.56 Å. In the eighth P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with four NbO6 octahedra. The corner-sharing octahedra tilt angles range from 38–43°. There are a spread of P–O bond distances ranging from 1.54–1.56 Å. In the ninth P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with four NbO6 octahedra. The corner-sharing octahedra tilt angles range from 39–42°. There are a spread of P–O bond distances ranging from 1.54–1.56 Å. There are seventy-two inequivalent O sites. In the first O site, O is bonded in a 3-coordinate geometry to one Na, one Nb, and one P atom. In the second O site, O is bonded in a bent 150 degrees geometry to two Nb atoms. In the third O site, O is bonded in a 3-coordinate geometry to one Na, one Nb, and one P atom. In the fourth O site, O is bonded in a 2-coordinate geometry to one Nb, one Tl, and one P atom. In the fifth O site, O is bonded in a bent 150 degrees geometry to one Nb and one P atom. In the sixth O site, O is bonded in a bent 150 degrees geometry to one Nb and one P atom. In the seventh O site, O is bonded in a bent 150 degrees geometry to one Nb and one P atom. In the eighth O site, O is bonded in a bent 150 degrees geometry to two Nb atoms. In the ninth O site, O is bonded in a bent 150 degrees geometry to two Nb atoms. In the tenth O site, O is bonded in a bent 150 degrees geometry to one Nb and one P atom. In the eleventh O site, O is bonded in a linear geometry to two Nb atoms. In the twelfth O site, O is bonded in a distorted bent 150 degrees geometry to one Nb, one Tl, and one P atom. In the thirteenth O site, O is bonded in a 3-coordinate geometry to one Nb, one Tl, and one P atom. In the fourteenth O site, O is bonded in a distorted bent 150 degrees geometry to two Nb and one Tl atom. In the fifteenth O site, O is bonded in a 3-coordinate geometry to one Na, one Nb, and one P atom. In the sixteenth O site, O is bonded in a bent 150 degrees geometry to two Nb atoms. In the seventeenth O site, O is bonded in a distorted bent 150 degrees geometry to one Nb and one P atom. In the eighteenth O site, O is bonded in a 3-coordinate geometry to one Na, one Nb, and one P atom. In the nineteenth O site, O is bonded in a linear geometry to two Nb atoms. In the twentieth O site, O is bonded in a bent 150 degrees geometry to two Nb atoms. In the twenty-first O site, O is bonded in a bent 150 degrees geometry to two Nb atoms. In the twenty-second O site, O is bonded in a distorted bent 150 degrees geometry to one Nb and one P atom. In the twenty-third O site, O is bonded in a linear geometry to two Nb atoms. In the twenty-fourth O site, O is bonded in a bent 150 degrees geometry to two Nb atoms. In the twenty-fifth O site, O is bonded in a 3-coordinate geometry to one Na, one Nb, and one P atom. In the twenty-sixth O site, O is bonded in a bent 150 degrees geometry to two Nb atoms. In the twenty-seventh O site, O is bonded in a bent 150 degrees geometry to two Nb atoms. In the twenty-eighth O site, O is bonded in a bent 150 degrees geometry to one Nb and one P atom. In the twenty-ninth O site, O is bonded in a distorted bent 150 degrees geometry to two Nb and one Tl atom. In the thirtieth O site, O is bonded in a bent 150 degrees geometry to two Nb atoms. In the thirty-first O site, O is bonded in a distorted bent 150 degrees geometry to two Nb atoms. In the thirty-second O site, O is bonded in a linear geometry to two Nb atoms. In the thirty-third O site, O is bonded in a 2-coordinate geometry to one Nb, one Tl, and one P atom. In the thirty-fourth O site, O is bonded in a 2-coordinate geometry to one Nb, one Tl, and one P atom. In the thirty-fifth O site, O is bonded in a bent 150 degrees geometry to two Nb atoms. In the thirty-sixth O site, O is bonded in a 3-coordinate geometry to one Na, one Nb,