DOE OSTI2020
U2Y5O12 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent U+4.50+ sites. In the first U+4.50+ site, U+4.50+ is bonded in an octahedral geometry to six O2- atoms. There are a spread of U–O bond distances ranging from 2.15–2.22 Å. In the second U+4.50+ site, U+4.50+ is bonded in an octahedral geometry to six O2- atoms. There are a spread of U–O bond distances ranging from 2.15–2.19 Å. In the third U+4.50+ site, U+4.50+ is bonded in an octahedral geometry to six O2- atoms. There are a spread of U–O bond distances ranging from 2.15–2.21 Å. In the fourth U+4.50+ site, U+4.50+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of U–O bond distances ranging from 2.17–2.64 Å. In the fifth U+4.50+ site, U+4.50+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of U–O bond distances ranging from 2.17–2.64 Å. In the sixth U+4.50+ site, U+4.50+ is bonded in an octahedral geometry to six O2- atoms. There are a spread of U–O bond distances ranging from 2.15–2.21 Å. In the seventh U+4.50+ site, U+4.50+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of U–O bond distances ranging from 2.17–2.65 Å. In the eighth U+4.50+ site, U+4.50+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of U–O bond distances ranging from 2.18–2.66 Å. There are twenty inequivalent Y3+ sites. In the first Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.24–2.67 Å. In the second Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.24–2.67 Å. In the third Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.24–2.67 Å. In the fourth Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.28–2.69 Å. In the fifth Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.23–2.68 Å. In the sixth Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.24–2.66 Å. In the seventh Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.28–2.70 Å. In the eighth Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.23–2.67 Å. In the ninth Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.26–2.73 Å. In the tenth Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.25–2.69 Å. In the eleventh Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.27–2.71 Å. In the twelfth Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.24–2.72 Å. In the thirteenth Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.23–2.70 Å. In the fourteenth Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.26–2.70 Å. In the fifteenth Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.23–2.63 Å. In the sixteenth Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.23–2.72 Å. In the seventeenth Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.26–2.70 Å. In the eighteenth Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.23–2.74 Å. In the nineteenth Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.25–2.69 Å. In the twentieth Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.28–2.71 Å. There are forty-eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two U+4.50+ and two Y3+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to one U+4.50+ and three Y3+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two U+4.50+ and two Y3+ atoms. In the fourth O2- site, O2- is bonded to one U+4.50+ and three Y3+ atoms to form a mixture of corner and edge-sharing OY3U tetrahedra. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to one U+4.50+ and three Y3+ atoms. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to two U+4.50+ and two Y3+ atoms. In the seventh O2- site, O2- is bonded in a 4-coordinate geometry to one U+4.50+ and three Y3+ atoms. In the eighth O2- site, O2- is bonded to four Y3+ atoms to form a mixture of corner and edge-sharing OY4 tetrahedra. In the ninth O2- site, O2- is bonded to one U+4.50+ and three Y3+ atoms to form a mixture of corner and edge-sharing OY3U tetrahedra. In the tenth O2- site, O2- is bonded in a 4-coordinate geometry to one U+4.50+ and three Y3+ atoms. In the eleventh O2- site, O2- is bonded in a 4-coordinate geometry to one U+4.50+ and three Y3+ atoms. In the twelfth O2- site, O2- is bonded to four Y3+ atoms to form a mixture of corner and edge-sharing OY4 tetrahedra. In the thirteenth O2- site, O2- is bonded in a 4-coordinate geometry to one U+4.50+ and three Y3+ atoms. In the fourteenth O2- site, O2- is bonded to four Y3+ atoms to form a mixture of corner and edge-sharing OY4 tetrahedra. In the fifteenth O2- site, O2- is bonded to one U+4.50+ and three Y3+ atoms to form OY3U tetrahedra that share corners with six OY4 tetrahedra and edges with three OY3U tetrahedra. In the sixteenth O2- site, O2- is bonded in a 4-coordinate geometry to one U+4.50+ and three Y3+ atoms. In the seventeenth O2- site, O2- is bonded to one U+4.50+ and three Y3+ atoms to form a mixture of distorted corner and edge-sharing OY3U tetrahedra. In the eighteenth O2- site, O2- is bonded to four Y3+ atoms to form OY4 tetrahedra that share corners with six OY3U tetrahedra and edges with three OY4 tetrahedra. In the nineteenth O2- site, O2- is bonded in a 4-coordinate geometry to one U+4.50+ and three Y3+ atoms. In the twentieth O2- site, O2- is bonded to four Y3+ atoms to form a mixture of corner and edge-sharing OY4 tetrahedra. In the twenty-first O2- site, O2- is bonded to four Y3+ atoms to form a mixture of corner and edge-sharing OY4 tetrahedra. In the twenty-second O2- site, O2- is bonded to one U+4.50+ and three Y3+ atoms to form a mixture of corner and edge-sharing OY3U tetrahedra. In the twenty-third O2- site, O2- is bonded in a 4-coordinate geometry to two U+4.50+ and two Y3+ atoms. In the twenty-fourth O2- site, O2- is bonded to one U+4.50+ and three Y3+ atoms to form a mixture of distorted corner and edge-sharing OY3U tetrahedra. In the twenty-fifth O2- site, O2- is bonded to four Y3+ atoms to form a mixture of corner and edge-sharing OY4 tetrahedra. In the twenty-sixth O2- site, O2- is bonded in a 4-coordinate geometry to two U+4.50+ and two Y3+ atoms. In the twenty-seventh O2- site, O2- is bonded to four Y3+ atoms to form OY4 tetrahedra that share corners with six OY3U tetrahedra and edges with three OY4 tetrahedra. In the twenty-eighth O2- site, O2- is bonded to one U+4.50+ and three Y3+ atoms to form a mixture of corner and edge-sharing OY3U tetrahedra. In the twenty-ninth O2- site, O2- is bonded to one U+4.50+ and three Y3+ atoms to form OY3U tetrahedra that share corners with six OY3U tetrahedra and edges with three OY4 tetrahedra. In the thirtieth O2- site, O2- is bonded in a 4-coordinate geometry to one U+4.50+ and three Y3+ atoms. In the thirty-first O2- site, O2- is bonded to one U+4.50+ and three Y3+ atoms to form a mixture of distorted corner and edge-sharing OY3U tetrahedra. In the thirty-second O2- site, O2- is bonded to one U+4.50+ and three Y3+ atoms to form a mixture of corner and edge-sharing OY3U tetrahedra. In the thirty-third O2- site, O2- is bonded in a 4-coordinate geometry to two U+4.50+ and two Y3+ atoms. In the thirty-fourth O2- site, O2- is bonded to one U+4.50+ and three Y3+ atoms to form OY3U tetrahedra that share corners with six OY4 tetrahedra and edges with three OY3U tetrahedra. In the thirty-fifth O2- site, O2- is bonded to one U+4.50+ and three Y3+ atoms to form a mixture of corner and edge-sharing OY3U tetrahedra. In the thirty-sixth O2- site, O2- is bonded in a 4-coordinate geometry to one U+4.50+ and three Y3+ atoms. In the thirty-seventh O2- site, O2- is bonded to one U+4.50+ and three Y3+ atoms to form OY3U tetrahedra that share corners with six OY4 tetrahedra and edges with three OY3U tetrahedra. In the thirty-eighth O2- site, O2- is bonded in a 4-coordinate geometry to two U+4.50+ and two Y3+ atoms. In the thirty-ninth O2- site, O2- is bonded in a 4-coordinate geometry to two U+4.50+ and two Y3+ atoms. In the fortieth O2- site, O2- is bonded to one U+4.50+ and three Y3+ atoms to form OY3U tetrahedra that share corners with six OY4 tetrahedra and edges with three OY3U tetrahedra. In the forty-first O2- site, O2- is bonded to one U+4.50+ and three Y3+ atoms to form a mixture of distorted corner and edge-sharing OY3U tetrahedra. In the forty-second O2- site, O2- is bonded in a 3-coordinate geometry to one U+4.50+ and three Y3+ atoms. In the forty-third O2- site, O2- is bonded in a 4-coordinate geometry to two U+4.50+ and two Y3+ atoms. In the forty-fourth O2- site, O2- is bonded in a 4-coordinate geometry to two U+4.50+ and two Y3+ atoms. In the forty-fifth O2- site, O2- is bonded to one U+4.50+ and three Y3+ atoms to form a mixture of corner and edge-sharing OY3U tetrahedra. In the forty-sixth O2- site, O2- is bonded in a 4-coordinate geometry to two U+4.50+ and two Y3+ atoms. In the forty-seventh O2- site, O2- is bonded in a 4-coordinate geometry to one U+4.50+ and three Y3+ atoms. In the forty-eighth O2- site, O2- is bonded in a 4-coordinate geometry to two U+4.50+ and two Y3+ atoms.