Materials Data on CaAl2(Si2O7)2 by Materials Project

Dataset · Fri May 01 04:00:00 EDT 2020

DOI:https://doi.org/10.17188/1678419· OSTI ID:1678419

CaAl2(Si2O7)2 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are two inequivalent Ca sites. In the first Ca site, Ca is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ca–O bond distances ranging from 2.34–2.48 Å. In the second Ca site, Ca is bonded to six O atoms to form distorted CaO6 pentagonal pyramids that share corners with four SiO4 tetrahedra and edges with two equivalent AlO4 tetrahedra. There are a spread of Ca–O bond distances ranging from 2.34–2.50 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with four SiO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.73–1.80 Å. In the second Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with four SiO4 tetrahedra and an edgeedge with one CaO6 pentagonal pyramid. There are a spread of Al–O bond distances ranging from 1.73–1.80 Å. There are four inequivalent Si sites. In the first Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.65 Å. In the second Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.60–1.65 Å. In the third Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one CaO6 pentagonal pyramid, corners with two AlO4 tetrahedra, and corners with two SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.60–1.65 Å. In the fourth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one CaO6 pentagonal pyramid, corners with two AlO4 tetrahedra, and corners with two SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.60–1.65 Å. There are sixteen inequivalent O sites. In the first O site, O is bonded in a bent 150 degrees geometry to two equivalent Si atoms. In the second O site, O is bonded in a 3-coordinate geometry to one Ca, one Al, and one Si atom. In the third O site, O is bonded in a distorted trigonal planar geometry to one Ca, one Al, and one Si atom. In the fourth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the fifth O site, O is bonded in a bent 150 degrees geometry to one Al and one Si atom. In the sixth O site, O is bonded in a bent 150 degrees geometry to two equivalent Si atoms. In the seventh O site, O is bonded in a bent 150 degrees geometry to one Al and one Si atom. In the eighth O site, O is bonded in a bent 150 degrees geometry to one Al and one Si atom. In the ninth O site, O is bonded in a bent 150 degrees geometry to two equivalent Si atoms. In the tenth O site, O is bonded in a distorted trigonal planar geometry to one Ca, one Al, and one Si atom. In the eleventh O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the twelfth O site, O is bonded in a bent 150 degrees geometry to one Al and one Si atom. In the thirteenth O site, O is bonded in a 3-coordinate geometry to one Ca, one Al, and one Si atom. In the fourteenth O site, O is bonded in a bent 150 degrees geometry to two equivalent Si atoms. In the fifteenth O site, O is bonded in a single-bond geometry to one Ca atom. In the sixteenth O site, O is bonded in a single-bond geometry to one Ca atom.

• Research Organization: LBNL Materials Project; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• Contributing Organization: The Materials Project; MIT; UC Berkeley; Duke; U Louvain
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 1678419
• Report Number(s): mp-1197555
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Al-Ca-O-Si
CaAl2(Si2O7)2
crystal structure