DOE OSTI2020
Ca8FeAl11(Si3O13)4 is Esseneite-derived structured and crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are eight inequivalent Ca sites. In the first Ca site, Ca is bonded in a 1-coordinate geometry to ten O atoms. There are a spread of Ca–O bond distances ranging from 2.30–3.04 Å. In the second Ca site, Ca is bonded in a 1-coordinate geometry to eight O atoms. There are a spread of Ca–O bond distances ranging from 2.29–2.78 Å. In the third Ca site, Ca is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Ca–O bond distances ranging from 2.30–2.77 Å. In the fourth Ca site, Ca is bonded in a 1-coordinate geometry to eight O atoms. There are a spread of Ca–O bond distances ranging from 2.29–2.78 Å. In the fifth Ca site, Ca is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Ca–O bond distances ranging from 2.34–3.01 Å. In the sixth Ca site, Ca is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Ca–O bond distances ranging from 2.31–3.01 Å. In the seventh Ca site, Ca is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Ca–O bond distances ranging from 2.31–3.01 Å. In the eighth Ca site, Ca is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Ca–O bond distances ranging from 2.31–3.01 Å. Fe is bonded to six O atoms to form FeO6 octahedra that share corners with five SiO4 tetrahedra and edges with two equivalent AlO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.91–2.26 Å. There are seven inequivalent Al sites. In the first Al site, Al is bonded to six O atoms to form AlO6 octahedra that share corners with four SiO4 tetrahedra and edges with four AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.85–1.96 Å. In the second Al site, Al is bonded to six O atoms to form AlO6 octahedra that share corners with four SiO4 tetrahedra, an edgeedge with one FeO6 octahedra, and edges with three AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.84–1.98 Å. In the third Al site, Al is bonded to six O atoms to form AlO6 octahedra that share corners with four SiO4 tetrahedra and edges with two equivalent AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.85–1.97 Å. In the fourth Al site, Al is bonded to six O atoms to form AlO6 octahedra that share corners with four SiO4 tetrahedra and edges with two equivalent AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.85–1.97 Å. In the fifth Al site, Al is bonded to six O atoms to form distorted AlO6 octahedra that share corners with five SiO4 tetrahedra and edges with two equivalent AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.81–2.27 Å. In the sixth Al site, Al is bonded to six O atoms to form distorted AlO6 octahedra that share corners with five SiO4 tetrahedra and edges with two equivalent AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.81–2.27 Å. In the seventh Al site, Al is bonded to six O atoms to form distorted AlO6 octahedra that share corners with five SiO4 tetrahedra and edges with two equivalent AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.81–2.27 Å. There are twelve inequivalent Si sites. In the first Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two equivalent FeO6 octahedra, corners with two equivalent AlO6 octahedra, and a cornercorner with one SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 54–56°. There is one shorter (1.60 Å) and three longer (1.66 Å) Si–O bond length. In the second Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with four AlO6 octahedra and a cornercorner with one SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 53–57°. There is one shorter (1.59 Å) and three longer (1.66 Å) Si–O bond length. In the third Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with four AlO6 octahedra and a cornercorner with one SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 53–57°. There are a spread of Si–O bond distances ranging from 1.59–1.67 Å. In the fourth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with four AlO6 octahedra and a cornercorner with one SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 53–57°. There is one shorter (1.60 Å) and three longer (1.66 Å) Si–O bond length. In the fifth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one FeO6 octahedra, corners with two equivalent AlO6 octahedra, and a cornercorner with one SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 35–54°. There are a spread of Si–O bond distances ranging from 1.60–1.65 Å. In the sixth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with three AlO6 octahedra and a cornercorner with one SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 28–52°. There are a spread of Si–O bond distances ranging from 1.61–1.65 Å. In the seventh Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with three AlO6 octahedra and a cornercorner with one SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 27–52°. There is one shorter (1.61 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 corners with three AlO6 octahedra and a cornercorner with one SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 28–52°. There are a spread of Si–O bond distances ranging from 1.60–1.65 Å. In the ninth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two equivalent FeO6 octahedra and corners with four AlO6 octahedra. The corner-sharing octahedra tilt angles range from 48–55°. There is three shorter (1.65 Å) and one longer (1.68 Å) Si–O bond length. In the tenth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with six AlO6 octahedra. The corner-sharing octahedra tilt angles range from 47–53°. There is three shorter (1.65 Å) and one longer (1.68 Å) Si–O bond length. In the eleventh Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with six AlO6 octahedra. The corner-sharing octahedra tilt angles range from 47–53°. There are a spread of Si–O bond distances ranging from 1.65–1.68 Å. In the twelfth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with six AlO6 octahedra. The corner-sharing octahedra tilt angles range from 48–53°. There are a spread of Si–O bond distances ranging from 1.65–1.67 Å. There are forty inequivalent O sites. In the first O site, O is bonded in a 4-coordinate geometry to two Ca, one Fe, and one Si atom. In the second O site, O is bonded in a 2-coordinate geometry to two Ca, one Al, and one Si atom. In the third O site, O is bonded in a 2-coordinate geometry to two Ca, one Al, and one Si atom. In the fourth O site, O is bonded in a 2-coordinate geometry to two Ca, one Al, and one Si atom. In the fifth O site, O is bonded in a 2-coordinate geometry to two Ca, one Al, and one Si atom. In the sixth O site, O is bonded in a 4-coordinate geometry to two Ca, one Al, and one Si atom. In the seventh O site, O is bonded in a 4-coordinate geometry to two Ca, one Al, and one Si atom. In the eighth O site, O is bonded in a 4-coordinate geometry to two Ca, one Al, and one Si atom. In the ninth O site, O is bonded in a distorted trigonal planar geometry to two Ca and one Si atom. In the tenth O site, O is bonded in a distorted trigonal planar geometry to two Ca and one Si atom. In the eleventh O site, O is bonded in a distorted trigonal planar geometry to two Ca and one Si atom. In the twelfth O site, O is bonded in a distorted trigonal planar geometry to two Ca and one Si atom. In the thirteenth O site, O is bonded in a trigonal non-coplanar geometry to one Fe and two equivalent Al atoms. In the fourteenth O site, O is bonded in a trigonal non-coplanar geometry to three Al atoms. In the fifteenth O site, O is bonded in a trigonal non-coplanar geometry to three Al atoms. In the sixteenth O site, O is bonded in a trigonal non-coplanar geometry to three Al atoms. In the seventeenth O site, O is bonded in a 4-coordinate geometry to one Ca, two equivalent Al, and one Si atom. In the eighteenth O site, O is bonded in a 4-coordinate geometry to one Ca, two equivalent Al, and one Si atom. In the nineteenth O site, O is bonded in a 4-coordinate geometry to one Ca, two equivalent Al, and one Si atom. In the twentieth O site, O is bonded in a 4-coordinate geometry to one Ca, two equivalent Al, and one Si atom. In the twenty-first O site, O is bonded in a 4-coordinate geometry to one Ca, two equivalent Al, and one Si atom. In the twenty-second O site, O is bonded in a 3-coordinate geometry to one Ca, two equivalent Al, and one Si atom. In the twenty-third O site, O is bonded in a 4-coordinate geometry to one Ca, two equivalent Al, and one Si atom. In the twenty-fourth O site, O is bonded in a 4-coordinate geometry to one Ca, two equivalent Al, and one Si atom. In the twenty-fifth O site, O is bonded in a bent 150 degrees geometry to two equivalent Ca and two Si atoms. In the twenty-sixth O site, O is bonded in a distorted bent 150 degrees geometry to two equivalent Ca and two Si atoms. In the twenty-seventh O site, O is bonded in a distorted bent 150 degrees geometry to two equivalent Ca and two Si atoms. In the twenty-eighth O site, O is bonded in a distorted bent 150 degrees geometry to two equivalent Ca and two Si atoms. In the twenty-ninth O site, O is bonded in a bent 150 degrees geometry to two equivalent Ca, one Fe, and one Si atom. In the thirtieth O site, O is bonded in a bent 150 degrees geometry to one Al and one Si atom. In the thirty-first O site, O is bonded in a bent 150 degrees geometry to one Al and one Si atom. In the thirty-second O site, O is bonded in a bent 150 degrees geometry to one Al and one Si atom. In the thirty-third O site, O is bonded in a distorted trigonal non-coplanar geometry to one Ca and two equivalent Al atoms. In the thirty-fourth O site, O is bonded in a distorted trigonal non-coplanar geometry to one Ca and two equivalent Al atoms. In the thirty-fifth O site, O is bonded in a distorted trigonal non-coplanar geometry to one Ca and two equivalent Al atoms. In the thirty-sixth O site, O is bonded in a distorted trigonal non-coplanar geometry to one Ca and two equivalent Al atoms. In the thirty-seventh O site, O is bonded to one Ca, one Fe, one Al, and one Si atom to form a mixture of distorted edge and corner-sharing OCaAlFeSi tetrahedra. In the thirty-eighth O site, O is bonded to one Ca, two Al, and one Si atom to form a mixture of distorted edge and corner-sharing OCaAl2Si tetrahedra. In the thirty-ninth O site, O is bonded to one Ca, two Al, and one Si atom to form a mixture of distorted edge and corner-sharing OCaAl2Si tetrahedra. In the fortieth O site, O is bonded to one Ca, two Al, and one Si atom to form distorted OCaAl2Si tetrahedra that share corners with two OCaAlFeSi tetrahedra and an edgeedge with one OCaAl2Si tetrahedra.