Crystal structures and polymorphism in compounds Bi{sub 6+x}T{sub 1-x}P{sub 2}O{sub 15+y}, T=first row transition metals and Pb
- Texas Materials Institute and Department of Chemical Engineering, University of Texas at Austin, 1 University Station C0400, Austin, TX 78712 (United States)
- Department of Chemistry and Biochemistry, University of Texas at Austin, 1 University Station A5300, Austin, TX 78712 (United States)
The compounds Bi{sub 6+x}T{sub 1-x}P{sub 2}O{sub 15+y}, T=Ti, Cr, Mn, Fe, Co, Ni, Cu, Zn and Pb display five polymorphic forms. Polymorph A is formed by the Ti, Mn, Fe and Ni phases. Polymorph B is exhibited by Co and Cu compounds. The Cr phase crystallizes as polymorphic form C and the Zn phase crystallizes as polymorph D. The Pb compound crystallizes in a new structure type designated as polymorph E. The transition metal crystal structures demonstrate a similar motive. OBi{sub 4} tetrahedra share edges to form two-dimensional Bi{sub 2}O{sub 2} layers that are spanned by PO{sub 4} tetrahedra and TO{sub 6-y} octahedra, pyramids and a trigonal bipyramid to form a three-dimensional network. Polymorph A crystallizes in space group C2; polymorph B is centrosymmetric with space group C2/c, the unit cell parameters differ and the unit cell volume is about double. Polymorph C crystallizes in space group P1-bar and polymorph D exhibits space group C2. Bi{sub 6.4}Pb{sub 0.6}P{sub 2}O{sub 15.2} can be considered as polymorph E, space group C2, with a new crystal structure but related stoichiometry. - Graphical abstract: View of Bi{sub 6.24}Cr{sub 0.09}P{sub 2}O{sub 14.4} perpendicular to [010].
- OSTI ID:
- 21128448
- Journal Information:
- Journal of Solid State Chemistry, Vol. 181, Issue 9; Other Information: DOI: 10.1016/j.jssc.2008.05.030; PII: S0022-4596(08)00260-0; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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