Mn, Mg, and Zn ilmenite group titanates: A reconnaissance rietveld study
- Russian Academy of Sciences, Geological Institute, Kola Science Center (Russian Federation)
Ecandrewsite-geikielite (Zn{sub 1/2}Mg{sub 1/2}TiO{sub 3}), ecandrewsite-pyrophanite (Zn{sub 1/2}Mn{sub 1/2}TiO{sub 3}), pyrophanite-geikielite (Mg{sub 1/2}Mn{sub 1/2}TiO{sub 3}), and ecandrewsite-pyrophanite-geikielite (Zn{sub 1/3}Mn{sub 1/3}Mg{sub 1/3}TiO{sub 3}) titanates were synthesized at 900-1000 deg. C at ambient pressure. All of the compounds adopt R- ilmenite-type structures. These structures were refined by the Rietveld method from X-ray powder diffraction data. Unit cell parameters and unit cell volumes decrease with decreasing average radii of the A{sup 2+} cation. All structures consist of distorted AO{sub 6} and TiO{sub 6} octahedra. In common with pyrophanite and ilmenite, the distortion of the AO{sub 6} octahedra is less than that of the TiO{sub 6} octahedra. Data are given for the volumes and distortion indexes of all coordination polyhedra.
- OSTI ID:
- 21091487
- Journal Information:
- Crystallography Reports, Vol. 51, Issue 3; Other Information: DOI: 10.1134/S1063774506030047; Copyright (c) 2006 Nauka/Interperiodica; Article Copyright (c) 2006 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7745
- Country of Publication:
- United States
- Language:
- English
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