Crystal structure of a new natural Mn, W-Tantaloniobate
- Moscow State Univ., Moscow (Russian Federation)
The crystal structure of a new natural Mn, W-tantaloniobate (Mn{sup 2+}{sub 1.76}Mn{sup 3+}{sub 0.1}Fe{sup 2+}{sub 0.1}{open_square}0.14)Nb{sub 0.8}Mn{sup 2+}{sub 0.2}{sub 2}(Nb{sub 2.0}Ta{sub 0.65}W{sub 0.1}{open_square}{sub 0.25})(W{sub 1.71}Ti{sub 0.09}{open_square}{sub 0.20})O{sub 20} discovered in the granite pegmatites of Southwestern Pamir was determined (Syntex P1 automated diffractometer; 20/0 scan; 1041 reflections; and R=0.054). Parameters of the monoclinic unit cell are: a=24.73(2){angstrom}, b=5.056(3){angstrom}, and c=5.760(3){angstrom}; {beta}=103.50(7){degrees}; V=700.5(9){angstrom}{sup 3}; sp. gr. P2{sub 1}, Z=2; and d{sub calc}=6.11 g/cm{sup 3}. The basic units of the structure are blocks of the {alpha}-PbO{sub 2} type that are formed of zigzag octahedral columns with Mn, Nb, and the columns formed by W triognal prisms. A comparative crystal-chemical analysis of the structures of a number of complex oxides of the {alpha}-PbO{sub 2} type was performed. 9 refs., 2 fig., 3 tab.
- OSTI ID:
- 255403
- Journal Information:
- Crystallography Reports, Vol. 40, Issue 3; Other Information: PBD: May-Jun 1995; TN: Translated from Kristallografiya; 40: No. 3, 469-475(1995)
- Country of Publication:
- United States
- Language:
- English
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