Synthesis and crystal structure of a magnesium--lithium--scandium protopyroxene
- Los Alamos Scientific Lab., NM
Crystals of protopyroxene solid solution, Li/sub x/Sc/sub x/Mg/sub 2-x/Si/sub 2/O/sub 6/, 0.1 equal to or less than x equal to or less than 0.35, were grown, in solvents of the system Li/sub 2/O-V/sub 2/O/sub 5/-MoO/sub 3/, by cooling from 1350 to 650/sup 0/ at 1.5/sup 0/C per hour. The crystals are transparent, euhedral, and prismatic, elongate parallel to c and up to 15 x 4 x 3 mm in size, with well-developed (010), (110), and (121) faces. The cell edges used for structure analysis are: a = 9.251, b = 8.773, and c = 5.377A. Long-exposure x-ray precession photographs showed no diffraction maxima inconsistent with space group Pbcn and no evidence of stack disorder. The crystal structure was refined from 1507 measured x-ray intensities, of which 826 were greater than 3sigma of the background intensity. Refinements of the structure in space groups P2/sub 1/cn, Pb2n, Pbc2/sub 1/, and P2/c yielded structures which did not differ significantly from that in space group Pbcn. The structure is ordered with all of the Sc/sup 3 +/ in M1 and all of the Li/sup +/ in M2.
- OSTI ID:
- 5308635
- Journal Information:
- Am. Mineral.; (United States), Vol. 62:11/12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
LITHIUM COMPOUNDS
LATTICE PARAMETERS
SYNTHESIS
MAGNESIUM COMPOUNDS
OXYGEN COMPOUNDS
SCANDIUM COMPOUNDS
SILICON COMPOUNDS
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
400201* - Chemical & Physicochemical Properties