TY - JOUR
T1 - Structure of Cr2SiO4 and possible metal-metal interactions in crystal and melt
AU - Dollase, W. A.
AU - Seifert, F.
AU - O'Neill, H. St C.
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1994/5
Y1 - 1994/5
N2 - Cr2SiO4 has been prepared both as quench crystals and as an apparently stable subsolidus phase, at T=1600 and 1650 °C, P=37 kbar on Cr2SiO4 and Cr-SiO3 bulk compositions. Crystal structure determination by Rietveld analysis of X-ray powder data from 3 samples show the structure, in space group Fddd, to be related to that of Cd2SiO4 (thenardite Na2SO4-V structure) but with approximately “square planar” coordination of the Cr2+ (d4) atom. In one of the axial ligand positions, normal to the strongly bonded CrO4 equatorial plane, is found a Cr atom (Cr-Cr=2.75 Å). Stereochemistry permits this contact to be a weak metal-metal bond, though it cannot be ruled out to be a non-bonded result of polyhedral connectivity.
AB - Cr2SiO4 has been prepared both as quench crystals and as an apparently stable subsolidus phase, at T=1600 and 1650 °C, P=37 kbar on Cr2SiO4 and Cr-SiO3 bulk compositions. Crystal structure determination by Rietveld analysis of X-ray powder data from 3 samples show the structure, in space group Fddd, to be related to that of Cd2SiO4 (thenardite Na2SO4-V structure) but with approximately “square planar” coordination of the Cr2+ (d4) atom. In one of the axial ligand positions, normal to the strongly bonded CrO4 equatorial plane, is found a Cr atom (Cr-Cr=2.75 Å). Stereochemistry permits this contact to be a weak metal-metal bond, though it cannot be ruled out to be a non-bonded result of polyhedral connectivity.
UR - http://www.scopus.com/inward/record.url?scp=0028197757&partnerID=8YFLogxK
U2 - 10.1007/BF00205221
DO - 10.1007/BF00205221
M3 - Article
AN - SCOPUS:0028197757
SN - 0342-1791
VL - 21
SP - 104
EP - 109
JO - Physics and Chemistry of Minerals
JF - Physics and Chemistry of Minerals
IS - 1
ER -