G. Vanhoyland, F. Bourée, M. K. Bael
Mar 1, 2001
Citations
0
Influential Citations
9
Citations
Journal
IEEE Journal of Solid-state Circuits
Abstract
The structure of acid strontium oxalate Sr(HC{sub 2}O{sub 4}){center_dot}1/2(C{sub 2}O{sub 4}){center_dot}H{sub 2}O has been determined by conventional X-ray powder diffractometry. The diffraction pattern was indexed from a monoclinic unit cell with cell parameters a=6.341(1) {angstrom}, b=16.880(2) {angstrom}, c=5.7798(8) {angstrom}, and {beta}=97.60(1){degree}; space group, P2{sub 1}/n (No. 14) with Z=4. Final (isotropic) Rietveld refinement of the neutron powder data yielded R{sub B}=4.57%, R{sub F}=2.87%, and R{sub wp}=7.87% as conventional Rietveld parameters. Strontium is eight-fold coordinated and can be described as a distorted bicapped trigonal prism. The SrO{sub 8} polyhedra form one-dimensional chains along the c-axis by sharing edges. In contrast to all other known strontium oxalates, in this compound H{sub 2}O acts as bridging ligand between two Sr atoms. SDPD-D classification (1): Sr(HC{sub 2}O{sub 4})- 1/2(C{sub 2}O{sub 4})-H{sub 2}O, P2{sub 1}/n, C1=14, Nc=42, C2=11, XC1+N/TREOR-97 and DICVOL-91, EXTRA, EQUI, SIRPOW-92 (DM), GFOURIER, FULLPROF.