SYMMETRY LOWERING DUE TO SITE-OCCUPATION DISORDER IN VIBRATIONAL-SPECTRA OF GEHLENITE, CA2(ALSI)ALO7

Authors
BURSHTEIN Z SHIMONY Y MORGAN S HENDERSON DO MU R SILBERMAN E
Citation
Z. Burshtein et al., SYMMETRY LOWERING DUE TO SITE-OCCUPATION DISORDER IN VIBRATIONAL-SPECTRA OF GEHLENITE, CA2(ALSI)ALO7, Journal of physics and chemistry of solids, 54(9), 1993, pp. 1043-1049
Citations number
13
Categorie Soggetti
Physics, Condensed Matter",Chemistry
Journal title
Journal of physics and chemistry of solids → ACNP
ISSN journal
00223697
Volume
54
Issue
9
Year of publication
1993
Pages
1043 - 1049
Database
ISI
SICI code
0022-3697(1993)54:9<1043:SLDTSD>2.0.ZU;2-C
Abstract
Raman scattering and i.r. reflectance spectra of a gehlenite crystal, Ca2(AlSi)AlO7, have been measured. The data clearly indicate a lowerin g of the crystal symmetry from D2d to S4 due to occupation disorder in one of the C(s) sites, which statistically accommodates either a Si o r an Al ion. Forty out of the 51 theoretically expected Raman active b ands, and 21 out of 35 expected i.r. bands have been resolved and assi gned.