Ordering and symmetry effects in RbLiSO4: A Raman study
- 2 October 1989
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 1 (39) , 6951-6958
- https://doi.org/10.1088/0953-8984/1/39/005
Abstract
Ordering effects in RbLiSo4 have been studied using Raman scattering. The Raman spectra obey monoclinic selection rules below 439 K only, suggesting that a complete monoclinic order appears in this temperature range (in connection with birefringence results), while above 439 K the various existing phases (even when monoclinic) behave, from a Raman point of view, as if they were subjected to an orthorhombic disorder. Nevertheless, precursor effects in the high temperature phases have been detected through weak, broad and theoretically forbidden lines which are tentatively interpreted as arising from a pseudo-second-order Raman effect.Keywords
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