Some Aspects of Raman Scattering from A2BX4 Compounds
Since the development of ion lasers made Raman spectroscopy a routine analytical tool, it has been used extensively in studies of structural phase transitions in solids. Even though it is restricted in most cases to zero wavevector excitations, the effects of non-zero wavevector instabilities can also be evident in the spectra. It has also proved useful for the study of the incommensurate phase transitions that were the subject of this workshop. To illustrate how Raman scattering studies have contributed to a better understanding of incommensurate phases in ferroelectric insulators, we have selected for this article two quite different studies in which Raman scattering has provided new information about the incommensurate ferroelectrics, K2SeO4 and Rb2ZnCl4.
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