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Applications of a Point Polarizable Ion Model to Suzuki Phase Precipitates in Alkali Halides
Author(s) -
de Andrés A.
Publication year - 1988
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221500105
Subject(s) - phonon , halide , alkali metal , ion , raman spectroscopy , materials science , polarizability , condensed matter physics , phase (matter) , relaxation (psychology) , chemistry , inorganic chemistry , physics , optics , organic chemistry , molecule , social psychology , psychology
Abstract Lattice energy and phonon frequencies are calculated for the Suzuki phase (SP) precipitates in several materials. The dependences of the phonon frequencies versus pressure, anion relaxation, and the size of the precipitates are calculated in order to simulate the heat treatments effects on A 1g and T 2g, 1 modes observed by Raman spectroscopy. The observed changes seem to be due to the variation of some SP parameters and to the confinement of the phonons to an estimated size of the precipitates of about 4.5 nm.