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High pressure Raman study of DyPO 4 at room and low temperatures
Author(s) -
Kontos A. G.,
Stavrou E.,
Malamos V.,
Raptis Y. S.,
Raptis C.
Publication year - 2007
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.200672521
Subject(s) - raman spectroscopy , logarithm , hydrostatic equilibrium , spectral line , hydrostatic pressure , low frequency , atmospheric temperature range , chemistry , analytical chemistry (journal) , thermodynamics , materials science , physics , mathematics , optics , quantum mechanics , mathematical analysis , chromatography , astronomy
The Raman spectra of DyPO 4 , under variable hydrostatic pressure at room‐ and low‐temperature (110 K), have been studied. Crossing, with increasing pressure, of two modes in the frequency range of the internal‐external border, is observed and discussed. At low temperature, the pressure dependence of the three highest‐frequency internal modes is monitored, which exhibit a (d ω /d P )‐slope differing, well beyond the experimental error, from the corresponding room temperature slopes. At room temperature, all the expected modes are observed and are divided in two distinct groups on a “logarithmic derivative” vs. “peak‐frequency” graph. This division is discussed in terms of the internal‐external mode‐character. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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