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|Type:||Artigo de periódico|
|Title:||Intrinsic Anharmonicities In The Bx4 2- Orthorhombic Sublattice|
|Abstract:||We have measured the room-temperature polarized Raman spectra of the internal modes of K2SO4 and K2SeO4 under hydrostatic pressure up to 10 GPa in a backscattering configuration. It was found that phonons involving the motion of selenium atoms have distinctive pseudoanharmonicities that can be traced to isotopic natural abundances. Accordingly, a reinterpretation is given to the origin of the fourth-order anharmonicity (g4 coupling constant) within the quartic potential formalism as representing dynamical isotopic effects in the cluster picture. We found that this analysis may be extended to other molecular systems with either phonon instabilities or order-disorder commensurate- incommensurate phase transitions. © 1986 The American Physical Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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