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|Type:||Artigo de periódico|
|Title:||Raman Study Of The - Cristobalite Phase Transition In Aipo4|
|Abstract:||The Raman spectra of small single crystals of the cristobalite form of aluminum phosphate (AIPO4) have been obtained in both the and phase. Particular emphasis has been placed on the behavior of the phonons near the phase-transition temperature. The transition is first order, but the latent heat and discontinuity in lattice parameters are small enough to permit cycling of the sample through the transition without damage. A soft mode is observed which has energy 102 cm-1 at ambient temperatures. The observed spectra confirm the assignments of space groups C222 (D25) and I4m2 (D2d9) for the and phases, respectively. Phonon comparisons are made with isomorphic BPO4 and SiO2. © 1978 The American Physical Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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