High pressure Raman scattering study on Sm₂Mo₄O₁₅ system

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• 作者：S.D. Silva Santos^a ; W. Paraguassu^a ; ^{wparaguassu@pq.cnpq.br} ; M. Maczka^b ; P.T.C. Freire^c
• 关键词：Hydrostatic pressure ; Raman scattering ; Molybdates ; Negative thermal expansion ; Pressure induced amorphization ; Structural phase transition ; Phonon calculation
• 刊名：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
• 出版年：2017
• 出版时间：5 March 2017
• 年：2017
• 卷：174
• 期：Complete
• 页码：80-85
• 全文大小：1056 K
• 卷排序：174

文摘

High-pressure Raman experiments were performed on Sm2Mo4O15 system up to 7.9 GPa. This system exhibits a irreversible structural amorphization at 5.0 GPa. This structural change in Sm2Mo4O15 has strongly first-order character. The amorphous phase can be originated from the hindrance of a crystalline structural phase transition. Assignment of Raman modes of the ambient-pressure phase of Sm2Mo4O15 was proposed, based on lattice dynamics calculations.