High pressure Raman scattering study on Sm2Mo4O15 system

被引：6

作者：

Santos, S. D. Silva ^{[1
]}

Paraguassu, W. ^{[1
]}

Maczka, M. ^{[2
]}

Freire, P. T. C. ^{[3
]}

机构：

[1] Fed Univ Para, Fac Fis, POB 479, BR-66075110 Belem, Para, Brazil

[2] Polish Acad Sci, Inst Low Temp & Struct Res, POB 1410, PL-50950 Wroclaw 2, Poland

[3] Univ Fed Ceara, Dept Fis, POB 6030, BR-60455900 Fortaleza, Ceara, Brazil

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2017年 / 174卷

关键词：

Hydrostatic pressure; Raman scattering; Molybdates; Negative thermal expansion; Pressure induced amorphization; Structural phase transition; Phonon calculation; NEGATIVE THERMAL-EXPANSION; INDUCED AMORPHIZATION; GD-2(MOO4)(3); CRYSTALS; DECOMPOSITION; TUNGSTATE; SPECTRA; STATE; PHASE; HO;

D O I：

10.1016/j.saa.2016.11.024

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

High-pressure Raman experiments were performed on Sm2Mo4O15 system up to 7.9 GPa. We show that this system exhibits an irreversible structural amorphization at 5.0 GPa. In contrast to any other molybdates and tungstates experiencing pressure-induced amorphization, this structural change in Sm2Mo4O15 has strongly first order character. This amorphous phase can be originated from the hindrance of a crystalline structural phase transition from the P (1) over bar to P2/m structure. Additionally, the assignment of Raman modes of the ambient pressure phase of Sm2Mo4O15 was proposed based on lattice dynamics calculations. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：80 / 85

页数：6

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