Temperature-induced isostructural phase transition on NaCe(MoO4)2 system: A Raman scattering study

被引：17
|
作者：
Moura, J. V. B. [1 ]
Luz-Lima, C. [2 ]
Pinheiro, G. S. [2 ]
Freire, P. T. C. [1 ]
机构：
[1] Univ Fed Ceara, Dept Fis, Campus Pici,POB 6030, BR-60455970 Fortaleza, Ceara, Brazil
[2] Univ Fed Piaui, Dept Fis, Campus Minist Petronio Portella, BR-64049550 Teresina, PI, Brazil
来源：
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2019年 / 208卷
关键词：
Sodium-cerium molybdate; Temperature dependence; Raman scattering; Isostructural phase transition; HIGH-PRESSURE RAMAN; PHOTOLUMINESCENCE PROPERTIES; PHOTOCATALYTIC PROPERTIES; ACTIVE PHONONS; LUMINESCENCE; REFINEMENT; DEPENDENCE; SCHEELITE;
D O I：
10.1016/j.saa.2018.10.017
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
Temperature-dependent Raman spectroscopic study has been performed on scheelite-type sodium-cerium molybdate - NaCe(MoO4)(2) - in the temperature range 113-873 K. This study provides phonon properties of NaCe (MoO4)(2), which are very important to understand the mechanism governing eventual phase transitions undergone by the structure, since phonons are very sensitive to structural changes. The ambient scheelite phase remains stable in a low-temperature range (113-293 K), and no relevant modification is observed in the Raman spectra. However, the experiments reveal the existence of one reversible phase transition at high-temperature. The vibrational spectra of NaCe(MoO4)(2) system showed anomalies above 748 K, where overlaps of some bands and the appearance of a band at 458 cm(-1) are observed. These modifications were attributed to an isostructural phase transition and a discussion about the possible mechanism of this transformation is furnished. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：229 / 235
页数：7
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