High-resolution Brillouin scattering studies of phase transitions in Ca2MgSi2O7 and Ca2ZnSi2O7 silicates

被引：4
作者：
Maczka, Miroslaw [1 ]
Hanuza, Jerzy [2 ]
Kaminskii, Alexander [3 ]
Kojima, Seiji [4 ]
机构：
[1] Polish Acad Sci, Inst Low Temp & Struct Res, PL-50950 Wroclaw 2, Poland
[2] Wroclaw Univ Econ, Fac Ind & Econ, Dept Bioorgan Chem, PL-53345 Wroclaw, Poland
[3] Russian Acad Sci, Inst Crystallog, Moscow 117333, Russia
[4] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 638卷
基金：
日本学术振兴会;
关键词：
Oxide materials; Phase transitions; Phonons; Acoustic properties; Inelastic light scattering; INCOMMENSURATE PHASE; OPTICAL-PROPERTIES; CASCADED CHI((3)); THERMAL-EXPANSION; HIGH-TEMPERATURE; LASER CRYSTAL; AKERMANITE; CA2COSI2O7; MELILITE; BA2ZNGE2O7;
D O I：
10.1016/j.jallcom.2015.03.055
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Temperature-dependent Micro-Brillouin scattering studies of Ca2MgSi2O7 and Ca2ZnSi2O7 single crystals were performed. Step-like decrease of Brillouin shifts and strong broadening of Brillouin bands corresponding to the c(33) elastic constant were observed at 351 K for Ca2MgSi2O7 and 407 K for Ca2ZnSi2O7. This behavior was attributed to coupling of strain to the square of the order parameter due to structural transitions into incommensurate phases. Analysis of the observed acoustic anomalies showed critical slowing down behavior of the relaxation time characterizing interaction between the order parameter and acoustic phonon. (C) 2015 Elsevier B.V. All rights reserved.
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页码：34 / 37
页数：4
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