ULTRASONIC STUDY NEAR THE FERRO-PARAELECTRIC PHASE-TRANSITION IN (CH3NH3)5BI2CL11 AND (CH3NH3)5BI2BR11 CRYSTALS

被引：8

作者：

JAKUBAS, R ^{[1
]}

LEFEBVRE, J ^{[1
]}

FONTAINE, H ^{[1
]}

FRANCOIS, P ^{[1
]}

机构：

[1] UNIV LILLE 1, UFR PHYS, STRUCT & PROPRIETES ETAT SOLIDE LAB, UA 234, F-59655 VILLENEUVE DASCQ, FRANCE

来源：

SOLID STATE COMMUNICATIONS | 1992年 / 81卷 / 06期

关键词：

D O I：

10.1016/0038-1098(92)90603-7

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The temperature dependence of the elastic stiffness coefficients c(aa), c(bb) and c(cc) of (CH3NH3)5Bi2Cl11 and (CH3NH3)5Bi2Br11 single crystals have been measured near the para-ferroelectric phase transition using the ultrasonic technique. It was found that the anomalous part of the ultrasonic velocities DELTA-upsilon(bb) (b-axis) and DELTA-upsilon(cc), (c-polar axis) are proportional to log (T - T(c)). This type of the critical behaviour is the same as the usual ferroelectrics.

引用

页码：515 / 519

页数：5

共 26 条

[1]

BHATTACHARJEE R, 1990, FERROELECTRICS LETT, V12, P79, DOI 10.1080/07315179008201131

[2]

CARPENTIER P, UNPUB J PHYS CONDENS

[3] PHENOMENOLOGICAL THEORY OF ULTRASONIC ATTENUATION IN FERROELECTRICS [J].