Lattice modes in paraelectric La1/2Na1/2TiO3 by infrared and Raman spectroscopy

被引：4

作者：

Borodavka, F. ^{[1
]}

Simon, E. ^{[1
]}

Gregora, I. ^{[1
]}

Kamba, S. ^{[1
]}

Haumont, R. ^{[2
,3
]}

Hlinka, J. ^{[1
]}

机构：

[1] Acad Sci Czech Republ, Inst Phys, Prague 18221 8, Czech Republic

[2] Univ Paris 11, Lab Physicochim Etat Solide, Orsay, France

[3] Ecole Cent Paris, CNRS UMR8580, Lab Struct Proprietes & Modelisat Solides, Chatenay Malabry, France

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2013年 / 25卷 / 08期

关键词：

QUANTUM PARAELECTRICITY; PHASE-TRANSITIONS; TEMPERATURE;

D O I：

10.1088/0953-8984/25/8/085901

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The lattice dynamics of La1/2Na1/2TiO3 single crystal have been investigated by far-infrared and Raman scattering spectroscopy. Far-IR reflectivity spectra revealed Slater, Last and Axe modes near 140, 190 and 555 cm(-1), respectively. The frequency of the Slater mode decreases by about 10% on cooling, which is enough to account for the observed increase of the low-frequency permittivity. The results allowed us to discuss the reasons for the suppressed ferroelectricity of the material. Temperature evolution of the Raman scattering intensity of an oxygen octahedra bending mode near 455 cm(-1) suggests a second-order phase transition towards the perovskite aristotype phase near 870 K.

引用

页数：4

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