Broad-band dielectric spectroscopy of Ba2NaNb5O15 single crystal

被引：9

作者：

Buixaderas, E ^{[1
]}

Porokhonskyy, V ^{[1
]}

Paskhin, A ^{[1
]}

Savinov, M ^{[1
]}

Petzelt, J ^{[1
]}

机构：

[1] ASCR, Inst Phys, Prague 18221 8, Czech Republic

来源：

EUROPEAN PHYSICAL JOURNAL B | 2002年 / 30卷 / 03期

关键词：

D O I：

10.1140/epjb/e2002-00385-4

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Barium sodium niobate (BNN) single crystals are studied by IR spectroscopy, time-domain THz transmission spectroscopy, HF coaxial wave-guide technique and LF dielectric spectroscopy to cover the frequency range 10(2)-10(14) Hz in a wide temperature interval. The dielectric response parallel and perpendicular to the polar c-axis is discussed. The ferroelectric transition at T-c = 830 K is driven by a relaxational soft mode coupled with another central-mode type relaxation which both gradually disappear on cooling in the ferroelectric phase. Below T-i the parameters of the expected IR active amplitudon were estimated. The low-temperature permittivity increase on cooling for the Eperpendicular toc field direction has been explained by an incipient proper ferroelectric-ferroelastic transition driven by an IR and Raman active B-2-symmetry soft mode.

引用

页码：319 / 329

页数：11

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