Thermal and Dielectric Properties of a New Ferroelectric LaBGeO5

Thermal and Dielectric Properties of a New Ferroelectric LaBGeO5
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新型铁电 LaBGeO5 的热性能和介电性能

DOI:
10.1143/jpsj.62.4311
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发表时间:
1993
影响因子:
1.7
通讯作者:
Y. Uesu
Y. Uesu
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
A. Onodera;B. Strukov;A. Belov;S. Taraskin;H. Haga;H. Yamashita;Y. Uesu

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研究了一种新型铁电材料LaBGeO 5的热性能和介电性能。在802.5K处,比热Cp有明显的反常(Δ S = 0.114R)。根据朗道理论确定了基本热力学参数。然而,一个额外的驼峰在C p被发现在一个不同的样品刚刚高于Tc。介电常数的测量证实了这种依赖于样品。新的中间相的出现可能是由一些杂质或缺陷引起的。Rhodes-Wohlfarth图表明相变的性质是位移型的。
Thermal and dielectric properties of LaBGeO 5 , a new ferroelectric with a stillwellite-type structure are investigated. The specific heat, C p , shows one clear anomaly (Δ S =0.114 R) at 802.5 K. The basic thermodynamic parameters are determined on the basis of the Landau theory. However, an additional hump in C p was found in a different sample just above T c . This dependence on samples is confirmed by the measurements of dielectric constants. The appearance of the new intermediate phase may be caused by some impurities or defects. The Rhodes-Wohlfarth plot suggests that the nature of the phase transitions is of the displacive-type.
DOI: --
发表时间: 2005
期刊: J.Korean Phys.Soc. 46
影响因子: --
作者:
Y.Akishige;H.Shigematsu;A.Kitahara;I.Takahashi
通讯作者: I.Takahashi