Phase transitions and the heat capacity anomalies in ferroelectric Li2Ge7O15 and LiNaGe4O9

被引：15
|
作者：
Morikawa, K
Atake, T
Wada, M
Yamaguchi, T
机构：
[1] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan
[2] Shinshu Univ, Fac Sci, Dept Phys, Matsumoto, Nagano 3908621, Japan
[3] Iwaki Meisei Univ, Coll Sci & Engn, Dept Elect Engn, Hino, Tokyo 1918506, Japan
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1998年 / 67卷 / 06期
关键词：
ferroelectricity; Li2Ge7O15; LiNaGe4O9; heat capacity;
D O I：
10.1143/JPSJ.67.1994
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The heat capacity of Li2Ge7O15 and LiNaGe4O9 was measured by adiabatic calorimetry between 13 and 300K. A typical second-order type of anomaly due to the ferroelectric phase transition was observed at 282.4K for Li2Ge7O15 and at 121.6K for LiNaGe4O9, and the entropy of transition was determined as 1.50 and 1.95 JK(-1)mol(-1), respectively. Smoothed heat capacity values at selected temperatures and some other thermodynamic functions such as enthalpy, entropy and Gibbs energy were calculated from the experimental data and tabulated in a table.
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收藏
页码：1994 / 1998
页数：5
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