New ferroelectric BaTi2O5

被引：108
|
作者：
Akishige, Y [1 ]
Fukano, K [1 ]
Shigematsu, H [1 ]
机构：
[1] Shimane Univ, Fac Educ, Matsue, Shimane 6908504, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 2003年 / 42卷 / 8A期
关键词：
BaTi2O5; high Curie temperature; high dielectric constant; ferroelectrics; D-E loop; space group;
D O I：
10.1143/JJAP.42.L946
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A needle-shaped BaTi2O5 crystal was grown from a Ti-rich solution. The chemical composition of the crystal was analyzed by an electron probe micro-analyzer (EPMA). X-ray Weissenberg photographs were taken at room temperature (RT): the crystal is monoclinic with a = 16.91 Angstrom, b = 3.94 Angstrom, c = 9.49 Angstrom, beta = 103.0degrees and Z = 6. A broad and large dielectric anomaly reaching 30,000 was observed at 430degreesC for the dielectric constant along the b-axis. Also, spontaneous polarization was estimated to be approximately 7 muC/cm(2) from the D-E loops at RT. Thus the crystal is a new ferroelectric substance with a high Curie temperature of 430degreesC and the space group C-2 at RT.
引用
收藏
页码：L946 / L948
页数：3
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