Crystal Growth and Dielectric Properties of New Ferroelectric Barium Titanate: BaTi2O5 |
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Authors: | Yukikuni Akishige Katsuhiro Fukano Hirotake Shigematsu |
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Affiliation: | (1) Faculty of Education, Shimane University, Matsue Shimane, 690-8504, Japan;(2) Present address: Tsuwano High School, Tsuwanocho Shimane, 699-6505, Japan |
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Abstract: | Single crystals of the ferroelectric BaTi2O5 and BaTiO3 were prepared from a solution of 33-mol% BaO and 67-mol% TiO2 by a rapid cooling method. The dielectric constant () and dielectric loss tangent (tan) were measured in a wide temperature range of 10–860 K and in a frequency range of 0.1–3,000 kHz. The along the b-axis of the BaTi2O5 crystal, prepared in air, shows a sharp dielectric anomaly reaching 30,000 at the ferroelectric Curie temperature of TC = 752 K. By contrast, the crystal prepared in a reducing atmosphere shows a diffuse phase transition near TC = 703 K. The values of and tan are compared between these three crystals consisting of two kinds of BaTi2O5 and one BaTiO3. |
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Keywords: | BaTi2O5 BaTiO3 ferroelectrics high Curie temperature high dielectric constant |
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