Crystal Growth and Dielectric Properties of New Ferroelectric Barium Titanate: BaTi2O5

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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 (ε′) and dielectric loss tangent (tanδ) were measured in a wide temperature range of 10–860 K and in a frequency range of 0.1–3,000 kHz. The ε′ 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 ε′ and tanδ are compared between these three crystals consisting of two kinds of BaTi2O5 and one BaTiO3.

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