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b-axis-oriented CaO substituted polycrystalline BaTi2O5 ,B a 1 xCaxTi2O5 (BCT2, x ¼ 0 to 0.10), was prepared by arc melting. The dielectric property of BCT2 was investigated by an AC impedance method. The lattice parameters of BCT2 decreased with increasing CaO content in the range up to around x ¼ 0:08. The remnant polarization (Pr) and coercive electric field (Ec) of polycrystalline BCT2 at x ¼ 0:08 were 1:6  10  2 Cm  2 and 0:4  10 6 Vm  1 , respectively. The Pr of polycrystalline BCT2 was larger than that of BaTi2O5 (BT2, Pr ¼ 0:9  10  2 Cm  2 ), while the Ec of BCT2 was smaller than that of polycrystalline BT2 (Ec ¼ 0:7  10 6 Vm  1 ). The permittivity of BCT2 showed the maximum value of 4950 at x ¼ 0:02 and a Curie temperature (Tc) of 736 K. The Tc of BCT2 decreased from 750 to 665 K with increasing CaO content from 0 to 0.10. [doi:10.2320/matertrans.MRA2008333]

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Dielectric Properties of Ba&lt;SUB&gt;1&amp;minus;&lt;I&gt;x&lt;/I&gt;&lt;/SUB&gt;Ca&lt;I&gt;&lt;SUB&gt;x&lt;/SUB&gt;&lt;/I&gt;Ti&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;5&lt;/SUB&gt; Prepared by Arc Melting