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Structure and Dielectric Properties of Bi₄Pb_1.5Ti_4.5O_16.5 and Bi₅Ca_0.5GaTi_3.5O_16.5

Author： Shuvaev A. Vlasenko V. Drannikov D. Zarubin I.

Publisher： MAIK Nauka/Interperiodica

ISSN： 0020-1685

Source： Inorganic Materials, Vol.41, Iss.10, 2005-10, pp. : 1085-1088

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

New polycrystalline Bi-containing layered perovskite-like oxides (Aurivillius phases) Bi₄Pb_1.5Ti_4.5O_16.5 and Bi₅Ca_0.5GaTi_3.5O_16.5 were synthesized, and their lattice parameters were determined by x-ray powder diffraction. Both compounds have orthorhombic structures (sp. gr. Cmm2 = D _2v¹¹ , no. 35), with a = 5.4434(1) Å, b = 5.4506(1) Å, and c = 45.527(2) Å in Bi₄Pb_1.5Ti_4.5O_16.5 and a = 5.3868(7) Å, b = 5.4185(8) Å, and c = 45.267(8) Å in Bi₅Ca_0.5GaTi_3.5O_16.5. Their dielectric properties were studied between room temperature and 1200 K at frequencies from 1 to 50 kHz. Both compounds were shown to be ferroelectrics. Their Curie temperatures are 805 and 844 K, respectively.

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