Dielectric Properties of a Series  of  Perovskite La1-x-yCaxKyMnO3 Manganites

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (5): 1049.

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Dielectric Properties of a Series of Perovskite La_1-x-yCa_xK_yMnO₃ Manganites

Received:2010-08-17 Revised:2010-11-30 Online:2011-05-10 Published:2011-04-11
Contact: Shou-Hua FENG E-mail:shfeng@jlu.edu.cn
Supported by:
国家自然科学基金(批准号: 20631010, 90922034)资助.

Abstract

Abstract: A series of perovskite manganese oxides La1-x-yCaxKyMnO3 are synthesized from hydrothermal redox reaction, and they have La3+, Ca2+ and K+ three kinds of cations with different valences occupied at A site. The obtained samples are ground and pressed in discs, and the discs are then sintered to form a parallel-plate capacitor. At room temperature, the capacitance, the loss tangent and the resistance are measured as a function of frequency. We find that the real part of the complex relative dielectric permittivity varies considerably in different samples with the A-site cation size mismatch. The comparison of the resistance derived from experiment and calculation respectively indicates the equivalent circuit in intrinsic samples.

Key words: Perovskite, Dielectric constant, A-site cation size mismatch

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Dielectric Properties of a Series of Perovskite La_1-x-yCa_xK_yMnO₃ Manganites

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