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Journal of Advanced Ceramics 2017, 6(1): 20-26 https://doi.org/10.1007/s40145-016-0212-2
Research Article | Open Access | Issue | Published: 02 March 2017

Understanding microwave dielectric properties of (1−x)CaTiO3–xLaAlO3 ceramics in terms of A/B-site ionic-parameters

Show Author's Information Zhanming DOU†,  Gan WANG†,  Juan JIANG( ),  Fan ZHANG,  Tianjin ZHANG( )
Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials and School of Material Science and Engineering, Hubei University, Wuhan 430062, China

† These authors contributed equally to this work.

Keywords:
(1−x)CaTiO3–xLaAlO3 (CTLA) microwave dielectric ceramics, ionic polarizability, bond valence, cation rattling effect
Cite this article:
DOU Z, WANG G, JIANG J, et al. Understanding microwave dielectric properties of (1−x)CaTiO3–xLaAlO3 ceramics in terms of A/B-site ionic-parameters. Journal of Advanced Ceramics, 2017, 6(1): 20-26. https://doi.org/10.1007/s40145-016-0212-2
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Abstract Full text About this article

We prepared (1−x)CaTiO3–xLaAlO3 (0 ≤ x ≤ 1) microwave dielectric ceramics using a conventional two-step solid-state reaction method, and investigated microwave dielectric properties of the ceramics in terms of A/B-site ionic-parameters. Ionic-parameters such as ionic polarizability, A-site bond valence, and ionic rattling were linked to the microwave dielectric properties. As the LaAlO3 content x in the (1−x)CaTiO3–xLaAlO3 ceramics increased from 0.3 to 0.7, the dielectric constant gradually decreased, which was attributed to the decrease of polarizability deviation and suppression of the cation rattling. The temperature coefficient of the resonant frequency decreased as the content of LaAlO3 increased because of the increase of A-site cation bond valence. The quality factor value (Q × f) increased as LaAlO3 content increased because of the enhancement of the order degree of B-site cation. A significant deterioration of the temperature coefficient of the resonant frequency and Q × f value was observed at the composition x = 0.5. These decreases were attributed to a phase transition from orthorhombic crystal (for x ≤ 0.5) to rhombohedral crystal (for x > 0.5).


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About this article

Understanding microwave dielectric properties of (1−x)CaTiO3–xLaAlO3 ceramics in terms of A/B-site ionic-parameters

Show Author's information Zhanming DOU†, Gan WANG†, Juan JIANG( ), Fan ZHANG, Tianjin ZHANG( )
Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials and School of Material Science and Engineering, Hubei University, Wuhan 430062, China

† These authors contributed equally to this work.

Abstract

We prepared (1−x)CaTiO3–xLaAlO3 (0 ≤ x ≤ 1) microwave dielectric ceramics using a conventional two-step solid-state reaction method, and investigated microwave dielectric properties of the ceramics in terms of A/B-site ionic-parameters. Ionic-parameters such as ionic polarizability, A-site bond valence, and ionic rattling were linked to the microwave dielectric properties. As the LaAlO3 content x in the (1−x)CaTiO3–xLaAlO3 ceramics increased from 0.3 to 0.7, the dielectric constant gradually decreased, which was attributed to the decrease of polarizability deviation and suppression of the cation rattling. The temperature coefficient of the resonant frequency decreased as the content of LaAlO3 increased because of the increase of A-site cation bond valence. The quality factor value (Q × f) increased as LaAlO3 content increased because of the enhancement of the order degree of B-site cation. A significant deterioration of the temperature coefficient of the resonant frequency and Q × f value was observed at the composition x = 0.5. These decreases were attributed to a phase transition from orthorhombic crystal (for x ≤ 0.5) to rhombohedral crystal (for x > 0.5).

Keywords: (1−x)CaTiO3–xLaAlO3 (CTLA) microwave dielectric ceramics, ionic polarizability, bond valence, cation rattling effect

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Publication history

Received: 04 September 2016
Revised: 10 September 2017
Accepted: 10 November 2017
Published: 02 March 2017
Issue date: March 2017

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© The author(s) 2016

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Open Access The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons. org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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