"Understanding microwave dielectric properties of (1−x)CaTiO<sub>3</sub" by Zhanming DOU, Gan WANG et al.

Article Title

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

Authors

Zhanming DOU, 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
Gan WANG, 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
Juan JIANG, 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
Fan 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
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

Keywords

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

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).

DOI

https://doi.org/10.1007/s40145-016-0212-2

Publisher

Tsinghua University Press

Recommended Citation

Zhanming DOU, Gan WANG, Juan JIANG 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.

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