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Published in: Journal of Materials Science 23/2021

29-04-2021 | Electronic materials

Temperature-stable and ultralow-loss (1 − x)CaSmAlO4xSr2TiO4 microwave dielectric solid-solution ceramics

Authors: Xiaokai Liu, Lei He, Mengxin Yu, Ruzhong Zuo

Published in: Journal of Materials Science | Issue 23/2021

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Abstract

The (1 − x)CaSmAlO4xSr2TiO4 (0.01 ≤ x ≤ 0.06) microwave dielectric ceramics were for the first time prepared by a conventional solid-state method. The phase composition, sintering behavior, microstructure and microwave dielectric properties were investigated as function of sintering temperature and composition. A single-phase solid solution with K2NiF4-type tetragonal structure was formed in the range of 0.02 ≤ x ≤ 0.06. All samples are well densified with very little pores. The addition Sr2TiO4 greatly improves dielectric properties originally by restraining the secondary phase and then deteriorates Q × f value because of decreasing tolerance factor. Moreover, the τf value dominated by the thermal expansion coefficient increases lineally as x rises. Finally, excellent microwave dielectric properties of εr ~ 18.1, Q × f ~ 140,433 GHz (8.5 GHz), and a near-zero τf ~  + 0.05 ppm/°C can be obtained in the x = 0.05 ceramic sintered at 1425 °C.

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Metadata
Title
Temperature-stable and ultralow-loss (1 − x)CaSmAlO4–xSr2TiO4 microwave dielectric solid-solution ceramics
Authors
Xiaokai Liu
Lei He
Mengxin Yu
Ruzhong Zuo
Publication date
29-04-2021
Publisher
Springer US
Published in
Journal of Materials Science / Issue 23/2021
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-021-06124-5

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