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Open AccessArticle

Sinterability and Dielectric Properties of LiTaO3-Based Ceramics with Addition of CoO

School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
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Materials 2020, 13(7), 1506; https://doi.org/10.3390/ma13071506 (registering DOI)
Received: 3 March 2020 / Revised: 22 March 2020 / Accepted: 24 March 2020 / Published: 25 March 2020
Lithium tantalite (LiTaO3) is a common piezoelectric and ferroelectric crystal, but the LiTaO3 polycrystalline ceramics have rarely been reported, and their refractory character presents difficulties in their fabrication. In this study, LiTaO3-based ceramics with different amounts of CoO were prepared by pressureless sintering at 1250 °C, and the effects of the amount of sintering aid on the sinterability, microstructure, and dielectric properties of the ceramics were investigated. The relative densities of the LiTaO3-based ceramics were significantly improved by the addition of CoO powder. The LiTaO3-based ceramics achieved the highest relative density (89.4%) and obtained a well-grained microstructure when the added amount of CoO was 5 wt.%. Only the LiTaO3 phase in the ceramics was observed, indicating that the ions Co diffused into the LiTaO3 lattices and mainly existed in two forms: Co2+ and Co3+. The effects of the added amount of CoO on the dielectric properties of the LiTaO3-based ceramics were studied thoroughly. Consequently, the dielectric constant was enhanced, and the dielectric loss decreased in the LiTaO3-based ceramics with the addition of CoO. The optimal value was obtained at 5 wt.% of CoO-added LiTaO3-based ceramics.
Keywords: LiTaO3 ceramics; cobaltous oxide; microstructure; dielectric properties LiTaO3 ceramics; cobaltous oxide; microstructure; dielectric properties
MDPI and ACS Style

Zhang, Y.; Yao, Y.; He, S. Sinterability and Dielectric Properties of LiTaO3-Based Ceramics with Addition of CoO. Materials 2020, 13, 1506.

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