Preparation and Property of High Entropy (La0.2Li0.2Ba0.2Sr0.2Ca0.2)TiO3 Perovskite Ceramics

doi:10.15541/jim20200500

Abstract

Abstract:

High entropy ceramic is a kind of ceramic developed based on the high entropy alloy in recent years. The appearance of high entropy ceramics provides a new concept and route for developing non-metallic materials with excellent properties. In present work, a series of high-entropy ceramics with a molar ratio of A site—(La_0.2Li_0.2Ba_0.2Sr_0.2Ca_0.2)TiO₃ were successfully synthesized by solid state reaction. The effects of sintering temperature on phase, microstructure and electric properties were investigated. Results show that the high-entropy ceramics sintered at current temperatures are of cubic perovskite structure, and exhibit excellent insulation, with low leakage current density of J value around 10^-8-10^-6 A/cm². Although the grain size increases with the increase of sintering temperature, the correlation between microstructure and dielectric properties of (La_0.2Li_0.2Ba_0.2Sr_0.2Ca_0.2)TiO₃ ceramics is not significant. The dielectric constant reaches its maximum value at 1350 ℃, with the value of 230 at the frequency of 100 Hz. Meanwhile, this high-entropy ceramic has relaxation behavior, and the relaxation peak of the permittivity moves towards high temperature with the increase of frequency.

Key words: high-entropy ceramics, perovskite, dielectric property

CLC Number:

TQ174

ZHANG Xiaoyan, LIU Xinyue, YAN Jinhua, GU Yaohang, QI Xiwei. Preparation and Property of High Entropy (La_0.2Li_0.2Ba_0.2Sr_0.2Ca_0.2)TiO₃ Perovskite Ceramics[J]. Journal of Inorganic Materials, 2021, 36(4): 379-385.

Figures/Tables 8

Fig. 1 XRD patterns of high entropy (La0.2Li0.2Ba0.2Sr0.2Ca0.2) TiO3 ceramic sintered at different temperatures

Fig. 2 HRTEM image of high entropy (La0.2Li0.2Ba0.2Sr0.2Ca0.2) TiO3 ceramic sintered at 1350 ℃

Fig. 3 SEM images of high entropy (La0.2Li0.2Ba0.2Sr0.2Ca0.2)TiO3 ceramic sintered at different temperatures (a) 1250 ℃; (b) 1300 ℃; (c) 1350 ℃; (d)1400 ℃; (e) 1450 ℃; (f) 1500 ℃

Fig. 4 Variation of density and relative density of high entropy (La0.2Li0.2Ba0.2Sr0.2Ca0.2)TiO3 ceramic sintered at different temperatures

Fig. 5 (a) Ti2p and (b) O1s XPS spectra of (La0.2Li0.2Ba0.2Sr0.2Ca0.2)TiO3 ceramic

Fig. 6 Frequency dependences of dielectric constant εr (a) and dielectric loss tanδ (b) of (La0.2Li0.2Ba0.2Sr0.2Ca0.2)TiO3 ceramic

Fig. 7 Temperature dependence of dielectric constant and dielectric loss of (La0.2Li0.2Ba0.2Sr0.2Ca0.2)TiO3 ceramic sintered at 1350 ℃

Fig. 8 Leakage current density of (La0.2Li0.2Ba0.2Sr0.2Ca0.2)TiO3 ceramics sintered at different temperatures (a) J-E curves; (b) lnJ-lnE curves

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Preparation and Property of High Entropy (La_0.2Li_0.2Ba_0.2Sr_0.2Ca_0.2)TiO₃ Perovskite Ceramics

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