Preparation of (La0.2Nd0.2Sm0.2Gd0.2Er0.2)2Zr2O7 High-entropy Transparent Ceramics by Vacuum Sintering

doi:10.15541/jim20200367

Abstract

Abstract:

High-entropy ceramic is a hot topic in the recent study of ceramic materials. High-entropy ceramics with excellent properties is the development trend of ceramic materials. In this research, high-entropy transparent ceramic was synthesized by combustion method combined with vacuum sintering. The result indicates that the mean grain size of high-entropy (La_0.2Nd_0.2Sm_0.2Gd_0.2Er_0.2)₂Zr₂O₇ powder is about 8 nm. And the high-entropy powder is disordered deficient fluorite structure. The final transparent ceramics sintered in vacuum furnace at different temperatures exhibit ordered pyrochlore structure. Sintering temperature has little effect on the transmittance of ceramics. And the in-line transmittance of as-prepared transparent ceramic can reach 74% at 1730 nm. There are many absorption peaks in the transmittance spectrum. With the increase of sintering temperature, the body density and grain size of ceramics increase, but the HV hardnesses decrease.

Key words: high-entropy, transparent ceramic, pyrochlore

CLC Number:

TQ174

ZENG Jianjun, ZHANG Kuibao, CHEN Daimeng, GUO Haiyan, DENG Ting, LIU Kui. Preparation of (La_0.2Nd_0.2Sm_0.2Gd_0.2Er_0.2)₂Zr₂O₇ High-entropy Transparent Ceramics by Vacuum Sintering[J]. Journal of Inorganic Materials, 2021, 36(4): 418-424.

Figures/Tables 5

Fig. 1 TEM images of high-entropy powder after calcination

Fig. 2 XRD patterns (a) and Raman spectra (b) of calcined powder and high-entropy ceramics sintered at different temperatures

Fig. 3 SEM images of final high-entropy ceramics after hot corrosion (a, d, g), SEM images of fractured final high-entropy ceramics (b, e, h), histograms of grain distribution (c, f, i) of final high-entropy ceramics

Fig. 4 Transmission spectra and photo of high-entropy transparent ceramics sintered at different temperatures

Fig. 5 Grain sizes, Vickers hardnesses and bulk densities of high-entropy transparent ceramics sintered at different temperatures

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Preparation of (La_0.2Nd_0.2Sm_0.2Gd_0.2Er_0.2)₂Zr₂O₇ High-entropy Transparent Ceramics by Vacuum Sintering

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