Effect of sintering temperature on the structure and electrical properties of KNNS-0.03BNZ ceramics

IF 1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Digest Journal of Nanomaterials and Biostructures Pub Date : 2023-07-20 DOI:10.15251/djnb.2023.183.813

H. W. Zhao, Yang Li, R. Zhao, Z. Li

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Abstract

(K0.48Na0.52)NbO3-0.03Bi0.5Na0.5ZrO3 (KNNS-0.03BNZ) ceramics were prepared doped with 3 mol% Bi0.5Na0.5ZrO3 (BNZ), and the effect of sintering temperature on dielectric and piezoelectric properties of KNNS-0.03BNZ was also investigated. KNNS-0.03BNZ ceramics at all sintering temperatures exhibit a single perovskite structure, and the change of sintering temperature has no significant effect on the phase composition of KNNS 0.03BNZ ceramics. The Raman shifts of the ν1 and ν5 vibration modes have irregular changes in all sintering temperature ranges, indicating that there are polycrystalline phases coexisting in this region. With the change of sintering temperature, Tc slightly shifts to the high temperature direction, and TR-T slightly shifts to the high temperature direction, dielectric constant εr continuously increases, while dielectric loss tanδ firstly decreasing and then increasing. Thanks to the presence of a small amount of liquid phase in the ceramics sintered at 1160 ℃, piezoelectric coefficient d33 reaches 280 pC/N.

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烧结温度对KNNS-0.03BNZ陶瓷结构和电性能的影响

采用3mol % Bi0.5Na0.5ZrO3 (BNZ)掺杂制备了(K0.48Na0.52)NbO3-0.03Bi0.5Na0.5ZrO3 (KNNS-0.03BNZ)陶瓷，并研究了烧结温度对KNNS-0.03BNZ介电和压电性能的影响。各烧结温度下KNNS-0.03BNZ陶瓷均呈现单一钙钛矿结构，烧结温度的变化对KNNS-0.03BNZ陶瓷的相组成无显著影响。ν1和ν5振动模式的拉曼位移在各烧结温度范围内均呈不规则变化，表明该区域存在多晶相共存。随着烧结温度的变化，Tc略有向高温方向偏移，TR-T略有向高温方向偏移，介电常数εr不断增大，介电损耗tanδ先减小后增大。由于1160℃烧结陶瓷中存在少量液相，压电系数d33可达280 pC/N。

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