ZnO掺杂对Ca0.25(Li0.43Sm0.57)0.75TiO3陶瓷烧结性能和微波介电性能的影响

doi:10.15541/jim20140359

摘要/Abstract

摘要：

采用溶胶-凝胶法制备Ca_0.25(Li_0.43Sm_0.57)_0.75TiO₃(CLST)微波介质陶瓷纳米粉体, 研究了ZnO掺杂量和烧结温度对CLST+ xmol% ZnO陶瓷烧结性能和微波介电性能的影响。XRD分析结果表明: 随着ZnO掺杂量x的增加, 陶瓷的晶体结构从正交相变为伪立方相, 并在x≥1.5的样品中出现了杂相。CLST+ xmol% ZnO陶瓷的致密化烧结温度随x的增加而降低, x=1.0的样品的致密化烧结温度比x=0的降低了200 ℃。介电常数ε_r和频率品质因数Qf 随x增加和烧结温度的升高具有最优值, 频率温度系数则单调降低。x=1.0的样品在1100 ℃烧结时具有优异的综合性能: ρ = 4.85 g/cm³, ε_r=102.8, Qf = 5424 GHz, τ_f = -8.2×10^-6/℃。表明ZnO掺杂的CLST陶瓷是一种很有发展潜力的微波介质陶瓷。

关键词: 溶胶-凝胶, CLST, 微波介质陶瓷, 致密化烧结

Abstract:

The Ca_0.25(Li_0.43Sm_0.57)_0.75TiO₃(CLST) ceramic nano-powder was prepared by Sol-Gel method. The influences of ZnO doping content and sintering temperature on sintering behavior and microwave dielectric properties of CLST ceramics were investigated. A phase transition from orthorhombic to pseudo cubic symmetry was identified by XRD analysis, and a impure phase was found in the x≥1.5 samples. The densification sintering temperature of the CLST+xmol% ZnO ceramics decrease with increasing ZnO doping content, and it reduces from 1300℃ to 1100℃ when the amount of ZnO doping increase from x=0 to x=1.0. The results also reveal that both the dielectric constant ε_r and the quality factor Qf possess a peak value with increasing ZnO doping content or sintering temperature, whereas the frequency temperature coefficient τ_f decrease monotonously. The x=1.0 sample sintered at 1100℃ for 2 h has optimal microwave dielectric properties: ρ = 4.85 g/cm³, ε_r= 102.8, Qf = 5424 GHz, τ_f =-8.2×10^-6/℃, respectively, which indicates that the CLST ceramic doped with 1.0mol% ZnO is a promising microwave dielectric ceramic.

Key words: Sol-Gel, CLST, microwave dielectric ceramic, densification sintering temperature

中图分类号:

TQ174

李海涛, 李谦, 闫焉服, 许荣辉. ZnO掺杂对Ca_0.25(Li_0.43Sm_0.57)_0.75TiO₃陶瓷烧结性能和微波介电性能的影响[J]. 无机材料学报, 2015, 30(4): 369-373.

LI Hai-Tao, LI Qian, YAN Yan-Fu, XU Rong-Hui. Effect of ZnO-doping on Sinterability and Microwave Dielectric Property of Ca_0.25(Li_0.43Sm_0.57)_0.75TiO₃ Ceramics[J]. Journal of Inorganic Materials, 2015, 30(4): 369-373.

图/表 6

图1 950 ℃煅烧4 h CLST陶瓷粉体颗粒的TEM照片

Fig. 1 TEM micrographs of CLST ceramic powders calcinated at 950 ℃ for 4 h before (a) and after (b) being dispersed

图2 CLST+ xmol% ZnO陶瓷的XRD图谱

Fig. 2 XRD patterns of the CLST+xmol% ZnO ceramics

图3 CLST+ xmol% ZnO陶瓷的密度-烧结温度曲线

Fig. 3 Bulk density vs sintering temperature of CLST+xmol% ZnO ceramics

图4 不同烧结温度下CLST+1.0mol% ZnO陶瓷断口SEM照片

Fig. 4 SEM photographs of CLST+1.0mol% ZnO ceramics sintered at different temperatures (a) 1050℃; (b) 1110℃; (c) 1150℃; (d) 1200℃

图5 不同ZnO掺杂量CLST陶瓷的介电常数(a)、频率品质因数(b)和频率温度系数(c)

Fig. 5 Dielectric constant (εr) (a), quality factor (Qf ) (b) and frequency temperature coefficient (τf) (c) of CLST+xmol% ZnO ceramics

图6 CLST+1.0mol% ZnO陶瓷的介电常数(a)、频率品质因数(b)和频率温度系数(c)随烧结温度的变化曲线

Fig. 6 Dielectric constant (εr) (a), quality factor (Qf ) (b) and frequency temperature coefficient (τf) (c) of CLST+1.0mol% ZnO ceramics sintered at different temperatures

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ZnO掺杂对Ca_0.25(Li_0.43Sm_0.57)_0.75TiO₃陶瓷烧结性能和微波介电性能的影响

Effect of ZnO-doping on Sinterability and Microwave Dielectric Property of Ca_0.25(Li_0.43Sm_0.57)_0.75TiO₃ Ceramics

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