Effect of ZnO-doping on Sinterability and Microwave Dielectric Property of Ca0.25(Li0.43Sm0.57)0.75TiO3 Ceramics

doi:10.15541/jim20140359

Abstract

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

CLC Number:

TQ174

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.

Figures/Tables 6

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

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

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

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

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

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

References 17

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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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