Journal of Inorganic Materials ›› 2015, Vol. 30 ›› Issue (4): 369-373.doi: 10.15541/jim20140359

• Orginal Article • Previous Articles     Next Articles

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

Hai-Tao LI(), Qian LI, Yan-Fu YAN, Rong-Hui XU   

  1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China
  • Received:2014-07-08 Revised:2014-09-15 Online:2015-04-29 Published:2015-03-26
  • Supported by:
    National Natural Science Foundation of China (51175151);Start-up Fund Dr of Henan University of Science and Technology (09001542)

Abstract:

The Ca0.25(Li0.43Sm0.57)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 εr and the quality factor Qf possess a peak value with increasing ZnO doping content or sintering temperature, whereas the frequency temperature coefficient τf decrease monotonously. The x=1.0 sample sintered at 1100℃ for 2 h has optimal microwave dielectric properties: ρ = 4.85 g/cm3, εr = 102.8, Qf = 5424 GHz, τf =-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