Microwave dielectric properties and microstructure of 0.85MgTiO 3-0.15Ca0.6la0.8/3TiO3 dielectric ceramics with added sintering aids

Yuan Bin Chen, Cheng Liang Huang, Chen Weng Lon, Chih Hung Wei, Yu Ping Hsieh, Yi Hong Huang

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The effects of additive sintering aids on the microstructures and microwave dielectric properties of 0.85MgTiO3-0.15Ca0.6La 0.8/3TiO3 ceramics were investigated. CuO was selected as a liquid phase sintering aid to lower the sintering temperature of 0.85MgTiO3-0.15Ca0.6La0.8/3TiO3 ceramics. With added CuO, the densification temperature of 0.85MgTiO 3-0.15Ca0.6La0.8/3TiO3 can be effectively reduced from 1450 to 1160-1300°C. Low-level doping of CuO (0.5-5 wt %) significantly improves the density and dielectric properties of 0.85MgTiO3-0.15Ca0.6La0.8/3TiO3 ceramics. The quality factor Q × f was strongly dependent upon the amount of additives, Q × f values of 60000 and 20000 GHz could be obtained at 1160-1300°C with 0.5 and 5 wt % CuO added, respectively. Over all ranges of addition, the relative dielectric constants differed significantly and ranged from 23.2 to 26.1. The temperature coefficient varied from 0 to -3.7 ppm/°C.

Original languageEnglish
Pages (from-to)5086-5091
Number of pages6
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number7 A
Publication statusPublished - 2005 Jul 8

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)


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