Microwave sintering of Ca_0.6La_0.2667TiO₃ microwave dielectric ceramics

Jia-mao Li1,2) and Tai Qiu1)1) College of Materials Science and Engineering,Nanjing University of Technology,Nanjing 210009,China2) School of Materials Science and Engineering,Anhui University of Technology,Ma’anshan 243002,China

摘 要：Ca0.6La0.2667TiO3 ceramics were prepared by conventional and microwave sintering techniques and their sinterability,microstruc-ture,and microwave dielectric properties were investigated in detail for comparison.Densified Ca0.6La0.2667TiO3 ceramics were obtained by microwave sintering at 1350oC for 30 min and by conventional sintering at 1450oC for 4 h.An unusual phenomenon was found that some larger grains（grain size range:8-10 μm） inclined to assemble in one area but some smaller ones（grain size range:2-4 μm） inclined to gather in another area in the microwave sintered ceramics.The microwave dielectric properties of Ca0.6La0.2667TiO3 ceramics prepared by micro-wave sintering at 1350oC were as follows:dielectric constant（εr） = 119.6,quality factor（Qf） = 17858.5 GHz,and temperature coefficient of resonant frequency（τf） = 155.5 ppm/oC.In contrast,the microwave dielectric properties of the ceramics prepared by conventional sintering at 1450oC were εr = 117.4,Qf = 13375 GHz,and τf = 217.2 ppm/oC.

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