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Liquid Phase Effect of Bi₂O₃ and La₂O₃ on Densification, Microstructure and Microwave Dielectric Properties of MgTiO₃ Ceramics

T. Santhosh Kumar, D. Goswami, D. Pamu

Journal of Ceramic Science and Technology, Vol. 4, No. 3 (2013), pp. 145-150

DOI: 10.4416/JCST2013-00004

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Abstract

MgTiO3 (MTO) ceramics were prepared by means of the solid-state reaction method with the addition of 0.5 – 1.5 wt% Bi2O3 or La2O3 as a sintering aid. The effect of Bi2O3 or La2O3 on the densification, microstructure and microwave dielectric properties of MTO ceramics was investigated. The sintering temperature of MTO ceramics with the addition of Bi2O3 or La2O3 was lowered to 1200 and 1300 °C, respectively. The lower sintering temperatures were attributed to the liquid phase effect and smaller particle sizes. The microwave dielectric properties showed profound dependence on the sintering temperature as well as the additive concentration. The maximum Q׃0 values of 71.9 and 136.9 THz were obtained for MTO ceramics with 0.5 wt% Bi2O3 and 0.5 wt% La2O3, respectively. The microwave dielectric properties of the MTO ceramics showed significant dependence on relative density, average grain size and secondary phases.

Keywords

Keywords: Microwave ceramics, sintering, dielectric properties, scanning electron microscopy, x-ray diffraction

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