Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7898728 | Journal of the European Ceramic Society | 2018 | 32 Pages |
Abstract
Li2Ti1-x(Mg1/3Nb2/3)xO3 ceramics were prepared by conventional solid state process. Their structural evolution, grain growth kinetics and microwave dielectric properties have been studied in this paper. The results show that continuous solid solution could be formed within the experiment compositional range. The structure changed from long range ordered monoclinic into short range ordered cubic phase as the increase in x. Small levels of substitution for Ti4+by (Mg1/3Nb2/3)4+ slightly decreased the dielectric permittivity, while considerably improved the Q Ã f value. The temperature coefficient of resonant frequency changed from positive into negative value. The grain growth kinetics during sintering process and Q Ã f value of the sintered body were affected by different calcining temperature of mixed powders. Excellent combined microwave dielectric properties with εr â¼21.0, Q Ã f â¼Â 200 000 GHz and Ïf value of â1 ppm/ °C could be obtained after optimizing calcining temperature for the x = 0.24 composition after sintering at 1250 °C/2 h.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
J.J. Bian, X.H. Zhang,