Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7886968 | Ceramics International | 2018 | 7 Pages |
Abstract
Li2Mg3Ti1-X(Mg1/3Nb2/3)XO6 (0â¯â¤xâ¯â¤â¯0.25) ceramics were prepared by a conventional solid-state reaction process. Their crystal structures, sintering characteristics, Raman spectra and microwave dielectric properties were then investigated. XRD patterns of the sintered samples indicated that all compositions showed a single phase and the rock-salt structure. As the (Mg1/3Nb2/3)4+ contents increase, the variations of εr values showed a downward trend, which could be explained by the changes of polarizabilities and the shift of Raman vibration modes. Q·f values initially increased to a maximum value and then decreased with increasing of x values. In addition, Ïf values decreased almost linearly with the x values, which significantly correlated with the thermal expansion coefficient. Excellent combined microwave dielectric properties with εr =â¯14.79, Q·fâ¯=â¯204,900â¯GHz and Ïf =â¯â18.43â¯ppm/°C were obtained for Li2Mg3Ti.95(Mg1/3Nb2/3).05O6 ceramic sintered at 1550â¯Â°C.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Y.K. Yang, H.L. Pan, H.T. Wu,