Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5460984 | Journal of Alloys and Compounds | 2017 | 8 Pages |
Abstract
The microwave dielectric characteristics of Ca[(AlxGa0.5-xNb0.5)0.5Ti0.5]O3 (x = 0, 0.1, 0.2, 0.4, 0.5) ceramics were investigated together with the structure evolution. Distorted perovskite structure in space group Pbnm with b-b-c+ tilting was determined for the present solid solutions, where the microstructures were remarkably affected by Al-content. Owing to the Al-substitution which was accompanied by the subdued octahedral tilting, the Qf value reached up to 40,000 GHz with increasing x, the dielectric constant (εr) remained at around 50, and the temperature coefficient of resonant frequency (Ïf) could be adjusted to near zero. Low-loss temperature-stable microwave dielectric ceramics with medium dielectric constant were obtained at x = 0.2-0.5, which exhibited Qf values of 35,900-40,000 GHz, εr of 49.2-53.4, and Ïf of 0.6-3.5 ppm/°C.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Song Lin Zhang, Pian Pian Ma, Xiao Qiang Liu, Xiang Ming Chen,