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- Title
Crystal structure, sintering behavior and microwave dielectric properties of Ca<sub>x</sub>Y<sub>3−x</sub>Al<sub>5−x</sub>Ti<sub>x</sub>O<sub>12</sub> (0 ≤ x ≤ 2.0) solid solution ceramics.
- Authors
Peng, Sen; Zhao, Chenglin; Huang, Guohua; Wang, Shaojie; Xu, Jianming; Li, Xingliang; Yu, Shengquan
- Abstract
A novel CaxY3−xAl5−xTixO12 (0 ≤ x ≤ 2.0) solid solution with garnet structure was synthesized by solid-state reaction technique. Ca2+ and Ti4+ substituted for Y3+ and Al3+, respectively. Ca2+/Ti4+ doping reduced the sintering temperature of CaxY3−xAl5−xTixO12 ceramics to 1450 °C, and it also improved corresponding densification process. Meanwhile, the doping strongly influenced microwave dielectric properties. For the samples sintered at 1550 °C for 3 h, the dielectric constant (εr) increased from 7.2 to 34.7 by increasing Ca2+/Ti4+ content, and at the same time the quality factor (Q × f) values increased from 12,000 to 45,200 GHz and then slightly declined to 41,000 GHz. The temperature coefficient of resonant frequency (τf) values of these samples increased monotonically from − 40 to + 31 ppm/°C by increasing Ca2+/Ti4+ content. Therefore, CaxY3−xAl5−xTixO12 solid solution ceramics with x = 1.5 sintered at 1550 °C for 3 h showed optimum microwave dielectric properties: εr = 32.6, Q × f = 45,200 GHz and τf = + 7 ppm/°C. CaxY3−xAl5−xTixO12 (0 ≤ x ≤ 2.0) solid solution ceramics with garnet structure were new promising aluminate ceramics for microwave dielectric application.
- Subjects
CERAMICS; SINTERING; MICROSTRUCTURE; HOT working; MICROWAVES
- Publication
Journal of Materials Science: Materials in Electronics, 2018, Vol 29, Issue 19, p17047
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-018-9801-x