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- Title
Microwave dielectric properties of CaLaTiO-LaAlO system ceramic materials.
- Authors
Chen, Guo-hua; Di, Jie-chang; Xu, Hua-rui; Yang, Yun; Yuan, Chang-lai; Zhou, Chang-rong; Cheng, Jun; Liu, Xin-yu
- Abstract
Compositions in the (1 − x) CaLaTiO- xLaAlO system were prepared in order to modify the positive temperature coefficient of the resonant frequency (τ) of CaLaTiO. The microwave dielectric properties and phase composition of this system ceramics were investigated. X-ray powder diffraction results showed that CaLaTiO and LaAlO formed a solid solution only when x ≤ 0.2. The τ values showed a near linear decrease with increasing additions of LaAlO. It was observed that near zero τ value can be achieved as x = 0.64. The permittivity (ε) and the quality factor ( Q × f) values exhibited a non-linear behavior with LaAlO additions. The microwave dielectric properties were strongly correlated with composition, secondary phases and grain sizes. For practical application, a permittivity (ε) of 42, a quality factor ( Q × f value) of 12,450 GHz and a temperature coefficient of resonant frequency (τ) of ~0 ppm/°C for 0.36 CaLaTiO−0.64 LaAlO were proposed.
- Subjects
MICROWAVES; DIELECTRICS; CERAMIC materials; X-ray diffraction; PERMITTIVITY
- Publication
Journal of Materials Science: Materials in Electronics, 2012, Vol 23, Issue 1, p280
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-011-0404-z