Microwave dielectric properties of Ga3+ and Ta5+ co-doped CaTiO3
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- 作者：Raz Muhammad ; Yaseen Iqbal
- 刊名：Journal of Materials Science
- 出版年：2016
- 出版时间：March 2016
- 年：2016
- 卷：51
- 期：6
- 页码：2958-2963
- 全文大小：688 KB
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Yaseen Iqbal (2)
1. Department of Physics, Islamia College University Peshawar, Peshawar, 25120, Khyber Pakhtunkhwa, Pakistan
2. Materials Research Laboratory, Department of Physics, University of Peshawar, Peshawar, 25120, Pakistan - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Materials Science
Characterization and Evaluation Materials
Polymer Sciences
Continuum Mechanics and Mechanics of Materials
Crystallography
Mechanics - 出版者：Springer Netherlands
- ISSN：1573-4803
文摘
Compositions in the (1 − talic ">x)CaTiO3–talic ">xCa(Ta1/2Ga1/2)O3 (x = 0.4, 0.45, 0.50, 0.55) series were processed through a solid-state mixed-oxide route. X-ray diffraction (XRD) of x = 0.5 and 0.55 compositions revealed the formation of single-phase ceramics with orthorhombic (Pbnm) symmetry. At x ≤ 0.45, a couple of low intensity XRD peaks matching PDF# 04-002-5066 for Ca3TiTaGa3O12 were also observed which indicated second-phase formation. The microstructure of the sintered pellets for x = 0.5 and 0.55 compositions comprised densely packed irregular-shaped large grains with uniform contrast. The unit cell volume increased with increasing Ta5+ and Ga3+ contents at the B-site, which caused a decrease in both the relative permittivity (ε r) and temperature coefficient of resonance frequency (τ f) but an increase in quality factor (Q × f o). The optimum microwave dielectric properties (i.e., ε r ~ 47, Q × f o ~ 26,630 GHz and τ f ~ −2.64 ppm/ °C) were achieved for the x = 0.5 composition (i.e., CaTi0.5Ta0.25Ga0.25O3) which can be a potential candidate material for microwave dielectric applications. Thus, the substitution of Ta and Ga at the B-site of CaTiO3 was useful in tuning the larger positive τ f through zero and increasing Q × f o without too much compromise on ε r.