Preparation and Characterization of PrAlO₃-Doped 0.95MgTiO₃-0.05CaTiO₃ Microwave Dielectric Ceramics

Abstract:

Microwave dielectric ceramics with a nominal composition of 0.95MgTiO₃-0.05CaTiO₃- xPrAlO₃ (x=0-0.015) were prepared by conventional solid-state sintering. The phase composition, microstructure and dielectric properties were characterized by X-ray diffractometer, scanning electron microscope and vector network analyzer, respectively. A two-phase system with major MgTiO₃ phase and minor CaTiO₃ phase was detected. With increasing content of PrAlO₃, the grain size of the obtained ceramics decreased; the dielectric constant and quality factor increased first and then decreased. The temperature coefficient of resonant frequency decreased after PrAlO₃ was doped, but with more PrAlO₃ doped it will increase. The obtained 0.95MgTiO₃-0.05CaTiO₃ ceramic doped by PrAlO₃ with x=0.0075 presented the best performance with ε_r=19.04, Q·f=42400 GHz and τ_f=-19.40 ppm/°C.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 579-584
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.579
• Online since: August 2018
• Authors: Lu Zhi Xie, Jun Qing Ren, Zhi Jian Peng*, Xiu Li Fu
• Keywords: 0.95MgTiO₃-0.05CaTiO₃, Doping, Microwave Dielectric Property, PrAlO₃

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