Sintering behavior and microwave dielectric properties of CaTi1-x(Nb1/2Al1/2)xO3

Akbar Khan, Asif Ali, I. Khan
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引用次数: 3

Abstract

CaTi1-x(Nb1/2Al1/2)xO3 with x=0.1-0.5 ceramics were processed  through solid state sintering. X-rays diffraction (XRD) patterns of the compositions showed that the samples have orthorhombic crystal structure with symmetry (Pbnm). The symmetry was further confirmed using Raman spectroscopy. A total of 13 Raman modes were detected, which were in agreement with the XRD results. Microstructure analysis of the samples showed porosity in the samples, presumably due to the substitution of Al, having high melting point. As the concentration of Al and Nb increased, relative permittivity (er), quality factor (Q×fo) and temperature coefficient of resonance frequency decreased. Optimum microwave dielectric properties were achieved for the composition x=0.5 sintered at 1650 °C for 8 h i.e., er ~27.09, Q×fo ~17378 GHz and tf ~ -2.5 ppm/°C.
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CaTi1-x(Nb1/2Al1/2)xO3的烧结行为和微波介电性能
采用固态烧结法制备了x=0.1 ~ 0.5的CaTi1-x(Nb1/2Al1/2)xO3陶瓷。x射线衍射(XRD)结果表明,样品具有对称的正交晶体结构(Pbnm)。利用拉曼光谱进一步证实了这种对称性。共检测到13种拉曼模式,与XRD结果一致。样品的微观结构分析表明,样品中有孔隙,可能是由于Al的取代,具有较高的熔点。随着Al和Nb浓度的增加,相对介电常数(er)、质量因子(Q×fo)和谐振频率温度系数减小。在1650℃下烧结8 h,获得了最佳的微波介电性能,即er ~27.09, Q×fo ~17378 GHz和tf ~ -2.5 ppm/℃。
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