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	Dielectric loss spectrum of ceramic MgTiO3 investigated by AC impedance and microwave resonator measurements
	Kuang, Xiaojun ; Jing, Xiping ; Tang, Zongxi
	2006
英文摘要	MgTiO3 ceramic was selected as a model material of the microwave dielectric ceramics for the investigation of the dielectric loss spectrum. Conductivity spectra in the low-frequency range 1-106 Hz at elevated temperatures and the dielectric loss spectrum in the microwave range 6-14 GHz at room temperature were characterized by AC impedance spectroscopy and the microwave resonator method, respectively. The experimental data were analyzed by using Jonscher's universal power law, the Arrhenius equation as well as the classic dispersion theory. Consequently, a dielectric loss spectrum (tg ???f plot) at room temperature in a wide frequency range was obtained. Based on the loss spectrum, the dielectric loss can be classified into three mechanisms in MgTiO3 ceramic (each dominates the loss in different frequency ranges): DC conductance (in DC field), AC conductance (7 Hz), and anharmonicity of lattice vibration (in GHz range). The influence of defects on the microwave dielectric loss possibly is because of atom defects via damage of the perfection of lattice and modification of the anharmonic force in lattice, while the electronic defects trapped on the atomic defects affect the DC and AC losses. ? 2005 The American Ceramic Society.; EI; 1; 241-246; 89
语种	英语
DOI标识	10.1111/j.1551-2916.2005.00669.x
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/461693]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Kuang, Xiaojun,Jing, Xiping,Tang, Zongxi. Dielectric loss spectrum of ceramic MgTiO3 investigated by AC impedance and microwave resonator measurements. 2006-01-01.

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