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Erschienen in: Journal of Materials Science: Materials in Electronics 15/2019

10.07.2019

Structures and microwave dielectric behavior of Sr0.1Ca0.9TiO3–Bi0.1Na0.1Li0.4Sm0.4TiO3 ceramic system

verfasst von: Qin Feng, Chang-Lai Yuan, Xiao Liu, Qingning Li, Nengneng Luo

Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 15/2019

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Abstract

Microwave dielectric ceramics with xSr0.1Ca0.9TiO3–(1−x)Bi0.1Na0.1Li0.4Sm0.4TiO3 (xSCT–BNLST) compositions were prepared through the conventional oxide-state reaction. X-ray diffraction results showed that the symmetry in xSCT–BNLST system were improved with the increase of x. Based on the calculation results, the deviation of observed dielectric polarizabilities from theoretical values could be ascribed to the increase of A-site ionic polarizability and B-site bond valence. The decreased temperature coefficient of resonant frequency, τf, was dependent on the B-site bond valence in the tilted region. With the increase of temperature, the samples changed their main conductive carrier, from first ionization of oxygen vacancies to second ionization of oxygen vacancies. Optimum microwave dielectric properties were achieved, for 0.09SCT–BNLST ceramic with relative permittivity, εr = 111, quality factor, Q × f = 3819 GHz and τf ~ 0 ppm/°C. The system has the potential for use in dielectrically loaded antennas and C0G high-frequency filter applications.

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Metadaten
Titel
Structures and microwave dielectric behavior of Sr0.1Ca0.9TiO3–Bi0.1Na0.1Li0.4Sm0.4TiO3 ceramic system
verfasst von
Qin Feng
Chang-Lai Yuan
Xiao Liu
Qingning Li
Nengneng Luo
Publikationsdatum
10.07.2019
Verlag
Springer US
Erschienen in
Journal of Materials Science: Materials in Electronics / Ausgabe 15/2019
Print ISSN: 0957-4522
Elektronische ISSN: 1573-482X
DOI
https://doi.org/10.1007/s10854-019-01827-7

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