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Journal of Materials Science: Materials in Electronics
Erschienen in: Journal of Materials Science: Materials in Electronics 3/2016

14.11.2015

New microwave dielectric system of Li4x Mg3(1−x)Al6(1−x)Ti5x O12 with adjustable thermal stability and high quality factor

verfasst von: Huanfu Zhou, Jianzhang Gong, Nan Wang, Xiuli Chen

Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 3/2016

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Abstract

Li4x Mg3(1−x)Al6(1−x)Ti5x O12 (x = 0.2, 0.4, 0.6, 0.8) ceramics were prepared by a solid state reaction method. The phase evolution, microstructure and composition of ceramics were investigated using X-ray powder diffractometer, scanning electron microscope, energy dispersive spectrometer. The microwave dielectric properties of ceramics were studied by a network analyzer. Both MgAl2O4 and Li4Ti5O12 have a cubic spinel structure, whereas no uniform solid solution was formed in Li4x Mg3(1−x)Al6(1−x)Ti5x O12 ceramics. There were Al-rich compounds and Ti-rich compounds in the mixed phases. With increasing x form 0.2 to 0.8, Al-rich compounds decreased and Ti-rich compounds increased. A complex phase evolution was appeared in the process, such as Mg2TiO4, Li2MgTi3O8 and Li4Ti5O12 compounds. With increasing x values, the sintering temperature was reduced from 1280 to 925 °C. Li4x Mg3(1−x)Al6(1−x)Ti5x O12 ceramics presented an excellent comprehensive performance with ε r of 11.5–26.5, Q × f values of 7102–30,191 GHz and τ f values of −55.4 ~ +5.7 ppm/ °C.
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Metadaten
Titel
New microwave dielectric system of Li4x Mg3(1−x)Al6(1−x)Ti5x O12 with adjustable thermal stability and high quality factor
verfasst von
Huanfu Zhou
Jianzhang Gong
Nan Wang
Xiuli Chen
Publikationsdatum
14.11.2015
Verlag
Springer US
Erschienen in
Journal of Materials Science: Materials in Electronics / Ausgabe 3/2016
Print ISSN: 0957-4522
Elektronische ISSN: 1573-482X
DOI
https://doi.org/10.1007/s10854-015-4058-0

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