Ba3LaTa3O12: A new microwave dielectric of A4B3O12-type cation-deficient perovskites

A new Ta-based A4B3O12-type cation-deficient perovskite Ba3LaTa3O12 was prepared by the conventional solid-state reaction route. The phase and structure of the ceramics were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM). The compound crystallizes in the trigonal system...

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Bibliographic Details
Published in:Materials letters 2008-02, Vol.62 (4-5), p.594-596
Main Authors: Fang, Liang, Wu, Yanmei, Hu, Chang-zheng, Chen, Pu, Zhang, Hui
Format: Article
Language:English
Subjects:
Dielectrics
Electroceramics
Perovskites
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Summary:A new Ta-based A4B3O12-type cation-deficient perovskite Ba3LaTa3O12 was prepared by the conventional solid-state reaction route. The phase and structure of the ceramics were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM). The compound crystallizes in the trigonal system with unit cell parameter a=5.747(1) Å, c=28.195(2) Å, V=805.8(3) Å3 and Z=3. The microwave dielectric properties of the ceramic were studied using a network analyzer, and it shows a high dielectric constant of 39.4, a high quality factors with Qu×f of 26,815 GHz at 6.03 GHz, and a negative τf of −45.9 ppm°C−1.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2007.06.008