Ba3La3Ti4NbO18: a new microwave dielectric of A6B5O18-type cation-deficient perovskites

A new A6B5O18-type cation-deficient perovskite Ba3La3Ti4NbO18 was prepared by conventional solid-state reaction. The phase composition and structure of the ceramics were characterised by XRD and SEM. The compound crystallises in the trigonal system with unit cell parameters a = 5.6198(1) Angstrom, c...

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Bibliographic Details
Published in:Materials letters 2005-02, Vol.59 (4), p.535-538
Main Authors: Fang, L, Zhang, H, Yuan, R Z, Liu, H X
Format: Article
Language:English
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Summary:A new A6B5O18-type cation-deficient perovskite Ba3La3Ti4NbO18 was prepared by conventional solid-state reaction. The phase composition and structure of the ceramics were characterised by XRD and SEM. The compound crystallises in the trigonal system with unit cell parameters a = 5.6198(1) Angstrom, c = 41.6402(4) Angstrom, V = 1138.90(1) Angstrom3, and Z = 3. The microwave dielectric properties of the ceramic were studied using a network analyser, showing a high dielectric constant of 47.44, a high quality factor with Qxf of 17729 GHz, and a positive tauf of +35.2 ppm/C. 24 refs.
ISSN:0167-577X
DOI:10.1016/j.matlet.2004.10.044