Ba₃La₂Ti₂Ta₂O₁₅:A New Microwave Dielectricof A₅B₄O₁₅-type Cation-deficient Perovskites

À´Ô´ÆÚ¿¯£ºJournal Of Wuhan University Of Technology Materials Science Edition2008ÄêµÚ3ÆÚ

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Õª    Òª£ºThe synthesis,structure and properties of a new A 5B 4O 15-type cation-deficient perovskite Ba 3 La 2 Ti 2 Ta 2 O 15 were discribed.The compound 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 results reveal that the compound is successfully synthesized.The compound crystallizes in the trigonal system with unit cell parameter a=5.6730£¨2£©ý¼,c=11.6511£¨2£©ý¼,V=324.93£¨1£©ý¼3 and Z=1. The microwave dielectric properties of the ceramic are studied using a network analyzer,and it shows a high dielectric constant of 45.1,a high quality factors with Q¡Áf of 21 029 GHz,and a positive¦Ó f of 5.3 ppm¡æ-1.