Microwave Dielectric Properties of Co2La4Ti3Si4O22 Ceramics
Co2La4Ti3Si4O22 ceramic was synthesized by the conventional solid-state ceramic route. The structure and microstructure of the sintered ceramics were characterized by X-ray diffraction (XRD) and scanning electron microscopic techniques. XRD study showed the presence of SiO2 as a secondary phase. Attempts were made to obtain phase-pure material by preparing nonstoichiometric Co2La4Ti3Si(4−x)O(22−) (where x=0.02, 0.05, 0.1, 0.25, and 0.5) ceramics. The secondary phase of SiO2 could be effectively suppressed for x=0.1 with good microwave dielectric properties. The Co2La4Ti3Si3.9O(22−) has r=17.4, Qu×f=48 700 GHz, and f=−155 ppm/°C.
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Document Type: Research Article
Affiliations: Materials and Minerals Division, National Institute for Interdisciplinary Science and Technology, CSIR, Thiruvananthapuram 695019, Kerala, India
Publication date: 01 July 2010