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Microwave Dielectric Properties of La 6 Mg 4 A 2 W 2 O 24 [A=Ta and Nb] Ceramics
Author(s) -
Rajamma Rejini,
Sebastian Mailadil Thomas
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01807.x
Subject(s) - ceramic , microstructure , materials science , dielectric , microwave , analytical chemistry (journal) , scanning electron microscope , perovskite (structure) , mineralogy , crystallography , chemistry , metallurgy , optoelectronics , physics , composite material , chromatography , quantum mechanics
The microwave dielectric properties of two A‐site‐deficient perovskite‐type ceramics in the La 6 Mg 4 A 2 W 2 O 24 [A=Ta and Nb] system were investigated. The compounds were synthesized by the solid‐state ceramic route. The structure and microstructure were analyzed using X‐ray diffraction and scanning electron microscopy techniques. The dielectric properties were measured in the microwave frequency range [4–6 GHz] by the resonance method. La 6 Mg 4 Ta 2 W 2 O 24 had Q u × f =13 600 GHz, ɛ r =25.2, and τ f =−45 ppm/°C and La 6 Mg 4 Nb 2 W 2 O 24 had Q u × f =16 400 GHz, ɛ r =25.8, and τ f =−56 ppm/°C.