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High Q Microwave Dielectric Ceramics in the Li 2 ( Zn 1− x A x ) Ti 3 O 8 ( A = Mg , Co ; x = 0.02–0.1) System
Author(s) -
Huang ChengLiang,
Su ChiaHui,
Chang ChungMin
Publication year - 2011
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.1551-2916.2011.04894.x
Subject(s) - sintering , ceramic , materials science , analytical chemistry (journal) , mineralogy , dielectric , nuclear chemistry , crystallography , chemistry , metallurgy , chromatography , optoelectronics
Using a conventional solid‐state reaction, followed by sintering at 1080°C–1200°C Li 2 ( Zn 1− x A x ) Ti 3 O 8 ( A = Mg, Co and x = 0.02–0.1) ceramic system with >96% density were prepared. The XRD patterns of the sintered samples revealed single‐phase formation with a cubic crystal symmetry. The molecular volume shows good linear relationship with x value. The microwave dielectric properties of Li 2 ( Zn 1− x A x ) Ti 3 O 8 ceramics exhibited a significant dependence on the x value and to some extent on the morphology of the specimens. The Li 2 (Zn 0.94 Mg 0.06 )Ti 3 O 8 ceramics possess ε r = 26.1, Q × f = 150 000 GHz, and τ f = −13.9 ppm/°C, and Li 2 (Zn 0.92 Co 0.08 )Ti 3 O 8 ceramics show ε r = 24.7, Q × f = 140 000 GHz, and τ f = −13.4 ppm/°C, respectively. It indicates a substantial increase in the Q × f in comparison with that of pure Li 2 ZnTi 3 O 8 . The microwave dielectric properties of these partially substituted ceramics are reported for the first time.