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Erschienen in:
22.06.2016
Temperature stable microwave dielectric ceramics in LiCa3−x Sr x MgV3O12 ceramics
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 10/2016
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Abstract
A series of LiCa3−x
Sr
x
MgV3O12 (x = 0.1, 0.2, 0.3) ceramics with enhanced microwave dielectric properties were prepared by the conventional solid-state reaction method. Effects of Sr2+ ions substitution for Ca2+ ions on the structure, sintering behavior, and microwave dielectric properties of LiCa3MgV3O12 were investigated. X-ray diffraction data shows that within the detectable limit of the instrument, single-phase solid solution with cubic structure could be obtained in the range of x = 0.1–0.3, while Sr4V2O9 phase appeared at x = 0.4. The microwave dielectric properties could be tuned by composition adjustment. A near-zero τ
f
value of −9.7 ppm/oC was achieved in the x = 0.3 sample along with a permittivity of 12.0, a Q × f value of 48,400 GHz (at 10.9 GHz) when sintered at 895 °C. XRD analysis and EDS analysis of the co-fired LiCa2.7Sr0.3MgV3O12 with 20 wt% Ag indicates the chemical compatibility with silver at 895 °C.