Effects of V2O5 on sinterability and microwave dielectric properties of NaCa4V5O17 ceramics
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초록
The NaCa4V5O17 ceramics owing low sintering temperature had been prepared via conventional solid state reaction methodusing V2O5 as vanadium source. The sinterability, microwave dielectric characterisations and compatibility with Ag wereinvestigated. Pure phase NaCa4V5O17 with triclinic structure was confirmed by Rietveld refinement and Raman spectrum. Thepermittivity (εr) and quality factor (Qxf) values mainly depended on the relative density, whereas the temperature coefficientof resonant frequency (τf) value was closely connected with the tetrahedral distortion of V(1)O4. The NaCa4V5O17 ceramicssintered at 800 oС owned high densification and moderate microwave dielectric performances under 10.7 GHz: εr = 9.5, Q×f= 34,200 GHz, τf = -90.0 ppm/oС, but poor chemical compatibility with Ag paste.
Abstract
The NaCa4V5O17 ceramics owing low sintering temperature had been prepared via conventional solid state reaction methodusing V2O5 as vanadium source. The sinterability, microwave dielectric characterisations and compatibility with Ag wereinvestigated. Pure phase NaCa4V5O17 with triclinic structure was confirmed by Rietveld refinement and Raman spectrum. Thepermittivity (εr) and quality factor (Qxf) values mainly depended on the relative density, whereas the temperature coefficientof resonant frequency (τf) value was closely connected with the tetrahedral distortion of V(1)O4. The NaCa4V5O17 ceramicssintered at 800 oС owned high densification and moderate microwave dielectric performances under 10.7 GHz: εr = 9.5, Q×f= 34,200 GHz, τf = -90.0 ppm/oС, but poor chemical compatibility with Ag paste.
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