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

Keywords: Ceramics, microwave dielectric properties, NaCa₄V₅O₁₇, tetrahedral distortion