Using a conventional solid-state reaction Ca 5 A 4 (VO 4 ) 6 (A 2+ = Mg, Zn) ceramics were prepared and their microwave dielectric properties were investigated for the first time. X-ray diffraction revealed the formation of pure-phase ceramics with a cubic garnet structure for both samples. Two promising ceramics Ca 5 Zn 4 (VO 4 ) 6 and Ca 5 Mg 4 (VO 4 ) 6 sintered at 725°C and 800°C were found to possess good microwave dielectric properties: e r = 11.7 and 9.2, Q 3 f = 49 400 GHz (at 9.7 GHz) and 53 300 GHz (at 10.6 GHz), and τ f = À83 and À50 ppm/°C, respectively.
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