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The effects of Y 2 O 3 substitution on the microstructure and microwave dielectric properties of Ba(Co 0.6-x Y x Zn 0.38 ) 1/3 Nb 2/3 O 3 (x = 0-0.06) ceramics prepared by the conventional solid-state route technique were investigated. The X-ray diffraction results presented that all the well sintered samples exhibited the main phase BaZn 0.33 Nb 0.67 O 3 -Ba 3 CoNb 2 O 9 and a certain amount of Ba 8 CoNb 6 O 24 second phase. The 1:2 B-site cation ordering degree was found to influenced by the replacement of Y 3? , especially for x = 0.02. Then the scanning electron microscopy pictures of the optimally well-sintered (1375°C for 20 h) ceramics has shown a dense microstructure. Although the e r almost kept unchanged, appropriate doping content would greatly improve the Q 9 f value. Meanwhile, the s f value increased slightly with increasing x. At last, the excellent microwave dielectric properties of e r = 35.21, Q 9 f = 72,046 GHz, s f = 3.65 ppm/°C were obtained for x = 0.02 sintered in air at 1375°C for 20 h.

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