We have investigated systematically the differences of silver cofirability and microwave dielectric properties between Zn3Nb2O8and Bi1.5Zn0.92Nb1.5O6.92(BZN). Two type dopants: 0.29BaCO3-0.71CuO (BC) and 0.81MoO3-0.19CuO (MC) were used in Zn3Nb2O8and Bi1.5Zn0.92Nb1.5O6.92ceramics so they can be cofired with silver. The BC-doped ceramics in general have better dielectric properties than those of MC-doped ceramics. The BC-doped Zn3Nb2O8exhibits better dielectric properties than those of BC-doped BZN (k = 14.7, Q × f = 8200 GHz versus k = 120.1, Q × f = 1050 GHz). For silver compatibility study, the interfacial behaviors between microwave dielectric materials and silver were investigated by using X-ray diffractometer, scanning electronic microscope, and electronic probe microanalyzer. No new crystalline phase and no silver migration behavior were found in the BC-doped Zn3Nb2O8ceramics cofired with silver, but slight silver migration was detected for BC-doped BZN. But slight silver migration was detected for MC-doped Zn3Nb2O8and BZN ceramics cofired with silver. Therefore, the good overall properties of BC-doped Zn3Nb2O8are suitable for microwave applications. © 2006 Elsevier Ltd. All rights reserved.
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