Silver cofirability differences between Bi 1.5Zn 0.92Nb 1.5O 6.92 and Zn 3Nb 2O 8

Abstract

We have investigated systematically the differences of silver cofirability and microwave dielectric properties between Zn 3Nb 2O 8 and Bi 1.5Zn 0.92Nb 1.5O 6.92 (BZN). Two type dopants: 0.29BaCO 3–0.71CuO (BC) and 0.81MoO 3–0.19CuO (MC) were used in Zn 3Nb 2O 8 and Bi 1.5Zn 0.92Nb 1.5O 6.92 ceramics 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 Zn 3Nb 2O 8 exhibits 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 Zn 3Nb 2O 8 ceramics cofired with silver, but slight silver migration was detected for BC-doped BZN. But slight silver migration was detected for MC-doped Zn 3Nb 2O 8 and BZN ceramics cofired with silver. Therefore, the good overall properties of BC-doped Zn 3Nb 2O 8 are suitable for microwave applications.