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摘要
Low-temperature co-fired ceramics (LTCCs), with a Zn(Mn1-xTix)(3)O-7 (0 <= x <= 1.0) composition, were prepared using a conventional solid-state method. A novel ZnMn3O7 ceramic was obtained, with a ZnMn2O4 spinel structure, epsilon(r) of 7.32, Q x f of 13,667 GHz, and tau(f) of -58.33 ppm/degrees C. The effect of various dopant concentrations on the microstructure and microwave dielectric properties of the material was investigated. Results showed that the increase in dopant concentration changed the phase composition, improved the microwave dielectric properties, and reduced the sintering temperature of the Zn(Mn1-xTix)(3)O-7 by a factor of 250 degrees C. The dielectric constant of Zn(Mn1-xTix)(3)O-7 varied from 7.32 to 33.08 at x=0.8. However, the maximum value was reduced to 27.67 at x=1.0. Moreover, the value of Q x f increased significantly up to a maximum value of 18,934 GHz, whereas tau(f) changed gradually from -58.33 ppm/degrees C to +289.25 ppm/degrees C. In addition, promising LTCC materials with stable temperature characteristics and co-firing compatibility with silver electrodes can be obtained in the nominal Zn(Mn1-xTix)(3)O-7 (x=0.68) ceramics with 5 wt% ZnO-B2O3 glass sintered at 900 degrees C. This material possesses the following microwave dielectric properties: epsilon(r) of 18.2, Q x f of 12,018 GHz, and tau(f) of -3.98 ppm/degrees C.
- 出版日期2015-8
- 单位华中科技大学
