Preparation and Characterization of a New Microwave Dielectric Ceramic Ba4ZnTi11O27
Abstract:Preparation, sintering behavior, and microwave dielectric properties of Ba4ZnTi11O27 ceramic were investigated. The single-phase Ba4ZnTi11O27 ceramic can be well densified in the temperature range from 1175° to 1250°C with a relative density about 97%. X-ray diffraction data show that Ba4ZnTi11O27 has a monoclinic structure (C2/m), with lattice parameters of a=19.81549 Å, b=11.43072 Å, and c=9.91129 Å when the sintering temperature is 1200°C. Pure monoclinic Ba4ZnTi11O27 ceramic sintered at 1200°C for 2 h exhibits good microwave dielectric properties with a permittivity about 36.8, Q×f value about 16 460 GHz, and temperature coefficient of resonant frequency about 17.2 ppm/°C. The addition of BaCu(B2O5) can effectively lower the sintering temperature from 1200° to 925°C and does not induce degradation of the microwave dielectric properties. Obviously, the Ba4ZnTi11O27 ceramic can be applied to microwave low-temperature cofired ceramics devices.
Document Type: Research Article
Affiliations: 1: Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guilin University of Technology, Guilin 541004, China 2: Electronic Materials Research Laboratory, Key Laboratory of the Ministry of the Education, Xi'an Jiaotong University, Xi'an 710049, China
Publication date: 2010-06-01