Microwave dielectric properties and low temperature sintering of Ba3Ti4−x(Mg1/3Nb2/3)xNb4O21 ceramics with BaCu(B2O5) addition

• Published in: Journal of materials science. Materials in electronics 2012, Vol.23 (8), p.1449-1454
• Main Authors: Zhang, Jinjin, Zuo, Ruzhong, Lv, Yang, Zhou, Yuanyuan, Yue, Zhenxing
• Format: Article
• Language: English
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Dielectric constant; Dielectric properties; Dielectric properties of solids and liquids; Dielectric, piezoelectric, ferroelectric and antiferroelectric materials; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Electronics; Exact sciences and technology; Materials Science; Microwaves; Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals; Optical and Electronic Materials; Permittivity (dielectric function); Physics; Quality factor; Sintering; Solid solutions; Structure of solids and liquids; crystallography
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-011-0610-8

Microwave dielectric ceramics of Ba 3 Ti 4−x (Mg 1/3 Nb 2/3 ) x Nb 4 O 21 solid solutions (BTMNN-x, x = 0–4) were prepared via the conventional solid-state reaction method. The X-ray powder diffraction analysis revealed that the BTMNN-x ceramics formed complete solid solutions with hexagonal structure. The dielectric constant (ε r ) and the temperature coefficient of the resonant frequency (τ f ) of BTMNN-x ceramics decreased with the increase of x, while the quality factor (Q × f) enhanced with increasing the substitution content. In addition, a small amount of BaCu(B 2 O 5 ) (BCB) additive can effectively lower the sintering temperature of BTMNN ceramics. The 1.5 wt% BCB doped BTMNN-2 ceramics can be sintered at 950 °C and have good microwave dielectric properties of ε r  = 50, Q × f = 10,500 GHz and τ f  = 18 ppm/°C, which makes it possible to be a promising candidate for mid-permittivity low temperature co-fired ceramic materials.