Low Temperature Sintering of BaO–ZnO–TiO2 Ceramics for LTCC Applications

In order to develop a new middle dielectric constant LTCC materials, the effects of BaO–ZnO–TiO2–B2O3–SiO2(BZTBS) and/or BaCu(B2O5)(BCB2) on the phase composition, microstructure and microwave dielectric properties of BaO–ZnO–TiO2 ceramics were investigated by solid-state reaction. It was found that BCB2 mainly worked as sintering aids to lower the sintering temperature and the key role of BZTBS was to affect the phase composition in favour of showing a high Q×f value. Therefore, when 5wt% BZTBS+6wt% BCB2 were co-doped, the sintering temperature was down to 850°C, and the microwave dielectric properties were improved significantly because the densification and grain size distribution were not only improved but also the phase composition was controlled. At last, this ceramics sintered at 850°C for 0.5 h showed good microwave dielectric properties: εr=28.4, Q×f=8,030 GHz and τf=2 ppm/°C. Also, it was compatible with Ag electrodes, so it was a promising candidate for LTCC application.

[1]  Mei Guo,et al.  A new temperature stable microwave dielectric ceramics: ZnTiNb2O8 sintered at low temperatures , 2011 .

[2]  T. Rabe,et al.  Low temperature sintering of barium titanate based ceramics with high dielectric constant for LTCC applications , 2011 .

[3]  Hui Yang,et al.  Microwave dielectric properties of Ba3Ti4−x(Zn1/3Nb2/3)xNb4O21 for low temperature co-fired ceramics , 2011 .

[4]  Shuren Zhang,et al.  Effect of ZnO ratio on sintering behavior and microwave dielectric properties of BaO–ZnO–TiO2 ceramics , 2010 .

[5]  Heli Jantunen,et al.  Low loss dielectric materials for LTCC applications: a review , 2008 .

[6]  Hong Wang,et al.  Microwave dielectric properties and co-firing of BiNbO4 ceramics with CuO–WO3 substitution , 2007 .

[7]  Hui Sun,et al.  A New System of Low Temperature Sintering ZnO–SiO2 Dielectric Ceramics , 2006 .

[8]  Longtu Li,et al.  Low-fired (PbCa) (FeNb) O3 ceramics for multilayer microwave filter applications , 2003 .

[9]  B. W. Hakki,et al.  A Dielectric Resonator Method of Measuring Inductive Capacities in the Millimeter Range , 1960 .

[10]  W. Lei,et al.  Phase Composition and Microwave Dielectric Properties of ZnAl2O4–Co2TiO4 Low‐Permittivity Ceramics with High Quality Factor , 2011 .

[11]  A. Belous,et al.  The homogeneity range and the microwave dielectric properties of the BaZn2Ti4O11 ceramics , 2006 .

[12]  H. Ohsato,et al.  Effects of TiO2 on sinterability and dielectric properties of high-Q forsterite ceramics , 2003 .