DIELECTRIC PROPERTIES OF ZnBo DOPED (Ba,Sr)TiO3 CERAMICS FOR THE LOW TEMPERATURE SINTERING PROCESS

Abstract

ABSTRACT ZnBO sintering aid was added to the (Ba,Sr)TiO3 ceramics for the LTCCs(Low Temperature Co-fired Ceramics) applications. Recently, low temperature sintering process has been widely investigated for the integrated electronic modules. However, the sintering temperature of (Ba,Sr)TiO3 ceramic materials are too high to apply the internal electrode materials, which have low melting point. Therefore, the high sintering temperature of (Ba,Sr)TiO3 ceramic materials needs to be reduced for LTCCs applications. In this paper, we have added 1∼5 wt% ZnBO to (Ba,Sr)TiO3. ZnBO doped (Ba,Sr)TiO3 ceramics were respectively sintered from 750 to 1350°C by 50°C to confirm the sintering temperature with different dopants. The sintering temperature of 5 wt% ZnBO doped (Ba,Sr)TiO3 ceramics was reduced down to 1100°C. From the XRD analysis, ZnBO doped (Ba,Sr)TiO3 has no pyro phase. By adding ZnBO dopants to (Ba,Sr)TiO3 ceramics, both of relative dielectric permittivity and loss tangent were decreased. From the frequency dispersion of dielectric properties, the relative dielectric permittivity and loss tangent of 5 wt% ZnBO doped (Ba,Sr)TiO3 were 1180 and 3.3×10−3, while those of BST were 1585 and 4.8 × 10−3, respectively.