ZnBO-doped (Ba, Sr)TiO 3 ceramics for the low-temperature sintering process

Abstract

ZnBO-doped (Ba, Sr)TiO 3 ceramics were investigated for low-temperature co-fired ceramics (LTCCs) applications. Until now, B 2O 3 and Li 2CO 3 dopants have been commonly employed as the low-temperature sintering aids. In this paper, we suggest ZnBO as an alternative dopant to the B 2O 3 and Li 2CO 3. To reduce the sintering temperature of (Ba, Sr)TiO 3, we have added 1–5 wt.% of ZnBO to (Ba, Sr)TiO 3. ZnBO-doped (Ba, Sr)TiO 3 ceramics were respectively sintered from 750 to 1350 °C by 50 °C to confirm the sintering temperature with different dopant contents. By adding 5 wt.% of ZnBO to the (Ba, Sr)TiO 3 ceramics, the sintering temperature of (Ba, Sr)TiO 3 ceramics can be reduced to 1100 °C. From the XRD analysis, ZnBO-doped (Ba, Sr)TiO 3 has no pyro phase. By adding ZnBO dopants to (Ba, Sr)TiO 3 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)TiO 3 were 1180 and 3.3 × 10 −3, while those of BST were 1585 and 4.8 × 10 −3, respectively.