Disminución drástica de la temperatura de sinterización del Ba (Zn_1/3Ta_2/3) O₃ mediante la adición de una fase vítrea y sales de litio

International audienceThe complex perovskite oxide Ba(Zn1/3Ta2/3)O3 (BZT) has been studied for its attractive dielectric properties which make this material interesting for applications such as multilayer ceramics capacitors or hyperfrequency resonators. Nevertheless, BZT ceramic requires high temperature to be correctly sintered (@1450°C), that is too high to envisage a silver co-sintering (Tf(Ag) = 961°C). For this reason, the lowering of the sintering temperature of BZT by glass phase’s additions has been investigated. This material is sinterable at low temperature with combined glass phase –lithium salt additions, and exhibits, at 1MHz very low dielectric losses combined with relatively high dielectric constant and a good stability of this later versus temperature. The 5 wt% of ZnO-SiO2-B2O3 glass phase and 1 wt% of LiF added BZT sample sintered at 900°C exhibits a relative density higher than 95% and attractive dielectric properties: a dielectric constant εr of 32, low dielectrics losses (tan (δ) 95%) y las propiedades dieléctricas de interés: la constante dieléctrica de 32, bajas pérdidas dieléctricas (tan (δ)