Influence of the synthesis method on microstructural features of Ba2MgWO6 ceramics sintered by SPS

Abstract

The influence of the synthesis method on the microstructural properties of Ba2MgWO6 ceramic materials has been examined. Powder samples were obtained by three synthesis methods: high-temperature solid-state reaction (s-s), mechanochemical (m-c), and co-precipitation (c-p). The SPS technique of ceramic sintering at 1350 °C and under 50 MPa of uniaxial pressure was applied. The SPS process does not change the structure of the obtained materials and each of them has a cubic double perovskite structure. The s-s reaction method turned out the most suitable method to obtain fully dense and homogeneous ceramics. SPS sintering allows a high level of compaction with limited grain growth, and reduces the BaWO4 content, which means that some additional chemical reaction between the residual precursors and/or intermediate phases may occur during compaction. Probably, this is due to an increase in temperature and/or thickening which respectively increases the diffusion kinetics/reduces the length of the diffusion path.