Properties of barium zirconate sintered from different barium and zirconium sources

In this study, barium zirconate powder was prepared by a solid-state reaction using different barium and zir-conium sources. Thermal analysis and phase identification demonstrated that barium zirconate could be syn-thesized from barium hydroxide at a lower temperature than from barium carbonate. Copper oxide was used as a dopant to improve the sintering performance of the barium zirconate; sintered samples with 2 mol% copper oxide exhibited relatively superior comprehensive performance. The mechanical properties and thermal stability of barium zirconate were characterized; the internal composition structure of the samples prepared with basic zirconium carbonate was uneven, resulting in somewhat reduced performance. The samples maintained a high elastic modulus and strength before and after thermal shock. It was observed under an electron microscope that a liquid phase was generated inside the samples after thermal shock, and numerous barium zirconate whiskers were formed. The whiskers ensured that the sample could withstand greater thermal stress, thus exhibiting excellent thermal shock stability. This work demonstrates the promising potential of barium zirconate in the field of high-temperature materials.

Automated summary

The study showed that barium zirconate can be synthesized at a lower temperature using barium hydroxide compared to barium carbonate, and the addition of copper oxide improves sintering performance. However, samples prepared with basic zirconium carbonate had uneven internal composition structures, affecting their performance.