Structure, mechanical properties, and thermal conductivity of BaZrO3 doped at the A-B site

BaZrO3 with the ABO(3) perovskite structure can be doped at the A or B sites to obtain the corresponding properties. In this study, BaZrO3 was doped with Ca2+, Sr2+, Ti4+, and Ce4+. The structure, phase composition, and mechanical and thermal properties of the composites were investigated. The sintered Ba1-xCaxZrO3 samples with x = 0.2 and 0.4 exhibited relatively superior comprehensive behaviours; the cold modulus of rupture was increased by 127.36% and 134.59%, while that for BaZr0.8Ti0.2O3 and BaZr0.8Ce0.2O3 was increased by 99.30% and 112.37%, respectively. Further increases in strength and density were obtained in the Ba0.8Ca0.2Zr0.8Ti0.2O3 and Ba0.6Ca0.4Zr0.8Ti0.2O3 co-doped samples, and the corresponding apparent porosities were greatly decreased from 30.6% to below 1.0%. The thermal conductivities of the doped samples were generally low, achieving a minimum of 0.361 W/(m.K). The combination of high strength and low thermal conductivity demonstrate the significant application potential of BaZrO3-based composite materials.

Automated summary

BaZrO3 with dopants of Ca2+, Sr2+, Ti4+, and Ce4+ were studied for their structure, phase composition, mechanical, and thermal properties. The results showed that the doped BaZrO3 samples exhibited superior comprehensive behaviors with high strength and low thermal conductivity.