Affiliation:
1. School of Physics Nanjing University Nanjing 210093 China
2. Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China
3. National Laboratory of Solid State Microstructures Department of Materials Science and Engineering College of Engineering and Applied Sciences and Jiangsu Key Laboratory of Artificial Functional Materials and Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China
4. National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional Materials College of Engineering and Applied Science and Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China
Abstract
AbstractTo meet the needs of energy storage under high temperature and high pressure, a high‐entropy relaxor ferroelectric ceramic, La‐modified (Bi0.2Na0.2Ba0.2Sr0.2Ca0.2)TiO3 is prepared, which has excellent thermal and mechanical stability. At the wide temperature range of 327–689 K (tan δ < 0.01) and below ≈7 GPa, the material shows extraordinary functional performance. Comprehensive study indicates that the ceramic possesses a single‐phase cubic perovskite structure, and as the pressure increases, the material undergoes a transition at ≈8 GPa, in which enormous large grains crack into smaller grains, but the space group does not change. In addition, with further compression, the grains begin to rotate and re‐orientate at ≈9 GPa. Based on the investigations, it is considered that the suitable doping of multiple cations can effectively improve the stability of ceramics, and it also paves the experimental way to further study thermally and mechanically stable high‐entropy ceramics.
Funder
National Natural Science Foundation of China
NSAF Joint Fund
Cited by
1 articles.
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