A strain-driven thermotropic phase boundary in BaTiO3 at room temperature by cycling compression
Source abstract
Abstract
In BaTiO3 single crystals, we observed a strain-driven phase transition from the tetragonal phase to the tetragonal-orthorhombic phase boundary which can be introduced by slow cycling compressions (a loading of up to 0.5 GPa, strain rate of 10−4 s−1, and 100 cycles) at room temperature. Different from the well-known tetragonal to cubic phase transition under stress (∼2 GPa), it only takes place locally around bent 90° domain walls. The inhomogeneous local stress and electrical fields as well as the mobile point defect pinning effect contribute to the phase re-entrance. Through comparison experiments by in situ synchrotron x-ray diffraction, Raman scattering, and (scanning) transmission electron microscopy, we explored the phase transition mechanism. Based on that, we developed a mechanical method to obtain well-stabilized high-density thermotropic phase boundary structures (with tetragonal, orthorhombic, and bridging monoclinic phases) in BaTiO3 for potential applications.
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Research context
OpenAlex topics: Ferroelectric and Piezoelectric Materials · Electronic and Structural Properties of Oxides · Acoustic Wave Resonator Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Physics, Nanjing University 1 , Nanjing 210093, China
Solid State Microstructure National Key Lab and Collaborative Innovation Center of Advanced Microstructures, Nanjing University 2 , Nanjing 210093, China
Department of Materials Science and Engineering, College of Engineering and Applied Sciences, Nanjing University 3 , Nanjing 210093, China
National Center of Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory 4 , Berkeley, California 94720, USA
Department of Materials Science and Engineering, University of California 5 , Berkeley, California 94720, USA
Center for High Pressure Science and Technology Advanced Research 6 , Shanghai 201203, China
Funding
Natural Science Foundation of Jiangsu Province · National Natural Science Foundation of China · Shanghai Synchrotron Radiation Facility
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