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Evolution of ferroelastic domain walls during phase transitions in barium titanate nanoparticles

DOI: 10.1103/PhysRevMaterials.4.106001 DOI Help

Authors: Jiecheng Diao (University College London) , Xiaowen Shi (Diamond Light Source) , Tadesse A. Assefa (Brookhaven National Laboratory) , Longlong Wu (Brookhaven National Laboratory) , Ana F. Suzana (Brookhaven National Laboratory) , Daniel S. Nunes (University College London) , Darren Batey (Diamond Light Source) , Silvia Cipiccia (Diamond Light Source) , Christoph Rau (Diamond Light Source) , Ross J. Harder (Advanced Photon Source) , Wonsuk Cha (Advanced Photon Source) , Ian K. Robinson (University College London; Brookhaven National Laboratory)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Materials , VOL 4

State: Published (Approved)
Published: October 2020

Abstract: In this work, ferroelastic domain walls inside BaTiO 3 (BTO) tetragonal nanocrystals are distinguished by Bragg peak position and studied with Bragg coherent x-ray diffraction imaging (BCDI). Convergence-related features of the BCDI method for strongly phased objects are reported. A ferroelastic domain wall inside a BTO crystal has been tracked and imaged across the tetragonal-cubic phase transition and proves to be reversible. The linear relationship of relative displacement between two twin domains with temperature is measured and shows a different slope for heating and cooling, while the tetragonality reproduces well over temperature changes in both directions. An edge dislocation is also observed and found to annihilate when heating the crystal close to the phase transition temperature.

Subject Areas: Materials, Physics

Instruments: I13-1-Coherence

Other Facilities: Advanced Photon Source

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