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

Journal Article · · Physical Review Materials
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3];  [1];  [2];  [2];  [2]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [5]
  1. Univ. College London (United Kingdom). London Centre for Nanotechnology
  2. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  5. Univ. College London (United Kingdom). London Centre for Nanotechnology; Brookhaven National Lab. (BNL), Upton, NY (United States)

In this work, ferroelastic domain walls inside BaTiO3 (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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); China Scholarship Council (CSC)
Grant/Contract Number:
SC0012704; EP/I022562/1; AC02-06CH11357; DMR-9724294
OSTI ID:
1661637
Alternate ID(s):
OSTI ID: 1779070
Report Number(s):
BNL-216378-2020-JAAM; TRN: US2203607
Journal Information:
Physical Review Materials, Vol. 4, Issue 10; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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