Formation of dislocations via misfit strain across interfaces in epitaxial BaTiO 3 and SrIrO 3 heterostructures
Abstract
Dislocations often occur in thin films with large misfit strain as a result of strain energy accumulation and can drastically change the film properties. Here the structure and dislocations in oxide heterostructures with large misfit strain are investigated on atomic scale. When grown on SrTiO3 (001), the dislocations in both the monolithic BaTiO3 thin film and its superlattices with SrIrO3 appear above a critical thickness around 6 nm. The edge component of the dislocations is seen in both cases with the Burgers vector of a $$\langle$$100$$\rangle$$. However, compared to monolithic BaTiO3, the dislocation density is slightly lower in BaTiO3/SrIrO3 superlattices. In the superlattice, when considering the SrTiO3 lattice constant as the reference, BaTiO3 has a larger misfit strain comparing with SrIrO3. It is found that in both cases, the formation of dislocation is only affected by the critical thickness of the film with larger lattice misfit (BaTiO3), regardless of the existence of a strong octahedral tilt/rotation mismatch at BaTiO3/SrIrO3 interface. Our findings suggest that it is possible to control the position of dislocations, an important step toward defect engineering.
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Louisiana State Univ., Baton Rouge, LA (United States)
- Sponsoring Org.:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1835427
- Alternate Identifier(s):
- OSTI ID: 1787825; OSTI ID: 1867207
- Report Number(s):
- BNL-221629-2021-JAAM
Journal ID: ISSN 0953-8984
- Grant/Contract Number:
- AC02-98CH10886; SC0012704; SC0002136
- Resource Type:
- Published Article
- Journal Name:
- Journal of Physics. Condensed Matter
- Additional Journal Information:
- Journal Name: Journal of Physics. Condensed Matter Journal Volume: 33 Journal Issue: 27; Journal ID: ISSN 0953-8984
- Publisher:
- IOP Publishing
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; TEM; dislocation; multiferroics; ferroelectrics; thin films; defects
Citation Formats
Saghayezhian, M., Wang, Z., Howe, D., Siwakoti, P., Plummer, E. W., Zhu, Y., and Zhang, Jiandi. Formation of dislocations via misfit strain across interfaces in epitaxial BaTiO 3 and SrIrO 3 heterostructures. United Kingdom: N. p., 2021.
Web. doi:10.1088/1361-648X/abfdf1.
Saghayezhian, M., Wang, Z., Howe, D., Siwakoti, P., Plummer, E. W., Zhu, Y., & Zhang, Jiandi. Formation of dislocations via misfit strain across interfaces in epitaxial BaTiO 3 and SrIrO 3 heterostructures. United Kingdom. https://doi.org/10.1088/1361-648X/abfdf1
Saghayezhian, M., Wang, Z., Howe, D., Siwakoti, P., Plummer, E. W., Zhu, Y., and Zhang, Jiandi. Fri .
"Formation of dislocations via misfit strain across interfaces in epitaxial BaTiO 3 and SrIrO 3 heterostructures". United Kingdom. https://doi.org/10.1088/1361-648X/abfdf1.
@article{osti_1835427,
title = {Formation of dislocations via misfit strain across interfaces in epitaxial BaTiO 3 and SrIrO 3 heterostructures},
author = {Saghayezhian, M. and Wang, Z. and Howe, D. and Siwakoti, P. and Plummer, E. W. and Zhu, Y. and Zhang, Jiandi},
abstractNote = {Dislocations often occur in thin films with large misfit strain as a result of strain energy accumulation and can drastically change the film properties. Here the structure and dislocations in oxide heterostructures with large misfit strain are investigated on atomic scale. When grown on SrTiO3 (001), the dislocations in both the monolithic BaTiO3 thin film and its superlattices with SrIrO3 appear above a critical thickness around 6 nm. The edge component of the dislocations is seen in both cases with the Burgers vector of a $\langle$100$\rangle$. However, compared to monolithic BaTiO3, the dislocation density is slightly lower in BaTiO3/SrIrO3 superlattices. In the superlattice, when considering the SrTiO3 lattice constant as the reference, BaTiO3 has a larger misfit strain comparing with SrIrO3. It is found that in both cases, the formation of dislocation is only affected by the critical thickness of the film with larger lattice misfit (BaTiO3), regardless of the existence of a strong octahedral tilt/rotation mismatch at BaTiO3/SrIrO3 interface. Our findings suggest that it is possible to control the position of dislocations, an important step toward defect engineering.},
doi = {10.1088/1361-648X/abfdf1},
journal = {Journal of Physics. Condensed Matter},
number = 27,
volume = 33,
place = {United Kingdom},
year = {Fri May 28 00:00:00 EDT 2021},
month = {Fri May 28 00:00:00 EDT 2021}
}
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