STEM beam channeling in BaSnO3/LaAlO3 perovskite bilayers and visualization of 2D misfit dislocation network

Hwanhui Yun; Abhinav Prakash; Bharat Jalan; Jong Seok Jeong; K. Andre Mkhoyan

doi:10.1016/j.ultramic.2019.112863

STEM beam channeling in BaSnO3/LaAlO3 perovskite bilayers and visualization of 2D misfit dislocation network

Materials Science 2019-11-12 v1

Authors: Hwanhui Yun , Abhinav Prakash , Bharat Jalan , Jong Seok Jeong , K. Andre Mkhoyan

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

A study of the STEM probe channeling in a heterostructures crystalline specimen is presented here with a goal to guide appropriate STEM-based characterization for complex structures. STEM analysis of perovskite BaSnO3/LaAlO3 bilayers is performed and the dominating effects of beam channeling on HAADF- and LAADF-STEM are illustrated. To study the electron beam propagating through BaSnO3/LaAlO3 bilayers, probe intensity depth profiles are calculated, and the effects of probe defocus and atomic column alignment are discussed. Characteristics of the beam channeling are correlated to resulting ADF-STEM images, which is then tested by comparing focal series of plan-view HAADF-STEM images to those recorded experimentally. Additionally, discussions on how to visualize the misfit dislocation network at the BaSnO3/LaAlO3 interface using HAADF- and LAADF-STEM images are provided.

Keywords

STEM beam channeling perovskite bilayers misfit dislocation network HAADF-STEM

Cite

@article{arxiv.1906.05923,
  title  = {STEM beam channeling in BaSnO3/LaAlO3 perovskite bilayers and visualization of 2D misfit dislocation network},
  author = {Hwanhui Yun and Abhinav Prakash and Bharat Jalan and Jong Seok Jeong and K. Andre Mkhoyan},
  journal= {arXiv preprint arXiv:1906.05923},
  year   = {2019}
}

Comments

23 pages, 8 figures

STEM beam channeling in BaSnO3/LaAlO3 perovskite bilayers and visualization of 2D misfit dislocation network

Abstract

Keywords

Cite

Comments

Related papers