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Title: Atomistic structure of misfit dislocations in SrZrO{sub 3}/SrTiO{sub 3} interfaces

Abstract

The atomistic structure of misfit dislocations at heterointerfaces between two ionic crystals with the perovskite structure, SrZrO{sub 3} and SrTiO{sub 3}, is investigated. The interfaces were fabricated by metal-organic deposition of SrZrO{sub 3} layers on (001) SrTiO{sub 3} single crystal substrates. Under appropriate conditions the SrZrO{sub 3} layer grows epitaxially, with its crystal lattice parallel to the lattice of the substrate (cube-on-cube orientation relationship). In the layer/substrate interface a square network of dislocations accommodates the misfit between corresponding spacings in the two crystals. These misfit dislocations have edge character, <010> line directions, and <100> Burgers vectors parallel to the interface. The SrZrO{sub 3}/SrTiO{sub 3} interface has been imaged with the misfit dislocations in end-on projection by high-resolution transmission electron microscopy and also by high-resolution scanning transmission electron microscopy. Quantitative image analysis has shown that a (002) layer of TiO{sub 2} terminates the SrTiO{sub 3} crystal, and the SrZrO{sub 3} crystal commences with a (002) layer of Sr-O. Concerning the {l_brace}200{r_brace} layers normal to the interface it was found that in interface regions of good match, between the misfit dislocations, the perovskite structure continues straight through the interface: Sr-O layers of SrTiO{sub 3} continue as Sr-O layers of SrZrO{sub 3}, andmore » TiO{sub 2} layers continue as ZrO{sub 2} layers. Where the misfit dislocations reside, however, in regions of poor match, a lateral offset exists between the two crystals and disrupts the perovskite structure on the core plane (the symmetry plane) of the misfit dislocations a (200) TiO{sub 2} layer of SrTiO{sub 3} continues as a (200) SrO layer in SrZrO{sub 3}.« less

Authors:
;  [1];  [1];  [1];  [2]
  1. Max-Planck-Inst. fuer Metallforschung, Stuttgart (Germany)
  2. Oak Ridge National Lab., TN (United States). Solid State Div.
Publication Date:
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
328278
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 47; Journal Issue: 1; Other Information: PBD: 11 Dec 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; STRONTIUM OXIDES; ZIRCONIUM OXIDES; TITANIUM OXIDES; COMPOSITE MATERIALS; INTERFACES; DISLOCATIONS; BURGERS VECTOR; MICROSCOPY

Citation Formats

Ernst, F, Ruehle, M, Recnik, A, Jozef Stefan Inst. Ljubljana, Langjahr, P A, Univ. Karlsruhe, Nellist, P D, and Univ. of Birmingham. Atomistic structure of misfit dislocations in SrZrO{sub 3}/SrTiO{sub 3} interfaces. United States: N. p., 1998. Web. doi:10.1016/S1359-6454(98)00334-6.
Ernst, F, Ruehle, M, Recnik, A, Jozef Stefan Inst. Ljubljana, Langjahr, P A, Univ. Karlsruhe, Nellist, P D, & Univ. of Birmingham. Atomistic structure of misfit dislocations in SrZrO{sub 3}/SrTiO{sub 3} interfaces. United States. https://doi.org/10.1016/S1359-6454(98)00334-6
Ernst, F, Ruehle, M, Recnik, A, Jozef Stefan Inst. Ljubljana, Langjahr, P A, Univ. Karlsruhe, Nellist, P D, and Univ. of Birmingham. Fri . "Atomistic structure of misfit dislocations in SrZrO{sub 3}/SrTiO{sub 3} interfaces". United States. https://doi.org/10.1016/S1359-6454(98)00334-6.
@article{osti_328278,
title = {Atomistic structure of misfit dislocations in SrZrO{sub 3}/SrTiO{sub 3} interfaces},
author = {Ernst, F and Ruehle, M and Recnik, A and Jozef Stefan Inst. Ljubljana and Langjahr, P A and Univ. Karlsruhe and Nellist, P D and Univ. of Birmingham},
abstractNote = {The atomistic structure of misfit dislocations at heterointerfaces between two ionic crystals with the perovskite structure, SrZrO{sub 3} and SrTiO{sub 3}, is investigated. The interfaces were fabricated by metal-organic deposition of SrZrO{sub 3} layers on (001) SrTiO{sub 3} single crystal substrates. Under appropriate conditions the SrZrO{sub 3} layer grows epitaxially, with its crystal lattice parallel to the lattice of the substrate (cube-on-cube orientation relationship). In the layer/substrate interface a square network of dislocations accommodates the misfit between corresponding spacings in the two crystals. These misfit dislocations have edge character, <010> line directions, and <100> Burgers vectors parallel to the interface. The SrZrO{sub 3}/SrTiO{sub 3} interface has been imaged with the misfit dislocations in end-on projection by high-resolution transmission electron microscopy and also by high-resolution scanning transmission electron microscopy. Quantitative image analysis has shown that a (002) layer of TiO{sub 2} terminates the SrTiO{sub 3} crystal, and the SrZrO{sub 3} crystal commences with a (002) layer of Sr-O. Concerning the {l_brace}200{r_brace} layers normal to the interface it was found that in interface regions of good match, between the misfit dislocations, the perovskite structure continues straight through the interface: Sr-O layers of SrTiO{sub 3} continue as Sr-O layers of SrZrO{sub 3}, and TiO{sub 2} layers continue as ZrO{sub 2} layers. Where the misfit dislocations reside, however, in regions of poor match, a lateral offset exists between the two crystals and disrupts the perovskite structure on the core plane (the symmetry plane) of the misfit dislocations a (200) TiO{sub 2} layer of SrTiO{sub 3} continues as a (200) SrO layer in SrZrO{sub 3}.},
doi = {10.1016/S1359-6454(98)00334-6},
url = {https://www.osti.gov/biblio/328278}, journal = {Acta Materialia},
number = 1,
volume = 47,
place = {United States},
year = {1998},
month = {12}
}