Microstructures of La1-xAx(A = Ca or Sr)MnO3-δ thin films by liquid-delivery metalorganic chemical vapor deposition

Y. Xin, K. Han, N. Mateeva, H. Garmestani, P. N. Kalu, K. H. Dahmen

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The microstructure of La1-xAx(A = Ca or Sr)MnO3-δ thin films grown by liquid-delivery metalorganic chemical vapor deposition on (001) MgO and (110)pseudo-cubic LaAlO3 were studied by transmission electron microscopy. The La1-xCaxMnO3-δ thin film on large lattice mismatched MgO exhibited very defective microstructures and consisted of two typical regions. The first region was close to the film-substrate interface and had an epitaxial relationship to the substrate with many differently oriented domains nucleated on the substrate surface. The second region consisted of columnar grains with some degree of texture. In contrast, the smaller lattice-mismatched La1-xSrxMnO3-δ/(110)pseudo-cubic LaAlO3 film had good crystalline quality with highly oriented columnar grains but exhibited complicated dislocation structures. Apart from the misfit dislocations formed at the film-substrate interface, two types of anomalous dislocations with limited contribution to relieving misfit stresses were also observed. One type of dislocation had extra planes in the film and some climbed into the substrate. These dislocations were considered to form from dislocation loops during nucleation of the film. The other type of dislocations had extra planes parallel to the film-substrate interface and glided into the substrate side resulting in a 2° tilt of the film with respect to the substrate. The complicated dislocation configurations present in the sample were related to the complex strain field in the film. The relative strains along the interface measured in the film were heterogeneous. The variations of the strains in the film were related to the local Curie temperature changes and second-order phase transitions of the film.

Original languageEnglish
Pages (from-to)3073-3083
Number of pages11
JournalJournal of Materials Research
Volume16
Issue number11
Publication statusPublished - 1 Nov 2001
Externally publishedYes

Fingerprint

Metallorganic chemical vapor deposition
metalorganic chemical vapor deposition
delivery
Thin films
microstructure
Microstructure
Liquids
liquids
thin films
Substrates
Dislocations (crystals)
stress relieving
Curie temperature
Nucleation
textures
Textures
Phase transitions
nucleation
Crystalline materials
Transmission electron microscopy

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Xin, Y., Han, K., Mateeva, N., Garmestani, H., Kalu, P. N., & Dahmen, K. H. (2001). Microstructures of La1-xAx(A = Ca or Sr)MnO3-δ thin films by liquid-delivery metalorganic chemical vapor deposition. Journal of Materials Research, 16(11), 3073-3083.

Microstructures of La1-xAx(A = Ca or Sr)MnO3-δ thin films by liquid-delivery metalorganic chemical vapor deposition. / Xin, Y.; Han, K.; Mateeva, N.; Garmestani, H.; Kalu, P. N.; Dahmen, K. H.

In: Journal of Materials Research, Vol. 16, No. 11, 01.11.2001, p. 3073-3083.

Research output: Contribution to journalArticle

Xin, Y, Han, K, Mateeva, N, Garmestani, H, Kalu, PN & Dahmen, KH 2001, 'Microstructures of La1-xAx(A = Ca or Sr)MnO3-δ thin films by liquid-delivery metalorganic chemical vapor deposition', Journal of Materials Research, vol. 16, no. 11, pp. 3073-3083.
Xin, Y. ; Han, K. ; Mateeva, N. ; Garmestani, H. ; Kalu, P. N. ; Dahmen, K. H. / Microstructures of La1-xAx(A = Ca or Sr)MnO3-δ thin films by liquid-delivery metalorganic chemical vapor deposition. In: Journal of Materials Research. 2001 ; Vol. 16, No. 11. pp. 3073-3083.
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