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Alkoxide route to La0.5Sr0.5CoO3 epitaxial thin films on SrTiO3
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
2008 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 516, no 15, 4673-4678 p.Article in journal (Refereed) Published
Abstract [en]

An all alkoxide based sol–gel route was investigated for preparation of epitaxial La0.5Sr0.5CoO3 (LSCO) films on 100 SrTiO3 (STO) substrates. Films with 20–30 to 80–100 nm thickness were prepared by spin-coating 0.2–0.6 M (metal) solutions on the STO substrates and heat treatment to 800 °C at 2 °C min− 1, 30 min, in air. The films were epitaxial with a cube-on-cube alignment and the LSCO cell was strained to match the STO substrate of 3.905 Å closely; a and b = 3.894 Å and 3.897 Å for the 20–30 and 80–100 nm films, respectively. The c-axis was compressed to 3.789 Å and 3.782 Å for the 20–30 and 80–100 nm films, respectively, which resulted in an almost unchanged cell volume as compared to polycrystalline film and nano-phase powders prepared in the same way. The SEM study showed mainly very smooth, featureless surfaces, but also some defects. A film prepared in the same way on an -Al2O3 substrate was dense and polycrystalline with crystallite sizes in the range 10–50 nm and gave cubic cell dimensions of ac = 3.825 Å. The conductivity of the ca 30–40 nm thick polycrystalline film was 1.7 mΩcm, while the epitaxial 80–100 nm film had a conductivity of around 1.9 mΩcm.

Place, publisher, year, edition, pages
2008. Vol. 516, no 15, 4673-4678 p.
Keyword [en]
LaSeCoO, Perovskite, Epitaxial growth, Sol-gel processing, X-ray diffraction, Structural properties
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-16523DOI: 10.1016/j.tsf.2007.08.033ISI: 000256509100003OAI: oai:DiVA.org:uu-16523DiVA: diva2:44294
Available from: 2008-05-28 Created: 2008-05-28 Last updated: 2017-12-08Bibliographically approved

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Westin, GunnarOttosson, MikaelPohl, Annika

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