Perovskite phases and phasoids in Sm{sub 1-x}Sr{sub x}CuO{sub 2.5-x/2+{delta}} PLD thin films
Journal Article
·
· Journal of Solid State Chemistry
- Universite de Caen Boulevard du Marechal Juin (France)
- Thomas J. Watson Research Center, Yorktown Heights, NY (United States)
The pulsed laser deposition technique has been used for the thin film synthesis of new perovskite-type phases and phasoids in the Sm{sub 1-x}Sr{sub x}CuO{sub 2.5-x/2+{delta}} systems. The films are grown on [001] SrTiO{sub 3} substrates, and are observed to be preferentially oriented, with the c-axis aligned normal to the substrate, and single-phased over a relatively wide composition range (0.5 {le} x {le} 1). HREM studies of the films show the presence of a wide variety of structural arrangements as a function of composition which are related to the basic infinite-layer structure of SrCuO{sub 2}. In addition to an ordered phase for x = 0.75, which has been previously reported, other structures which accommodate excess oxygen to partially compensate for the mixed valence are also observed. These include intercalation of oxygen between the [CuO{sub 2}]{sub {infinity}} layers, introduction of novel rock salt-type ribbons, and double layers of edge-sharing CuO{sub 4} groups.
- OSTI ID:
- 70178
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 116; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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Thu Dec 30 23:00:00 EST 1993
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OSTI ID:111258