Secondary phases in (001)RBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} epitaxial thin films

Samoylenkov, S V; Gorbenko, O Y; Graboy, I E; Kaul, A R; Zandbergen, H W; Connolly, E

doi:10.1021/cm991016v

Title: Secondary phases in (001)RBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} epitaxial thin films

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Abstract

The composition and orientation of secondary phases in epitaxial (001)RBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} thin films [where R is a rare earth element] grown by MOCVD were investigated by HREM, XRD, SEM, and other techniques. The observed secondary phases often did not correspond to those expected from equilibrium phase diagrams of bulk R--Ba--Cu--O systems. No evidence was found for the presence of R{sub 2}BaCuO{sub 5} or BaCuO{sub 2}, which are the equilibrium phases with bulk RBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. In contrast, inclusions of well-oriented R{sub 2}CuO{sub 4}(R = Gd), R{sub 2}O{sub 3} (R = Lu, Ho, Y), R{sub 2}Cu{sub 2}O{sub 5}(R = Lu), Ba{sub 2}CuO{sub 3}, and BaCu{sub 3}O{sub 4} were observed, depending on the films' stoichiometry. It is concluded that the formation of coherent or semicoherent interfaces between embedded inclusions and the surrounding matrix is critical for a stabilization of otherwise nonequilibrium oxide phases in epitaxial films. The crystal structure of unstable-in-bulk cuprate BaCu{sub 3}O{sub 4} was determined using electron nanodiffraction of the films' cross sections.

Authors:: Samoylenkov, S V; Gorbenko, O Y; Graboy, I E; Kaul, A R; Zandbergen, H W; Connolly, E

Publication Date:: Wed Sep 01 00:00:00 EDT 1999

Research Org.:: Moscow State Univ. (RU)

OSTI Identifier:: 20001168

Resource Type:: Journal Article

Journal Name:: Chemistry of Materials

Additional Journal Information:: Journal Volume: 11; Journal Issue: 9; Other Information: PBD: Sep 1999; Journal ID: ISSN 0897-4756

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; RARE EARTH COMPOUNDS; BARIUM OXIDES; COPPER OXIDES; THIN FILMS; PHASE DIAGRAMS; CRYSTAL STRUCTURE

Citation Formats


                    Samoylenkov, S V, Gorbenko, O Y, Graboy, I E, Kaul, A R, Zandbergen, H W, and Connolly, E. Secondary phases in (001)RBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} epitaxial thin films.  United States: N. p., 1999. 
        Web.  doi:10.1021/cm991016v.

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                    Samoylenkov, S V, Gorbenko, O Y, Graboy, I E, Kaul, A R, Zandbergen, H W, & Connolly, E. Secondary phases in (001)RBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} epitaxial thin films.  United States.  https://doi.org/10.1021/cm991016v

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                    Samoylenkov, S V, Gorbenko, O Y, Graboy, I E, Kaul, A R, Zandbergen, H W, and Connolly, E. 1999.  
        "Secondary phases in (001)RBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} epitaxial thin films".  United States.  https://doi.org/10.1021/cm991016v.

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@article{osti_20001168,

  title        = {Secondary phases in (001)RBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} epitaxial thin films},

  author       = {Samoylenkov, S V and Gorbenko, O Y and Graboy, I E and Kaul, A R and Zandbergen, H W and Connolly, E},

  abstractNote = {The composition and orientation of secondary phases in epitaxial (001)RBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} thin films [where R is a rare earth element] grown by MOCVD were investigated by HREM, XRD, SEM, and other techniques. The observed secondary phases often did not correspond to those expected from equilibrium phase diagrams of bulk R--Ba--Cu--O systems. No evidence was found for the presence of R{sub 2}BaCuO{sub 5} or BaCuO{sub 2}, which are the equilibrium phases with bulk RBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. In contrast, inclusions of well-oriented R{sub 2}CuO{sub 4}(R = Gd), R{sub 2}O{sub 3} (R = Lu, Ho, Y), R{sub 2}Cu{sub 2}O{sub 5}(R = Lu), Ba{sub 2}CuO{sub 3}, and BaCu{sub 3}O{sub 4} were observed, depending on the films' stoichiometry. It is concluded that the formation of coherent or semicoherent interfaces between embedded inclusions and the surrounding matrix is critical for a stabilization of otherwise nonequilibrium oxide phases in epitaxial films. The crystal structure of unstable-in-bulk cuprate BaCu{sub 3}O{sub 4} was determined using electron nanodiffraction of the films' cross sections.},

  doi          = {10.1021/cm991016v},

  url          = {https://www.osti.gov/biblio/20001168},
  journal      = {Chemistry of Materials},

  issn         = {0897-4756},

  number       = 9,

  volume       = 11,

  place        = {United States},

  year         = {Wed Sep 01 00:00:00 EDT 1999},

  month        = {Wed Sep 01 00:00:00 EDT 1999}

}

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