Structural, electrochemical and magnetic characterization of the layered-type PrBa{sub 0.5}Sr{sub 0.5}Co{sub 2}O{sub 5+δ} perovskite

Kim, Jung H.; Irvine, John T.S.

doi:10.1016/J.JSSC.2014.03.008

Title: Structural, electrochemical and magnetic characterization of the layered-type PrBa{sub 0.5}Sr{sub 0.5}Co{sub 2}O{sub 5+δ} perovskite

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Abstract

Structural, electrical and magnetic properties of the layered cobaltite PrBa{sub 0.5}Sr{sub 0.5}Co{sub 2}O{sub 5+δ} have been investigated by means of neutron diffraction, electron diffraction, thermogravimetric analysis and SQUID magnetometry. Rietveld analysis of neutron diffraction data shows the ordered distribution of oxygen vacancies in [PrO{sub δ}] planes which doubles the lattice parameters from the simple perovskite cell parameter as a≈2a{sub p} and c≈2a{sub p} (a{sub p} is the cell parameter of the simple Perovskite) yielding tetragonal symmetry in the P4/mmm space group. On heating, above 573 K in air, structural rearrangement takes place and the structure can be defined as a≈a{sub p} and c≈2a{sub p} in the same space group. Oxygen occupancies have been determined as a function of temperature from neutron diffraction results. Initially (≥373 K), oxygen occupancy was increased and then decreased with increasing temperature. It was found that at 973 K the total oxygen loss is calculated about 0.265 oxygen/formula unit. Oxygen vacancy ordering was observed below 573 K, and the oxygen occupancy decreases as cell volume increases with increasing temperature. Area specific resistance (ASR) measurements show a resistance of 0.153 Ωcm{sup 2} and 0.286 Ωcm{sup 2} at 973 K and 923 K, respectively. On cooling, paramagnetic tomore »« less

Authors:

Kim, Jung H. ^[1]; Irvine, John T.S. ^[2]

Department of Applied Materials Science and Engineering, Hanbat National University, San 16-1, Dukmyung-Dong, Yusung-Gu, Daejeon 305-719 (Korea, Republic of)
School of Chemistry, University of St Andrews, Fife KY16 9ST (United Kingdom)

Publication Date:: Thu May 01 00:00:00 EDT 2014

OSTI Identifier:: 22334231

Resource Type:: Journal Article

Journal Name:: Journal of Solid State Chemistry

Additional Journal Information:: Journal Volume: 213; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANTIFERROMAGNETISM; ELECTRON DIFFRACTION; LATTICE PARAMETERS; MAGNETIC PROPERTIES; NEUTRON DIFFRACTION; OXYGEN; PARAMAGNETISM; PEROVSKITE; SOLID SOLUTIONS; SPACE GROUPS; TEMPERATURE DEPENDENCE; TETRAGONAL LATTICES; THERMAL GRAVIMETRIC ANALYSIS

Citation Formats


                    Azad, Abul K., E-mail: abul.azad@ubd.edu.bn, Faculty of Integrated Technologies, Universiti Brunei Darussalam, Gadong BE 1410, Kim, Jung H., and Irvine, John T.S. Structural, electrochemical and magnetic characterization of the layered-type PrBa{sub 0.5}Sr{sub 0.5}Co{sub 2}O{sub 5+δ} perovskite.  United States: N. p., 2014. 
        Web.  doi:10.1016/J.JSSC.2014.03.008.

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                    Azad, Abul K., E-mail: abul.azad@ubd.edu.bn, Faculty of Integrated Technologies, Universiti Brunei Darussalam, Gadong BE 1410, Kim, Jung H., & Irvine, John T.S. Structural, electrochemical and magnetic characterization of the layered-type PrBa{sub 0.5}Sr{sub 0.5}Co{sub 2}O{sub 5+δ} perovskite.  United States.  https://doi.org/10.1016/J.JSSC.2014.03.008

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                    Azad, Abul K., E-mail: abul.azad@ubd.edu.bn, Faculty of Integrated Technologies, Universiti Brunei Darussalam, Gadong BE 1410, Kim, Jung H., and Irvine, John T.S. 2014.  
        "Structural, electrochemical and magnetic characterization of the layered-type PrBa{sub 0.5}Sr{sub 0.5}Co{sub 2}O{sub 5+δ} perovskite".  United States.  https://doi.org/10.1016/J.JSSC.2014.03.008.

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@article{osti_22334231,

  title        = {Structural, electrochemical and magnetic characterization of the layered-type PrBa{sub 0.5}Sr{sub 0.5}Co{sub 2}O{sub 5+δ} perovskite},

  author       = {Azad, Abul K., E-mail: abul.azad@ubd.edu.bn and Faculty of Integrated Technologies, Universiti Brunei Darussalam, Gadong BE 1410 and Kim, Jung H. and Irvine, John T.S.},

  abstractNote = {Structural, electrical and magnetic properties of the layered cobaltite PrBa{sub 0.5}Sr{sub 0.5}Co{sub 2}O{sub 5+δ} have been investigated by means of neutron diffraction, electron diffraction, thermogravimetric analysis and SQUID magnetometry. Rietveld analysis of neutron diffraction data shows the ordered distribution of oxygen vacancies in [PrO{sub δ}] planes which doubles the lattice parameters from the simple perovskite cell parameter as a≈2a{sub p} and c≈2a{sub p} (a{sub p} is the cell parameter of the simple Perovskite) yielding tetragonal symmetry in the P4/mmm space group. On heating, above 573 K in air, structural rearrangement takes place and the structure can be defined as a≈a{sub p} and c≈2a{sub p} in the same space group. Oxygen occupancies have been determined as a function of temperature from neutron diffraction results. Initially (≥373 K), oxygen occupancy was increased and then decreased with increasing temperature. It was found that at 973 K the total oxygen loss is calculated about 0.265 oxygen/formula unit. Oxygen vacancy ordering was observed below 573 K, and the oxygen occupancy decreases as cell volume increases with increasing temperature. Area specific resistance (ASR) measurements show a resistance of 0.153 Ωcm{sup 2} and 0.286 Ωcm{sup 2} at 973 K and 923 K, respectively. On cooling, paramagnetic to ferromagnetic and an incomplete ferromagnetic to antiferromagnetic transition takes place. Different behaviours in field cooled and zero-field-cooled measurements leads to a coexistence of ferromagnetic and antiferromagnetic order. - Graphical abstract: Structural phase changes in PrBa{sub 0.5}Sr{sub 0.5}Co{sub 2}O{sub 5+δ} at elevated temperatures determined by neutron powder diffraction. Depending on oxygen occupancy it form different phases at different temperatures. This pictures show the schematic 3D diagram of PrBa{sub 0.5}Sr{sub 0.5}Co{sub 2}O{sub 5+δ} at 295 K (a), 373 K (b) and 573 K (c). Co atoms are inside the octahedra/pyramid. Ba and Sr occupy the same site. Oxygens are in the corner of polyhedra. - Highlights: • Structural phase changes at high temperatures. • Ordered distribution of oxygen vacancies below 573 K. • Double Perovskite type structure below 373 K in the P4/mmm space group. • Structural changes have direct correlation with conductivity. • Low area specific resistance at 973 K.},

  doi          = {10.1016/J.JSSC.2014.03.008},

  url          = {https://www.osti.gov/biblio/22334231},
  journal      = {Journal of Solid State Chemistry},

  issn         = {0022-4596},

  number       = ,

  volume       = 213,

  place        = {United States},

  year         = {Thu May 01 00:00:00 EDT 2014},

  month        = {Thu May 01 00:00:00 EDT 2014}

}

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