Structural and physical properties of Re substituted B-site ordered and disordered SrCo{sub 1-x}Re{sub x}O{sub 3-{delta}} (x=0.1, 0.25, 0.5)

Journal Article · Wed Feb 15 00:00:00 EST 2012 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.12.017· OSTI ID:21612918

Baszczuk, A ^[1]; Dabrowski, B; Kolesnik, S; Chmaissem, O ^[2]; Avdeev, M ^[3]

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1. Wroclaw University of Technology, Institute of Materials Science and Applied Mechanics, 50-370 Wroclaw (Poland)
2. Department of Physics, Northern Illinois University, DeKalb, IL 60115 (United States)
3. Bragg Institute, Australian Nuclear Science and Technology Organization, Menai, NSW 2234 (Australia)

Synthesis conditions, structural, magnetic and transport properties have been studied for SrCo{sub 1-x}Re{sub x}O{sub 3-{delta}} samples with x=0.1, 0.25, 0.5. SrCo{sub 0.9}Re{sub 0.1}O{sub 3-{delta}} forms in air and remains stable on cooling indicating that small amounts of Re{sup 7+} stabilize a B-site disordered Pm-3m phase inhibiting formation of a hexagonal phase observed for SrCoO{sub 3-{delta}}. After oxygenation SrCo{sub 0.9}Re{sub 0.1}O{sub 2.94} becomes ferromagnetic below 125 K and shows metallic-like conductivity with moderate magnetoresistance at low temperatures. Fully oxygenated double perovskite Sr{sub 2}CoReO{sub 6} (x=0.5) forms under reducing conditions and is tetragonal at room temperature. A hysteretic transition to the antiferromagnetic state at low temperatures ({approx}50-60 K) is coupled with a drastic change of electronic and thermal properties. Contrary to previous reports [A. Nag et al., Chem. Mater. 20(13) (2008) 4420-4424] SrCo{sub 0.75}Re{sub 0.25}O{sub 3} is not a partially cation ordered Sr{sub 4}Co{sub 3}ReO{sub 12} phase, but a mixture of two structural and magnetic phases with disordered SrCo{sub 1-xd}Re{sub xd}O{sub 3} and ordered SrCo{sub 1-xo}Re{sub xo}O{sub 3} compositions where xd>0.1 and xo<0.5. - Graphical abstract: Neutron diffraction pattern for SrCo{sub 0.75}Re{sub 0.25}O{sub 3}. SrCo{sub 0.75}Re{sub 0.25}O{sub 3} is not a partially cation ordered Sr{sub 4}Co{sub 3}ReO{sub 12} phase, but a mixture of two structural and magnetic phases with disordered SrCo{sub 1-xd}Re{sub xd}O{sub 3} and ordered SrCo{sub 1-xo}Re{sub xo}O{sub 3} compositions where xd>0.1 and xo<0.5. Highlights: Black-Right-Pointing-Pointer SrCo{sub 0.9}Re{sub 0.1}O{sub 2.94} is a B-site disordered cubic Pm-3m phase. Black-Right-Pointing-Pointer SrCo{sub 0.9}Re{sub 0.1}O{sub 2.94} is ferromagnetic below 125 K with metallic-like conductivity. Black-Right-Pointing-Pointer Sr{sub 2}CoReO{sub 6} is tetragonal at room temperature and antiferromagnetic below {approx}50-60 K. Black-Right-Pointing-Pointer SrCo{sub 0.75}Re{sub 0.25}O{sub 3} is not a partially cation ordered Sr{sub 4}Co{sub 3}ReO{sub 12} phase. Black-Right-Pointing-Pointer SrCo{sub 0.75}Re{sub 0.25}O{sub 3} is a mixture of disordered and ordered perovskites.

• OSTI ID: 21612918
• Journal Information: Journal of Solid State Chemistry, Vol. 186; Other Information: DOI: 10.1016/j.jssc.2011.12.017; PII: S0022-4596(11)00687-6; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

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37 INORGANIC
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PHYSICAL AND ANALYTICAL CHEMISTRY
ANTIFERROMAGNETISM
MAGNETORESISTANCE
NEUTRON DIFFRACTION
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THERMODYNAMIC PROPERTIES
COHERENT SCATTERING
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ELECTRIC CONDUCTIVITY
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OXIDE MINERALS
PEROVSKITES
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