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).
- Materials Science Division
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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 1041377
- Report Number(s):
- ANL/MSD/JA-73349; JSSCBI; TRN: US201211%%540
- Journal Information:
- Journal of Solid State Chemistry, Vol. 186, Issue Feb. 2012; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- ENGLISH
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