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Structure and magnetism in the oxygen-deficient perovskites Ce1−xSrxCoO3−δ (x ≥ 0.90) |
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| Authors: | M James KS Wallwork DJ Goossens J Horvat M Colella |
| Affiliation: | a Bragg Institute, Building 58, Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234, Australia b Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia c Department of Physics, Australian National University, Canberra, ACT 0200, Australia d Institute for Superconducting and Electronic Materials, University of Wollongong, NSW 2522, Australia e Materials and Engineering Sciences, Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234, Australia |
| Abstract: | We have examined the structure and phase behaviour of strontium-doped Ce1−xSrxCoO3−δ and found that the perovskite form is stabilised over a relatively narrow solid solution range (x > 0.85). A combination of electron, powder X-ray and neutron diffraction has revealed tetragonal superstructures of the basic perovskite unit; (I4/mmm) 2ap × 2ap × 4ap (x = 0.90) and (P4/mmm) ap × ap × 2ap (x = 0.95). Magnetisation measurements show ferromagnetic behaviour under applied magnetic fields. Low temperature neutron diffraction of Ce0.10Sr0.90CoO2.80 in zero field reveals a magnetic cell of dimension 2ap × 2ap × 4ap with an ordered cobalt moment of 1.7 B.M. at 25 K. |
| Keywords: | A Oxides B Sol-gel chemistry C Electron diffraction D Magnetic properties |
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