Structure and magnetism in the oxygen-deficient perovskites Ce1−xSrxCoO3−δ (x≥0.90)
2005; Elsevier BV; Volume: 40; Issue: 8 Linguagem: Inglês
10.1016/j.materresbull.2005.03.025
ISSN1873-4227
AutoresM. James, Kia S. Wallwork, Ray L. Withers, D. J. Goossens, K.F. Wilson, J. Horvat, Xiaolin Wang, Michael Colella,
Tópico(s)Thermal Expansion and Ionic Conductivity
ResumoWe 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.
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