TY - JOUR
T1 - The oxygen deficient cubic perovskite SrFe1-xSc xO3-δ (x ≤ 0.5; 0.1 ≤ δ ≤ 0.5)
T2 - Structural features and physical properties
AU - Rizki, Youssef
AU - Bréard, Yohann
AU - Le Breton, Jean Marie
AU - Folcke, Emeric
AU - Lechevallier, Luc
AU - Kobayashi, Wataru
AU - Maignan, Antoine
PY - 2010/9
Y1 - 2010/9
N2 - Solid state synthesis method has been used to stabilize oxygen deficient perovskite phases SrFe1-xScxO3-δ (0 ≤ x ≤ 0.5). The good homogeneity of samples is confirmed by energy dispersive spectroscopy (EDS) analysis performed with a transmission electronic microscope (TEM). By combining X-ray and electronic diffraction (ED), it is demonstrated that the cationic substitution on the B site of the perovskite induces a decrease of the oxygen content but without inducing long range ordering phenomenon. On this basis, X-ray patterns of compounds were indexed in the cubic Pm3m space group. The oxidation states of iron evidenced by Mössbauer spectroscopy, are in good agreement with the oxygen stoichiometries determined by cerimetric titration. In the SrFe1-xScxO 3-δ series, the Fe3+/Fe4+ origin of the electronic conductivity is clearly evidenced. The limit compound SrFe 0.5Sc0.5O2.5 is highly resistive and characterized by a cluster glass-like behaviour. Finally, negative magnetoresistivity properties are revealed for the x = 0.1 and x = 0.2 samples, reaching -10% around the magnetic transition temperature in a 7T magnetic field.
AB - Solid state synthesis method has been used to stabilize oxygen deficient perovskite phases SrFe1-xScxO3-δ (0 ≤ x ≤ 0.5). The good homogeneity of samples is confirmed by energy dispersive spectroscopy (EDS) analysis performed with a transmission electronic microscope (TEM). By combining X-ray and electronic diffraction (ED), it is demonstrated that the cationic substitution on the B site of the perovskite induces a decrease of the oxygen content but without inducing long range ordering phenomenon. On this basis, X-ray patterns of compounds were indexed in the cubic Pm3m space group. The oxidation states of iron evidenced by Mössbauer spectroscopy, are in good agreement with the oxygen stoichiometries determined by cerimetric titration. In the SrFe1-xScxO 3-δ series, the Fe3+/Fe4+ origin of the electronic conductivity is clearly evidenced. The limit compound SrFe 0.5Sc0.5O2.5 is highly resistive and characterized by a cluster glass-like behaviour. Finally, negative magnetoresistivity properties are revealed for the x = 0.1 and x = 0.2 samples, reaching -10% around the magnetic transition temperature in a 7T magnetic field.
KW - Iron valence state
KW - Magnetoresistance
KW - Perovskites
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U2 - 10.1016/j.solidstatesciences.2010.07.019
DO - 10.1016/j.solidstatesciences.2010.07.019
M3 - Article
AN - SCOPUS:77956058272
VL - 12
SP - 1661
EP - 1666
JO - Solid State Sciences
JF - Solid State Sciences
SN - 1293-2558
IS - 9
ER -