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Issue 23, 2015
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Antisite-disorder, magnetic and thermoelectric properties of Mo-rich Sr2Fe1−yMo1+yO6 (0 ≤ y ≤ 0.2) double perovskites

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Abstract

Structure analysis using X-ray and neutron powder diffraction and elemental mapping has been used to demonstrate that nominal A-site deficient Sr2−xFeMoO6−δ (0 ≤ x ≤ 0.5) compositions form as Mo-rich Sr2Fe1−yMo1+yO6 (0 ≤ y ≤ 0.2) perovskites at high temperatures and under reducing atmospheres. These materials show a gradual transition from the Fe and Mo rock salt ordered double perovskite structure to a B-site disordered arrangement. Analysis of the fractions of B–O–B’ linkages revealed a gradual increase in the number of Mo–O–Mo linkages at the expense of the ferrimagnetic (FIM) Fe–O–Mo linkages that dominate the y = 0 material. All samples contain about 10–15% antiferromagnetic (AF) Fe–O–Fe linkages, independent of the degree of B-site ordering. The magnetic susceptibility of the y = 0.2 sample is characteristic of a small domain ferrimagnet (Tc ∼ 250 K), while room temperature neutron powder diffraction demonstrated the presence of G-type AF ordering linked to the Fe–O–Fe linkages (mFe = 1.25(7)μB). The high temperature thermoelectric properties are characteristic of a metal with a linear temperature dependence of the Seebeck coefficient, S (for all y) and electrical resistivity ρ (y ≥ 0.1). The largest thermoelectric power factor S2/ρ = 0.12 mW m−1 K−1 is observed for Sr2FeMoO6 at 1000 K.

Graphical abstract: Antisite-disorder, magnetic and thermoelectric properties of Mo-rich Sr2Fe1−yMo1+yO6 (0 ≤ y ≤ 0.2) double perovskites

  • This article is part of the themed collection: Perovskites
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Publication details

The article was received on 27 Oct 2014, accepted on 05 Dec 2014 and first published on 05 Dec 2014


Article type: Paper
DOI: 10.1039/C4DT03307H
Citation: Dalton Trans., 2015,44, 10621-10627
  • Open access: Creative Commons BY license
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    Antisite-disorder, magnetic and thermoelectric properties of Mo-rich Sr2Fe1−yMo1+yO6 (0 ≤ y ≤ 0.2) double perovskites

    S. R. Popuri, D. Redpath, G. Chan, R. I. Smith, O. Cespedes and J. G. Bos, Dalton Trans., 2015, 44, 10621
    DOI: 10.1039/C4DT03307H

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