| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7757655 | Journal of Solid State Chemistry | 2018 | 6 Pages |
Abstract
Polycrystalline Ca2Fe2-xGaxO5 brownmillerite samples of nominal xâ¯=â¯0.5, 0.7, 0.9 and 1 compositions have been synthesized by solid state reaction under normal pressure conditions. Whatever x is, room temperature structural analyses by Rietveld refinements and electron microscopy techniques highlight a centrosymmetric Pnma space group. Furthermore, STEM-HAADF observations point towards a preferential Ga occupation at the tetrahedral sites of the structure in agreement with the Rietveld analyses. The magnetic dilution by a diamagnetic cation is responsible for the TN decrease revealed by magnetization measurements and allows a spin flop transition to be observed.128
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Authors
C. Moussa, L. Monnier, D. Pelloquin, A. Maignan,