Abstract
Magnetic properties of perovskite oxides, SrSn1-x Fe x O3-δ (x ≤ 0.15), substituted with nonmagnetic Ca and Ti ions were studied. XRD patterns showed the orthorhombic structure (close to tetragonal) of (Sr1-y Ca y )(Sn1-x Fe x )O3-δ and Sr(Sn1-x-y Fe x Ti y )O3-δ . The cell volumes decreased with the increase of Ca and Ti doping rates. Although Ti-substituted Sr(Sn, Fe)O3-δ showed small saturation magnetizations as compared with non-Ti substituted one, the magnetization increased a little with Ti doping rates up to 15%. On the other hand, all Ca-substituted Sr(Sn, Fe)O3-δ showed larger saturation magnetization than non-Ca substituted one. Two doublets of Fe3+ and a doublet of Fe4+ were observed in Mössbauer spectra of Ca-substituted Sr(Sn, Fe)O3-δ with weak ferromagnetism, and two sextets of high spin Fe3+ were additionally observed in Mössbauer spectra of Ca-doped Sr(Sn, Fe)O3-δ with relatively strong ferromagnetism. When Sr(Sn, Fe)O3-δ were further codoped with Ca and Ti ions, they showed the stable and enhanced ferromagnetic properties. It is considered that magnetic polarons among high spin Fe3+ species are overlapped by shrinking or deforming the crystal structure of perovskite oxides. That is the magnetism induced by a chemical pressure of perovskite oxides.
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Authors thank Dr. Norimichi Kojima in The Toyota Physical and Chemical Research Institute for supporting this study.
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This article is part of the Topical Collection on Proceedings of the International Conference on the Applications of the Mössbauer Effect (ICAME 2017), Saint-Petersburg, Russia, 3–8 September 2017
Edited by Valentin Semenov
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Nomura, K., Suzuki, S., Mizunuma, T. et al. Enhanced magnetism of perovskite oxides, Sr(Sn,Fe)O3-δ , by substitution of nonmagnetic Ca and Ti ions. Hyperfine Interact 238, 81 (2017). https://doi.org/10.1007/s10751-017-1443-5
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DOI: https://doi.org/10.1007/s10751-017-1443-5