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Intriguing structural and magnetic properties correlation study on Fe3+-substituted calcium-copper-titanate

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Abstract

This communication presents a detailed study on a Fe3+ modified CaCu3Ti4O12 cubic perovskite system (CaCu3−xTi4−xFe2xO12 with x = 0.0–0.7) by performing X-ray powder diffractometry, DC SQUID magnetization and 57Fe Mössbauer spectroscopy. The first ever Mössbauer studies on the system supported the reported peculiarity of the structure. Mössbauer analysis for the compositions x = 0.1, 0.3, and 0.5 suggest Fe3+ ions in two different environments. The site with larger quadrupole splitting corresponds to Fe3+ in the octahedral symmetry, while the site with lower chemical shift and quadrupole splitting belongs to Fe3+ in the square-planar (A′-) configuration. With the increase in Fe-substitution, Fe3+ appears to prefer A′- symmetry. Antiferromagnetic features are retained up to x = 0.3, but weak ferromagnetic characteristics appear with higher Fe3+ substitution. The switching of antiferromagnetic to ferromagnetic behavior was related to the preferential occupation of Fe3+ in square-planar symmetry accommodating Cu2+.

Graphical abstract: Intriguing structural and magnetic properties correlation study on Fe3+-substituted calcium-copper-titanate

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Publication details

The article was received on 29 Sep 2017, accepted on 11 Dec 2017 and first published on 12 Dec 2017


Article type: Paper
DOI: 10.1039/C7CP06681C
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    Intriguing structural and magnetic properties correlation study on Fe3+-substituted calcium-copper-titanate

    P. R. Pansara, P. Y. Raval, N. H. Vasoya, S. N. Dolia and K. B. Modi, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C7CP06681C

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