Abstract
A structural and Mössbauer study of mechanosynthesized EuCr1 − xFexO3 nanocrystalline particles (∼20–30 nm) is presented. The lattice parameters increase with increasing x-value leading to an increasingly distorted structure. The crystallite sizes range between 20 nm and 30 nm. Magnetic and 57Fe Mössbauer measurements show the samples with x < 0.7 to be paramagnetic and those with x ≥ 0.7 to be partially superparamagnetic at 298 K. The 78 K Mössbauer spectra of the samples with x = 0.3–1.0 are composed of well-resolved two sextets that are explicable in terms of the structural model that we recently have proposed for the EuCrO3 nanoparticles according to which the transition metal ions and Eu3 + partly exchange their usual sites in the perovskite-related structure (Widatallah et al. J Phys D Appl Phys 44:265403, 2011). Consequently, the two sextets obtained at 78 K refer to Fe3 + ions at the usual B-octahedral site and the A-dodecahedral site usually occupied by Eu3 + .
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Widatallah, H.M., Al-Shahumi, T.M.H., Gismelseed, A.M. et al. Structural and 57Fe Mössbauer study of EuCr1 − x Fe x O3 nanocrystalline particles. Hyperfine Interact 205, 101–104 (2012). https://doi.org/10.1007/s10751-011-0484-4
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DOI: https://doi.org/10.1007/s10751-011-0484-4