A structural and Mössbauer study of mechanosynthesized EuCr 1-xFe xO 3 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 EuCrO 3 nanoparticles according to which the transition metal ions and Eu 3+ 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 Fe 3+ ions at the usual B-octahedral site and the A-dodecahedral site usually occupied by Eu 3+.
- Mössbauer spectroscopy
ASJC Scopus subject areas
- Condensed Matter Physics
- Nuclear and High Energy Physics
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry