Abstract
The effect of particle reduction to nanoscale size and substitution of Mn3+ ions for Fe3+ ions on the crystal structure, lattice dynamics, Mössbauer spectra and magnetic properties in NdFe1-xMnxO3 compounds have been studied. X-ray powder diffraction and Raman spectroscopy revealed that the Jahn-Teller distortion of lattice dominates for samples with x > 0.4. The average particle size of NdFeO3 nanoparticles (NAP) increases with annealing at 600°C from about 15 nm to 25 nm. The presence of superparamagnetic particles was indicated by Mössbauer measurements in NdFeO3 NAP system. Sextets in NdFe1-xMnxO3 Mössbauer spectra can be modelled with several local environments of Fe3+ induced by substitution. The reduction of dimensionality and the substitution induce a decrease of the Néel temperature TN1 from 691 K to 544 K for NAP or to 356 K for x = 0.4, however the temperature of spin reorientation TSR increases with substitution. The saturated magnetization obtained at 1.9 K increases and ferromagnetic component is removed below TSR with the substitution.
Highlights
The physical and structural properties of NdFeO3 are widely studied and they attract large attention due to interesting magnetic properties such as spin-reorientation phase transition [1]
Crystal structure of all samples was investigated by X-ray powder diffraction (XRD) technique on different diffractometers always in the Bragg-Brentano geometry
XRD on NdFeO3 nanoparticles was studied by a D8 (Bruker) diffractometer using Cu Kα1,α2 doublet radiation
Summary
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