Abstract
A series of Sm and Mn co-doped nanoparticles are synthesized through ethylene glycol assisted sol–gel route to study the impact of both rare earth ions and Mn on the structural, magnetic and low temperature electronic behaviour in LaFeO3. The Rietveld analysis of X-ray diffraction data shows a single phase nature of the nanoparticle with distorted orthorhombic crystal structure. The unit cell volume reduces with increasing Mn, is due to the ionic radii differences between the cations which cause crystal lattice contraction because of the distortion of Fe/MnO6 octahedra. Mostly, particles are agglomerated with an average particle size of 38.5 nm. From the XPS spectra, the existence of multivalence state of both Fe and Mn are obtained. This multiple state of transition metal ions along with Sm are expected to play a major role in the magnetic interactions and other related properties. A drastic magnetic disorder phase is acquired by the modified systems at low temperature as compared to the pure G-Type LaFeO3. Furthermore, the modified nanoparticle shows a colossal dielectric response (> 103 at 100 Hz) and the obtained dielectric relaxation follows mostly non-Debye type which is further confirmed through explicit modulus spectra analysis. From the impedance, modulus and ac-conductivity analysis, the conduction processes in the modified systems reveal a possible N-type and P-type polaronic conduction for both the grain and grain boundary.
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Some of the data generated during this study are included in this article. The rest datasets generated during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
Author is thankful to the Prof. Tsunehiro Takeuchi from Toyota Technological Institute Nagoya Japan, for providing the magnetic measurements using QD PPMS with VSM option.
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TL: Performed the samples preparation, measurements and paper redaction. AS: Performed the dielectric measurements and contributed to the discussion of the dielectric properties. SS: Performed the magnetic measurements.SD: Writing original draft, Investigations and Supervision.
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Lakshmana Rao, T., Sahoo, A.K., Singh, S. et al. Impact of coexisting ions on the structure and functional properties in LaFeO3 nanoparticle. J Mater Sci: Mater Electron 34, 1758 (2023). https://doi.org/10.1007/s10854-023-11151-w
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DOI: https://doi.org/10.1007/s10854-023-11151-w