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- Title
Effect of Er<sup>3+</sup> substitution on structural and magnetic properties of narrow size distributed ZnFe<sub>2−x</sub>Er<sub>x</sub>O<sub>4</sub> nanoparticles.
- Authors
Shoba, M.; Kaleemulla, S.; Krishnamoorthi, C.; Rao, G. Venugopal
- Abstract
Rare-earth ion (Er3+) substituted ZnFe2−xErxO4 nanoparticles at different Er concentrations (x = 0, 0.2, 0.4, 0.6, and 0.8) were synthesized by surfactant (polyethylene glycol) assisted co-precipitation method and studied for structural and magnetic properties of the synthesized nanoparticles. All the ZnFe2−xErxO4 ferrite nanoparticles exhibited an average size of around 25 nm. It was observed that substituent Er3+ predominantly occupy octahedral sublattice in spinel structure. The crystal lattice unit cell volume and magnetic disorder increased with increase of Er3+ concentration. The magnetic parameters such as spin-glass or superparamagnetic blocking temperature (TB), maximum magnetization (Mmax), remnant magnetization (Mr) and coercive field (Hc) of the ZnFe2−xErxO4 ferrite nanoparticles decreased with decreasing temperature (3-300 K). High and low magnetizations were observed for the nanoparticles at 3 K and 300 K, respectively. The observed magnetic properties were explained clearly by considering the substitution of Er3+ ion in to the octahedral sub-lattice and diminishing the magnetic exchange interactions between Fe3+ ions with [Ar] 3d5 and Er3+ ions with [Xe] 4f11 5d10 electronic configurations. The present studies confirm that Er3+ substitution does not enhance magnetic properties of ZnFe2O4 nanoferrites.
- Subjects
ERBIUM; FERRITES; MAGNETIC properties; SUPERPARAMAGNETIC materials; MAGNETIC properties of nanoparticles; ELECTRON configuration; CRYSTAL lattices; UNIT cell
- Publication
Applied Physics A: Materials Science & Processing, 2019, Vol 125, Issue 3, p1
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-019-2454-7