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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Magnetic, structural and cation distribution studies on FeO center dot Fe(2-x)NdxO3 (x=0.00, 0.02, 0.04, 0.06 and 0.1) nanoparticles

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Author(s):
Araujo, W. W. R. [1] ; Araujo, J. F. D. F. [2] ; Oliveira, C. L. P. [1] ; Brito, G. E. S. [1] ; Figueiredo Neto, A. M. [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Inst Phys, Rua Matao 1371, BR-05508090 Sao Paulo, SP - Brazil
[2] Pontifical Catholic Univ Rio de Janeiro, Dept Phys, Rio De Janeiro, RJ - Brazil
Total Affiliations: 2
Document type: Journal article
Source: EUROPEAN PHYSICAL JOURNAL E; v. 42, n. 12 DEC 2019.
Web of Science Citations: 0
Abstract

We synthesized and characterized the colloidal suspensions of FeO center dot Fe(2-x) NdxO3 nanoparticles with x = 0.00, 0.02, 0.04, 0.06 and 0.1. The effect of the Fe3+ ion replacement by Nd3+ on the crystal structure is in-depth studied. The samples were characterized by the following techniques: X-ray diffraction (XRD), UV-Vis spectrophotometry, transmission electronic microscopy (TEM), small-angle X-ray scattering (SAXS), magnetization as a function of applied magnetic field (M-H loops) and magnetization as a function of temperature in zero-field-cooled and field-cooled regimes (ZFC-FC). From XRD cation distribution, structural parameters were extracted. The increasing in the bandgap is interpreted as a result of the higher interatomic separation with the doping. TEM micrographs reveal a polydisperse size and shape distribution of particles. The results for the volume-weighted average diameter measured by SAXS are consistent with those determined by XRD. From the M-H loops we found that the superparamagnetic (SPM) regime contributes with 95-97% for all samples, while only 3-5% contribution comes from the paramagnetic (PM) regime. The saturation magnetization increases in a steady manner upon increasing the Nd3+ ion molar ratio from 0.00 up to 0.06, reaching the maximum value of 105.8 +/- 0.4 Am-2/kg at x = 0.06. It is worth to mention that the result for the saturation magnetization value are higher than that of the bulk material. (AU)

FAPESP's process: 14/50983-3 - INCT 2014: complex fluids
Grantee:Antonio Martins Figueiredo Neto
Support Opportunities: Research Projects - Thematic Grants