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Properties of Gd2O3 nanoparticles studied by hyperfine interactions and magnetization measurements

Authors :
E. L. Correa
B. Bosch-Santos
F. H. M. Cavalcante
B. S. Correa
R. S. Freitas
A. W. Carbonari
M. P. A. Potiens
Source :
AIP Advances, Vol 6, Iss 5, Pp 056112-056112-7 (2016)
Publication Year :
2016
Publisher :
AIP Publishing LLC, 2016.

Abstract

The magnetic behavior of Gd2O3 nanoparticles, produced by thermal decomposition method and subsequently annealed at different temperatures, was investigated by magnetization measurements and, at an atomic level, by perturbed γ − γ angular correlation (PAC) spectroscopy measuring hyperfine interactions at 111In(111Cd) probe nuclei. Nanoparticle structure, size and shape were characterized by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM). Magnetization measurements were carried out to characterize the paramagnetic behavior of the samples. XRD results show that all samples crystallize in the cubic-C form of the bixbyite structure with space group Ia3. TEM images showed that particles annealed at 873 K present particles with highly homogeneous sizes in the range from 5 nm to 10 nm and those annealed at 1273 K show particles with quite different sizes from 5 nm to 100 nm, with a wide size distribution. PAC and magnetization results show that samples annealed at 873 and 1273 K are paramagnetic. Magnetization measurements show no indication of blocking temperatures for all samples down to 2 K and the presence of antiferromagnetic correlations.

Subjects

Subjects :
Physics
QC1-999

Details

Language :
English
ISSN :
21583226
Volume :
6
Issue :
5
Database :
Directory of Open Access Journals
Journal :
AIP Advances
Publication Type :
Academic Journal
Accession number :
edsdoj.99c72c357d95425bb2dc6bfc77ebbfed
Document Type :
article
Full Text :
https://doi.org/10.1063/1.4943601