Properties of Gd2O3 nanoparticles studied by hyperfine interactions and magnetization measurements
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 interactio...
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doaj-99c72c357d95425bb2dc6bfc77ebbfed2020-11-25T00:37:42ZengAIP Publishing LLCAIP Advances2158-32262016-05-0165056112056112-710.1063/1.4943601081691ADVProperties of Gd2O3 nanoparticles studied by hyperfine interactions and magnetization measurementsE. L. Correa0B. Bosch-Santos1F. H. M. Cavalcante2B. S. Correa3R. S. Freitas4A. W. Carbonari5M. P. A. Potiens6Instituto de Pesquisas Energéticas e Nucleares, University of São Paulo, 05508-000, São Paulo, BrazilInstituto de Pesquisas Energéticas e Nucleares, University of São Paulo, 05508-000, São Paulo, BrazilInstituto de Pesquisas Energéticas e Nucleares, University of São Paulo, 05508-000, São Paulo, BrazilFaculdade de Ciências Exatas e Tecnologia, Federal University of Pará, 68440-000, Abaetetuba, PA, BrazilInstituto de Física, University of São Paulo, CP 66318, 05314-970, São Paulo, SP, BrazilInstituto de Pesquisas Energéticas e Nucleares, University of São Paulo, 05508-000, São Paulo, BrazilInstituto de Pesquisas Energéticas e Nucleares, University of São Paulo, 05508-000, São Paulo, BrazilThe 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.http://dx.doi.org/10.1063/1.4943601 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
E. L. Correa B. Bosch-Santos F. H. M. Cavalcante B. S. Correa R. S. Freitas A. W. Carbonari M. P. A. Potiens |
spellingShingle |
E. L. Correa B. Bosch-Santos F. H. M. Cavalcante B. S. Correa R. S. Freitas A. W. Carbonari M. P. A. Potiens Properties of Gd2O3 nanoparticles studied by hyperfine interactions and magnetization measurements AIP Advances |
author_facet |
E. L. Correa B. Bosch-Santos F. H. M. Cavalcante B. S. Correa R. S. Freitas A. W. Carbonari M. P. A. Potiens |
author_sort |
E. L. Correa |
title |
Properties of Gd2O3 nanoparticles studied by hyperfine interactions and magnetization measurements |
title_short |
Properties of Gd2O3 nanoparticles studied by hyperfine interactions and magnetization measurements |
title_full |
Properties of Gd2O3 nanoparticles studied by hyperfine interactions and magnetization measurements |
title_fullStr |
Properties of Gd2O3 nanoparticles studied by hyperfine interactions and magnetization measurements |
title_full_unstemmed |
Properties of Gd2O3 nanoparticles studied by hyperfine interactions and magnetization measurements |
title_sort |
properties of gd2o3 nanoparticles studied by hyperfine interactions and magnetization measurements |
publisher |
AIP Publishing LLC |
series |
AIP Advances |
issn |
2158-3226 |
publishDate |
2016-05-01 |
description |
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. |
url |
http://dx.doi.org/10.1063/1.4943601 |
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