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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.)

Synthesis and atomic scale characterization of Er2O3 nanoparticles: enhancement of magnetic properties and changes in the local structure

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Author(s):
Correa, Eduardo L. [1] ; Bosch-Santos, Brianna [1] ; Freitas, Rafael S. [2] ; Potiens, Maria da Penha A. [1] ; Saiki, Mitiko [1] ; Carbonari, Artur W. [1]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Inst Pesquisas Energet & Nucl, Sao Paulo - Brazil
[2] Univ Sao Paulo, Inst Fis, Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Nanotechnology; v. 29, n. 20 MAY 18 2018.
Web of Science Citations: 1
Abstract

In the investigation reported in this paper a modified thermal decomposition method was developed to produce very small Er2O3 nanoparticles (NPs). Particles structure, shape and size were characterized by x-ray diffraction and transmission electron microscopy which showed that the synthesis by thermal decomposition under O-2 atmosphere produced very small and monodisperse NPs, allowing the investigation of finite-size and surface effects. Results of magnetization measurements showed that the smallest particles present the highest values of susceptibility that decrease as particle size increases. Specific heat measurements indicate that the sample with the smallest NPs (diameter similar to 5 nm) has a Neel temperature of 0.54 K. The local structure of particles was investigated by measurements of hyperfine interactions with perturbed angular correlation spectroscopy using Cd-111 as probe nuclei replacing the cationic sites. Results showed that the relative population of sites 8b increases in both the core and surface layer of particles. (AU)

FAPESP's process: 15/16191-5 - The research in new materials involving high magnetic fields and low temperatures
Grantee:Gennady Gusev
Support type: Research Projects - Thematic Grants
FAPESP's process: 14/14001-1 - Project and construction of a digital spectrometer:A more eficient equipment to investigate materials using PAC technique
Grantee:Rajendra Narain Saxena
Support type: Regular Research Grants