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Type: Artigo
Title: Partial Quenching Of The Magnetic Moments In Polycrystalline Co(al (x) Co1-x )(2)o-4 Samples (0 < X < 0.35)
Author: Oliveira
M. P.; Silva
L. S.; Mercena
S. G.; Coelho
A. A.; Meneses
C. T.; Duque
J. G. S.
Abstract: In this work, the effect of Al3+-doping in polycrystalline Co(Al (x) Co1-x )(2)O-4 samples (< x < 0.35) was studied. Samples have been synthesized via conventional state solid method. X-ray diffraction (XRD) measurements carried out at room temperature reveal that a single cubic phase has been successfully obtained for all samples. Magnetization measurements as function of temperature (2 < T < 300 K) were collected in a commercial DC superconducting quantum interference device magnetometer. The observation of an antiferromagnetic transition for all samples confirms that Co3+ ions located on octahedral sites are low spin (S = 0). On the other hand, the transition temperatures are unaffected by the Co3+-doping indicating that the empty e (g) orbitals does not play an important role in the antiferromagnetic interaction between Co2+ sited on tetrahedral sites. Besides, the evaluation of effective magnetic moment from T-dependence of magnetic susceptibility reveals that the effective moment is not totally quenched. This fact confirms both of the crystal field effects experimented by the Co ions is site-dependent and it is stronger for Co ions located in octahedral sites than tetrahedral ones.
Subject: Cobalt Oxide
Editor: Springer
New York
Citation: Journal Of Superconductivity And Novel Magnetism . Springer, v. 30, p. 587 - 591, 2017.
Rights: fechado
Identifier DOI: 10.1007/s10948-016-3834-2
Date Issue: 2017
Appears in Collections:Unicamp - Artigos e Outros Documentos

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