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Type: Artigo de periódico
Title: Thermal annealing effects on the magnetic behavior of Ce2NiSi3
Author: Rojas, DP
Fernandez, JR
Espeso, JI
Sal, JCG
da Silva, LM
Gandra, FG
dos Santos, AO
Medina, AN
Abstract: We have investigated the crystallographic, magnetic and thermodynamic properties of the as-cast and annealed Ce2NiSi3 alloys, crystallizing in the AlB2-type hexagonal structure. The DC-magnetic susceptibility data show that the as-cast sample exhibits an antiferromagnetic (AFM) ordering below T-N = 3.8 K, whereas the annealed sample shows, at 4.2 K, a magnetic transition of AFM nature and, around 2.5 K, an additional anomaly. The specific heat shows a peak with c(max) = 7.4 J/mol K at 3.8 K for the as cast sample, which shifts to lower temperatures when the magnetic field increases, consistent with the antiferromagnetic nature of the transition. On the other hand, in the annealed alloy, the maximum of the specific heat peak reaches 9.3 J/mol K at 4.2 K, and no additional anomalies were observed. The different magnetic behavior between the as-cast and annealed samples is attributed to thermal effects on the structural disorder of nickel and silicon atoms, as already observed in other isotypic R2TSi3 alloys, where R = U or Ce, and T = transition metal. (C) 2010 Elsevier B.V. All rights reserved.
Subject: Ce2NiSi3
Specific heat
Heat treatment
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.jmmm.2010.05.059
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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