Issue 36, 2012

Substitution effect of manganese for iron in “114” YBaFe4O7 ferrite: structure, magnetism and oxygen hyperstoichiometry

Abstract

The study of the ferrites YBaFe4−xMnxO7 shows that the substitution of Mn2+ for Fe2+ in YBaFe4O7 stabilizes the hexagonal symmetry at the expense of the cubic one for 1 ≤ x ≤ 2. Using combined measurements of a.c. and d.c. magnetization, we establish that Mn substitution for Fe in YBaFe4O7 leading to a cationic disorder induces a spin glass behaviour. An important characteristic of these Mn substituted ferrites deals with their ability to absorb and desorb reversibly oxygen, leading to the oxides YBaFe4−xMnxO7+δ, with the highest δ values 2–2.25 that have been observed to date in this “114” family. These oxidized “Mn ferrites” keep the hexagonal symmetry and the spin glass characteristic temperature, Tsg, is varying with the oxygen content δ.

Graphical abstract: Substitution effect of manganese for iron in “114” YBaFe4O7 ferrite: structure, magnetism and oxygen hyperstoichiometry

Article information

Article type
Paper
Submitted
29 May 2012
Accepted
12 Jul 2012
First published
13 Jul 2012

J. Mater. Chem., 2012,22, 18923-18929

Substitution effect of manganese for iron in “114” YBaFe4O7 ferrite: structure, magnetism and oxygen hyperstoichiometry

V. Duffort, T. Sarkar, C. R. Serrao, V. Pralong, V. Caignaert, A. Maignan and B. Raveau, J. Mater. Chem., 2012, 22, 18923 DOI: 10.1039/C2JM33456A

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