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

Autor:	Victor Duffort, Antoine Maignan, B. Raveau, Tapati Sarkar, Valerie Pralong, Vincent Caignaert, C. R. Serrao
Rok vydání:	2012
Předmět:	Spin glass Materials science Magnetism chemistry.chemical_element General Chemistry Manganese Oxygen Crystallography Magnetization Nuclear magnetic resonance chemistry Desorption Materials Chemistry Ferrite (magnet) Substitution effect
Zdroj:	Journal of Materials Chemistry. 22:18923
ISSN:	1364-5501 0959-9428
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cf8b7a6e77c01a4a4e1e28af64f5dd33 https://doi.org/10.1039/c2jm33456a Zobrazit plný text záznamu