A new mixed-valence ferrite with a cubic structure, YBaF4O 7: Spin-glass-like behavior

V. Caignaert, A. M. Abakumov, D. Pelloquin, V. Pralong, A. Maignan, G. Van Tendeloo, B. Raveaur

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

A new mixed-valence ferrite, YBaFe4O7, has been synthesized. Its unique cubic structure, with a = 8.9595(2) Å, is closely related to that of the hexagonal "114" oxides YBaCo4O 7 and CaBaFe4O7. It consists of corner-sharing FeO4 tetrahedra, forming triangular and kagome layers parallel to (111)c. In fact, the YBaFe4O7 and CaBaFe4O 7 structures can be described as two different "ccc" and "chck" close packings of [BaO3]∞ and [O 4]∞ layers, respectively, whose tetrahedral cavities are occupied by Fe2+/Fe3+ cations. The local structure of YBaFe4O7 is characterized by a large amount of stacking faults originating from the presence of "hexagonal" layers in the "ccc" cubic close-packed YBaFe4O7 structure. In this way, they belong to the large family of spinels and hexagonal ferrites studied for their magnetic properties. Differently from all the ferrites and especially from CaBaFe4O7, which are ferrimagnetic, YBaFe4O7 is an insulating spin glass with Tg = 50 K.

Original languageEnglish
Pages (from-to)1116-1122
Number of pages7
JournalChemistry of Materials
Volume21
Issue number6
DOIs
Publication statusPublished - 24 Mar 2009
Externally publishedYes

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