A New Mixed-Valence Ferrite with a Cubic Structure, YBaFe4O7: Spin-Glass-Like Behavior

被引：41

作者：

Caignaert, V. ^{[1
]}

Abakumov, A. M. ^{[2
]}

Pelloquin, D. ^{[1
]}

Pralong, V. ^{[1
]}

Maignan, A. ^{[1
]}

Van Tendeloo, G. ^{[2
]}

Raveau, B. ^{[1
]}

机构：

[1] Univ Caen, Lab CRISMAT, UMR 6508, CNRS ENSICAEN, F-14050 Caen, France

[2] Univ Antwerp, EMAT, B-2020 Antwerp, Belgium

来源：

CHEMISTRY OF MATERIALS | 2009年 / 21卷 / 06期

关键词：

ROOM-TEMPERATURE; TRANSITION; YBACO4O7;

D O I：

10.1021/cm803312f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A new mixed-valence ferrite, YBaFe4O7, has been synthesized. Its unique cubic structure, with a = 8.9595(2) angstrom, is closely related to that of the hexagonal "114" oxides YBaCo4O7 and CaBaFe4O7. It consists of corner-sharing FeO4 tetrahedra, forming triangular and kagome layers parallel to (111)(c). In fact, the YBaFe4O7 and CaBaFe4O7 structures can be described as two different "ccc" and "chch" close packings of [BaO3](infinity) and [O-4](infinity) 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 T-g = 50 K.

引用

页码：1116 / 1122

页数：7

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