Structural Ordering and Ferromagnetism in La4Mn4O11
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- 作者：M. L. Ruiz-Gonzá ; lez ; R. Corté ; s-Gil ; J. M. Alonso ; A. Hernando ; M. Vallet-Regí ; J. M. Gonzá ; lez-Calbet
- 刊名：Chemistry of Materials
- 出版年：2006
- 出版时间：November 28, 2006
- 年：2006
- 卷：18
- 期：24
- 页码：5756 - 5763
- 全文大小：903K
- 年卷期：v.18,no.24(November 28, 2006)
- ISSN：1520-5002
文摘
Electron diffraction and high-resolution electron microscopy of LaMnO3-
(0 
0.25), obtainedby topotactic reduction of LaMnO3, shows that an ordered pathway of anionic vacancies is only obtainedfor = 0.25. La4Mn4O11 is an eightfold superlattice of the perovskite-type structure due to the orderedintergrowth of three octahedral layers and one tetrahedral layer along the b axis, according to the sequence...OOOTOOOT'... The reduced sample exhibits ferromagnetic behavior with Tc 
50 K. The staircaseeffect, observed at low temperature, is discussed in terms of the magnetic ordering adopted in the octahedrallayers.
(0 0.25), obtainedby topotactic reduction of LaMnO3, shows that an ordered pathway of anionic vacancies is only obtainedfor = 0.25. La4Mn4O11 is an eightfold superlattice of the perovskite-type structure due to the orderedintergrowth of three octahedral layers and one tetrahedral layer along the b axis, according to the sequence...OOOTOOOT'... The reduced sample exhibits ferromagnetic behavior with Tc 50 K. The staircaseeffect, observed at low temperature, is discussed in terms of the magnetic ordering adopted in the octahedrallayers.