Insertion of a two-dimensional iron-chloride network between perovskite blocks.: Synthesis and characterization of the layered oxyhalide, (FeCl)LaNb2O7

被引：28

作者：

Viciu, L

Koenig, J

Spinu, L

Zhou, WL

Wiley, JB ^{[1
]}

机构：

[1] Univ New Orleans, Dept Chem, New Orleans, LA 70148 USA

[2] Univ New Orleans, Adv Mat Res Inst, New Orleans, LA 70148 USA

来源：

CHEMISTRY OF MATERIALS | 2003年 / 15卷 / 07期

关键词：

D O I：

10.1021/cm0208253

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 low-temperature (350 degreesC) ion-exchange reaction was used to insert Fe-Cl layers between the perovskite blocks of a double-layered Dion-Jacobson compound. The product, (FeCl)LaNb2O7, contains iron coordinated by two apical oxygens from the perovskite layer and four in-plane chlorines within the interlayer space. Rietveld structural analysis of X-ray powder diffraction data confirms the formation of the two-dimensional iron-chlorine networks with the iron cations moving slightly off the ideal octahedral coordination. Thermal analyses in oxygen, argon, and hydrogen showed this compound is metastable, decomposing exothermically between 600 and 750 degreesC. Magnetic measurements show Curie-Weiss behavior at higher temperatures consistent with Fe2+ in a high-spin d(6) configuration. At lower temperatures two transitions are observed: below 80 K an antiferromagnetic transition occurs, and below 10 K spins realign in a ferromagnetic fashion.

引用

页码：1480 / 1485

页数：6

共 28 条

[1] X-ray single-crystal structure and magnetic properties of Fe[CH3PO3)]•H2O:: A layered weak ferromagnet [J].