EXAFS Study of Double Perovskite (Sr2-xCax)FeMoO6 (0 ≤ x ≤ 2.0) and Sr2CrMO6 (M = Mo, W) Systems

被引：4

作者：

Chan, T. S. ^{[1
]}

Lee, J. -F. ^{[1
]}

Liu, R. S.

机构：

[1] Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan

来源：

14TH INTERNATIONAL CONFERENCE ON X-RAY ABSORPTION FINE STRUCTURE (XAFS14), PROCEEDINGS | 2009年 / 190卷

关键词：

ABSORPTION FINE-STRUCTURE; MAGNETORESISTANCE; MAGNETIZATION; TEMPERATURE; SR2FEMOO6; TRANSPORT; HALIDES;

D O I：

10.1088/1742-6596/190/1/012095

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The local structure of the double perovskite (Sr2-xCax) FeMoO6 (0 <= x <= 2.0) and Sr2CrMO6 (M = Mo, W) systems have been probed by extended X-ray absorption fine structure (EXAFS) spectroscopy at the Fe and Cr K-edges. It was found that the Fe-O distance decreases from 1.999(7) angstrom (x = 0) to 1.991(1) angstrom (x = 1.0) in (Sr2-xCax)FeMoO6 with a tetragonal phase (I4/m). When the x value is further increased from 1.5 to 2.0, the Fe-O bond distance decreases from 2.034(5) to 2.012(4) angstrom with a monoclinic phase (P2(1)/n). On the other hand, Cr-O, Cr-Sr and Cr-W bond distances in Sr2CrWO6 are all slightly longer than the corresponding bond distances in Sr2CrMoO6, which is attributable to the larger ionic radius of W5+ (0.62 angstrom) than Mo5+ (0.61 angstrom).

引用

页数：4

共 18 条

[1] Magnetoresistance in the double perovskite Sr2CrMoO6 [J].