Structure and magnetic properties of hexagonal perovskite-type rare-earth vanadium germanides REVGe3 (RE = La-Nd)

被引：14

作者：

Bie, Haiying ^{[1
]}

Mar, Arthur ^{[1
]}

机构：

[1] Univ Alberta, Dept Chem, Edmonton, AB T6G 2G2, Canada

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2009年 / 19卷 / 34期

基金：

加拿大自然科学与工程研究理事会;

关键词：

CRYSTAL-STRUCTURE; LN=LA-ND; FERROMAGNET; R=LA; CE; SM;

D O I：

10.1039/b908781h

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：

The ternary rare-earth vanadium germanides REVGe3 (RE = La-Nd) have been synthesized by arc-melting and annealing at 800 degrees C for 3 weeks. Their crystal structures were determined by powder X-ray diffraction and refined by the Rietveld method. The hexagonal cell parameters are a = 6.2587(3)-6.2145(2) angstrom and c = 5.6992(3)-5.6403(2) angstrom in the progression from LaVGe3 to NdVGe3. Like the previously known chromium-containing series RECrGe3, they adopt a hexagonal perovskite-type structure, in which chains of face-sharing VGe6 octahedra are connected by triangular Ge-3 clusters. Except for Pauli paramagnetic LaVGe3, magnetic measurements revealed weak antiferromagnetic ordering at low temperatures (T-N = 4-15 K) for the other RE members, in contrast to the ferromagnetic ordering found earlier in RECrGe3. An investigation of the solid solutions LaV1-xCrxGe3 (0 <= x <= 1) and LaCr1-xMnxGe3 (0 <= x <= 0.2) revealed that addition of V or Mn into LaCrGe3 tends to suppress the ferromagnetic ordering.

引用

页码：6225 / 6230

页数：6