Crystal structures and magnetic properties of fluorite-related oxides Ln3NbO7 (Ln = lanthanides)

被引：74

作者：

Doi, Yoshihiro ^{[1
]}

Harada, Yuka ^{[1
]}

Hinatsu, Yukio ^{[1
]}

机构：

[1] Hokkaido Univ, Grad Sch Sci, Div Chem, Sapporo, Hokkaido 0600810, Japan

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2009年 / 182卷 / 04期

关键词：

Fluorite-related oxide; Lanthanide; Magnetic susceptibility; Specific heat; Antiferromagnetic transition; M = NB; RARE-EARTH; THERMAL-PROPERTIES; PHASE-TRANSITIONS; LN(3)IRO(7) LN; LN(3)REO(7) LN; SM; EU; ND; PR;

D O I：

10.1016/j.jssc.2008.12.012

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Crystal structures and magnetic properties of the ternary oxides Ln(3)NbO(7) (Ln = La, Pr, Nd, Sm-Lu) are reported. Their powder X-ray diffraction measurements and Rietveld analyzes show that they have the fluorite-related structures with space group Pnma (Ln = La, Pr, Nd), C222(1) (Ln = Sm-Tb), or Fm-3m (Ln = Dy-Lu). Magnetic susceptibility measurements were carried out from 1.8 to 400 K. The Ln(3)NbO(7) compounds for Ln = Pr, Gd, Dy-Yb show Curie-Weiss paramagnetic behavior, and Sm3NbO7 and Eu3NbO7 show van Vleck paramagnetism. On the other hand, two magnetic anomalies were observed for both Nd3NbO7 (0.6 and 2.7 K) and Tb3NbO7 (2.0 and 3.2 K). From the results of specific heat measurements, it was found that these anomalies are due to the antiferromagnetic ordering of Ln ions in two different crystallographic sites (the 8-coordinated and 7-coordinated sites). (C) 2008 Elsevier Inc. All rights reserved.

引用

页码：709 / 715

页数：7

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