Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 182, Issue 4, Pages 709-715Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2008.12.012
Keywords
Fluorite-related oxide; Lanthanide; Magnetic susceptibility; Specific heat; Antiferromagnetic transition
Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [20550052]
- Grants-in-Aid for Scientific Research [20550052] Funding Source: KAKEN
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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.
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