|
|||||
|
|
Synthesis and properties of Ba3NaRu2O9−δ and Ba3(Na, R)Ru2O9−δ (R=rare earth) crystals |
|
| Authors: | H. Samata M. Kai T. Uchida M. Ohtsuka G. Tanaka S. Sawada T. Taniguchi Y. Nagata |
| Affiliation: | a Faculty of Mercantile Marine Science, Kobe University of Mercantile Marine, Fukaeminami, Higashinada, Kobe 658-0022, Japan b Tokyo Institute of Polytechnics, Iiyama, Atsugi, Kanagawa 243-0297, Japan c College of Science and Engineering, Aoyama Gakuin University, 6-16-1 Chitosedai, Setagaya, Tokyo 157-8572, Japan |
| Abstract: | Crystals of Ba3NaRu2O9−δ (δ≈0.5) and Ba3(Na, R)Ru2O9−δ (R=Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and Yb) were grown by an electrochemical method, and their crystallographic, magnetic, and electric properties were studied. All crystals have a hexagonal structure of space group P63mmc. Ba3NaRu2O9−δ and Ba3(Na, R)Ru2O9−δ (except Ce) have a negative asymptotic Curie temperature suggesting the existence of an antiferromagnetic order; however, they are paramagnetic at temperatures above 1.7 K. Ba3NaRu2O9−δ has an effective magnetic moment Peff of 0.91 μB, while Peff of Ba3(Na, R)Ru2O9−δ (except Ce) reflects the large free-ion moment of the rare earth ions. Ba3(Na, Ce)Ru2O9−δ shows peculiar magnetic behavior that differs from the magnetism of other Ba3(Na, R)Ru2O9−δ crystals. The resistivity of all crystals exhibits an activation-type temperature dependence with an activation energy in the range of 0.10.2 eV. |
| Keywords: | Rare earth compounds Transition metal compounds Crystal growth Crystal structure Magnetic measurements |
| 本文献已被 ScienceDirect 等数据库收录！ | |