Dependence of crystal symmetry, electrical conduction property and electronic structure of LnFeO3 (Ln: La, Pr, Nd, Sm) on kinds of Ln3+

被引:15
作者
Niwa, Eiki [1 ]
Sato, Tsubasa [1 ]
Watanabe, Yuki [1 ]
Toyota, Yuichiro [1 ]
Hatakeyama, Yoshikiyo [1 ]
Judai, Ken [1 ]
Shozugawa, Katsumi [2 ]
Matsuo, Motoyuki [2 ]
Hashimoto, Takuya [1 ]
机构
[1] Nihon Univ, Coll Humanities & Sci, Dept Phys, Setagaya Ku, Tokyo 1568550, Japan
[2] Univ Tokyo, Grad Sch Arts & Sci, Dept Multidisciplinary Sci, Meguro Ku, Tokyo 1538902, Japan
关键词
Perobskite-type oxide; X-ray diffraction; Electrical conductivity; Mossbauer spectroscopy; Diffuse reflecrance spectroscopy; Crystallite symmetry; Electrical conduction property; Electronic structure; OXYGEN NONSTOICHIOMETRY; LAFEO3; POWDERS; GAS SENSORS; EXPANSION; FILMS;
D O I
10.2109/jcersj2.123.501
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Dependence of crystal symmetry, electrical conductivity, chemical state of Fe and optical property of LnFeO(3) (Ln: La, Pr, Nd, Sm) on kinds of Ln(3+) was investigated. All the LnFeO(3) showed orthorhombic structure, with which order of high crystal symmetry was LaFeO3 > PrFeO3 > NdFeO3 > SmFeO3. Using tolerance factor, the order was successfully explained. The electrical conductivity of all the specimens could be explained by using small polaron hopping model. With increasing crystallite symmetry, electrical conductivity increased and activation energy for hopping conduction decreased. This can be ascribed to larger overlapping of Fe3d orbital and O2p orbital on nearly linear Fe-O-Fe bond in LnFeO(3) with higher crystal symmetry. The larger overlapping of Fe3d orbital and O2p orbital in LnFeO(3) with higher crystal symmetry can also be an origin of larger spin-spin interaction detected by Mossbauer spectroscopy and larger optical band gap observed by diffuse reflectance spectroscopy. Since chemical state of Fe, evaluated by Mossbauer spectroscopy, in LnFeO(3) is fundamentally constant at +3 regardless of kinds of Ln(3+), carrier concentration of LnFeO(3) was revealed to be constant. It is concluded that the predominant factor which determine the electrical property of LnFeO(3) is mobility affected by crystal symmetry. (C) 2015 The Ceramic Society of Japan. All rights reserved.
引用
收藏
页码:501 / 506
页数:6
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