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

• DOI: 10.2109/jcersj2.123.501
• Publication Date: 2015-05-31T22:07:46Z
• Authors: Eiki NIWA; Tsubasa SATO; Yuki WATANABE; Yuichiro TOYOTA; Yoshikiyo HATAKEYAMA; Ken JUDAI; Katsumi SHOZUGAWA; Motoyuki MATSUO; Takuya HASHIMOTO
• Keywords: Orthorhombic crystal system; Crystal (programming language)

Dependence of crystal symmetry, electrical conductivity, chemical state Fe and optical property LnFeO3 (Ln: La, Pr, Nd, Sm) on kinds Ln3+ was investigated. All the showed orthorhombic structure, with which order high symmetry LaFeO3 > PrFeO3 NdFeO3 SmFeO3. Using tolerance factor, successfully explained. The conductivity all specimens could be explained by using small polaron hopping model. With increasing crystallite increased activation energy for conduction decreased. This can ascribed to larger overlapping Fe3d orbital O2p nearly linear Fe–O–Fe bond in higher symmetry. also an origin spin–spin interaction detected Mössbauer spectroscopy band gap observed diffuse reflectance spectroscopy. Since Fe, evaluated spectroscopy, is fundamentally constant at +3 regardless Ln3+, carrier concentration revealed constant. It concluded that predominant factor determine mobility affected