Premium
Successive Charge Transitions of Unusually High‐Valence Fe 3.5+ : Charge Disproportionation and Intermetallic Charge Transfer
Author(s) -
Hosaka Yoshiteru,
Denis Romero Fabio,
Ichikawa Noriya,
Saito Takashi,
Shimakawa Yuichi
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201700881
Subject(s) - disproportionation , intermetallic , valence (chemistry) , charge (physics) , materials science , charge ordering , nial , oxide , condensed matter physics , chemistry , crystallography , chemical physics , atomic physics , physics , metallurgy , catalysis , biochemistry , organic chemistry , alloy , quantum mechanics
A perovskite‐structure oxide containing unusually high‐valence Fe 3.5+ was obtained by high‐pressure synthesis. Instability of the Fe 3.5+ in Ca 0.5 Bi 0.5 FeO 3 is relieved first by charge disproportionation at 250 K and then by intermetallic charge transfer between A‐site Bi and B‐site Fe at 200 K. These previously unobserved successive charge transitions are due to competing intermetallic and disproportionation charge instabilities. Both transitions change magnetic and structural properties significantly, indicating strong coupling of charge, spin, and lattice in the present system.