We have studied the A-site substitution effect on the structural, thermal, and magnetic properties of the infinite layer iron oxide AFeO2 (A = alkali-earth elements) with an FeO4 square-planar coordination. Together with the previous study showing a total substitution by Ca, Ba substitution is found to be tolerable up to 30%, presenting almost the same substitutional range as that found in ACuO2 under high pressure. Notably, Ba substitution shows little influence on the magnetic properties, in contrast to expectations from first principles calculations. The temperature at which oxidation to an AFeO2.5 phase occurs and its transformation rate show a wide variation tunable solely by the out-of-plane distance.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry