ISIS Neutron and Muon Source Data Journal

Crystal and Magnetic Structures of Unusually High Valence Fe Materials

Abstract: Highly oxidized iron oxides such as SrFe4+O3, CaFe4+O3, and CaCu3Fe4O12 display unusual electronic and magnetic behaviors due to the highly covalent nature of the Fe-O interaction. Topochemical oxidation using high oxygen pressures leads to the formation of a new phase with composition Ca2FeCoO6. Magnetisation data show this material is ferrimagnetic with a transition temperature of approximately 220 K. We have used high temperatures and pressures to make oxygen stoichiometric Ca0.5Bi0.5FeO3 which shows novel charge ordering transitions at 200 and 250 K. We therefore request 2 days on GEM in order to characterize the two above materials. A standard 10-300 K CCR will be sufficient to record diffraction patterns as a function of temperature from a 1 g sample of Ca2FeCoO5 (~5 hours) and a 0.1 g sample of the high pressure Ca0.5Bi0.5FeO3 product (~43 hours).

Principal Investigator: Professor Paul Attfield
Experimenter: Mr Yoshiteru Hosaka
Experimenter: Dr Graham McNally
Experimenter: Dr Yuichi Shimakawa
Experimenter: Dr Takashi Saito
Local Contact: Dr Ivan da Silva Gonzalez
Experimenter: Dr Fabio Denis Romero

DOI: 10.5286/ISIS.E.RB1620030

ISIS Experiment Number: RB1620030

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Professor Paul Attfield et al; (2016): Crystal and Magnetic Structures of Unusually High Valence Fe Materials, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1620030

Data is released under the CC-BY-4.0 license.