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Updated: Jul 31, 2025
08:45
Fabrication of Spatially Confined Complex Oxides
Published on: July 1, 2013
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CaFeFeNbO6 - an iron-based double double perovskite
K Ji1, J R Bedward1, Q Li1
1Centre for Science at Extreme Conditions (CSEC) and School of Chemistry, The University of Edinburgh, EH9 3FD, UK. j.p.attfield@ed.ac.uk.
Chemical Communications (Cambridge, England)
|May 5, 2023
Summary
The first Fe-based double perovskite, CaFeFeNbO6, exhibits spin glass magnetism due to cation disorder. Higher synthesis pressures are needed to create new ordered double perovskites with smaller A cations.
Area of Science:
- Materials Science
- Solid State Chemistry
- Magnetism
Background:
- Cation ordering in ABO3 perovskites influences material properties.
- AA'BB'O6 double perovskites offer tunable electronic and magnetic characteristics.
- Fe-based double perovskites are underexplored compared to other transition metals.
Purpose of the Study:
- To synthesize and characterize the first Fe-based AA'BB'O6 double perovskite, CaFeFeNbO6.
- To investigate the impact of cation disorder on magnetic properties.
- To explore synthesis conditions for future double double perovskites.
Main Methods:
- High-pressure synthesis techniques.
- X-ray diffraction for structural analysis.
- Magnetic susceptibility measurements to probe magnetic ordering.
Main Results:
- CaFeFeNbO6 was successfully synthesized as an ordered double double perovskite.
- Significant antisite disorder (37%) was observed between Fe3+ and Nb5+ cations.
- Spin glassy magnetism was detected below a freezing transition at 12 K.
- The CaMnFeNbO6 analogue also displayed cation disorder and spin glass behavior.
Conclusions:
- Cation disorder significantly impacts magnetic properties in Fe-based double perovskites.
- Achieving high cation order in related materials may require pressures of 14-18 GPa.
- This work paves the way for discovering new double double perovskites with tailored magnetic functionalities.
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