Preparation of iron(IV) nitridoferrate Ca4FeN4 through azide-mediated oxidation under high-pressure conditions

Simon D. Kloß*, Arthur Haffner, Pascal Manuel, Masato Goto, Yuichi Shimakawa, J. Paul Attfield

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Transition metal nitrides are an important class of materials with applications as abrasives, semiconductors, superconductors, Li-ion conductors, and thermoelectrics. However, high oxidation states are difficult to attain as the oxidative potential of dinitrogen is limited by its high thermodynamic stability and chemical inertness. Here we present a versatile synthesis route using azide-mediated oxidation under pressure that is used to prepare the highly oxidised ternary nitride Ca4FeN4 containing Fe4+ ions. This nitridometallate features trigonal-planar [FeN3]5− anions with low-spin Fe4+ and antiferromagnetic ordering below a Neel temperature of 25 K, which are characterised by neutron diffraction, 57Fe-Mössbauer and magnetisation measurements. Azide-mediated high-pressure synthesis opens a way to the discovery of highly oxidised nitrides.

Original languageEnglish
Article number571
Number of pages6
JournalNature Communications
Issue number1
Early online date25 Jan 2021
Publication statusE-pub ahead of print - 25 Jan 2021


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