Abstract
A different processing route to bimetallic oxynitrides has been developed using oxide precursors generated from coprecipitation of ethanolic solutions of the relevant metal chlorides. The nitridation of the mixed-metal precursors yields nanocrystalline oxynitrides. Representative group 5–group 6 transition metal oxynitrides, M1−xM′x(O,N) (M = Nb, Ta; M′ = Mo, W) have been prepared and characterised by powder X-ray diffraction (PXD), scanning electron microscopy with energy dispersive analysis by X-rays (SEM/EDAX), transmission electron microscopy (TEM) with selected area electron diffraction (SAED), BET surface area measurements and SQUID magnetometry. The mixed-metal oxynitrides form rock salt structures (a ∼4.3 Å) with disordered distributions of both cations and anions. The purity, particle size and surface area of materials are significantly dependent on nitridation temperature.
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Acknowledgements
The authors would like to Ms N Bock and Dr FJ Allison for assistance with SEM and TEM measurements. DHG and WY would like to thank the Royal Society for awarding WY a Sino-British Fellowship and for funding this work. DHG would also like to thank the EPSRC for the award of an Advanced Research Fellowship.
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Wang, Y., Lesterb, E. & Gregory, D.H. A study on the synthesis and characterisation of nanocrystalline transition metal oxynitrides . J Mater Sci 42, 6779–6786 (2007). https://doi.org/10.1007/s10853-006-1464-y
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DOI: https://doi.org/10.1007/s10853-006-1464-y