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Microcrystalline Gd2MoO6 prepared by combined mechanochemical/thermal process and its magnetic properties

Abstract

Gadolinium oxymolybdate, Gd2MoO6 (monoclinic, C2/c) was prepared via nonconventional mechanochemical/thermal process from powdered oxide precursors (Gd2O3 and (NH4)2MoO4). The effect of mechanical activation via high-energy ball milling on the reactivity of the stoichiometric Gd2O3 + (NH4)2MoO4 mixture was studied by thermal analysis (TG-DSC) and Fourier-transform infrared spectroscopy. While thermal treatment of nonactivated mixture leads only to decomposition of (NH4)2MoO4 and formation of Gd2O3–MoO3 system, mechanical activation provides enough energy for a chemical reaction between both reactants. The product with an average crystallite size of approximately 1 μm shows a well-faceted morphology. The investigation of magnetic properties revealed antiferromagnetic coupling, which is attributed to exchange interactions.

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Acknowledgements

The present work is supported by the projects of Slovak Grant Agency VEGA (2/0175/17, 2/0044/18) and APVV (14-0073, 14-0103).

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Correspondence to Erika Tóthová.

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Tóthová, E., Tarasenko, R., Tkáč, V. et al. Microcrystalline Gd2MoO6 prepared by combined mechanochemical/thermal process and its magnetic properties. J Mater Sci 54, 6111–6121 (2019). https://doi.org/10.1007/s10853-019-03331-z

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  • DOI: https://doi.org/10.1007/s10853-019-03331-z