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

• DOI: 10.1007/s10853-019-03331-z
• Publication Date: 2019-01-10T14:15:40Z
• Authors: Erika Tóthová; Róbert Tarasenko; Vladimír Tkáč; Martin Orendáč; Michal Hegedüs; Zuzana Danková; Marián Holub; Matej Baláž; Marek Matik
• Keywords: Microcrystalline

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.