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10-01-2019 | Ceramics

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

Authors: Erika Tóthová, Róbert Tarasenko, Vladimír Tkáč, Martin Orendáč, Michal Hegedüs, Zuzana Danková, Marián Holub, Matej Baláž, Marek Matik

Published in: Journal of Materials Science | Issue 8/2019

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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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Title: Microcrystalline Gd2MoO6 prepared by combined mechanochemical/thermal process and its magnetic properties
Authors: Erika Tóthová
Róbert Tarasenko
Vladimír Tkáč
Martin Orendáč
Michal Hegedüs
Zuzana Danková
Marián Holub
Matej Baláž
Marek Matik
Publication date: 10-01-2019
Publisher: Springer US
Published in: Journal of Materials Science / Issue 8/2019
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-019-03331-z

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