Advantage of low-temperature hydrothermal synthesis to grow stoichiometric crednerite crystals

Maria Poienar (1) , Christine Martin (2) , Oleg Lebedev (2) , Antoine Maignan (2)

1 NIRDElCM - National Institute for Research and Development in Electrochemistry and Condensed Matter
2 CRISMAT - Laboratoire de cristallographie et sciences des matériaux

This work reports a new approach for the growth of stoichiometric crednerite CuMnO2 crystals. The hydrothermal reaction, starting from soluble metal sulphates as precursors, is assisted by ethylene glycol and the formation of crednerite is found to depend strongly on pH and temperature. This method allows obtaining small hexagonal platelets with the larger dimension about 1.0-1.5 mu m and with a composition characterized by a Cu/Mn ratio of 1. Thus, these crystals differ from the needle-like millimetric ones obtained by the flux technique for which the composition departs from the expected one and is close to Cu1.04Mn0.96. This monitoring of the cationic composition in crednerite, using hydrothermal synthesis, is important as the Cu/Mn ratio controls the low temperature antiferromagnetic ground-state. (C) 2018 Elsevier Masson SAS. All rights reserved.

Mots clés: Hydrothermal synthesis; Crednerite; Structural and magnetic properties

Domaines: Matériaux

Maria Poienar, Christine Martin, Oleg Lebedev, Antoine Maignan. Advantage of low-temperature hydrothermal synthesis to grow stoichiometric crednerite crystals. Solid State Sciences, 2018, New Frontiers in Solid State Chemistry: Functional Materials Design under Ambient to Extreme High Pressures, 80, pp.39-45. ⟨10.1016/j.solidstatesciences.2018.03.019⟩. ⟨hal-02174402⟩