Hydrothermal Synthesis of AgCrO2 Delafossite in Supercritical Water: A New Single-Step Process

Sanjay Kumar (1, 2) , Christine Martin (2) , Marinela Miclau (1)

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

It was previously reported that the synthesis of silver based delafossites as pure phases is challenging and requires more often delicate preparations as ion-exchange rather than simple solid state reaction or hydrothermal synthesis. For the first time, polycrystalline AgCrO2 samples are synthesized by a one-step reaction between Ag2O and Cr(OH)3 in supercritical water conditions (400 °C, 40 MPa) using K2Cr2O7 as an oxidizing agent via a hydrothermal method. K2Cr2O7 is proved to be a good oxidizing agent, which avoids the formation of metallic silver and increases the solubility of precursors that lead to the formation of AgCrO2. The quality of the so-obtained compound is checked by structural as well as magnetic and optical properties characterizations.

Mots clés: Delafossite; Hydrothermal synthesis; FT-IR spectroscopy; Oxidizing agent; Oxides; Organic reactions; Silver; Chemical synthesis; Oxygen

Domaines: Matériaux

Sanjay Kumar, Christine Martin, Marinela Miclau. Hydrothermal Synthesis of AgCrO2 Delafossite in Supercritical Water: A New Single-Step Process. Chemistry of Materials, 2013, 25 (10), pp.2083-2088. ⟨10.1021/cm400420e⟩. ⟨hal-02264051⟩