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

Abstract : 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.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02264051
Contributor : Elisabeth van T Hof <>
Submitted on : Tuesday, August 6, 2019 - 11:03:34 AM
Last modification on : Tuesday, May 26, 2020 - 6:40:05 AM

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Sanjay Kumar, Christine Martin, Marinela Miclau. Hydrothermal Synthesis of AgCrO2 Delafossite in Supercritical Water: A New Single-Step Process. Chemistry of Materials, American Chemical Society, 2013, ⟨10.1021/cm400420e⟩. ⟨hal-02264051⟩

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