Regensburg 2016 – wissenschaftliches Programm
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MI: Fachverband Mikrosonden
MI 8: Crystallography in Materials Science (KR, DF, MI)
MI 8.1: Vortrag
Donnerstag, 10. März 2016, 15:40–16:00, H26
Low temperature synthesis of CuFeO2 (delafossite) between 50∘C and 90∘C: A new process solely by precipitation and ageing — •Melanie John1, Aladin Ullrich2, and Soraya Heuss-Aßbichler1 — 1Ludwig-Maximilians-Universität München, München, Deutschland — 2Universität Augsburg, Augsburg, Deutschland
Due to the large variability of technical applications of delafossite compounds e.g. as a catalyst, in p-type conduction oxides or as a cathode in Li-ion batteries, the synthesis of ABO2 structures have received much attention the last years. Delafossite syntheses have been reported via solid state reaction and sol-gel processes using high temperatures between 900-1200∘C or hydrothermal synthesis methods using at least autogenous pressure so far. We now synthesized CuFeO2 nanoparticles, the parent mineral of the Delafossite group, solely by precipitation and subsequent ageing at temperatures between 50∘C and 90∘C and without any additives controlling the oxidation state of copper for the first time. With this method, it is possible to synthesize a mixture of 2H (space group (SG): P63/mmc) and 3R polytype (SG: R-3m) of delafossite showing hexagonal morphology within 10 hours. The experimental conditions regulate the phase assemblage, size and the necessary ageing time. The synthesized material was analyzed by ICP-OES, FTIR, XRD, SEM, TEM and magnetic measurements.