Hexagonal polytype of CuCrO2 nanocrystals obtained by hydrothermal method
We had first synthesized hexagonal 2H-CuCrO2 nanocrystals by hydrothermal method. The stability diagram for Cu–Cr–Na–H2O system allows preparing of nanocrystalline CuCrO2, either 2H or 3R pure phase, by a single step, low-temperature hydrothermal synthesis. 2H- and 3R-CuCrO2 quasi-hexagonal shape nanocrystals have shown a wide range of size distribution varying from about 20 to 40 nm. An unexpected result is that 2H-CuCrO2 phase was a low temperature phase in the hydrothermal synthesis. Also, a formation mechanism for the synthesis of CuCrO2 nanocrystal, 2H- and 3R-polytypes was proposed.
KeywordsNanocrystal 2H-polytype Delafossite Hydrothermal Thermoelectric
This study was supported by the strategic grant POSDRU ID77265 (2010), co-financed by the European Social Fund-Investing in People, within the Sectorial Operational Programme Human Resources Development 2007–2013 and Initial Training Network SOPRANO 214040, supported by the EU Seventh Framework Programme.
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