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In situ variable temperature X-ray diffraction studies on size scale of CuCrO2 polytypes with delafossite structure

D. URSU1,2, M. MICLĂU2, I. GROZESCU1,2,*

Affiliation

  1. Politehnica University of Timisoara, Romania
  2. National Institute for Research and Development in Electrochemistry and Condensed Matter Timisoara, Romania

Abstract

We had first studied the thermal stability of 2H and 3R polytypes of CuCrO2 nanocrystals obtained by hydrothermal method from room temperature up to 1100 °C under vacuum conditions. The variable temperature X-ray patterns had shown that the thermal stability depends by the polytypes of CuCrO2 nanocrystal, 2H-CuCrO2 has been more stable phase than 3RCuCrO2. Also, our work had revealed the effect of the synthesis method on the thermal stability of 3R-CuCrO2 microcrystals obtained by hydrothermal method and conventionally solid state method. An interesting result is that synthesis method has no effect on the thermal stability of 3R-CuCrO2 delafossite phase, the decomposition temperature has been found about 1000°C. High temperature X-ray patterns of 3R-nano and micro crystals had shown the size dependence thermal stability, the 3R-CuCrO2 micro crystal had kept the delafossite structure up to 1000°C compared with 500°C for 3R-CuCrO2 nanocrystal..

Keywords

Hydrothermal method, In situ High temperature X-ray diffraction, CuCrO2.

Submitted at: March 25, 2013
Accepted at: July 11, 2013

Citation

D. URSU, M. MICLĂU, I. GROZESCU, In situ variable temperature X-ray diffraction studies on size scale of CuCrO2 polytypes with delafossite structure, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 7-8, pp. 768-773 (2013)