Phase and Morphology Analysis in Synthesis of CuFeSe₂ Powder

Abstract

CuFeSe₂ powder materials were prepared by hydrothermal method using raw materials of copper chloride, ferric chloride and selenium dioxide. The effects of different heat treatment temperature and time on the phase formation of CuFeSe₂ were investigated. The experimental results show that, CuFeSe₂ crystals start to form when the heat treatment is performed at 180 °C for 2 h and 40 h respectively, and when the temperature reaches 200 °C, the X-ray diffraction (XRD) peak of CuFeSe₂ becomes higher, which indicates that the crystallinity of CuFeSe₂ crystal is better. The target product CuFeSe₂ crystals can be found at 180 °C for 30 h and 40 h respectively, and the longer the time, the stronger the XRD peak for CuFeSe₂ crystal. CuFeSe₂ crystals are formed when the heat treatment time is 5 h to 40 h at 200 °C. When the reaction time is 5 h and 20 h at 200 °C, the product CuFeSe₂ powder is less than 100 nm in size and consists of large polygonal crystals and smaller oval grains; When the reaction time is 20 h, 30 h at 160 °C, the product CuFeSe₂ powder composed of uneven grains and there is agglomeration among the grains.

Keywords:

• Hydrothermal method
• CuFeSe2
• optoelectronic materials
• tetragonal phase
• morphology

Additional information

Funding

This work was financially supported by the National Natural Science Foundation of China (No.51272140) and the Innovation Team of the Co-Innovation Center for Green Building of Shandong Province in Shandong Jianzhu University.