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.

摘要

以氯化铜、氯化铁和二氧化硒为原料，采用水热法制备CuFeSe ₂粉体材料。研究了不同热处理温度和时间对CuFeSe ₂相形成的影响。实验结果表明，CuFeSe ₂晶体在180℃下分别进行2 h和40 h的热处理时开始形成，当温度达到200℃时，CuFeSe的X射线衍射（XRD）峰开始形成。₂变高，说明CuFeSe ₂晶体的结晶度更好。目标产物CuFeSe ₂CuFeSe ₂晶体在 180 °C 下分别经过 30 小时和 40 小时可以发现晶体，时间越长，则 XRD 峰越强。CuFeSe ₂晶体在200°C下热处理时间为5小时至40小时时形成。在200℃反应时间为5h和20h时，产物CuFeSe ₂粉末尺寸小于100nm，由大的多角形晶体和较小的椭圆形晶粒组成；反应时间为20h时，160℃下为30h，产物CuFeSe ₂粉末由不均匀的晶粒组成，晶粒间有团聚现象。