The Preparation of Cu - doped Ca3Co4O9 Thermoelectric Materials

In this paper, CaCO3, CoO, CuO as raw materials, using solid phase preparation of Ca3Co4O9-based thermoelectric materials doping Cu. The Ca3Co4O9-based thermoelectric material intermediates were prepared according to the stoichiometric ratio x=0.01, and the sintered crystals were prepared by using muffle furnace under different temperature setting conditions. X-ray diffraction (XRD) and Scanning electron microscopy (SEM) were used to analyze the crystallinity and morphology of the samples after sintering. The results show that the crystallinity of Ca3Co4O9-based thermoelectric materials is best when sintered at 800-850 degrees C, and the crystallinity of samples sintered at 850 degrees C is better than that at 800 degrees C, The diffraction intensity ratio is stronger than 800 degrees C Continue to raise the temperature, Ca3Co4O9-based thermoelectric materials phase transition to Ca3Co2O6-based thermoelectric materials, When the sintering temperature is 1000 degrees C, the product is Cu-doped Ca3Co2O6-based thermoelectric materials.