The stability of CaCl
2-and FeCl
3-graphite intercalation compounds (GICs) was examined. CuCl
2-and FeCl
3-GICs were prepared from Grafoil strips by the“two-bulb” or “mixed” methods. The composition and the stage structure of the resultant GICs were determined by the weight-increase and X-ray diffraction measurements.
The stability of the GICs was examined by the two methods. Firstly, the GICs prepared were kept in the air at room temperature, and their degradation with time was followed up to 35 days by X-ray diffraction and electrical resistivity measurements. It was found that CuCl
2-GICs were rather stable and only a small change was found in both the resistivity and X-ray diffraction pattern, while a considerable degradation was observed on FeC13-GICs in a few days. The tests for the thermal stability of the GICs also showed the similar tendency. Thedegradation temperatures in the air and in the nitrogen atmosphere were determined as 310°C and 330°C for CuCl
2-GIC (1st stage), and about 300°C in both cases for FeCl
3-GIC (1st stage), respectively.
View full abstract