Mixtures of refrigerants have been used to produce mixed-gas hydrates or clathrates at different pressures and temperatures. A clathrate at atmospheric pressure and at a temperature of 9.2/sup 0/C (48.6/sup 0/F) was obtained by using a mixture of Refrigerant-12 (R-12) and Refrigerant-11 (R-11). In addition, mixtures of R-12 and Refrigerant-114 (R-114) and of R-11 and R-114 have been tested. For these cases R-114 did not enter into the clathrate. Mixed hydrates or clathrates open new possibilities as the storage media for either cool or heat storage systems.