The intercalation, at room temperature, of the sodium-potassium eutectic into graphite is performaed ,in a glove box under purified argon. It leads ot a high alkali metal ocntent powder. The annealing under vacuum, at 200 deg C for two days leads to a pure first stage compound whose formula is NaK_2C_12 with a color and a structure close to that of KC_8. This phase is unstable and decomposes slowly in a mixture of KC_8 and free alloy. However, this free alloy, which is liquid at room temeprature, remains as inclusions between the graphene layers and the compound remains as a powder which can be useful for some applications when one needs large quantities of an alkali metal"solid" at room temperature, e.g. for gas purification, for rapid and intense heat provider, for ionic polymerization catalyst...
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