The possible formation of a fcc Cs3C60phase which should have a high critical temperature is critically reviewed. Temptative synthesis of this derivative has been realized by playing on the kind of defects present in solid C60and also by reacting C60either with cesium vapor or with cesium dissolved in liquid ammonia. Whatever the experimental conditions, the fcc phase was never formed. Moreover, we could not observe the formation of bcc Cs3C60. Opposite to many statments, temperature does not modify drastically the nature of the phases formed, and even heat treatment up to 750°C leads, after cooling down, to a mixture of A15 and bct phases, whatever the method of preparation.