Thermodynamic Properties of the Cesium—Graphite Lamellar Compounds

The vapor pressures of the cesium—graphite lamellar compounds in the two‐phase regions were measured at temperatures of 400° to 750°C. The Knudsen effusion method, in conjunction with a tracer technique employing cesium‐134, was used. Thermodynamic properties were calculated from the data and are discussed in relation to the structures of the cesium—graphite lamellar compounds.