Fusion Curve and Polymorphic Transitions of Cesium at High Pressures

The fusion curve of cesium metal has been studied up to 50 000 atmospheres. The curve is unique among elements studied, in that it shows two maxima, one at approximately 22.5 kbar and 197^∘{}C, and a second at approximately 30 kbar and 198^∘{}C. Two triple points have been located. At 195^∘{}C, cesium has four different melting-freezing points and possibly another one at still higher pressures.