POLYMORPHISM AT HIGH PRESSURES. 



131 



It was hammered cold into an open steel shell, and pressure transmitted 

 directly to it by kerosene. 



There are two modifications; the transition is of the ice type, and 

 witliin the temperature range of this work the second phase exists only 

 at the higher pressures. The experimental values of pressure and 



Fig. 19. 



200 



ij 180" 



"S 160° 



0-140° 



h- 120° 



100 



.005 



.004 bo 



.003 2. 



.002 E 



001 > 

 <1 

 000 



10000 12000 

 Pressure, kgm./cm.^ 

 Cuprous Iodide 



FiK, 20. 



Figure 19. Possible mixed crystal diagram between Ammonium Acid 

 Sulfate and Potassium Acid Sulfate. 



Figure 20. Cuprous Iodide. The oljserved equilibrium pressures and 

 temperatures (circles) and the observed differences of volume (crosses). 



E 



^ A 



10000 12000 

 Pressure, kgm./cm.^ 

 Cuprous iodide 



Figure 21. Cuprous Iodide, 

 of internal energy. 



The calculated latent heat and the changes 



temperature and change of volume are shown in Figure 20, the com- 

 puted values of latent heat and change of internal energy in Figure 21, 

 and the collected numerical results in Table X. The diagram seems 

 normal in every way. This is one of the few examples found in this 



