VELOCITY OF POLYMORPHIC CHANGES BETWEEN, SOLIDS. 



69 



Ammonium Nitrate.^ — It was possible to make measurements 

 on several of the transition curves. The Hmiting accelerations are 

 shown in Figure 14 and the width of the bands in Figure 15. A single 



50° 100° 

 Temperature 

 Silver Nitrate 



150° 



Figure 13. Silver Nitrate. The breadth of the band of indifference as a 

 function of temperature along the transition line. 



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 Pressure, kgm./cm.^ x 10^ 

 Ammonium Nitrate 



Figure 14. Ammonium Nitrate. The pressure acceleration of the velocity 

 of transition at zero velocity as a function of pressure or temperature along 

 the transition lines of the several modifications. Observe the change of 

 abscissa for II-VI. 



observation on the II-III curve at 67° gave a band vndth of 115 

 kgm. and limiting accelerations of 0.0013 and 0.00026 with falling 

 and rising pressure respectively. The reversal of the acceleration,. 



9 G, p. 605. 



