Cooling history of anhydrous glasses based on heat capacity measurements

2 Cooling history of anhydrous glasses based on heat capacity measurements 

Itq to obtain the Cp versus temperature curve and the maximum Cp value. Repeat this procedure for many different cooling rates (such asq = 0.0001 to 100 K/s). After the maximum Cp value as a function of prior cooling rate is quantified as the calibration curve, measurement of the Cp versus temperature curve upon heating of any natural glass sample with the same composition as the calibration may be used to obtain the cooling rate of the natural glass. 

3 Geospeedometry based on diffusion and zonatlon In a single phase 

For a given cooling history, the diffusivity depends on time, and the mean diffusion distance may be estimated by (JD df). Thus, if we know the dependence 

Knowing that the profile is due to diffusion, and if the diffusion distance is small compared to the size of the crystal, we can view the diffusion as a onedimensional diffusion-couple problem. The solution for the diffusion-couple problem is (Equation 3-38) 

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