Dynamics of the dipolar slowing-down process

Rather, a distribution of relaxation times is involved. It has become customary to assume a distribution function and fit it to the data. Alternatively, borrowing from the literature of dipolar and spin glasses, the distribution function G(t, T) can be calculated from the susceptibility using the equation 

In the absence of freezing, no anomaly in Tmax T) should be present at Tf. Relaxation data extending up to 9 decades on pmn and PbSco.5Tao.5O3 (pst) were found to yield excellent fits to Equation (15.8) and (15.9) using the same fitting parameters (t0, E and Tf) within errors. The coincidence of Tf obtained from the two fits was taken as strong evidence for freezing at 

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