ABSTRACT
The value of k\ preserves the same temperature dependence in both crystalline modifications, and k2, at the point o f phase transition, decreases sharply and, at temperatures above the temperature of the phase transition, has a weaker temperature dependence:
kx = 10 8 0 exp(-30000 /#r), s"1 (195-280 C) , yt2 = 10 1 0 2 exp( -30000 / #r ) , s"' (195-240 C) , k2 = 10 4 5 exp(-18100 / /?r), s - 1 (240-280 C) .
