Hot atom chemistry in oxyanion targets: Part V―Pre-activation heat treatment study of recoil 56Mn in permanganates

Abstract

The effect of pre-heat treatment on the fate of ⁵⁶Mn recoil atoms originating from (n, γ) reaction in KMnO₄, Ba(MnO₄)₂ and NH₄MnO₄ targets results in a slight increase in the initial ⁵⁶Mn retention and decrease in the extent of subsequent thermal annealing. Fletcher-Brown model has been utilized to deduce the kinetic behaviour of the annealing phenomenon which consists of two apparent first order processes for both the pre-heated and untreated permanganates. The implications of the results are explained on the basis of competitive participation of oxidising/reducing inherent crystal defects.