The thermal decomposition of irradiated potassium permanganate

The Effect of y-Irradiation on the Oxydation State of Manganese in Potassium Permanganate

“…Gamma irradiated samples exhibit upon heating a similar trend, indicated by an initial increase in the retention, which is however at prolonged annealing overcompensated by the effects of a thermal decomposition process resulting in the formation of manganese in lower oxidation states (Table 3). This observation seems to be quite consistent with a model suggested by PROUT [2] and others, which postu-lates that thermal treatment favors the return of radiation produced interstitial atoms to a vacancy whereby substantial amounts of energy are released 10 eV). This release of stored energy provides enough energy for rupturing the bonds in the permanganate ions, adjacent to the site where interstitialvacancy recombination took place, thus forming a "center of decomposition".…”

“…Die bei 20,0, 22,5 und 25,0 °C gemessenen Werte sind wegen der Überlappung ihrer Fehlerbalken etwas versetzt eingetragen. Bei der kritischen Temperatur liegen 2 Phasen gleicher Zusammensetzung vor, dort ist also ε 0 = 0The radiolysis caused by various types of radiation in the solid potassium permanganate system has been studied by several investigators [2][3][4][5][6]. Most of these studies analyzed the radiation induced effects by subsequent thermal decomposition of the irradiated potassium permanganate whereby a distinct correlation between the absorbed radiation energy and the rate of decomposition was observed.…”

Evaluation of kinetic parameters for the thermal decomposition of gamma-irradiated anhydrous lanthanum nitrate

“…In systems containing molecular ions, irradiation produces chemical damage, displacements, and extended lattice defects [26,32]. The influence of irradiation on solid decomposition has been ascribed to these effects that produce, as well as facilitate formation and growth of nucleation centres [33]. The lattice defects do not have any significant role in the decomposition of substances that decompose after melting as they are removed when the crystals melt [7].…”

Effect of Doping and Irradiation on the Decomposition of NaBrO3: A Kinetic Study

“…The damaged species present in irradiated sodium bromate under the present experimental conditions, i.e., at room temperature and moderate doses of irradiation are Br -, BrO", Br0 2 ", Br0 4 ", 0 3~ and 0 2 in addition to trapped electrons, holes, interstitial atoms, radicals, etc. [37], These damaged species constitute decomposition nuclei themselves and may be termed as irradiation nuclei 'n,' [16] which play an important role both in nucleation and nuclei growth during the decomposition process [38]. The crystals of sodium bromate supposed to have 'n 0 ' number of nuclei in the lattice prior to irradiation and later on generates some additional nuclei which grow in size and number on subsequent heating.…”