Radiolysis of crystalline nickel oxalates

Radiolysis of crystalline K2Ni(C2O4)2·6H2O, K2Ni(C2O4)2 and Ni(C2O4)·2H2O has been investigated. The results showed that in K2Ni(C2O4)2·6H2O, the initial G(Ni3+) has a value of 3.75 and drops to about 1.27 when the dose approaches 1.2 x 1022eV g-1. The decrease in G(Ni3+) with increasing radiation dose is accompanied with an increase in G(Ni2+). In the irradiated anhydrated complex, the results however show an increase in G(Ni3+) and a decrease in G(Ni2+) with increasing radiation dose. The radiolysis of Ni(C2O4)·2H2O showed an increase in G(Ni3+) with increasing radiation dose. A mechanism has been suggested to explain the observed results. (author)