VAPORIZATION BEHAVIOR OF (NP,PU)N

Knudsen effusion mass spectrometric analysis of neptunium-plutonium mi xed nitride, (Np,Pu)N, was carried out in the temperature range of 127 0-2010 K. The pressures of Np(g) over the solid solutions showed a sim ilar temperature dependence with that of Np(g) over Np(1). On the othe r hand, there were two stages for the temperature dependence of Pu(g) over the solid solutions. The pressures of Pu(g) at higher temperature s showed a similar temperature dependence with the case of congruent v aporization of PuN and depended on the Pu/(Np+Pu) ratio in the solid p hase. The pressures of Pu(g) at lower temperatures showed a similar te mperature dependence with that over Pu(l). (C) 1998 Elsevier Science S .A.