energy change for the reaction PuCl3(s) + 12Cl2(g) = PuCl4(g) in the temperature range 400–750° was determined from transport in chlorine carrier gas. The molar free energy of reaction may be represented by the relation ΔF = 37700 − 28·3 T(cal.), where T denotes degrees Kelvin. The standard free energy, enthalpy and entropy of formation of PuCl4 are estimated.
Phaseequilibria in the systemPuCl3PuOCl were studied over the temperature range 100–1300°C and composition range 0–35 mole% PuOCl by thermal analysis and differential thermal analysis techniques, supplemented by X-ray powder diffraction analysis. A single eutectic was found at 747° and 8 mole % PuOCl. No evidence of compound or solid solution formation was observed.