A Calorimetric Study of the Liquid System Lead(II) Oxide-Germanium Dioxide at 900°C

The partial enthalpies of liquid lead(II) oxide and of tetragonal germanium dioxide in lead germanate melts were measured calorimetrically at 900°C in the range 0 to 65 mole-% GeO₂. The corresponding integral enthalpies of mixing were calculated. A relatively sharp dependence of the partial enthalpies on composition in the range from N = 0.3 to 0.45 probably is due to the formation of Ge₂O.