PbO (litharge) was doped with Ba2+ and Sr2+ up to 10 mol%. The doped samples were heterogeneous, containing Pb4+ and/or C032-. The tempearture of transformation, Ttr, into massicot increased on doping, whereas it decreased after mechanical treatment. Changes in Ttr are discussed in terms of the mobility of oxygen atoms. The apparent enthalpy of the phase transformation, ΔHtr was negatively correlated with the lattice distortion consequent on doping and grinding. The feasibility of controlling transformation kinetics by the concurrent effects of doping and lattice distortion is also discussed.
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