A quantitative figure of merit for assessing the potential of various elements for activation sintering has been derived by combining the relevant heats of solution, surface energies, and the energy of formation for vacancies in the activator. Good agreement has been obtained between calculated values and the accepted qualitative ranking for activators used to accelerate the sintering of tungsten and molybdenum. The formalism should be capable of extension to multicomponent systems. PM/0351
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