TRACER-DIFFUSION OF MANGANESE IN ALPHA-MNS POLYCRYSTALS

Self-diffusion of Mn in powder compacts of alpha-MnS has been studied with the use of the radioactive tracer Mn-54. The experiments were car ried out between 1073 K and 1323 K and in the sulfur vapour pressure i nterval (10 divided-by 4 .10(3)) Pa by means of the tracer-sectioning method. It was confirmed that under the conditions used in this experi ment the dominant point defects are doubly charged vacancies and elect ron holes. The activation energy of the diffusion equals (142 +/- 10) kJ/mol.