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Self-diffmion of Bi in Bi203 has been reported. The results suggest that the phase transformation has a marked effect on the diffusion rates. From the log D against 1/T plots it has been possible to determine the temperature of phase transformation. Addition of V205 and CdO altered appreciably the diffusion rates without affecting the activation energies. It is proposed that in CdO, cadmium occupies a vacant lattice site.8 to whom all corn-India.

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