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Oxygen and gallium diffusiveness in langasite were experimentally determined by analysis of diffusion profiles of /sup 18/O and /sup 71/Ga tracers by SIMS analysis as functions of temperature and doping. Strontium-enhanced diffusiveness and activation energies of /spl sim/1.2/spl plusmn/ 0.2 eV confirm the predominant role of oxygen vacancies in controlling the electrical conductivity of langasite...
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