Abstract
Ionic diffusion in the quartz–β-eucryptite system is studied by DC transport measurements, SIMS and atomisticsimulations. Transport data show a large transient increase in ionic current at theα–β phasetransition of quartz (the Hedvall effect). The SIMS data indicate two diffusion processes, one involvingrapid Li+ motion and the other involving penetration of Al and Li atoms intoquartz at the phase transition. Atomistic simulations explain why the finemicrostructure of twin domain walls in quartz near the transition does not hinderLi+ diffusion.
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