Diffusion of mercury in HgSn8 (gamma2 phase).
The tracer diffusion coefficients of mercury in a Sn-Hg alloy (Sn 82.6 and Hg 17.4 wt.%; HgSn8 (gamma2 phase)2.6 and Hg 17.4 wt.%; HgSn8 [gamma2 phase]) were measured by the residual activity method at temperatures ranging from 35.5 to 95 degrees C. The Arrhenius equation for the mercury tracer was found to be Dv=2.10 X 10(-3) exp (-8.96 X 10(3)/RT) cm2/sec. The diffusivity of mercury in the three phases, the gamma (Ag3Sn), gamma1 (Ag2Hg3) and gamma2 (HgSn8) phase, that coexist in silver-tin dental amalgam have now been determined. Mercury diffuses fastest in gamma2 phase and slowest in gamma phase.
D003723:Dental Amalgam / Q000032:analysis*; D004058:Diffusion; D006801:Humans; D008628:Mercury / Q000032:analysis*; D014001:Tin / Q000032:analysis*
D014001:Tin; D003723:Dental Amalgam; D008628:Mercury