Abstract
Grain-boundary migration rates in LiF were determined by monitoring discontinuous recrystallization rates in deformed single crystals at temperatures between 0.7 Tm and 0.98 Tm, the melting temperature. Significant reductions in migration rates, relative to those expected for pure material, result from solute additions of Mg, Al, or Na, as well as from background impurities. The magnitude of the solute drag effect differs greatly; solute drag coefficients for the dopants studied ranked as αAi/(7 × 104) ≧αMg≧5αNa. Most work was done with Mg-doped crystals; the behavior under some conditions was consistent with that expected for stable solute-drag-limited boundary migration. In contrast, under some conditions of driving force, temperature, and composition, significant variability in mobilities was found both from several measurements for the same experimental conditions and from variability in the amount of displacement along individual growth fronts. This variability is attributed to transitions between different stable mobility extremes.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
