Abstract
Nucleation frequencies and growth rates of crystals in a 51ZrF 4–18.5BaF 2–4LaF 3–4.5AlF 3–20NaF–2YF 3 (ZBLYAN) glass. Crystal morphologies were measured at surfaces and in the bulk of the samples differ. The size of crystals on the surface increased linearly as a function of annealing time, while that of bulk crystals increased with the square root of time. The growth rate of surface crystals ranges from 10 −8 to 10 −7 m s −1 in the temperature range between 603 and 643 K. The homogeneous nucleation frequency has been calculated as a function of temperature. A comparison is made between computed and experimental nucleation frequencies for bulk crystals. Calculated values are several orders of magnitude less than those measured. Therefore, the experimental data suggest a heterogeneous nucleation mechanism, possibly on homogeneously distributed impurities.
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