General, Organic, and Biological Chemistry
Cache-type phase-change random-access memory PCRAM is a remaining challenge on the path to universal memory. The recently designed Sc0. This contrast in kinetics behavior, upon a relatively small temperature excursion, is more dramatic than that in other PCMs. From the temperature dependence of the crystallization kinetics uncovered via ultrafast differential scanning calorimetry, here we report an apparent fragile-to-strong crossover in the SST supercooled liquid. We illustrate that two factors are at work simultaneously. First, Sc-stabilized precursors serve as heterogeneous sites to catalyze nucleation, reducing the stochasticity and thereby accelerating the nucleation rate. Second, the SST exhibits an enlarged kinetic contrast between elevated and ambient temperatures.