Abstract
Theory predicts a fragile-to-strong (FS) dynamic crossover temperature Tx in supercooled liquids but, contrary to what is reported in ref. 1, Tx must be >Tg (2), where Tg is the glass transition temperature. Ref. 4 of ref. 1 hypothesizes that a parabolic form is valid in a range To > T > Tx, where To is defined as an onset temperature that marks the crossover from normal liquid behavior to supercooled liquid behavior. A second paper by the same authors (ref. 5 of ref. 1) proposes the range of the hypothesized parabolic behavior can be extended to cover T To, changes of three to four orders of magnitude take place in transport parameter values. Moreover, glass transition theories such as mode coupling theory (2) consider these data to be extremely relevant.
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