Figure 11.

Three possible scenarios regarding the behavior of glassy LiCl_aq and the hypothesized effects on the glass transition temperatures based on literature and our results. (A) Both LiCl-LDA and LiCl-HDA are heterogeneous and phase separate into a water-rich part (LDA or HDA) and a CS. At low concentrations, this results in the appearance of the glass transitions of pure HDA T_g,2 or LDA T_g,1, along with the glass transition of the separated CS in the HDA (T_g,CS^in HDA) or LDA (T_g,CS^in LDA) matrix. At high concentrations (≥5.8 mol %, R = 16.2), only the glass transition of the CS T_g,CS is observed. (B) LiCl is only insoluble in LDA but not in HDA. Therefore, HDA is homogeneous and separates into LDA and a CS in the course of the polyamorphic transition. In contrast to the scenario described in panel (A), no T_g,CS^in HDA is observed. (C) LiCl-LDA and LiCl-HDA are fully homogeneous. Below 5.8 mol %, either T_g,2 (LiCl-HDA) or T_g,1 (LiCl-LDA) appears, whereas above 5.8 mol %, neither LiCl-HDA nor LiCL-LDA are observed but a homogeneous CS is formed instead. Only the T_g,CS value is found at ∼140 K, so that a jumplike change in T_g is found at ∼5 mol %.