On the pressure evolution of the melting temperature and the glass transition temperature

New Challenges for the Pressure Evolution of the Glass Temperature

“…In subsequent decades Eq. 9, most often recalled as the "Kechin equation, " became the key tool for describing experimental data associated with melting curve maximum (Drozd-Rzoska, 2005;Skripov and Faizulin, 2006;Drozd-Rzoska et al, 2007a;Rzoska and Mazur, 2007;Rzoska et al, 2010). Regarding the meaning of parameters in Eqs 6-9 one can generalize the reasoning of Burakovsky et al (Burakowsky et al, 2000;Burakovsky et al, 2003), who considered the volume-related compression factor (modulus):…”

“…Such reference cannot be implemented for the glass transition. Drozd-Rzoska (Drozd- Rzoska, 2005;Drozd-Rzoska et al, 2007a, 2008 proposed as the reference arbitrary values (T 0 , P 0 ) along melting or vitrification curves, assuming ΔP = P − P 0 . Subsequently, considering the Clausius-Clapeyron equation along the melting or vitrification curve (ΔH/ΔV) T g,m ,P g,m = (bΠ + bΔP)/(1 − c (bΠ + bΔP)) the following relation was derived (Drozd- Rzoska, 2005):…”

“…For small or moderate pressures one obtains the SG or AA-type equation (Drozd-Rzoska, 2005;Drozd-Rzoska et al, 2007a, 2008:…”

“…To address these questions, in Drozd- Rzoska (2005), Drozd- , and Drozd- Rzoska et al (2007a), the preliminary derivative-based and distortions-sensitive analysis of T m (P) and T g (P) experimental data was proposed: …”

“…They are, for instance: (i) the notable increase of density, (ii) the increase of hardness, and (iii) the anty-cracking ability (Smedskjaer et al, 2014;Januchta et al, 2016Januchta et al, , 2017Svenson et al, 2017). Still puzzling is the description of T g (P) behavior in systems where dT g /dP < 0 (Donth, 2000;Drozd-Rzoska et al, 2007a,b, 2008.…”