Abstract
A large class of liquids obey density scaling characterized by an exponent, which quantifies the relative roles of temperature and density for the dynamics. We present experimental evidence that the density-scaling exponent γ is state-point dependent for the glass formers tetramethyl-tetraphenyl-trisiloxane (DC704) and 5-polyphenyl ether (5PPE). A method is proposed that from dynamic and thermodynamic properties at equilibrium estimates the value of γ. The method applies at any state point of the pressure-temperature plane, both in the supercooled and the normal liquid regimes. We find that γ is generally state-point dependent, which is confirmed by reanalyzing data for 20 metallic liquids and two model liquids.
Highlights
Decreasing the temperature (T) or increasing the density (ρ) by applying pressure to a liquid leads to a slowing down of the molecular dynamics and eventually to a glass transition if crystallization is avoided [1,2]
A large class of liquids obey density scaling characterized by an exponent, which quantifies the relative roles of temperature and density for the dynamics
In this Letter we show, that γ for other systems is not constant but state-point dependent; this is done by using a novel formalism that allows γ to be determined from properties exclusively referring to the state point in question
Summary
Decreasing the temperature (T) or increasing the density (ρ) by applying pressure to a liquid leads to a slowing down of the molecular dynamics and eventually to a glass transition if crystallization is avoided [1,2]. Experimental Evidence for a State-Point-Dependent Density-Scaling Exponent of Liquid Dynamics
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
