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Relation between excess volume, excess free energy and isothermal compressibility in liquid alloys

Brillo, Jürgen and Watanabe, Manabu and Fukuyama, Hiroyuki (2021) Relation between excess volume, excess free energy and isothermal compressibility in liquid alloys. Journal of Molecular Liquids, 326, pp. 114395-1. Elsevier. doi: 10.1016/j.molliq.2020.114395. ISSN 0167-7322.

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Excess volume data of 32 liquid alloys were reviewed and plotted versus their excess free energies. It is hereby found that all combinations of the signs of EV and EG are possible. The excess volume data split into two different curves which are monotonous in EG. For one of these curves the signs of EV and EG are equal and they are opposite for the other. We improved our previously developed model and found that there is an unspecified sign which can be chosen either + or -, depending on the system. This explains why there are two curves corresponding to the experimental finding. The model relates excess volume, excess free energy and isothermal compressibility with each other whereby the concept of excess internal pressure is used. The model can also predict the excess volume as function of the excess free energy, when the correct sign, either + or -, is known and a reasonable assumption is made for the effective isothermal compressibility. In the present work, the latter has been estimated as an average from the isothermal compressibility values over the involved pure elements. Good qualitative and quantitative agreement with the experimental data is obtained for the systems investigated. The model is valid at least for -3RT < EG < +1RT.

Item URL in elib:https://elib.dlr.de/141054/
Document Type:Article
Title:Relation between excess volume, excess free energy and isothermal compressibility in liquid alloys
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Watanabe, ManabuTokyo Institute of Technology (TITECH), YokohamaUNSPECIFIEDUNSPECIFIED
Fukuyama, HiroyukiTohoku University, SendaiUNSPECIFIEDUNSPECIFIED
Date:February 2021
Journal or Publication Title:Journal of Molecular Liquids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 114395-1
Keywords:excess free energy, excess volume, internal pressure, isothermal compressibility, liquid metallic alloys
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Materials Research and Microgravity (MuM)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Brillo, Dr.rer.nat. Jürgen
Deposited On:22 Feb 2021 08:48
Last Modified:24 May 2022 23:46

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