The thermal properties of helium confined in small geometries

The phenomenon of the shifts in the freezing and melting temperatures of various elements inside media with small pores is well established. What is not yet well understood are the attendant changes in the properties of the liquid and solid phases at these anomalously low temperatures. In our presen...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 1990-08, Vol.165, p.577-578
Main Authors: Brewer, D.F., Rajendra, J., Sharma, N., Thomson, A.L., Xin, Jin
Format: Article
Language:English
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Summary:The phenomenon of the shifts in the freezing and melting temperatures of various elements inside media with small pores is well established. What is not yet well understood are the attendant changes in the properties of the liquid and solid phases at these anomalously low temperatures. In our present work we produce various analyses of our experimental data to produce estimates for the way in which the confinement of pressurized helium inside the pores of Vycor glass has changed its properties from those of the bulk phase. Simultaneous measurements of pressure and heat capacity, coupled with quantitative measurements on the amount of helium sample inside our porous glass, allow a significant number of parameters to be examined. In particular the entropy difference between the liquid and solid phases is presented, as well as the volume difference between these phases. At least the former of these two properties appears to have values substantially less than that observed in the bulk phase.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(90)81138-E