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- Title
Crystallization of <sup>4</sup>He in Aerogels.
- Authors
Aiko Osawa; Haruko Kato; Tomohiro Mimori; Ryuji Nomura; Yuichi Okuda
- Abstract
Abstract  Static behaviors of crystallization of 4He in porous materials, such as the increase of melting pressure, have been studied extensively, but nonequilibrium dynamics of the phase transition is hardly known. Our interest was in how 4He crystals grow in a 90.4% porosity aerogel. Aerogels are transparent and the dynamics in them can be studied visually. A Pomeranchuk-type variable-volume cell was used to study crystallization at a fixed temperature with a blocked capillary condition. By continuously compressing a chamber, the pressure rose above the bulk melting pressure and at a pressure 1.7 bar above the bulk melting pressure these crystals began to invade the aerogel. A clear crystal-superfluid interface was moved smoothly by the steady compression. No macroscopic facets were observed in the aerogel well below the bulk roughening transition temperature.
- Subjects
STATICS; CRYSTALLIZATION; HELIUM; AEROGELS
- Publication
Journal of Low Temperature Physics, 2008, Vol 150, Issue 3/4, p499
- ISSN
0022-2291
- Publication type
Article
- DOI
10.1007/s10909-007-9570-z