Вышедшие номера
Peculiarities of gallium crystallization in confined geometry
Borisov B.F.1, Charnaya E.V.1,2, Gartvik A.V.1, Tien Cheng2, Kumzerov Yu.A.3, Lavrentev V.K.4
1Institute of Physics, St. Petersburg State University, Petrodvorets, St. Petersburg, Russia
2Department of Physics, National Cheng Kung University, Tainan Taiwan
3A.F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia
4Institute of High-Molecular Combinations, St. Petersburg, Russia
Email: charnaya@mail.ru
Поступила в редакцию: 16 марта 2004 г.
Выставление онлайн: 19 ноября 2004 г.

The freezing and melting phase transitions for gallium embedded into a porous glass with pore size of about 8 nm were studied using acoustic, NMR, and x-ray techniques. It was shown that the broadened solidification and melting transitions upon deep cooling until complete freezing at 165 K were due to formation of beta-Ga within pores. The offset of confined beta-Ga melting was lowered by about 21 K compared to the bulk beta-Ga melting point. Both melting and freezing in pores were irreversible. The fulfillment of some special thermal conditions led to gallium crystallization into other modifications. The role of heterogeneous crystallization in freezing of confined gallium is discussed. The present work was partially supported by the National Science Council of Taiwan under Grant 91-2112-M-006-017.
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