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Evolution of layers and motional states of helium adatoms in the micro-pores of Y zeolites

✍ Scribed by Nobuo Wada; Hideyuki Kato

Book ID
103940560
Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
170 KB
Volume
194-196
Category
Article
ISSN
0921-4526

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✦ Synopsis

Properties of helium adatoms in the 8-13/~ diameter pores of Na-Y and Silica-Y zeolites with different Si/A1 ratios and cations have been studied by measuring an isosteric heat qst of adsorption and heat capacity C. Step-wise changes Of qs t at T--0K with increasing the amount n adsorbed give magnitudes of the localization potentials on the pore wall and they show evolution of layers. In the Y zeolites, a first layer is completed at n-38% of the full pore amount. The adatoms on the first layer are gas-like since we observed aC/an-R/2 (=4.2J/K/mol) at 38<n,<,45% and 1,<,T,<,5 K. At 50,<,n,,:65%, they are a liquid-like state with a T-linear heat capacity. Fermi degeneracy of the gasor liquid-like 3He adatoms is possible below a few hundreds mK.

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