Heat capacity, adsorption isotherms, and quasielastic neutron scattering measurements of bilayer deuterium hydride adsorbed on graphite

被引：9

作者：

Liu, YM

Ebey, PS

Vilches, OE

Dash, JG

Bienfait, M

Gay, JM

Coddens, G

机构：

[1] UNIV WASHINGTON, DEPT PHYS, SEATTLE, WA 98195 USA

[2] CNRS, CRMC2, F-13288 MARSEILLE 9, FRANCE

[3] CENS, LAB LEON BRILLOUIN, F-91191 GIF SUR YVETTE, FRANCE

来源：

PHYSICAL REVIEW B | 1996年 / 54卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.54.6307

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Bilayer films of deuterium hydride (HD) adsorbed on exfoliated graphites have been studied using heat capacity, adsorption isotherms, and quasielastic neutron scattering (QENS) measurements. The second layer of HD shows solid (S), liquid (L), and gaseous (G) [vapor (V)] phases, with two-dimensional (2D) characteristics. We determined the S-L-V triple line at T-t(2D)=8.44 K, and the L-V critical temperature at T-c(2D)=11.45 K. QENS identified the L phase and measured its translation diffusion coefficient D-T(approximate to 10(-5) cm(2) s(-1) at 9.25 K). Isosteric heats, latent heat, and entropy change at melting, and solid Debye temperatures are calculated. The results are used to construct a general graph of critical and triple points of adsorbed gases as a function of their quantum parameter.

引用

页码：6307 / 6314

页数：8

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