Autor: Werner F. Kuhs, Paolo G. Radaelli, B. Chazallon, F. Pauer
Rok vydání: 1997
Předmět:
Zdroj: Journal of Inclusion Phenomena and Molecular Recognition in Chemistry. 29:65-77
ISSN: 0923-0750
DOI: 10.1023/a:1007960217691
Popis: This paper reports pressuredependent high resolution neutron diffraction work onN2-clathrates, which for the first time providesnumbers on the compressibility as well as the locationand degree of filling of the guest molecules in thesmall and large cages. N2-clathrates crystallize,at least at lower pressures and temperatures near0 °C, in the Stackelberg type II structure.However, during the diffraction experiments we haveobserved the transient and partial formation of thevon Stackelberg type I N2-clathrate at pressuresexceeding several hundred bar. The filling of thesmall cages in the type II clathrate roughly followsa Langmuir isotherm. In contrast to most previousassumptions there is strong evidence that the largecages are doubly occupied in both type I and type IIN2-clathrates. The observed filling can be fittedreasonably well by a two-constant Langmuir model.
Databáze: OpenAIRE
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