Structural transition in mixed hydrates of xenon and krypton as a function of gas composition

• Published in: Journal of physical chemistry (1952) Vol. 94; no. 10; pp. 4363 - 4365
• Main Authors: Handa, Y. P, Ratcliffe, C. I, Ripmeester, J. A, Tse, J. S
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 01.05.1990
• Subjects: 400201 - Chemical & Physicochemical Properties; Atomic, molecular and charged-particle sources and detectors; DATA; DATA ANALYSIS; ELEMENTS; Exact sciences and technology; EXPERIMENTAL DATA; FLUIDS; GASES; HYDRATES; INFORMATION; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; KRYPTON; MEASURING INSTRUMENTS; MEASURING METHODS; NONMETALS; NUMERICAL DATA; Physics; RARE GASES; STRUCTURAL CHEMICAL ANALYSIS; XENON; Gas mixture; Phase composition; Concentration effect; Krypton Hydrates; Calorimetry; Xenon Hydrates; NMR spectrometry; Experimental study; X ray diffraction
• ISSN: 0022-3654; 1541-5740
• DOI: 10.1021/j100373a090

Six samples of mixed hydrates of structure I former Xe and structure II former Kr were prepared from gas mixtures in which the concentration of Xe varied from 1 to 24 mol %. The structures and compositions of the hydrates were studied by X-ray diffraction, NMR, and calorimetry. In all cases, there was significant enrichment of Xe in the hydrate phase. The structure of the mixed hydrate changed from structure II to structure I when the initial concentration of Xe in the gas mixture was 5 mol % or more. The results show that the structure of the mixed hydrate is primarily determined by the component having the larger Cf, where C is the Langmuir constant and f the partial fugacity.