scholarly journals Preparation and Magnetic Susceptibility of an Oxygen Clathrate Compound

Nature ◽  
1952 ◽  
Vol 170 (4319) ◽  
pp. 246-246 ◽  
Author(s):  
D. F. EVANS ◽  
R. E. RICHARDS

It is shown that previous measurements on the magnetic susceptibility of oxygen in a clathrate compound can be explained if it is assumed that the molecule, instead of being completely free as previously assumed, is subject to a potential V 0 (1 —cos 2 θ ) with V 0 / k = 32° K. θ is the angle between the figure axis of the molecule and the c axis of the crystal. The susceptibility measurements were extended down to 0⋅25° K and showed good agreement with the theory.


The magnetic susceptibility of oxygen enclosed in a β-quinol clathrate compound has been measured at temperatures from 1 to 20° K. Its behaviour is compared with that calculated for a gas of non-interacting oxygen molecules over the same range of temperature. At high temperatures such a gas would obey Curie’s law, but owing to the restriction to odd values of rotational quantum number, the susceptibility of a gas of 16 O 16 O molecules would depart from Curie’s law at temperatures below 10° K. It is found that at temperatures above 2°K the susceptibility of the oxygen in the clathrate compound agrees within the experimental error with the calculated susceptibility. Below 2°K, however, they do not agree, nor is any difference observed between oxygen of normal isotopic constitution and oxygen enriched to 11 % in 16 O 18 O, whereas the magnetic susceptibility calculated for an enriched specimen of the free gas would differ appreciably from that of the normal gas at temperatures below 2°K.


1983 ◽  
Vol 44 (C3) ◽  
pp. C3-893-C3-901 ◽  
Author(s):  
M. Miljak ◽  
J. R. Cooper ◽  
K. Bechgaard

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