Abstract
The X-ray structures of liquid sodium, potassium and sodium-potassium alloys have been investigated by an improved method. By using a reservoir technique a plane horizontal surface of liquid metal has been examined by a monochromatic X-ray beam in a focusing Geiger diffractometer. Thus the absorption correction, which is one of the greatest sources of error in previous work, is constant and omitted from the analysis. The radial distribution method of analysis has been used to interpret the results. None of the liquids examined shows evidence of structure other than that associated with a statistical mixture of atoms. In particular the position of the intensity peak is found to depend in a fairly simple way on alloy composition and does not show the marked deviation at compound composition Na 2K as reported by other workers. The use of the radial distribution method has been examined critically. It is felt that the method is adequate for interpreting simple liquid structures provided suitable modification functions are used to expose spurious detail.
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