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A simple high pressure x-ray powder camera is described. The pressure vessel is a disk of three parts ``amorphous'' boron and one part epoxy resin which is pressed between tungsten carbide anvils. The sample can be oscillated in the camera. Pressures of ∼100 kbar have been reached. The phase transition in lanthanum metal reported by Bridgman at 24 kbar and room temperature is associated with a change from a double hexagonal close-packed to a face-centered cubic structure.
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McWhan et al. (1964) studied this question.
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