An octahedral multi-anvil apparatus has been developed for the study of X-ray diffraction under high pressure. High pressures up to 150 kbar can be generated in the centre of split cones when they move together as external load is applied upon the outer surfaces. The X-ray beam is focused to the specimen through a horizontal plane between the two cones. Standard Debye-Scherrer camera method is utilized. The pressures required for the transitions of bismuth I-II, bismuth V-VI, tin I-II and lead I-II are determined from the lattice parameter of sodium chloride.
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