High pressure forms of Ce were studied by means of a Guinier type X-ray diffraction apparatus using Bridgman anvils and boron-epoxy medium. A new allotropic phase of a tetragonal body-centered lattice with two atoms per unit cell was found to exist at pressures higher than 121 kbar. Above 51 kbar, powder patterns corresponding to α' phase were obtained using Bridgman anvils as well as a cubic press, but the crystalline structure could not be determined.
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Endo et al. (1977) studied this question.
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