Praseodymium metal undergoes a crystallographic phase transformation from a distorted fcc lattice to a distorted hcp structure at a pressure of ≃210 kbar. The phase change is accompanied by a large volume decrease of ≃19%. This decrease is analogous to the volume collapse at the γ-α transition in cerium and thus provides strong evidence for a delocalization of the 4 f2 configuration into a 4f conduction band.
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Mao et al. (1981) studied this question.