The transition from the Ih phase (P6 3 /mmc) to the XI phase, supposed to belong to the space group Cmc2 1 , is discussed, respecting the symmetry aspect and the Bernal-Fowler rule. The transition derived from the present model is strongly of the first order in a good agreement with experimental observations, confirming the results obtained by previous works.
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Yoshihiro Ishibashi (1994) studied this question.
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