Abstract

It is shown that the high-pressure state equation and the alpha -P correlation of NiX2 (X=F, Cl, Br or I) determined by Zhao and Du (1986) from the pressure spectra shifts of NiCl2 and NiBr2 based on their mu k alpha model and fitting procedure are not supported by a great many theoretical analyses and experimental facts, and the pressure behaviours of NiF2 and NiI2 predicted by them, using the above state equation and the alpha -P correlation, are also doubtful. Thus both the mu k alpha model and their fitting procedure may be held to be faulty and unreliable. Hence, the conclusions based on this model should be rejected.

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