1167 



Chemistry. — "Tlw metastahh' contmuatioii of the mked cn/staJ 

 series oj pseudo components in connection loitli tJie phenomenon 

 of allot'-opy'. By Prof. A. Smits. (Comiiinnicated by Prof. 

 J. D. VAN DKR Waals). 



(Communicated in tho meeting of March 28, 1914). 



1. For the case that a nnarv system is built np of two pseudo- 

 coiiiponents the relation between the unary and the pseudo-binary 

 system has been derived by me by making use of (tihbs's principle 

 of equilibrium, which states that a system at constant temperature 

 and pressure tends to pass to such a state that the thermodynamic 

 potential (tj-function) is a minimum. ') 



In this it has been assumed that when heterogeneous allotropy 

 occurs in the solid state, the ?-,f-curve has a shape as indicated in 

 tig. 1. This assumption comes to this that there exists continuity in 

 the unstable region between the two mixed crystal series, Avhich 



1) Z. t. phys. Chem. : 76, 421 (1911). 

 Proceedings Royal Acad. Amsterdam. Vol. XVI. 



