ALLOYS ON THE BASIS OF PALLADIUM. CRYSTALLO-GEOMETRICAL AND CRYSTALLO-CHEMICAL PARAMETERS

The article presents the results of the analysis of phase equilibrium of  the ordered phases  in binary systems on  the basis of Pd palladium Pd – Me  (where Me – Co, Rh,  Ir, Cu, Ag, Au, Ni, Pt)  to find correlations of crystallochemical and crystallogeometrical factors. It is established that packing index in disordered solid solutions in binary systems based on palladium  is close  to  the value of 0.74 against the background of a isignifiant deviation of the atomic volumes from the law Zena.  It  is  revealed  that  the  increase  in  a hydrogen diffusion  in binary alloys of Cu – Pd system correlates with considerable decrease in a packing index in the ordered phase B2 in the field of 40  %  Pd (at). It  is established  that different  structural and phase  states are  formed in  binary  Pd – Me  systems  at  certain  combinations  of  temperature and dimensional factors. The diagram  in  the coordinates  temperature factor  – size factor  is constructed. This diagram  is divided  into  three ranges which allow to categorize structurallyphase states depending on the ratio of the temperature and size parameters in binary systems based on Pd. Range  I  includes  system  forming  solid  solutions only; Range   II contains systems  in which ordered phases are  formed  from solid solutions; Range – III is a compounds range where a solid solutions layering occurs. 

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