14 FUNDAMENTALS OF SUBM I C RO SC OPI C MORPHOLOGY I 



Fig. 8 



%^®^ 



at 







Fig. 9 



Fig. lo 



Fig. II Fig. 12 Fig. 13 



Homogeneous states of the compound ABj. QA, B, ^ E. 

 Fig. 8. Solid - Fig. 9. Liquid - Fig. 10. Gaseous - Fig. 11. Homogeneous solution of 



EBj in AB2. 



Mixed crystals (A, E) Bg. 

 Fig. 12. Homogeneous - Fig. 13. Heterogeneous. 



polar particles such as, for instance, water molecules are arranged 

 homogeneously. Fig. 6 shows such particles in a statistically homoge- 

 neous distribution and Fig. 7 gives an example of an arrangement in a 

 lattice which has identical spacings in three directions. 



From these considerations we derive the following definition of 

 homogeneity: an object is homogeneous if equal and equally oriented parts, 

 taken arbitrarily from the object, possess the same internal structure. This 

 implies that all the parts thus compared have the same physical and 

 chemical properties. 



An important condition in these considerations is the order of 

 magnitude of the volumes to be compared. Physico-chemical homo- 



