The Barium Siliconiobates and Related Phases

Jack in The High Temperature Chemistry of Inorganic and Ceramic Materials , ed. F. P. Glasser and P. E. Potter, The Chemical Society, London, 1977, p. 204. 

Groult, M. J. Chailleux, J. Choisnet, and B. Raveau, J. Solid State Chem., 1976, 19, 235. 

The phases described here are certainly not the only ones to be found in this system, and variation of preparation conditions, particularly heating temperature and the duration of heat treatment, will certainly produce others. The system, therefore, seems to fall into the category of infinitely adaptive phases originally described by Anderson.For our purposes it is sufficient to note that changes in stoicheiometry are reflected in changes in structure and not by alterations in a point-defect population. 

---