Rankin and Wright — Ternary System CaO-Alfi^SiO v 25 



concentrations and fully 7000 heat treatments and micro- 

 scopical examinations. 



When the compositions within each field, along each bound- 

 ary curve, and at each quintuple point are known, it is still 

 necessary to determine the composition of each unknown 



Fig. 6. 



s.o 2 



,AI 2 SiO s 

 VI 



i 2 o 3 







3CaO.AI 2 3 



CaO.AI 2 3 



Fig. 6. Projection of concentration-temperature diagram for the ternary 

 system CaO-Al 2 03-Si0 2 , giving compositions whose primary phases deter- 

 mined the location of boundary curves and quintuple points. 



crystalline phase, and the equilibrium temperature within the 

 fields, along the boundary curves and at each quintuple point. 

 Examination of fig. 6 shows : that there are three new crys- 

 talline phases, not found in the binary series, which are ternary 

 compounds ; that there are 14 fields, 30 boundary curves and 

 21 quintuple points. 



