358 P. Eshola — Silicates of Strontium and Barium. 



Fig. 12. 



1 640 





1 1 1 1 — 



— i 1 1 1 1 



1 600 







J 



1560 







- 



1520 



- 





/ " 



1480 



- 





/ - 







\ 



/ 



1440 







/ 



140 



- 



oc-CaO-SiOs. \ 



/ 







and 1 (' c( u \ d' \ 



/ 



1560 

 1320 



- 



x / : 







1 ' ^~-^ / BaO-SiOj. 









^\ t and liquid 

 £CaOBaO-35i0 2 :C \ r 



1280 





ot-CaO-S'i 0^ 



and liquid *\/- 





+ * + + + 



1240 



- 



and 2 CaO.BaO-35iO a 



- 





- 





2CaO- Ba0-35i0 2 and BaO-5iO a 



1 200 



- 





- 





/3-CaO-Sio 5 and 2Ca0-Ba0-3 S«O a 



10 50 30 40 50 60 70 80 SO 100 



Ca0-Si0 a _ BaOSiOa. 



Tig. 12. — Temperature-concentration diagram of the binary system 

 CaO.Si0 2 -BaO.SiCK 



As it was thought possible that there could exist solid 

 solutions between the double compound and BaO.Si0 2 , 

 I determined the refractive indices of the exceedingly 

 small crystals in preparations with 55 and 60 per cent 



