P. EsJcola — Silicates' of Strontium and Barium. 35& 



The System CaO.Si0 2 -SrO.Si0 2 



The quenches made to establish the melting diagram of 

 mixtures of the metasilicates of calcium and strontium 

 are recorded in table IV. 











Table IV. 





Composition wt. per cent 









( 



3xides 





Silicates Temper 



-Time 









CaO. 



SrO. ature 



min 



Kesulting phases 



CaO 



SrO 



Si0 2 



Si0 2 



Si0 2 °C 



utes 





36.13 



15.81 



48.06 



75 



25 1495 



15 



Glass 



36.13 



15.81 



48.06 



75 



25 1485 



15 



Mix crystals 



30.11 



23.71 



46.18 



62.5 



37.5 1482 



15 



Mix crystals and glass 



30.11 



23.71 



46.18 



62.5 



37.5 1474 



15 



Mix crystals 



24.09 



31.61 



44.30 



50 



50 1482 



15 



Glass 



24.09 



31.61 



44.30 



50 



50 1478 



15 



Glass and mix crystals 



24.09 



31.61 



44.30 



50 



50 1474 



15 



Mix crystals 



21.08 



35.56 



43.36 



43.75 



56.25 1477 



15 



Glass 



21.08 



35.56 



43.36 



43.75 



56.25 1472 



15 



Mix crystals 



12.05 



47.41 



40.54 



25 



75 1511 



15 



Glass 



12.05 



47.41 



40.54 



25 



75 1507 



15 



Glass and mix crystals 



12.05 



47.41 



40.54 



25 



75 1500 



15 



Mix crystals and glass 



12.05 



47.41 



40.54 



25 



75 1496 



15 



Mix crystals 



As these data, together with the optical study of the 

 mix crystals obtained, seemed fully to establish the 

 general character of the melting diagram (fig. 10), it was 

 considered unnecessary to determine the curve in more 



Fig. 10. 



CaO-SiO^ SrOSiO^ 



Fig. 10. — Temperature-concentration diagram of the binary system 

 CaO.Si0 2 -SrO.Si0 2 showing a complete series of mix crystals with a minimum. 



detail. Assuming as the melting point 21 of a-CaO.Si0 2 , 

 1540 ° ; and of SrO.Si0 2 , 1578° (cf. above, p. 335), we get 

 the diagram reproduced in fig. 10. 



21 G. A. Eankin and F. E. Wright, this Journal (4) 39, 1, 1915. 



