

360 P. Eskola — Silicates of Strontium and Barium. 







Table VII 









v 



Glasses 



in the system 



SrO-Si0 2 . 







Wt. % SrO 

 Wt.% SiO, 

 Formula 



46.2 



53.8 



Sr0.2Si0 2 



50 

 50 



60 

 40 



63.2 



36.8 

 SrO.Si0 2 



67 

 33 



h(F) 

 w(Tl) 

 n(0) 

 »(G) 



Density 



1.591 

 1.587 

 1.584 

 1.581 

 3.201 



1.598 

 1.595 

 1.5915 

 1.589 



1.632 

 1.627 

 1.624 

 1.621 



1.640 

 1.636 

 1.632 

 1.629 

 3.537a 



1.652 



1.648 

 1.644 

 1.641 



a Calculated from the value of specific gravity, <Z(4°) =3.540, given by 

 Jaeger and Van Klooster, op. cit. 902. 



Table VIII. 



Glasses in the system BaO-Si0 2 . 



"Wt. % BaO 



45 



Wt. % Si0 2 



55 



n(F) 



1.576 



n(Tl) 



1.571 



n(D) 



1.5665 



n(O) 



1.5635 



Density 



— 



50 



56 



65 



50 



44 

 Ba0.2Si0 2 



35 



1.593 



1.617 



1.653 



1.589 



1.612 



1.648 



1.585 



1.6085 



1.645 



1.582 



1.605 



1.641 



3.441 



— 



— 















Figs. 



L3, 14. 





























1.670 















r 





























TJ 

 



c 















4 



1.6 60 



1.650 



1.640 



1.630 



1.620 



1.610 



1.600 



1.590 



1.580 



1.570 



1.560 

 (.550 





























w 











/// 



7/ 















A 













//// 















//, 



V 











//a 



'// 













/. 













/ 



/// 















Aw 



V 











/// 



'/ 













://, 



V 













{/// 













A 



W 















// 











F 





'/ 











/ 



//// 













Tl 



D 

 C 



'// 









































A 















t 



foWtfrSr 



O 5 



3 



6 







7 



A 



■OWtfBaC 



5 



3 



6 







7 







eoWU-SiO^ 50 40 30 60WteSi0£ 50 40 



Fig. 13. — Variation of the indices of refraction in strontium silicate 

 glasses. 



Fig. 14.t — Variation of the indices of refraction in barium silicate glasses. 



30 



