863 



effects could be fixed on the temperciture-time-curves very acciinilely ; 

 and if* the furnace was run at a higher speed, a,i;ain these tenipcratuivs 

 Avere reproducible within ca. 1°C; they therefore can be considered 

 as temperatures of true equilibrium. 



Meltingpointdiagram of the Binary System: Z./2O— 5/09. 

 (Thermoelement II placed in the mass). 



o c 



^ X 



Observed 



Temperatures 



in Int. 



Microvolts : 



Observed 



Temperatures 



in o C. 



Corr.Temp. 



in intern. 

 Microvolts 



Corr. Temp, 

 in ° C. 





 1 

 3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



*14 



15 



*16 



n 



2d 



10958 



1st 

 Effect 



1029 



1030 



1030.5 



1030.5 



1035 



1036 



11624 I 1029.5 

 11992 — 



11908 

 11622 

 10680 

 10732 

 11600 

 12154 

 12448 

 12634 

 12440 



1020 



1025 



1026.5 



1026.5. 



1024.5 



1014.5 



1021 



1022 



2d 



Effect 



1115 



1170.5 



1201 



1194 



1170.5 



1092 



1097 



1169.5 



1215 



1239 



1255 



1238.5 



* The marked preparations must accidentally have been changed before analysis; 

 we had however afterwards no means to ascertain this. 



It may be remarked, tliat a [(reparation, ha\ ing exactly the 

 composition of the orthosilicate, always gave a slight heat-effect, 

 corresponding with a eutectic temperature. We were able to show, 

 that the cause of this phenomenon is the high volatility of the 

 Li^O: after one single meltingpointdelermination, already a loss oï Li^O 



