226 Table 245. 



TRANSFORMATION AND MELTING TEMPERATURES OF LIME-ALUMINA- 

 SILICA COMPOUNDS AND EUTECTIC MIXTURES. 



The majority of these determinations are by G. A. Rankin. (Part unpublished.) 



Substance. 



CaSiOs 

 CaSiOs 

 Ca2Si04 



CasSi207 . 



CasSiOs . 



CasAlgOe . 

 CasAleOu 

 CaAl.204 . 

 CagAlioOis 

 AlaSiOg . 

 CaAl2Si208 

 CaaAlaSiOv 

 CasAlgSiOg 



% CaO AI2O3 SiO. 



48.2 



48.2 



65. 



65- 



6S- 



58.2 



73-6 



62.2 



47.8 

 354 

 24.6 



20.1 

 40.8 

 50-9 



— SI -8 



— S1.8 



— 35- 



— 35- 



— 35- 



— 41.8 



_ 26.4 



37.8 - 



52.2 — 



64.6 — 



75.2 — 



62.8 37.1 

 366 43-3 

 37.2 22.0 



30.9 18.2 



Transformation. 



Melting 



o to i3 and reverse 



Melting 



7 to /3 and reverse 



^ to a and reverse 



Dissociation into Ca2Si04 and 



liquid 



Dissociation into Ca2Si04 and 



CaO . 



Dissociation into CaO and liquid 



Melting 



Melting 



Melting 



Melting 



Melting 



Melting 



Dissociation into Ca2Si04+ 



Ca2A]2Si07 and liquid . . 



Temp. 



I 540° -1-2° 

 1200 -j-2 



2130 J^io 



675 is 



1420 ±2 



1475 ±5 



1900 is 



153s ±5 



1455 is 



1600 ^5 

 1720 -J-io 



1816 ^10 



iSSO ±2 



1590 J^2 



133s its 



EUTECTICS. 



Crystalline Phases. % CaO AUOj SiO^ Xemp^ 



CaSiOs.SiOi 



Ca.SiOs I 



3Ca0,2Si02 [ 



Ca.SiOi \ 



CaO. S 

 Al2Si05,Si02 

 AlaSiOs.AlsOa 



CaAliSioOs I 



CaSiOs S 



CaAliSiaOg [ 



Si02 \ 



CaAl2Si208 ) 



Si02,CaSi03 J 



Ca2Al2Si07 \ 



Ca2Si04 ) 



AI2O3 i 



CaAlsSioOg j 



CaAl2Si208 ) 



Al2Si05,Si02 ( 



CaaAliSiOy } 



CasAhoOis S 



Ca2A]2Si07 ( 



CaAUOi ) 



Ca2Al2Si07 ) 



CaAUOi > 



CasAhoOis ) 



CaAlaSioOg | 



Ca2Al2Si07 ( 



Ca2Al2Si07 i 



Ca3Si207 > 



CaSiOs ) 



Ca2A]2Si07 \ 



CaSiOs i 



37- 

 54-5 



67.S 



34-1 

 10.5 

 23.2 

 49.6 



19-3 

 9.8 



35- 

 37-8 



37-S 

 30.2 

 47.2 

 45-7 



13- 

 64. 



18.6 

 19.5 

 14.8 

 237 

 39-3 

 19.8 

 50.8 

 S2-9 

 53-2 

 36.8 

 11.8 

 13.2 



63- 



45-5 



32-S 



87. 



36. 



47-3 



70. 



62. 



26.7 



41.4 



70.4 



14.2 

 9-3 

 9-3 



33- 



41. 



41. 1 



1436° 



i455± 



2065-t-; 



1610 

 1810 



1299 



1359 

 1 165 



154s 

 IS47 

 134s 

 1552 

 1512 



I SOS 

 13SS 

 1310 

 1316 



EUTECTICS. 



Crystalline Phases. 



CaAlaSisOg 



Ca2A]2Si07 



CaSiOs 



CaAlaSioOg 



Ca.,Al2Si07 



AI2O3 



Ca2Si04 



CaAl204 



CasAleOu 



% CaO AI2O3 SiO, 



38. 20, 42. 

 29.2 39. 31.8 

 49-5 43-7 6.8 



Meltinj 

 Temp. 



1265' 

 1380 

 1335 



QUINTUPLE POINTS. 



CaiAliSiOT 



Ca3Si07 



Ca2Si04 



Ca2Al2Si07 



Ca2Si04 



CaAlo04 



CaAl2Si208 



AI2OS 



AUSiOs 



CasAlioOig 



CaoAl2Si07 



AI2O3 



48.2 II. 9 39.9 



48.3 42. 9.7 



iS-6 36-5 47-9 



31.2 44.5 24.3 



133s 

 1380 

 1512 

 1475 



QUADRUPLE POINTS. 



3Ca0.2Si02 

 2CaO.Si02 



5S-5 — 



44-5 



1475 



The accuracy of the melting-points is 5 to 10 units. Geophysical Laboratory. See also Day and Sosman, Am. J. 



of Sc. xxxi, p. 341, iqil. 



Smithsonian Tables. 



