scholarly journals Phase Equilibria in Al2O3-Y2O3-SiO2 System and Phase Separation and Crystallization Behavior of Glass

1991 ◽  
Vol 99 (1147) ◽  
pp. 215-221 ◽  
Author(s):  
Yuichiro MURAKAMI ◽  
Hirokazu YAMAMOTO
Keyword(s):  
Phase Separation ◽  
Phase Equilibria ◽  
Crystallization Behavior ◽  
Sio2 System

scholarly journals Effect of phase separation on crystallization of glasses in the BaO-TiO2-SiO2 system

2009 ◽  
Vol 117 (1361) ◽  
pp. 120-126 ◽  
Author(s):  
Hiroyuki HIJIYA ◽  
Tetsuo KISHI ◽  
Atsuo YASUMORI
Keyword(s):  
Phase Separation ◽  
Sio2 System

Heats of fusion and phase equilibria in the MgOSiO2 system

Calphad ◽  
1989 ◽  
Vol 13 (1) ◽  
pp. 33-43 ◽  
Author(s):  
Reed A. Howald ◽  
Matthew J. Scanlon
Keyword(s):  
Phase Equilibria ◽  
Sio2 System

Phase equilibria in the system ZnCl2 + KI

1974 ◽  
Vol 27 (1) ◽  
pp. 35 ◽  
Author(s):  
AJ Easteal ◽  
PJ O'Rourke
Keyword(s):  
Phase Separation ◽  
Phase Equilibria ◽  
Glass Transitions ◽  
Heating Rates ◽  
Glass Transition Temperatures ◽  
X Ray ◽  
Critical Composition ◽  
Congruently Melting ◽  
Nitrogen Yields ◽  
Liquidus Temperatures

Phase equilibria in the ZnCl2+KI system have been investigated by differential thermal analysis (DTA), and by examination by X-ray powder diffraction of solidified melts. The system evidently behaves as a simple binary, and three congruently melting compounds are formed, viz. 2KI.ZnCl2, 2KI.3ZnCl2 and KI.4ZnC12. Supercooled mixtures from c. 60-90 mole % ZnCl2 visibly phase separate at temperatures for the most part about 30K below the liquidus temperatures, and the phase separation temperatures have been determined by DTA. The composition limits of the metastable immiscibility dome have not been established, but the region of phase separation extends at least to mixtures containing as little as 53 mole % ZnCl2. The critical composition is approximately 80 mole % ZnCl2, and the critical temperature 470 K. Quenching of melts containing 34-100 mole % ZnCl2, in liquid nitrogen, yields glasses. In the region 34-43 mole % ZnCl2 the glasses are partly crystallized. Glass transition temperatures for the wholly glassy mixtures have been evaluated from DTA traces, with heating rates in the range 0.11-0.25 K s-1. Two glass transitions have been observed for mixtures of composition 53-75 mole % ZnCl2.

Structural Characterization and Analysis of Glasses in the Al2O3-B2O3-Fe2O3-Na2O-SiO2 System

2013 ◽  
Vol 1518 ◽  
pp. 47-52
Author(s):  
S.V. Stefanovsky ◽  
B.S. Nikonov ◽  
B.I. Omelyanenko ◽  
K.M. Fox ◽  
J.C. Marra
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Structural Characterization ◽  
Liquid Phase Separation ◽  
Surface Layers ◽  
Crystalline Phases ◽  
Sio2 System ◽  
X Ray ◽  
Heat Treated ◽  
Liquid Liquid Phase Separation

ABSTRACTGlasses in the Al2O3-B2O3-Fe2O3-Na2O-SiO2 system were produced at a temperature of 1150 °C, annealed, and examined using XRD and SEM/EDX. Surfaces of same samples were additionally heat-treated and etched with HCl. The pristine samples were X-ray amorphous and rather homogeneous except the B1 sample that contained trace crystalline phases of carnegieite/nepheline and spinel. Corrosion of these glasses via an etching treatment proceeds by a conventional mechanism with damage of their surface layers, however, the B2 glass exhibits a “drop-type” microstructure after etching that suggests occurrence of liquid-liquid phase separation.

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