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Experimental study of phase equilibria in the Mn0-"TiO2"-"Ti2O3" system

Title
Experimental study of phase equilibria in the Mn0-"TiO2"-"Ti2O3" system
Authors
Kang, YBLEE, HAE GEON
POSTECH Authors
Kang, YB
Date Issued
2005-01
Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKA
Abstract
Phase equilibria and liquiclus in the system MnO-"TiO2"-"TiO3" under controlled atmosphere have been investigated in the temperature range from 1300 to 1 550 degrees C and in the range of log pO(2) (in atm) from -7.2 (pCO/pCO(2) = 1) to -16.6 (C-CO equilibration). High-temperature equilibration, quenching and electron probe microanalysis (EPMA) were employed to obtain equilibrium compositions of liquid and several solid solutions. The following phases have been observed
molten oxide, manganosite (MnO (s.s.)), rutile (TiO2-delta (s.s.)), spinel (Mn2TiO4-MnTi2O4), pyrophanite (MnTiO3-Ti2O3) and pseudobrookite ("MnTi2O5"-Ti3O5) solid solutions. Liquidus of manganosite and rutile were measured and compared with previous investigations. "MnTi2O5" compound was confirmed to be unstable phase in the MnO-"TiO2" system. It was found in the present study that sub-solidus phase equilibria are affected considerably by oxygen partial pressure.
Phase equilibria and liquiclus in the system MnO-"TiO2"-"TiO3" under controlled atmosphere have been investigated in the temperature range from 1300 to 1 550 degrees C and in the range of log pO(2) (in atm) from -7.2 (pCO/pCO(2) = 1) to -16.6 (C-CO equilibration). High-temperature equilibration, quenching and electron probe microanalysis (EPMA) were employed to obtain equilibrium compositions of liquid and several solid solutions. The following phases have been observed; molten oxide, manganosite (MnO (s.s.)), rutile (TiO2-delta (s.s.)), spinel (Mn2TiO4-MnTi2O4), pyrophanite (MnTiO3-Ti2O3) and pseudobrookite ("MnTi2O5"-Ti3O5) solid solutions. Liquidus of manganosite and rutile were measured and compared with previous investigations. "MnTi2O5" compound was confirmed to be unstable phase in the MnO-"TiO2" system. It was found in the present study that sub-solidus phase equilibria are affected considerably by oxygen partial pressure.
URI
https://oasis.postech.ac.kr/handle/2014.oak/15765
DOI
10.2355/isijinternational.45.1543
ISSN
0915-1559
Article Type
Article
Citation
ISIJ INTERNATIONAL, vol. 45, no. 11, page. 1543 - 1551, 2005-01
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강윤배KANG, YOUN-BAE
Ferrous & Energy materials Technology
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