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Phase relations of CaO‐Al 2 O 3 ‐Sc 2 O 3 ternary system
Author(s) -
Zhi Wenke,
Wang Fei,
Yang Bin,
Qu Tao,
Deng Yong,
Tian Yang,
Zhao Jinyang
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - Romanian
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16104
Subject(s) - isothermal process , phase diagram , ternary operation , ternary numeral system , crystallography , chemistry , analytical chemistry (journal) , phase (matter) , thermodynamics , physics , organic chemistry , chromatography , computer science , programming language
Abstract We investigated the isothermal section of the CaO‐Al 2 O 3 ‐Sc 2 O 3 ternary system at 1773 and 1873 K for 24 hours in Ar, and quenched in water to determine the operative phase equilibrate. The composition of the phases in equilibrium was determined by electron probe microanalysis. The isothermal section phase diagram of two temperature points (1773 and 1873 K) is obtained. The 1773 K isothermal section consists of one liquid compound (L), six binary compounds (CaO+L, Ca 2 Sc 6 Al 6 O 20 +L C 3 A+L, CaO.Sc 2 O 3 +L, CA +L, Ca 2 Sc 6 Al 6 O 20 +Sc 2 O 3 ) and seven ternary compounds (Ca 2 Sc 6 Al 6 O 20 +Sc 2 O 3 + CA 6 , Ca 2 Sc 6 Al 6 O 20 +Sc 2 O 3 +L, Ca 2 Sc 6 Al 6 O 20 + CA +L, Ca 2 Sc 6 Al 6 O 20 + CA 2 + CA , Ca 2 Sc 6 Al 6 O 20 + CA 2 + CA 6 , CaO.Sc 2 O 3 +L+Sc 2 O 3 , C 3 A+CaO+L). At 1873 K, we found one liquid compound (L), five binary compounds (CaO+L, Ca 2 Sc 6 Al 6 O 20 +L, CaO.Sc 2 O 3 +L, CA +L, Ca 2 Sc 6 Al 6 O 20 +Sc 2 O 3) and six ternary compounds (Ca 2 Sc 6 Al 6 O 20 +Sc 2 O 3 + CA 6 , Ca 2 Sc 6 Al 6 O 20 +Sc 2 O 3 +L, Ca 2 Sc 6 Al 6 O 20 + CA +L, Ca 2 Sc 6 Al 6 O 20 + CA 2 + CA , Ca 2 Sc 6 Al 6 O 20 + CA 2 + CA 6 , CaO.Sc 2 O 3 +L+Sc 2 O 3 ) to exist at the isothermal section. The experimental information obtained in the present work not only is essential for the thermodynamic assessment of the CaO‐Al 2 O 3 ‐Sc 2 O 3 ternary system, but also is important for further investigation on separation of rare earths from metallurgical slags and rare‐earth recovery.