Phase relations of CaO‐Al 2 O 3 ‐Sc 2 O 3 ternary system
Phase relations of CaO‐Al 2 O 3 ‐Sc 2 O 3 ternary system
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DOI：
10.1111/jace.16104
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发表时间：
2018-10
影响因子：
3.9
通讯作者：
Wenke Zhi;Fei Wang;Bin Yang;T. Qu;Yong Deng;Yang Tian;Jinyang Zhao
中科院分区：
文献类型：
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作者：
Wenke Zhi;Fei Wang;Bin Yang;T. Qu;Yong Deng;Yang Tian;Jinyang Zhao
研究了CaO-Al_2 O_3-Sc_2 O_3三元系在1773和1873 K下24小时的等温截面，并在水中淬火以确定操作相平衡。平衡相的组成由电子探针显微分析确定。得到了1773和1873 K两个温度点的等温截面相图。1773 K等温截面由一个液态化合物（L）、六个二元化合物组成（CaO+L、Ca_2Sc_6Al_6O_20 +L、C_3A +L、CaO·Sc_2O_3 +L、CA+L、Ca_2Sc_6Al_6O_20 + Sc_2O_3（Ca2Sc6Al6O20+Sc2O3+ CA 6、Ca2Sc6Al6O20+Sc2O3+L、Ca2Sc6Al6O20+CA+L、Ca2Sc6Al6O20+ CA 2 +CA、Ca2Sc6Al6O20 + CA 2 + CA 6、CaO·Sc2O3 +L+Sc2O3、C3A+CaO+L）。在1873 K时，我们发现了一个液态化合物（L），五个二元化合物（CaO+L、Ca2Sc6Al6O20+L、CaO.Sc2O3+L、CA+L、Ca2Sc6Al6O20+Sc2O3（Ca2Sc6Al6O20+Sc2O3+ CA 6，Ca2Sc6Al6O20+Sc2O3+L，Ca2Sc6Al6O20+CA+L，Ca2Sc6Al6O20+ CA 2 +CA，Ca2Sc6Al6O20 + CA 2 + CA 6，CaO·Sc2O3 +L+Sc2O3）。本工作所获得的实验信息不仅对CaO-Al 2 O3-Sc2 O3三元系的热力学评估至关重要，而且对进一步研究从冶金渣中分离稀土和稀土回收具有重要意义。
We investigated the isothermal section of the CaO‐Al2O3‐Sc2O3ternary 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, Ca2Sc6Al6O20+L C3A+L, CaO.Sc2O3+L, CA+L, Ca2Sc6Al6O20+Sc2O3) and seven ternary compounds (Ca2Sc6Al6O20+Sc2O3+CA6, Ca2Sc6Al6O20+Sc2O3+L, Ca2Sc6Al6O20+CA+L, Ca2Sc6Al6O20+CA2+CA, Ca2Sc6Al6O20+CA2+CA6, CaO.Sc2O3+L+Sc2O3, C3A+CaO+L). At 1873 K, we found one liquid compound (L), five binary compounds (CaO+L, Ca2Sc6Al6O20+L, CaO.Sc2O3+L, CA+L, Ca2Sc6Al6O20+Sc2O3)and six ternary compounds (Ca2Sc6Al6O20+Sc2O3+CA6, Ca2Sc6Al6O20+Sc2O3+L, Ca2Sc6Al6O20+CA+L, Ca2Sc6Al6O20+CA2+CA, Ca2Sc6Al6O20+CA2+CA6, CaO.Sc2O3+L+Sc2O3) 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‐Al2O3‐Sc2O3ternary system, but also is important for further investigation on separation of rare earths from metallurgical slags and rare‐earth recovery.