5 resultados para RE_2O_3


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用最大气泡压力法,采用三因子一次回归正交设计,研究了Na_3AlF_6-LiF-RE_2O_3体系的表面张力,得出表面张力(Y)与RE_2O_3含量(c_1)、LiF含量(c_2)及溶体温度(t)的回归方程如下:Y=260.78+4.088c_1+0.073c_2+0.557c_1c_2-0.136t-0.00483c_1t-0.00050c_2t。

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以NaCl-NaF体系为还原介质,以RE_2O_3,REOCl,或RE_2(CO_3)_3为原料,以铝为还原剂,在铝熔融过程中直接制备Al-RE应用合金已获得了应用.结果表明,这一方法使用简单,操作方便,不需额外设备,容易为工厂采用.本工作是为这一工艺开展的基础研究工作. 资料对LaCl_3-碱金属氯化物,碱土金属氯化物的表面张力和密度进行了专门总结,对NaCl-NaF-RE_2O_3体系未见报导。

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为了排除和减小电极与熔体接触面间的阻抗,电极与连接导线的电阻以及石英电导池腐蚀的影响,本文用交流四电极法测量了熔体Na_3Na_3AlF_6-Al_3O_3-RE_2O_3的电导率,其中RE指以Ce为主的混合稀土。 实验装置如图1所示,电极为φ0.8mm的Pt和Pt-Rh丝(其中二根Pt、二根Pt-Rh),中

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Surface tension and density of NaCl-NaF-RE2O, melts have been measured by means of maximum buble pressure and Archimedes methods. The results are expressed by two mathematic models. Mass fraction of RE2O5 in the melts from 0.0 to 0.6% and that of NaF/NaCl, 50-90%. This investigation shows that there might be com plexes in the melts. The information obtained can be used as a reference in the preparation of Al-RE alloys.

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本文以RE_2O_3和(NH_4)_2HPO_4为原料制备了REPO_4(RE:La—Lu,Sc和Y)系列样品。研究了REPO_4化合物中磁化率与RE~(3+)离子原子序数的关系。REPO_4的结构分为单斜晶系(La—Gd,Tb)和锆英石型(Tb—Lu,Sc和Y)二种类型结构,测定和讨论了化合物的光谱。