【摘要】 <正> 众所周知,希土氯化物熔盐体系相图对于熔盐电解制备希土金属具有重要意义。PrCl₃-NaCl与BaCl₂-NaCl体系均属简单低共熔体系;PrCl₃-BaCl₂体系属于有一化合物Ba₃PrCl₈分解的相图类型。而PrCl₃-BaCl₂-NaCl三元体系尚未见文献报道。本文在重新考察各相关二元体系相图的基础上测定了本体系相图,共测定五个多温截面,其分布见图1。更多还原

【Abstract】 The phase diagram of PrCl3-BaCl2-NaCl ternary system has been investigated by means of DTA and X-ray diffraction analysis. It was found that there are five surfaces corresponding to the primary crystallization of PrCl3 ,α-BaCl2, β-BaCl2, NaCl and Ba3PrCl8 respectively, and six univariant lines related to the secondary crystallization in this system. The temperature of the ternary eutectic, composed of 68.5wt.% PrCl3, 1.5wt.% BaCl2 , 30.0wt.% NaCl, was determined to be 451℃. The temperature of the ternary peritectic, composed of 62.0 wt.% PrCl3, 24.0wt.% NaCl, 14.0wt. % BaCl2, was observed to be 510℃. A compound,formed in the solid state,was found. The temperature of decomposition occurs at 425℃.更多还原