Systematics and Anomalies in Rare Earth/Aluminum Bromide Vapor Complexes: Thermodynamic Properties of the Vapor Complexes LnAl<sub>3</sub>Br<sub>12</sub> from Ln = Sc to Ln = Lu
作者:Zhi-Chang Wang、Jin Yu
DOI:10.1021/ic061795z
日期:2007.5.1
Systematics and anomalies in the rare earth/aluminum bromide vapor complexes have been investigated by the phase equilibrium-quenching experiments. The measurements suggest that the LnAl3Br12 complexes are the predominant vapor complexes for the 16 rare earth elements Ln = Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu in the temperature range 601-833 K and pressure range 0.01-0
已通过相平衡猝灭实验研究了稀土/溴化铝蒸气配合物中的系统异常。测量结果表明,LnAl3Br12络合物是16种稀土元素的主要气相络合物,Ln = Sc,Y,La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,和Lu在601-833 K的温度范围和0.01-0.22 MPa的压力范围内,这与稀土/氯化铝体系不同,稀土/氯化铝体系的主要络合物是从Ln = La到Ln = Lu的LnAl3Cl12,而对于Ln是LnAl2Cl9 = Sc和Y大致在相同范围内,这表明卤素阴离子半径对稀土蒸气络合物形成的重要性。在温度和压力范围内 气态的Al2Br6和AlBr3是主要物质,LnAl3Br12的摩尔分数通常小于0.01。根据对16种稀土元素的测量值计算出反应LnBr3(s)+(3/2)Al2Br6(g)= LnAl3Br12(g)的热力学函数,然后对放射性元素Ln = Pm进行平