Thermodynamics of lanthanide elements III. Molar enthalpies of formation of Tb3+(aq(, Ho3+(aq), Yb3+(aq), Yb2+(aq), TbBr3(cr), HoBr3(cr), and YbBr3(cr) at 298.15 K
作者:S. Bettonville、J. Goudiakas、J. Fuger
DOI:10.1016/0021-9614(87)90065-6
日期:1987.6
Enthalpies of solution of high-purity terbium, holmium, and ytterbium metals and of the corresponding tribromides in aqueous hydrochloric acid of various molalities lead to the following standard molar enthalpies of formation ΔfHmo/(kJ · mol−1) at 298.15 K: Tb3+) (aq), −(698.3 ± 1.5); Ho3+(aq), −(707.2 ± 2.4); Yb3+(aq), −(670.5 ± 2.7); Yb2+(aq), −(530.4 ± 3.3); TbBr3(cr), −(839.1 ± 2.4); HoBr3(cr)
高纯度铽、钬和镱金属以及相应的三溴化物在各种摩尔浓度的盐酸水溶液中的溶液焓导致以下标准摩尔形成焓 ΔfHmo/(kJ·mol-1) 在 298.15 K:Tb3+) (aq), -(698.3 ± 1.5); Ho3+(aq), -(707.2 ± 2.4); Yb3+(aq), -(670.5 ± 2.7); Yb2+(aq), -(530.4 ± 3.3); TbBr3(cr), -(839.1 ± 2.4); HoBr3(cr), -(842.1 ± 2.7); YbBr3(cr), -(793.8 ± 2.4)。-(1.06 ± 0.05) V 的值是从上述反应的标准电位结果推导出来的:Yb3+ + 12H2 = Yb2+ +H +,通过使用合适的熵值。这些结果被讨论并与以前的实验或评估值进行比较。