【摘要】 报道了合成三元二价稀土碘化物的新方法,其优点是操作方便、省时,并避免事先合成易氧化吸水的REI₃或REI₂,特别是当某些稀土元素同时生成二价与三价稀土碘化物而不易分离时,此法最有效,用此法合成了RbTmI₃、KTmI₃、Cs₂mI₄、TISm₂I₅、K₂SmI₅和KSm₂I₄,并测定了它们的性质与结构。更多还原

【Abstract】 A novel method for the synthesis of ternary divalent rare earth iodides is reported. This method has a number of advantages. Among them are convenience in operation, less time-cost, and avoiding separately preparing the air- and moisture-sensitive REI3 or REI2 compounds. It is successful in synthesis of special divalent iodides which is difficult to be separated from the tervalent ones formed concomitantly. By using this method RbTml3, KTmI3, Cs2TmI4, TlSm2I5 and KSm2I5, were synthesized. Their properties and structures were also determined. The structures of RbTmla and KTmI3 belong to orthorhombic system, α=0. 8404 nm, 6= 1. 746 nm, c=1. 1797 nm, and α=0. 8057 nm, 6 = 1. 712 nm, c=1. 1137 nm,respectively. Space group is Pmmm. TlSm2I5 is monoclinic system and α= 1. 002 nm, 6=0. 8910 nm, c=1. 4165 nm,β=90. 99. It is isomorphous with NH4Pb2Cls, space group P2t/c. Cs2TmI4 shows tetragonal system and α=0. 8967 nm, c-1. 1207 nm. Its space group might be assigned to be P4/mmm.更多还原