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我们已经实验证明并报道了Eu-Tb之间、Ce-Yb之间的电荷转移.本文首次实验证实了Ce~(3+)离子和Eu~(3+)离子之间电荷转移现象的存在,进一步阐述了稀土价态与其电子组态共轭特征的相关性.1 实验部分1.1 试剂CaF_2,SrF_2,BaF_2,NH_4HF_2、氢氟酸、盐酸均为分析纯,EuF_3和CeF_3分别由高纯Eu_2O_3(99.95%)及CeO_2(99.99%)自制.1.2 MF_2:Eu,Ce体系的合成按化学计量比(MF_2:X%CeF_2,y%EuF_3;X=1,y=0,0.1,0.3,0.5,1;X=0,0.05,0.1,0.3,0.5,y=1)准确称取原料,放人玛瑙研钵中充分研混后装入刚玉柑涡中,置于管状炉内(用氢气
We have experimentally proved and reported the charge transfer between Eu-Tb and Ce-Yb.The first experiments confirmed the existence of charge transfer between Ce 3+ and Eu 3- ions, The correlation between the valence states of rare earths and the conjugates of their electronic configurations is further elaborated.1 Experimental1.1 Reagents CaF_2, SrF_2, BaF_2, NH_4HF_2, hydrofluoric acid and hydrochloric acid are all analytically pure, and EuF_3 and CeF_3 are prepared from high purity Eu_2O_3 (99.95 %) And CeO 2 (99.99%) .1.2 The synthesis of MF 2: Eu, Ce system According to the stoichiometric ratio (MF_2: X% CeF_2, y% EuF_3; X = 1, y = 0,0.1,0.3,0.5,1; X = 0,0.05,0.1,0.3,0.5, y = 1) Accurately weighed raw materials, placed in agate mortar thoroughly after mixing into corundum citrus vortex, placed in a tubular furnace (with hydrogen