Acta Phys. -Chim. Sin. ›› 1999, Vol. 15 ›› Issue (05): 426-430.doi: 10.3866/PKU.WHXB19990508

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Valence Stability and Change of Eu(II)in Oxides

Liu Ying-Liang, Feng De-Xiong, Yang Pei-Hui, Shi Chun-Shan   

  1. Department of Chemistry,Ji'nan University,Guangzhou 510632|Laboratory of Rare Earth Chemistry and Physics,Changchun Institute of Applied Chemistry,Chinese Academy of Science,Changchun 130022
  • Received:1998-08-07 Revised:1998-11-09 Published:1999-05-15
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Abstract:

Valence stability and change of Eu(Ⅱ) in oxides have been studied by luminescence spectra. The results show that the valence stability and change of Eu(Ⅱ)in oxides is closely related to the radius and electric charge of positive ions substituted by Eu(Ⅱ) and crystal structure of the host such as Al2O3 which can form α-Al2O3 single phase and α-Al2O3 and γ-Al2O3 mixed phases under different reaction temperatures. A fairly good explanation is made by the proposed relation between energy coefficient and crystal structure for the first time to the observed experiment results. If the energy coefficients of substitution ions is more than that of Eu(Ⅱ), the lattice substitution of Eu(Ⅱ)for these ions is not occured generally and valence state of Eu (Ⅱ)is not stable and be easily changed into Eu(Ⅲ). The lattice of γ-Al2O3 can stablize the valence state of Eu(Ⅱ)within certain coped concentration and in α-Al2O3 crystal lattice Eu (Ⅱ)can be easily changed into Eu (Ⅲ).

Key words: Europium(II), Oxides, Valence stability, Valence change