Citation: Liu Ying-Liang, Feng De-Xiong, Yang Pei-Hui, Shi Chun-Shan. Valence Stability and Change of Eu(II)in Oxides[J]. Acta Physico-Chimica Sinica, 1999, 15(05): 426-430. doi: 10.3866/PKU.WHXB19990508
氧化物体系中Eu2+的价态稳定和转换
English
Valence Stability and Change of Eu(II)in Oxides
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 od 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).
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Key words:
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Europium(II)
- / Oxides
- / Valence stability
- / Valence change
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