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摘要: 经过高温高压合成的CeTbO3+进行了XPS研究,发现在1.0 GPa下,Tb4+在~600 ℃开始转变成Tb3+,而Ce4+在~800 ℃开始向Ce3+转变。在1 000~1 200 ℃形成单相萤石结构化合物CeTbO3+的Ce是以Ce3+、Ce4+混合价形式存在,Tb全部变成Tb3+。实验表明,用Ce3d谱上~888 eV峰的峰位及其与882 eV峰的相对强度变化可以定性判断化合物中是否含有Ce3+。研究了高温高压合成的CeTbO3+的稳定性随时间的变化问题。Abstract: The samples of CeTbO3+ synthesized by high pressure and high temperature were studied by XPS. It is found that Tb4+ ion begins to transform to Tb3+ at about 600 ℃ and Ce4+ to Ce3+ about 800 ℃. The single phase compound of CeTbO3+ having a fluorite structure is formed at 1000 ℃, in which the Ce ions exist in a mixed valence state of Ce3+ and Ce4+. The existence of Ce3+ ions in compounds can be determined by the shift of the 888 eV photoelectron peak and the change of the relative intensity between this peak and the 882 eV peak. The stability of CeTbO3+ synthesized by high pressure and temperature with the time was investigated.
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Key words:
- high temperature and high pressure /
- XPS /
- CeTbO3+ /
- Tb /
- Ce /
- valence state
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苏文辉, 刘宏建, 李莉萍, 等. 吉林大学自然科学学报, 1992, 特刊: 188. Allan K, Campion A, Zhou J, et al. Phys Rev, 1990, B41: 11572; 高压物理学报, 1992, 6(1): 7. 周建十. 低温物理学报, 1992, 14(6): 403. Seifert K F. Fortschr Mineral, 1968, 45(2): 214. 刘宏建, 苏文辉, 等. 高压物理学报, 1990, 4(4): 284. 周建十, 苏文辉. 中国稀土学报, 1988, 6(2): 57. 李莉萍, 魏诠, 苏文辉, 等. 高等学校化学学报, 1992, 3(2): 217. Praline G, Koel B E. J Elec Spec Rel Phen, 1980, 21: 17. Wagner C D, Riggs W M, Davis L E, et al, eds. Handbook of X-ray photoelectron spectroscopy. USA: Physical Electronics Division, Perkin-Elmer Corporation, 1979. 赵良仲. 物理学报, 1989, 38(6): 987. Strydom C A. Inorg Chem Acta, 1989, 161: 7. -
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