| 金属铌表面氧化物的热稳定性研究 |
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| 引用本文： | 赵良仲.金属铌表面氧化物的热稳定性研究[J].物理化学学报,1988,4(5):558-560. |
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| 作者姓名： | 赵良仲 |
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| 作者单位： | Institute of Chemistry; Academia Sinica |
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| 摘 要： | 在早期人们认为金属铌只有在高温下才氧化,后来用表面分析方法对金属铌氧化作用的研究结果表明,它在室温下也能氧化。本文用X光电子能谱(XPS)研究了金属铌的氧化行为及其氧化物的热稳定性,发现金属铌的室温表面Nb_2O_5在真空中加热时能转变成金属Nb及其低价氧化物,而高温表面Nb_2O_5在同样条件下则不能转变成金属或其低价氧化物。
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| 收稿时间： | 1987-05-12 |
| 修稿时间： | 1988-03-19 |
XPS STUDY OF THE THERMAL STABILITY OF NIOBIUM SURFACE OXIDES |
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| Zhao Liangzhong.XPS STUDY OF THE THERMAL STABILITY OF NIOBIUM SURFACE OXIDES[J].Acta Physico-Chimica Sinica,1988,4(5):558-560. |
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| Authors: | Zhao Liangzhong |
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| Institution: | Institute of Chemistry; Academia Sinica |
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| Abstract: | XPS studies show that the dominant surface oxide is Nb_2O_5 for air exposed Nb metal at both room temperature and 300 ℃. The thickness of the room temperature Nb_2O_5 formed by 18 hours air exposure is less than the photoelectron escape depth. The room temperature Nb_2O_5 can be converted into Nb metal after heating the sample in vacuum at 350 ℃ for 30 minutes. If the surface Nb_2O_5 is formed at above 300 ℃, however, it can not be converted into Nb metal after heating the sample in vacuum at 350 ℃ for as long as 4 hours. It is suggested that the very thin room temperature surface Nb_2O_5 can differ from the bulk Nb_2O_5 on thermodynamical property. |
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