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qiangchw04

银虫 (小有名气)

[交流] 【求助】如何区分Fe3O4和γ-Fe2O3 已有15人参与

各位高手能帮帮我吗?怎么区分Fe3O4和γ-Fe2O3?谢谢你们啊
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遥想魏晋

木虫 (初入文坛)


小木虫: 金币+0.5, 给个红包,谢谢回帖
Usually, it is not easy to distinguish γ-Fe2O3 from Fe3O4 in XRD patterns because of their similar structures. Therefore, another characterization method, X-ray photoelectron spectrum, was also used to differentiate the structures of iron oxides as presented in the Fe 2p core-level XPS spectra of γ-Fe2O3, Fe3O4 and α-Fe2O3 (Fig. 2). Both spectra of γ-Fe2O3 and α-Fe2O3 show very similar patterns with main peak of Fe 2p3/2 around 710.8 eV, which is attributed to the Fe3+ component in γ-Fe2O3 and α-Fe2O3. As we know, the XPS Fe 2p core-level spectra of γ-Fe2O3 and α-Fe2O3 are almost identical with each other despite their large differences in crystal structures [21]. On the other hand, the binding energy of Fe 2p3/2 of the Fe2+ component in Fe3O4 is around 708.5 eV [22]. Therefore, the two samples can be assigned to γ-Fe2O3 or α-Fe2O3. As observed in their spectra, the Fe 2p3/2 and 2p1/2 main peak of two samples is accompanied by a satellite structure around 718.9 eV. Just as proven in other work [21], the XPS Fe 2p spectrum of γ-Fe2O3 possesses smaller satellite intensity as compared with that of α-Fe2O3 due to the larger Fe 3d to O 2p hybridization in γ-Fe2O3. The Fe 2p3/2 peak in the spectrum of Fe3O4 sample is much wider than those in γ-Fe2O3 and α-Fe2O3, which is considered to be composed of two peaks in the positions of 708.6 and 710.8 eV. The binding energy of 708.6 eV is attributed to Fe3O4, while 710.8 eV can be assigned to γ-Fe2O3. This is because Fe3O4 nanoparticles are quite sensitive to oxygen even at low temperature, resulting in the oxidation of the surface of Fe3O4 nanoparticles to γ-Fe2O3 during the drying and preparation of XPS samples.
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36楼2015-03-10 18:22:12
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吓吓虫

木虫 (著名写手)


Small(金币+1):谢谢参与 2010-06-27 16:05:13
引用回帖:
Originally posted by refnew at 2010-06-18 14:42:23:
xps 可以

赞同此观点
XPS : Fe2p3/2 and Fe2p1/2,  710.35 and 724.0 eV for γ-Fe2O3 and 711.29 and 724.82 eV for Fe3O4.
3楼2010-06-18 15:38:22
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zhaohaixing

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一般的四氧化三铁是有顺磁性的,量多的话用磁铁就可以检测出来,但是三氧化二铁却没有,很简单,祝你实验成功啊,当然要发论文的话还是做个XPS吧,呵呵
学会选择,懂得放弃,有信心不一定会赢,没信心一定会输
4楼2010-06-18 15:46:03
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qiangchw04

银虫 (小有名气)

引用回帖:
Originally posted by zhaohaixing at 2010-06-18 15:46:03:
一般的四氧化三铁是有顺磁性的,量多的话用磁铁就可以检测出来,但是三氧化二铁却没有,很简单,祝你实验成功啊,当然要发论文的话还是做个XPS吧,呵呵

如果是两个混合物呢?磁铁不就分辨不出来了吗?除了XPS还有什么可以?
5楼2010-06-22 15:40:00
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