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风雨182木虫 (正式写手)
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为了研究掺杂元素与晶相间的关系，在450 ℃时分别制备了纯TiO2，N掺杂TiO2，S掺杂TiO2和N、S共掺杂的TiO2。图5-1表明了相同焙烧温度下不同组分掺杂的TiO2光催化剂的XRD图。由图中可以看出，纯TiO2在2θ为25.4°、37.8°、48.1°和27.5°、36.1°、41.3°、54.4°附近分别有锐钛矿相和金红石相的特征峰出现，说明在450 ℃焙烧时得到纯TiO2包含锐钛矿型和金红石型两种晶型。N掺杂TiO2在2θ为27.5°、36.1°、54.4°附近出现较强的金红石相特征峰，在2θ为25.4°处有一个较弱的锐钛矿相特征峰，说明N掺杂TiO2主要是金红石型。S掺杂TiO2在2θ为25.4°、37.8°、48.1°附近出现较强的锐钛矿相特征峰，在2θ为27.5°、36.1°、54.4°附近有较弱的金红石相特征峰，但金红石相所占比例较小。N-S共掺杂TiO2在2θ为25.4°、48.1°处有较强的锐钛矿相特征峰，在2θ为27.5°、36.1°、54.4°附近出现较弱的金红石相特征峰，说明该样品以锐钛矿型为主。N-S共掺杂的TiO2与仅有S掺杂的TiO2相比，峰型更尖锐，说明结晶度更好一些。 请不要直接复制翻译软件！！！ |
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pure, N-doped, S-doped and N-S doped TiO2 samples were
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prepared at 450 degree C for studying effects of doping on TiO2 crystal phases. Fig. 5-1 gives the x-ray diffraction patterns of all these photocatalytic TiO2 samples. from the x-ray diffraction pattern of the pure TiO2 sample in the figure, the x-ray diffraction peaks can be grouped into two sets with 2θ positions at (25.4°、37.8° and 48.1°) for one set and at (27.5°、36.1°、41.3° and 54.4°) for another, which are, respectively, corresponding to the characteristic x-ray diffraction peaks of 锐钛矿相 and 金红石相. it can thus be said that the phase composition of a pure TiO2 sample prepared at 450 degree C is composed of both 锐钛矿相 and 金红石相. from the x-ray diffraction pattern of the N-doped TiO2 sample in the figure, three strong diffraction peaks can be found at 2θ locations of (27.5°、36.1° and 54.4°) which are corresponding to the peak locations of 金红石型. one relative weak diffraction peak can also be found at 2θ=25.4 which is corresponding to the peak location of 锐钛矿相. we can conclude based on the peak counts that the main crystal phase in a N-doped TiO2 sample is 金红石型. similarly, for the S-doped SiO2 sample, three strong peaks can be found at 2θ locations of (25.4°、37.8° and 48.1°) which are corresponding to peak locations of 锐钛矿相. three weak peaks can be found at 2θ locations of (27.5°、36.1°、54.4°) which are corresponding to the peak locations of 金红石型. compared peak counts between strong and weak peaks, it can be concluded that percentage of 金红石型 is less that that of 锐钛矿相 in the sample. also from the x-ray diffraction pattern of the N-S co-doped sample in the figure, two strong peaks are found at 2θ locations of (25.4°、48.1°) which are corresponding to the peak locations of 锐钛矿相. three weak peaks can be found at 2θ locations of (27.5°、36.1° and 54.4°) which are corresponding to the peak locations of 金红石型 this suggests that the 锐钛矿相 is dominated in the sample. in addition, its diffraction peaks are narrower than correspond peaks of the S-doped sample. this suggests better crystallization in the N-S co-doped sample than that of the S-doped sample. |
2楼2009-09-24 05:49:03
hi, dude, are you looking for somebody to translate your whole paper
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
风雨182(金币+30,VIP+0):thank u so much! i indeed look for such a person! 9-24 10:37
风雨182(金币+30,VIP+0):thank u so much! i indeed look for such a person! 9-24 10:37
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or thesis into english? LOL. from the content, it seems that you are working on TiO2. anyway, you paper needs to be reorganized instead of its present version, especially this part on this window. there are too much redundant words and never mentioned your evaluation criterion for the conclusion. good luck. |
3楼2009-09-24 06:10:33
