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xiaofeng5838

木虫 (正式写手)

[求助] 晶粒大小咋么算?

不知道怎么算晶粒大小,恳求帮我算下!!!谢谢
最好能有具体步骤,谢谢啦
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updayday

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【答案】应助回帖

主要是用Scherer 公式,以钛酸锂为例
The average The average Li4Ti5O12 crystallite size was calculated from the most intense diffraction peak (111) using the Scherer equation
                d= Kλ⁄((β cos⁡θ))                (1)

K is the shape factor (0.9 was used), λ is the X-ray wavelength, θ is the Bragg angle and β is the difference between the full width at half maximum (FWHM) of peak (111) and the instrumental broadening. The FWHM of the (111) Li4Ti5O12 peak was obtained through least-square fitting of the (111) peak by a Lorentz function. A LaB6 standard was used to correct for instrumental broadening.

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女博士
2楼2013-02-05 00:22:43
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xiaofeng5838

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2楼: Originally posted by updayday at 2013-02-05 00:22:43
主要是用Scherer 公式,以钛酸锂为例
The average The average Li4Ti5O12 crystallite size was calculated from the most intense diffraction peak (111) using the Scherer equation
                d= Kλ⁄((β cos& ...

谢谢
3楼2013-02-06 09:37:17
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休眠火山

禁虫 (知名作家)

XRD&SEM qq2978260443


【答案】应助回帖

★ ★ ★
xiaofeng5838: 金币+3, ★有帮助 2013-02-27 19:58:08
用谢勒方程计算。
1.要精确的扫描,得到一张高质量的衍射普。
2.测量该相的衍射主强峰的FWHM
3.测量仪器宽化因子
4.代入谢勒方程计算。
大约步骤如此。
具体看《x射线衍射技术及设备》丘利,胡玉和编著。冶金工业出版社
4楼2013-02-27 19:17:55
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