[交流] 【求助】关于Bragg peak！！ 已有2人参与

求助各位能人。 小弟最近看到一篇文献是关于CeO2在玻璃体中的检测。 里面给了这么一个图 XRD patterns gave direct evidence of CeO2 nanocrystals in RTT glasses, whereas no diffraction peaks could be detected in non-RTT samples with less than 5 mol% Ce (cf. the 1% case in Figure 4（就是我上传的这张图）). Raman spectra cannot give directly the value of the CeO2 cluster dimensions, but need calibration through XRD or TEM analysis. By use of the full widths at half-height of the CeO2 X-ray diffraction peaks, analyzed through the Scherrer equation, the mean crystalline size was determined in the glasses containing 1, 2, 3, and 5 mol % Ce after RTT, obtaining values in the 15-20 nm range (Figure 5（上传的第二张图）).A calibration on well-crystallized CeO2 was taken into account. The error bars in Figure 5 correspond to deviations between results from different Bragg peaks in the CeO2 XRD pattern. In the case of the 5% sample before RTT, very broad peaks appeared corresponding to a crystal size of about 5 nm. 这里面说根据在CeO2的XRD中不同布拉格峰来确定的误差。首先对于布拉格峰小弟就不是很明白是什么东西。在网上查了一下也说得不清不楚的。第二，如果我要弄清楚这个误差到底是怎么计算的是不是还要去找CeO2在XRD里面的不同的布拉格峰，这个要怎么找？求教大师。 (Fig. 4) Fig. 5

回复此楼