Bond charges form a "crystal" with a fcc lattice with 4 "atoms" per unit cell. Bond charges in covalent solid origin : (1/8,1/8,1/8). Sbond-charge(hkl) = Sfcc(hkl)[1+exp(i /2)(h+k)+exp(i /2)(k+l)+exp(i /2)(h+l)]. For h=k=l=2: Sbond-charge(222)=Sfcc(222)[1+3exp(i /2)4]=4Sfcc(222) non …

如图 3所示的 XRD 分析，在拉伸试验前后的样品中检测到 fcc 和 hcp 相。 fcc 和 hcp 相的特征衍射峰的相对强度在拉伸试验后发生变化，表明在塑性变形过程中发生了从 fcc 到 hcp 的相变。

For each of the Bravais lattices, selection rules tell us which planes have coherent scattering and which do not: Example: Use the following XRD spectrum to determine the element that was investigated. It is either BCC or FCC. Copper Kα radiation was used, which has a wavelength of 1.54 Angstroms.

2022年11月24日 · The most direct difference between FCC and BCC crystals is in the atomic arrangements. The face-centered cubic structure has an atom at all 8 corner positions, and at the center of all 6 faces. The body-centered cubic structure has an atom at all 8 corner positions, and another one at the center of the cube.

2014年6月11日 · I would suggest you to go through any book (Materials Science and Engg. by Raghavan) to find the basic procedure to compute the type of crystal structure from an experimentally observed XRD...

2022年8月28日 · Described simply, single-crystal X-ray diffraction (XRD) is a technique in which a crystal of a sample under study is bombarded with an X-ray beam from many different angles, and the resulting diffraction patterns are measured and recorded.

BCC，FCC相的消光规律不一样，发生衍射的晶面也不一样，衍射峰的强度和位置都有所差别，文献中BCC、FCC相的衍射图谱中发生衍射的衍射角的位置都是大致固定出现在那几个角度的的，只是强度有时候会有所差异，你看文献里总结一下就知道了，这样就可以很容易把他们标出来了，当然前提是形成了BCC、FCC固溶体，标定现在一般都是用标定软件，比如jade5等。 XRD检测做完之后，得到的是衍射图谱，要确定结构还得进行标定啊。 BCC，FCC相的消光规律不一样， …

Let's say you suspect the material is cubic, how do I find if it's simple cubic or BCC or FCC? I've googled and all my textbooks just state that xrd is really nifty for determining crystal structure but no further information is presented.

最近看见文献里面通过xrd图谱分析得到物相结构是bcc或者是hcp结构，我记得jade里面默认模型是cubic有怎么可以通过这个xrd得到晶胞结构呢？ 望求甚解，希望各位朋友多多回答，一起交流。

For XRD a crystal is defined as perfect 3-D order. This corresponds to the strictest definition of a crystal. For a semi-crystalline polymer, for instance, 100% crystallinity is never obtained by this definition since there are large interfacial regions where some degree of disorder is present.