# Questions tagged [x-ray-crystallography]

X-ray crystallography encompasses the structural characterization of crystalline materials by means of X-rays. This is done most commonly by X-ray diffraction, which can be applied to monocrystalline materials or heterostructures, as well as to polycrystalline materials, where the later is referred to as powder X-ray diffraction.

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### Diffraction Elastic Constants

I'm currently trying to calculate the diffraction elastic constants for hcp material by the method of Voigt and Reuss, the Voigt method is quite straight forward, but with the Reuss method i have ...
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### Help in Rietveld refinement using xpert highscore

I work for a space and defence startup and we have been creating novel catalytic materials and performing XRD of the said materials. I have started using xpert highscore to perform Rietveld refinement ...
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### What is the catch behind the simple expression and explanation of Bragg's Law?

Consider how the topic of scattering by periodic crystal structures is covered in most books: Start by treating the crystal structure as a periodic potential and use Fermi's Golden Rule to show that ...
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### Miller index and intersects

How intersects between a plane and unit cell are $a/h, b/k, c/l$? Let me say miller indices of the give plane are (hkl) and lattice transitional vectors are (a,0,0), (0,b,0), (0,0,c). As you may know, ...
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### What kind of material could be used as a diffraction grating for Xrays?

I'm trying to design a home-built X-ray fluorescence spectrometer with the following layout: Building the X-ray tube is relatively simple, however I'm uncertain what material could be used as the '...
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### Assigning Miller indices to Bragg diffraction angles

I am a bit confused with the procedure to index diffraction peaks obtained in X-ray crystallography using the powder method. The incident wavelength $\lambda$ is known and the lattice constant $a$ is ...
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### Are crystal lattice and crystal structure the same thing?

Rhetorical question. A lattice is an infinite array of geometrical points in the space where each point has identical surroundings to all others. Hence a lattice is an abstract mathematical concept. ...
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1 vote
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### Determining the structure of a crystal from its diffraction pattern

I am given the Laue interference patterns (in reciprocal space) of two crystal structures, being either simple cubic (sc), body-centered cubic (bcc) or face-centered cubic (fcc), with the task to link ...
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1 vote
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### Can raman be used to know the number of layers other than graphene?

I came across some paper where the number of layers of Graphene have been investigated by Raman spectroscopy. I found simulation websites https://instanano.com/characterization/calculator/raman/...
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### Reciprocal lattice points connection to multiple slit experiment

Why does the X-ray diffraction of 1 lattice plane result only in a single reciprocal lattice point (Is this somehow related to the fact that the lattice plane is a 2D diffraction grating)? Does this ...
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### Why do you consider only nearest neighbours for quasicrystals when projecting from superspace?

I'm doing some self studying on quasicrystals and I'm trying to understand the concept of superspace. From what I understand is that quasicrystals often (always?) can be constructed by considering a ...
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### How can Raman Spectra be utilised to know the crystal structure?

If Raman spectroscopy is using a visible or infrared source to excite phonons in the crystal, that is much different from XRD which is using higher energy X-rays scattered from the crystal planes. How ...
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### Why does 2D crystalline lattice of Graphene overlap with its reciprocal lattice?

Can someone please explain why the 2D electron-diffraction pattern of graphene coincidentally overlaps with its reciprocal lattice? I want to understand/know the reason behind this coincidence in the ...
1 vote
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### Bragg Diffraction with Lasers?

I've run a lot of laser diffraction experiments with nothing more than a quality laser pen, some rasor blades, a human hair and a small hole in a Christmas card as demonstrations for laymen but I'm ...
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### Minimum distance for two parallel beam to interfere effectively

Following is an illustration of two parallel monochromatic beams interfering in Bragg's law experiment. For these two rays to interfere, what is the minimum distance OF required? I understand that the ...
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### What is the difference between the X-ray diffraction and neutron diffraction?

In the Kittel book, I have read that the ionic form of $\text{KCl}$ contains $\text{K}^+$ and $\text{Cl}^-$, having equal number of electrons. Looking at the statement in figure that while doing the ...
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### The wavelength of the probing wave and the interatomic distance relation

I have often seen this statement in different texts that the wavelength of the probing wave should nearly be of the same order as the interatomic distance of the structure to be probed for the best ...
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### Reciprocal Lattice

I am just getting started with solid state physics. To get the information about the crystal lattice, about it's structure we use the method of X-ray diffraction. Now as X-ray diffraction is not the ...
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