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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Electron microscopy and Interatomic distances of miller planes [duplicate]
I am studying Transmission Electron Microscopy (TEM), and have been seeing in articles TEM images of different materials typically come accompanied by these diffraction patterns, caused by the ...
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How does the diffraction pattern of a 2-dimensional grating/lattice relate to the reciprocal lattice?
I am trying to understand the relationship between the diffraction pattern produced when shining light onto a 2D lattice and the reciprocal lattice of the direct lattice in question.
So suppose we ...
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How to compare XRD data from literature?
I'm a grad student. Trying to do a literature review this summer. My advisor is telling me to gather XRD data of my samples for my research, and I have. Unfortunately, I have no idea how to compare it/...
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How are 3 Principle Sections possible in a crystal even when there is only one optical axis and all must contain it?
While studying polarization in calcite crystals, I came across that there are 3 possible principle sections in the rhombohedral crystal. But the conditions are that each section must be perpendicular ...
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Are there multiple d-spacings due to a single diffraction plane in XRD?
The Bragg Law is
$$n \lambda=2d \sin(\theta) $$
Therefore, you can find the d-spacing of a given diffraction plane if you know the wavelength and angle by:
$$ d = \frac{n \lambda}{2 \sin \theta}$$
But ...
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How to find Euler angles for orientation of Single crystals with respect to Lab Frame?
I have a monoclinic C2 space group single crystal sample glued to a tenon plate. I know the surface normal direction and the edge plan of the crystal. Also, I know the XY plane of the tenon plate. How ...
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Small-Angle X-Ray Scattering of Bulk Polymers
Does anyone have any recommendations on how to get useful information from SAXS of polymers when the system is not dilute?
This is the type of data we're working with:
My understanding is that since ...
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2D primitive unit cells
The answer given says that 2 & 3 are primitive unit cells.How can a hexagon be a primitive unit cell.Can someone explain?
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Generating high symmetry unit cell from lower symmetry primitive cell
I'm trying to create a workflow where one step of the process is taking in a primitive cell of a crystal structure and produce a cell that has the highest possible symmetry (conventinal cell) ...
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Understanding Wyckoff Position of Apatite group
I was learning about Wyckoff position, and one of the simplest example was of $ZrO_{2}$. For Zr and O, the Wyckoff positions are 4a and 8c and belongs to space group Fm-3m. Now from the Wyckoff ...
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Finding the Bremsstrahlung in diffraction patterns of NaCl
I recently got the chance to measure the diffraction pattern of a NaCl crystal using the Bragg-Brentano method. I can see the peaks caused by the characteristic lines of the used X-ray tube (in this ...
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Unique lattice constant using X-ray diffraction
I recently learned about X-diffraction methods to analyse crystal lattices. One important law in this is the Bragg condition
$$\lambda = 2d\sin(\theta).$$
I understand that $d$ is the distance between ...
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What's the difference between X-ray crystallography and X-ray spectroscopy?
From my understanding, further evidence for the structures of molecules can be obtained from single crystal X-ray crystallography which involved irradiating a crystal with X-rays and looking at the ...
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Physical meaning of Laue's condition for diffraction from crystals
The Laue's condition for diffraction is that scattering vector is equal to reciprocal lattice vectors $\mathbf{G}$. But how can a 'particular vector' equal a set of vectors? The reciprocal lattice ...
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How to enumerate all Miller indices in the unit cell?
Taking the unit cell of $\rm NaCl$ as an example, I want to compute the XRD pattern of its crystal structure. One step is to enumerate all miller indices within a limited sphere as follows:
$$\frac{1}{...
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