Define polycrystalline. Are most materials polycrystalline or single crystals? What, if any, considerations should be taken...

Define polycrystalline. Are most materials polycrystalline or single crystals? What, if any, considerations should be taken when conducting XRD on single crystals?

Expert Solution

---->POLYCRYSTALLINE are solids that are made up of number of crystallites of different orientation and sizes. Polycrystalline consists of number of grains.

------>Most of the materials are polycrystalline that are made up of large number of single crystals.Also polycrystalline materials are stronger than single crystals because of the reason that when plastic deformation occurs in a grain, it will be constrained by its neighbors which may be less favorably oriented.

------->XRD experiments are generally carried out with single crystals or powdered samples.

*Single crystal XRD is the most commonly used for precise determination of a unit cell, including cell dimensions and positions of atoms within the lattice.Bond-lengths and angles are directly related to the atomic positions.

*Also for single crystal XRD ,the X-rays will be scattered only in specific directions which will lead to peaks of high intensity with a narrow width.But for polycrystalline (consists of so many crystals that are oriented in so many directions) he X-rays to be scattered among a wide range of 2-Theta instead of high intensity narrow width peaks.

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Amanda K answered 2 years ago

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