Dear Thamarai,

if you are working with TEM-SAED a ring pattern can give you several informations. In some way, this can be seen as an analogous to powder x-ray diffraction, in which the differences is in the use of electrons instead of x-rays.

First thing first, if you measure rings radius you can calculate d(hkl) spacing within the crystals of your sample. Obviously, when you face  ring patterns means that you have one phase or different phases in several orientations which generate your ring pattern. So, what I can suggest is to combine your patterns with EDS chemical analysis.

What you can also try, is to tilt your specimen, in this way you can understand if your sample is a random polycrystal or textured. Indeed, you can obtain some information on the grain size which is inversely dependent to the broadening of diffraction spots. 

Basically, continuous rings (instead of discrete spots rings) means that your grains are finer.

Dear Thamarai,

if you are working with TEM-SAED a ring pattern can give you several informations. In some way, this can be seen as an analogous to powder x-ray diffraction, in which the differences is in the use of electrons instead of x-rays.

First thing first, if you measure rings radius you can calculate d(hkl) spacing within the crystals of your sample. Obviously, when you face  ring patterns means that you have one phase or different phases in several orientations which generate your ring pattern. So, what I can suggest is to combine your patterns with EDS chemical analysis.

What you can also try, is to tilt your specimen, in this way you can understand if your sample is a random polycrystal or textured. Indeed, you can obtain some information on the grain size which is inversely dependent to the broadening of diffraction spots. 

Basically, continuous rings (instead of discrete spots rings) means that your grains are finer.

Hi,

check the paper in attachment for some leads. Both SAED and XRD signals originate from the crystal structure of investigated material, so they can be related although XRD is obtained by refraction and SAED by scattering... I think you can find the equations relating them in the paper provided. Good luck!

Check following attachment.

You may find the following article helpful as it correlates both the SAED and XRD data in detail for anatase and rutile phases of TiO2 nanoparticles.

https://www.researchgate.net/publication/255748536_Hydrothermal_synthesis_of_titanium_dioxide_nanoparticles_studied_employing_in_situ_energy_dispersive_X-ray_diffraction

Article Hydrothermal synthesis of titanium dioxide nanoparticles stu...

For easy and effective SAED calculations you can explore this link and also select XRD d value calculations from this website and compare them easily

http://www.instanano.com/characterization/d-value-calculation/saed-d-value-calculation/

For easy and effective SAED calculations you can explore this link,

http://www.instanano.com/characterization/d-value-calculation/saed-d-value-calculation/