Please enable JavaScript.
Coggle requires JavaScript to display documents.
REAL DIFFRACTION (Diffaction in true situation (Effect to the…
REAL DIFFRACTION
Diffaction in true situation
Crystal are not perfect
Incident rays
Not perfectly parallel
Non-monochromatic
Effect to the characterization
Effect of powder size
Constructive interference oocurs when path difference for the diffracted beams are multiple integral of the wavelength
Non-constructive interference occurs if the path difference between two rays diffracted by adjacent planes is lambda/4
Destructive inteference occurs the rays diffracted from the first and third planes has path difference = lambda/2
All together these form a destructive interference which the diffracted rays have minimum intensity
Leads to broadening of diffracted rays with non-zero intensity
Formula Scherrer=
Non-monochromatic beam effect
Real condition: The rays used do not fully monochromatic
It have Ka component which is overlapping with the continuous spectrum
Range of Ka component is about lambda equal nearest to 0.001 armstrong.
Non-perfect crystal effect
Real crystal have a type of non-perfect which known as mosaic structure
Mosaic structure is a type of substructure which show the single crystal schism
