Can anyone have idea how to select lambda value in XRD command of lammps, default value is 1.54 for copper ,so is it applicable to all system??
Lambda is the wavelength of incident radiation, and its value will determine the position of the peaks in the resulting diffractogram. You should chose the value that was used to record the experimental diffractogram. A rotating Cu anode will produce the wavelength you mentioned, but a synchrotron source will produce a tunable wavelength via a monochromator (among others).
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okay , thank you for your information