Dear Dr. Hanggara Sudrajat ,
The doped of any metal on semiconductor leads to small red shift toward more 2 theta. This behavior will produce a less crystal size after doped metal on semiconductor, this process depends on the interaction between doped metal and the main metal in semiconductor, hence, if the doped metal has a less ionic radii compared with the ionic radii of the main metal in semiconductor, that will cause a good interaction and less crystal size ( i.e the size shifts to nano-size mostly.)
sincerely....
Dr. Luma
Doping in crystallite structures is well observed from XRD analysis via shift in peaks of diffraction angle if the dopants possess different radii in same coordination type than the metal to be substituted. In your case as there are two dopants so i suggest first to observe change via individually doping La and Cr in NaTaO3 as it would ease in understanding the observed effect of codoping.
Be careful with low range of 2theta. Remember that the accuracy (error) of 2theta - is strongly depends on the angle. Thus, observation of a shift at angles > 50-60 2theta is more accurate and right. Just compare, if any shift is found in parallel to low angle-distortion. Please, see the attachment.
Mrs. Luma M. Ahmed,
A "red shift" is a non-relevant term in XRD - it is about the spectroscopy.
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