I doped Gd instead of Nd in NdFeB-based alloys. XRD data shows the variation in c/a ratios of all samples. What can be the possible reasons for that?
Dear Muhammad Asim
please read and take help from the following articles:
Article On the evolving nature of c/a ratio in a hexagonal close-pac...
Article Influences of Ga Doping on Crystal Structure and Polarimetri...
Dear Muhammad Asim,
The change in c/a ratio is indicative of the lattice compression or elongation. generally, smaller ion tends to compress the lattice and vice versa. Resulting in difference in lattice constants and therefore variation in c/a ratio. Changes in c/a ratio are also reflected in cell volume. Crystallographic calculations from XRD and Rietveld refinement (if possible) will give you a better idea.
Good luck!
I recommend you bot Touseef Ahmad Para and Pervaiz Ahmad for the valuable replies.
Hi Muhammad Asim
There will be a change in the c/a ratio when doping is done to a material. The smaller ions get packed into the lattice and may or may not change the unit cell structure. You can detect this phenomenon used XRD and Williamson-Hall (W-H) plots. The W-H plot is an extended work of the XRD analysis data which will give the idea about stress, strain, stacking fault; dislocation density, etc. of the material. Moreover, the synthesis process that is used for doping has an important role also. If the preparation process is not self-sustained, the reacting solution is not in homogeneous condition the doping product may have some disabilities. To overcome this solution-combustion method is a better option which is simple equipment, time and energy-consuming, and molecular level mixing, and also the product composition can be tuned.
You may look at these for W-H plot as well as the preparation method
org/10.1016/j.jes.2019.09.004 and ACS Omega 2019, 4, 9686-9696.
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