I synthesized Mg0.5Zn0.5Fe2O4 ferrite at different calcination temperatures from 600 to 1000 degrees Celsius. I observed a prominent peak at 2θ = 35.5° up to 900 degrees Celsius, but this peak disappeared at 1000 degrees Celsius. Why?
At 1000 degrees, some possibilities can be there, but that can be further confirmed by other characterizations. i) At 1000 degrees, grain growth can lead to the merging of crystallite, and, as a result, the peak will disappear. ii) The phase transformation can happen, such as to magnesium ferrite, etc. iii) The cation redistribution can also take place, resulting in peak position changes. So such possibilities can be the reason for the disappearance of the peak, which can further be confirmed by spectroscopic characterizations such as XRD, SEM, TEM, and so on.
After the peak disappears, does the material have the same Crystalline phase?
In other words, if it was tetragonal. Does it remain tetragonal after the peak disappears?
Also, you can make Rietveld refinement to trace the change in the sample crystal structure
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