I did Scanning electron microscopy of powder sample, of hydroxyapatite sample where its calcination temperature was 1100 degree for 12 hours. I see a majority of hexagonal shape morphology and some not. What is the reason for this hexagonal shape grain formation and why is it temperature dependent.
Maybe mentioning the compound you are working with could improve the chance for a discussion.
Maybe showing a representative image could improve the chance for a discussion.
from Wikipedia:
Hydroxyapatite crystallizes in the hexagonal crystal system.
Comparison of techniques for the synthesis of hydroxyapatite
https://www.icevirtuallibrary.com/doi/abs/10.1680/bbn.14.00010
Synthesis method of hydroxyapatite: A review
https://www.sciencedirect.com/science/article/abs/pii/S2214785320341389
Those shapes may not be characteristic of the crystal habitat but rather of multiple grains growing together until they run into neighboring grains. Many times that will lead to hexagonal boundaries, but not always. With time or temperature, some of those grains will grow at the expense of others.
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