When I was reading "Handbook of Advanced Dielectric, Piezoelectric and Ferroelectric Materials: Synthesis, Properties and Applications", I saw that some graphs about PMN-PT. d33, Pr and dielectric constant decreases as the grain size decreases. What is the reason of this?
https://www.sciencedirect.com/science/article/abs/pii/S0955221913005499
Dear Aykut,
I'm not an expert on your topic but typically grain boundaries behave differently from the bulk.
Good luck
Aykut,
Domian wall motion is strongly influenced by grain size of piezoelectric ceramics. Within smaller grain the domain density may be higher and their motion is limited which directly reduces the saturation polarization as well as piezoelectric coefficient.
Further optimum grain size to obtain better properties depends on the composition of piezo-ceramics.
Grain boundaries and domain walls all contribute to the piezo properties of the ceramic (or single crystal). Sometimes they affect the final performance in the same way. The ability to prevent domains from moving acts as hindrance to high performance. In some cases, smaller grains (more grain boundaries per volume) do precisely that. Please refer to www.innoviamaterials.com for more information.
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