I am now working on lead free piezoelectric material with barium titanate (BaTiO3) based material. However, I faced problems while doing poling process. I used to pole my sample in pallet form with maximum 4kV DC current in 110 oC silicon oil bath for 30 minutes. Yet I am still got a low piezoelectric constant. My sample have small grain size in nano scale (average 500 nm). Was the size of the grain play a main role for the poling process? Thank you.
Maybe, you can try to lower the temperatute of the silicon oil bath because the temperature of poling process relates to the Curie temperature of piezoelectric materials
Hi,
The properties of piezoelectric material depend on the size of the grain. The quality of the polling process depends on the polling voltage per thickness of sample and the temperature of medium. Depending on the material I use the voltage in range from 2kV to 3kV per 1mm thickness (e.g. 4mm thickness -> ~10kV).
Good luck!
Maybe, you can try to lower the temperatute of the silicon oil bath because the temperature of poling process relates to the Curie temperature of piezoelectric materials
Dear,
Raimundas Lucinskis : Thank you for your advise. I already polished my sample +/- 1mm thickness of my pallet. Maybe I will decrease my temperature medium of the silicon oil bath.
Cheng-Che Tsai : Thank you for your advise. I will follow your advise later on. I knew the BTO Curie temperature was 120 oC. Thats the reason why I tried to do the poling process with 110 oC of silicon oil bath. My idea was to try the temperature near to the Tc. Maybe I should lower the temperature again.
Sunil Kumar : Thank you for your advise. I already done the cooling process under the applied field like the procedure that you advise. And I will cross-check the poling process via Resonance-Antiresonance method later on.
Thank you again :)
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