Tuning the Ferroelectric and Piezoelectric Properties of 0.91Pb(Zn1/3Nb2/3)O3-0.09PbTiO3 Single Crystals and Lead Zirconate Titanate Ceramics by Doping Hydrogen

Systematically experimental investigations were conducted on H-doped 0.91Pb(Zn1/3Nb2/3)O3-0.09PbTiO3 (PZNT) single crystals and lead zirconate titanate (PZT) ceramics. The experimental results show that doping hydrogen with appropriate content advances the ferroelectric and piezoelectric properties effectively. For example, when trapped hydrogen concentration was Ct = 1.7 wppm in the H-doped PZNT single crystals, the remanent polarization Pr and piezoelectric constant d33 increased by 80% and 41.7% in comparison with the H-free samples, respectively, to 28.8 μC/cm2 and 391 pC/N. However, high hydrogen concentration damages the ferroelectric and piezoelectric properties. The remanent polarization Pr and piezoelectric constant d33 of the H-doped PZNT single crystals decreased to 0 μC/cm2 and 24 pC/N, respectively, when Ct = 3.1 wppm. The H-doped PZT ceramics exhibited the same behavior, where the values of Pr and d33 increased respectively by 45.3% and 27.3% to 48.1 μC/cm2 and 420 pC/N, when Ct = 1.1 wppm, ...