Study of true intrinsic polarization in high performance perovskite piezoelectric ceramics

The ferroelectric perovskite ceramics are extensively used in various industrial and commercial devices. Pure and doped binary 0.64PbMg1/3Nb2/3O3-0.36PbTiO3 and ternary 0.57BF-0.31PMN-0.12PT  PMN-PT ceramic systems have... [ view full abstract ]

The ferroelectric perovskite ceramics are extensively used in various industrial and commercial devices. Pure and doped binary 0.64PbMg_1/3Nb_2/3O₃-0.36PbTiO₃ and ternary 0.57BF-0.31PMN-0.12PT  PMN-PT ceramic systems have been synthesized near MPB by solid state reaction method and various structural, dielectric, piezoelectric, pyroelectric and ferroelectric studies were carried out. A high value of spontaneous polarization (~41 μC/cm²), transition temperature (Tc ~ 285 °C), piezoelectric charge coefficient (d₃₃ ~ 250 pm/V) and pyroelectric coefficient (p ∼ 3300 μCm^-2 oC^-1)  were achieved which did not degrade even after 10⁷ cycles. The conventionally reported above values of polarization actually contains contributions from both switchable and non-switchable components. We have performed  “remanent hysteresis task” and “positive-up-negative-down technique” and “resistive leakage” to extract the true (intrinsic)  polarization which is usable for memory device applications.

In addition, our recent results in respect of lead free Na_0.52K_0.44Li_0.04Nb_0.84Ta_0.10Sb_0.06O₃ (NKLNTS) ceramic will also be presented. A high value of transition temperature (T_m~305 ^oC) , dielectric permittivity (~2110), spontaneous polarization (~12.37 μC/cm² ), piezoelectric charge coefficient (d₃₃ ~ 754 pm/V) and pyroelectric coefficient (p ∼ 1921.9 μCm^-2 oC^-1) was achieved  with negligible contribution of ‘non-switchable polarization’. These lead free NKLNTS ceramic was found to be superior to many lead based piezoceramics and are used for piezoelectric energy harvesting.

 References

1. Study of true-remanent polarization using remanent hysteresis task and resistive leakage analysis in ferroelectric 0.64Pb(Mg_1/3Nb_2/3)O₃-0.36PbTiO₃ ceramics, Solid State Communications 271 (2018) 11–15
2. Ferro-/pyroelectric response of 0.57BF-0.31PMN-0.12PT ternary ceramic far away from morphotropic phase boundaries, Ceramics International(2017) doi: 10.1016/j.ceramint.2017.09.058
3. Giant piezoelectric behavior in relaxor ferroelectric environment friendly Na_0.52 K_0.44 Li_0.04 Nb_0.84 Ta_0.10 Sb_0.06 O₃ ceramics for high temperature applications, Journal of Materials Science: Materials in Electronics (2018, In Press)
4. Achieving high piezoelectricity and fatigue free hysteresis in lead free relaxor ferroelectric ceramic 0.94[Na_0.5K_0.5NbO₃]-0.06LiSbO₃, Materials Chemistry and Physics 159 (2015)107.