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In Situ Di‑, Piezo‑, Ferroelectric Properties and Domain Configurations of Pb(Sc1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 Ferroelectric Crystals
journal contribution
posted on 2017-11-27, 00:00 authored by Zujian Wang, Chao He, Huimin Qiao, Dongfang Pang, Xiaoming Yang, Sangen Zhao, Xiuzhi Li, Ying Liu, Xifa LongRelaxor ferroelectric
crystals, such as Pb(Mg1/3Nb2/3)O3–PbTiO3 and Pb(Zn1/3Nb2/3)O3–PbTiO3, exhibit
high piezoelectric properties. However, they cannot meet the need
of high power transducers, due to their low phase transition temperatures
and low coercive fields. Thus, it is urgent to develop new-type ferroelectric
crystals. Here, a ternary solid solution of Pb(Sc1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 is a good candidate. By the
regulation of growth techniques and the control of raw compositions,
Pb(Sc1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 crystals
with different compositions are obtained, which present perovskite
phases without any trace of impurity. In situ investigations of di-,
piezo-, ferroelectric properties and the observation of domain configurations
are realized in Pb(Sc1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 crystals,
which exhibit large di-, ferro-, piezoelectric responses, typical
domain switching, high poled and thermal stabilities. At room temperature,
the maximum piezoelectric constant is found to be 1550 pC/N, with
the maximum peak to peak strain value of 0.57% and coercive field
of 4–6 kV/cm. The speckle-shaped nanodomains and butterfly
hysteresis loops represented by the variation of amplitudes further
indicate large piezoelectric responses of PSN–PMN–PT
crystals. Furthermore, the rhombohedral–tetragonal phase transition
temperature is more than 120 °C, indicating good thermal stabilities
with stable ferroelectricity and large piezoelectric response in a
wide temperature range.