Quenching effects and mechanisms in bismuth-based perovskite ferroelectrics

Influence of temperature-induced A-site cation redistribution on the functional properties of A-site complex polar perovskite K1/2Bi1/2TiO3

“…This result suggests an increase in the stability range of the FE state in KBT due to quenching, a result that is consistent with other Bi-based perovskite oxide ceramics. 31 In addition, the thermal hysteresis in tand above the T F-R for Q 900 sample is signicantly higher, which is possibly related to increased presence of high-temperature active charged species. Nevertheless, the dielectric loss between roomtemperature and T F-R of Q 900 is similar to NC 900 KBT.…”

“…38 Although quenching has been found to increase the stability range of the field-induced ferroelectric state in different compositions, their underlying mechanism is not well-established. 31 Studies on the influence of rapid cooling/quenching on A-site complex KBT are lacking. The slow cooling at a rate of 0.1 K min −1 from 900 °C or annealing for 24 h at 1000 °C, which is 50 °C lower than the sintering temperature, were found to establish relaxor and ferroelectric state, respectively.…”

“…Several works have focused on stabilizing the ferroelectric state in Bibased lead-free relaxors. 31,32 For example, Muramatsu et al 33 reported an increase in T d by 50 °C in thermally quenched NBT, which has been attributed to the quenching-induced enhancement of lattice distortion and increased long-range ordering. An enhancement in T d aer rapid cooling to room temperature from temperatures ranging between 700 °C and 1100 °C was also reported for the relaxor Na 1/2 Bi 1/2 TiO 3 -BaTiO 3 and BiFeO 3 -BaTiO 3 .…”

“…An enhancement in T d aer rapid cooling to room temperature from temperatures ranging between 700 °C and 1100 °C was also reported for the relaxor Na 1/2 Bi 1/2 TiO 3 -BaTiO 3 and BiFeO 3 -BaTiO 3 . 31,[34][35][36][37] An increase in the defect concentration with quenching, typically understood to be oxygen vacancies, is also considered crucial in stabilizing the FE state. 34 Despite this, an oxygen tracer diffusion study of as-processed and quenched NBT did not reveal any signicant variation in oxygen vacancy concentration due to the quenching.…”

“…38 Although quenching has been found to increase the stability range of the eld-induced ferroelectric state in different compositions, their underlying mechanism is not well-established. 31 Studies on the inuence of rapid cooling/quenching on A-site complex KBT are lacking.…”