Measurement of thermal strain and total polarization estimation of lead zirconate titanate–lead zinc niobate ceramics

Abstract

Thermal expansion properties have been measured for the ceramic lead zirconate titanate-lead zinc niobate [(1 -x)PZT-(x)PZN] in the temperature range of -100 to ?450°C. For all ceramics examined, the deviations from the straight line below Burns temperature were observed. The dynamic polarization fluctuations in their relaxor compositions are believed to play a role in this deviation. Burns temperature was determined and the local polarization (P d ) was calculated from the thermal expansion data. Various aspects of understanding the polarization behavior and other effects in this ferroelectric system were examined and discussed.

Sintering‐driven effects on the band gap of (Pb,La)(Ti,Ni)O3 photovoltaic ceramics

“…In Figure 3A, it is noticed that the sample sintered at the lowest temperature (1100°C) does not reveal a well‐defined and abrupt/sharp minimum in the strain curve in the temperature region where the dielectric permittivity presents a peak. Indeed, the strain curve presents a broad maximum, a typical shape found for diffuse phase transition in relaxor‐like ferroelectrics 31,32 . However, by increasing the sintering temperature, a more abrupt minimum in the strain curves is noticed.…”

“…Indeed, the strain curve presents a broad maximum, a typical shape found for diffuse phase transition in relaxor-like ferroelectrics. 31,32 However, by increasing the sintering temperature, a more abrupt minimum in the strain curves is noticed. For the sample sintered at 1250°C a clear minimum in the strain curve is seen at around 160°C (Figure 3B), characteristic of a more displacive FE-PE phase-transition.…”