The Influence of the 'Heating–Cooling' Process Rate on the Temperature Hysteresis of Ferroelectric Capacitor Structures

The influence of the time mode of cooling, electric field and electrical conductivity on the thermal hysteresis loops in capacitor structures based on Ba0.55Sr0,45TiO3 (BST) ceramics with 12 wt.% magnesium orthotitanate Mg2TiO4 (BSTM) has been studied. The values of pyroelectric coefficients of the BSTM ceramics in the paraelectric phase were found to be between 2–8 · 10–4 C / (m2 ·K). The temperature hysteresis in the absence of an external electric field is caused by the pyroelectric effect. Different mechanisms responsible for the appearance of the thermal hysteresis are discussed.