Abstract
Phase transitions in BaTiO 3 single crystals were investigated by "mK-stabilized cell" having fine temperature stability. It enables us to make various kind of measurements not only on heating and but also on cooling at a very small rate of temperature change. Heat flow measurements have revealed that both the uppermost and the lowermost phase transitions are accompanied by complicated thermal anomaly, whereas the intermediate temperature transition shows a single peak. Taking into account, these results together with those of dielectric constant, displacement current and X-ray diffraction measurements, we suggest the paraelectric-ferroelectric transition in BaTiO 3 takes place in multi-step, leading to a complicated structure in the lower temperature region.
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