Abstract
Dense K0.5Bi0.5TiO3 (KBT) lead-free ceramics were prepared by conventional solid reaction route. Their temperature behavior (up to 600°C) was investigated by X-ray diffraction, DSC, dielectric spectroscopy and electric field-polarization technique. The first temperature dependent Raman scattering studies were also performed. X-ray and Raman scattering results show that samples exhibit a single perovskite structure with cubic symmetry at temperatures higher than approximately 400°C and with coexistence of the cubic and tetragonal phases below this temperature. Two structural phase transitions between tetragonal phases in temperature range 200–225°C and between tetragonal and cubic ones near 400°C are observed. The content of the tetragonal phase increases with decreasing temperature and at room temperature it reaches more than 70%. Temperature- dependent P-E loops and pyroelectric data revealed a polar behavior in KBT up to about 400°C, which means that the intermediate phase (∼270–380°C) is rather ferroelectric than antiferroelectric.
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