Bi:SrTiO3:: A quantum ferroelectric and a relaxor

Quantum ferroelectric and ferroelectric relaxer behavior has been found in (Sr1-1.5xBix)TiO3. For x less than or equal to 0.0267, the quantum ferroelectric relationship T-epsilon m proportional to (x - x(c))(1/2) holds with x(c) approximate to 0.0005, and obvious hysteresis loops were observed. The polarization relaxation shows critical slowing down. At high Bi concentration, a crossover from quantum ferroelectric to relaxer behavior occurred. The coexistence of ferroelectric and relaxer behavior in Bi:SrTiO3 was attributed to a ferroelectric domain state induced by random fields.