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Dielectric properties and relaxor behavior of a new (1-x)BaTiO3–xBiAlO3 solid solution

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2 Author(s)
Yu, Huichun ; Department of Chemistry and 4D LABS, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada ; Ye, Zuo-Guang

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A new lead-free perovskite solid solution of (1-x)BaTiO3–xBiAlO3 (x=0.02, 0.05, 0.10, and 0.15) that exhibits ferroelectric properties and relaxor behavior has been synthesized by solid state reactions. X-ray diffraction patterns show a transformation from the tetragonal symmetry into a rhombohedral symmetry as a result of the substitutions of Bi3+ on the A site and Al3+ on the B site in the crystal lattice of BaTiO3. The temperature and frequency dependences of the dielectric constant indicate a crossover from a normal ferroelectric to relaxor behavior. The degree of deviation from the Curie–Weiss law is found to increase with the increasing amount of BiAlO3. The high-temperature slope of the dielectric peak for x=0.05, 0.1 and, 0.15 can be well described by a Lorenz-type relation. Typical relaxor behavior is observed for x=0.15 with the temperature of the dielectric peak Tm=360 K at 1 kHz, while ferroelectric hysteresis loop is displayed at room temperature. This suggests that the long-range polar order from the end member BaTiO3 persists and coexists with polar nanoregions induced by the chemical disorder following the coupled substitutions in the solid solution.

Published in:

Journal of Applied Physics  (Volume:103 ,  Issue: 3 )

Date of Publication:

Feb 2008

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