The interplay of phases, structural disorder and dielectric behavior in Al doped BiFeO₃-BaTiO₃ ceramics

5^th International Conference and Expo on Ceramics and Composite Materials

June 03-04, 2019 | London, UK

Jiangguli Peng, Jiangtao Zeng, Liaoying Zheng, Guorong Li, Nader Yaacoub, Mohamed Tabellout, Alain Gibaud and Abdelhadi Kassiba

Shanghai Institute of Ceramics-CAS China
University of Chinese Academy of Sciences, China
Institute of Molecules at Materials in Le Mans, France

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

Al doped BiFeO3-BaTiO3 (BFA-BT) systems with a defined composition were prepared by solid-state method. The enhanced spontaneous and remnant polarization were achieved in BiFe0.970Al0.030-BaTiO3 with 36.8 μC/ cm2, 31.5 μC/cm2 respectively. From SEM and XRD analyses, the high-density of the ceramics and the high lattice parameters ratio ct / at traducing large distortions of the rhombohedral phase play a dominant role in the enhanced piezoelectric properties. The high polarization and large strain were achieved in the BF0.970A0.030-BT system. 57Fe Mössbauer spectra revealed the large disorder of Fe3+ at B sites preferentially occupied by more Al3+ doping ions, forming the diffusive phase transition for dielectric behaviors in samples. Grain and grain-boundary effects were pointed out from the dielectric modulus and a related thermal evolution. AC capacitances indicated two relaxation processes marked by the grains and interfaces involved in the polycrystalline ceramics for highly doped systems. The work will be significant to illuminate the interplay between structures and properties in ferroelectric materials.

Biography :

E-mail: pjguli@student.sic.ac.cn