Multilayer BiFeO 3 /PbTiO 3 Multiferroic Ceramic Composites Prepared by Tape Casting
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Multilayer BiFeO3/PbTiO3 Multiferroic Ceramic Composites Prepared by Tape Casting Guoxi Jin, Jianguo Chen and Jinrong Cheng* School of Materials Science and Engineering, Shanghai University, 200444, P.R. China * corresponding author: [email protected] ABSTRACT The BiFeO3 (BFO) / PbTiO3 (PT) multiferroic ceramic composites with multilayered structure were prepared from orderly laminated BFO and PT tapes by tape casting method. The dielectric constant İr, loss tanį, remnant polarization Pr and field-induced strain of BFO/PT ceramic composites were 140 (1 kHz), 5% (1 kHz), 12 μC/cm2 (at 80 kV/cm) and 0.06% (at 80 kV/cm) respectively, which were comparable to those pure BFO ceramics and BFO-based solid solutions INTRODUCTION In recent years, multiferroic materials, which exhibit simultaneous ferroelectric and ferromagnetic behaviors, have been receiving considerable attention due to their interesting magnetoelectric effects promised for potential multifunctional application in memories, transducers, sensors, and switching devices, etc. [1–4]. Among the few room-temperature single-phase multiferroic materials reported, BiFeO3 (BFO) is a promising candidate due to its high Curie (Tc 1103 K) and Neel (TN 643 K) temperatures [5-6]. However, its low resistivity and weak ferromagnetic property at room temperature makes it difficult to be used in practical applications [7]. Consequently, a variety of improvements including formation of solid solution (with PbTiO3, BaTiO3 or any other ABO3, etc.) and rare-earth elements doping has been widely and deeply researched to ameliorate those defects above [8-10]. Our previous work showed that introducing PbTiO3 into BiFeO3 to form BFPT solid solution enhanced insulating and multiferroic properties. And with the La, Mn, Ga doping, the coercive field, dielectric constant and loss of BFPT solid solution can be sequentially decreased [11-14]. However, there is less work on the BFO-based composites such as multilayered structure, which is expected to improve the ferroelectric and piezoelectric properties, has been employed to study the ferroelectric, piezoelectric and magnetic properties. Tape casting method is widely used to prepare multilayer structure materials with exact scale control. It owns the great advantage in forming large-area, thin and flat ceramic parts and excellent convenience in composites structure design. With the great progress in tape casting preparation on multiferroic ceramics [15], now the BFO-based composites with multilayered structure can be easily achieved. In the present work, PbTiO3 (PT) and BiFeO3 (BFO) tapes were obtained separately by optimized tape casting method based on our previous work. And then, these two kinds of ceramic tapes were laminated orderly to form multilayered composites instead of traditional solid solutions. Dielectric, ferroelectric and piezoelectric properties of BFO/PT composites with multilayered structure were studied.
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EXPERIMENT Analytical-grade powders of Bi2O3, TiO2, Fe2O3 and PbO were used as starting materials to synthetiz
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