Highly orientated Bi4Ti3O12 piezoceramics prepared by pressureless sintering
Highly orientated Bi4Ti3O12 piezoceramics prepared by pressureless sintering
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DOI：
10.1016/j.jeurceramsoc.2020.09.039
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发表时间：
2021-02
影响因子：
5.7
通讯作者：
Dong‐Fang Jiang;Zhiyong Zhou;R. Liang;Xianlin Dong
中科院分区：
文献类型：
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作者：
Dong‐Fang Jiang;Zhiyong Zhou;R. Liang;Xianlin Dong
钛酸铋（Bi_4Ti_3O_（12））具有很高的居里温度（TC ≥ 675 °C），在400 °C以上具有很大的应用潜力。但其压电常数d33较低（< 8 pC/N），限制了其在高温下的实际应用。本文采用熔盐法和无压烧结相结合的方法制备了具有高晶粒取向度（f= 0.83）、大d33（29.7 pC/N）和较高TC（628 °C）的织构Bi 4 Ti 3 O 12压电陶瓷。这表明，该组合是一种低成本，有效和简单的方法来获得高取向的BIT陶瓷具有优异的性能。深入研究了晶粒取向的机理和来源，提出了成型过程中的压缩压力是晶粒取向的主要驱动力，这对指导新型高取向材料的设计和制备具有重要意义。
Bismuth titanate (Bi4Ti3O12) has great potential for applications over 400 °C owning to its great Curie temperature (TC∼ 675 °C). But the relatively low piezoelectric constant d33(< 8 pC/N) has restricted the practical high-temperature application. In this work, a new combination of the molten salt method and pressureless sintering was used to prepare textured Bi4Ti3O12piezoceramics with a high degree of grain orientation (f= 0.83), large d33(29.7 pC/N) with a comparatively high TC(628 °C). These demonstrate that the combination is a low cost, effective and simple way to achieve highly orientated BIT ceramics with excellent performance. The mechanism and origin of the grain orientation have been deeply investigated, and the compression pressure during the molding process is proposed to be the main driving force for grain orientation, which would be very helpful for guiding the design and fabrication of novel highly orientated materials.