Department of Physical Chemistry, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China.
J Am Chem Soc. 2010 Feb 17;132(6):1925-8. doi: 10.1021/ja908014u.
A zero thermal expansion and multiferroic compound 0.8PbTiO(3)-0.2Bi(Ni(1/2)Ti(1/2))O(3) was developed by a chemical modification route. The structure studies showed that the tetragonality of (1 - x)PbTiO(3)-xBi(Ni(1/2)Ti(1/2))O(3) was gradually weakened to cubic by introducing the dopant Bi(Ni(1/2)Ti)(1/2)O(3), and the thermal expansion coefficient changed from -8.81 x 10(-6)/degrees C to 8.46 x 10(-6)/degrees C in 0.1 < or = x < or = 0.3 around a wide temperature range (from RT to about 500 degrees C). Weak ferromagnetic behavior was observed in the solid solutions, and the superexchange interaction was incorporated to explain its nonmonotonous evolution. Meanwhile, the good piezoelectricity and ferroelectricity were well retained. Further investigations demonstrated that the (1 - x)PbTiO(3)-xBi(Ni(1/2)Ti(1/2))O(3) ceramics possessed good mechanical properties, such as high density and excellent fracture toughness. The improved behaviors make the (1 - x)PbTiO(3)-xBi(Ni(1/2)Ti(1/2))O(3) promising piezoceramics with high thermal stability and mechanical performance. The present work provides a way to design and explore high-performance multiferroic compounds in the synthesis route.
通过化学修饰路线开发了一种零热膨胀和多铁化合物 0.8PbTiO(3)-0.2Bi(Ni(1/2)Ti(1/2))O(3)。结构研究表明，通过引入掺杂剂 Bi(Ni(1/2)Ti)(1/2)O(3)，(1 - x)PbTiO(3)-xBi(Ni(1/2)Ti(1/2))O(3 的四方性逐渐减弱到立方，热膨胀系数在 0.1 < or = x < or = 0.3 范围内从 -8.81 x 10(-6)/degrees C 变化到 8.46 x 10(-6)/degrees C，温度范围很宽（从室温到约 500 摄氏度）。在固溶体中观察到弱铁磁性行为，并结合超交换相互作用来解释其非单调演化。同时，保持了良好的压电性和铁电性。进一步的研究表明，(1 - x)PbTiO(3)-xBi(Ni(1/2)Ti(1/2))O(3)陶瓷具有良好的机械性能，如高密度和优异的断裂韧性。改进的性能使(1 - x)PbTiO(3)-xBi(Ni(1/2)Ti(1/2))O(3)陶瓷成为具有高热稳定性和机械性能的高性能压电陶瓷。本工作为在合成路线中设计和探索高性能多铁化合物提供了一种方法。
