Vivar-Ocampo Rodrigo, Pardo Lorena, Ávila David, Morán Emilio, González Amador M, Bucio Lauro, Villafuerte-Castrejón María-Elena
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Ciudad Universitaria, A.P. 70-360, México D.F. 04510, Mexico.
Instituto de Ciencia de Materiales de Madrid, CSIC, Sor Juana Inés de la Cruz, 3, Cantoblanco, 28049 Madrid, Spain.
Materials (Basel). 2017 Jul 1;10(7):736. doi: 10.3390/ma10070736.
Research and development of lead-free piezoelectric materials are still the hottest topics in the field of piezoelectricity. One of the most promising lead-free family of compounds to replace lead zirconate-titanate for actuators is that of BiNaTiO₃ (BNT) based solid solutions. The pseudo-binary (1 - )BiNaTiO₃-BaCaTiO₃ system has been proposed for high temperature capacitors and not yet fully explored as piezoelectric material. In this work, the solid solution with = 0.06 and = 0.10 was obtained by two different synthesis routes: solid state and Pechini, aiming at using reduced temperatures, both in synthesis (<800 °C) and sintering (<1150 °C), while maintaining appropriated piezoelectric performance. Crystal structure, ceramic grain size, and morphology depend on the synthesis route and were analyzed by X-ray diffraction, together with scanning and transmission electron microscopy. The effects of processing and ceramic microstructure on the structural, dielectric, ferroelectric, and piezoelectric properties were discussed in terms of a shift of the Morphotropic Phase Boundary, chemically induced by the synthesis route.
无铅压电材料的研发仍然是压电领域最热门的话题。用于致动器替代锆钛酸铅的最有前途的无铅化合物家族之一是基于BiNaTiO₃(BNT)的固溶体。伪二元(1 - )BiNaTiO₃ - BaCaTiO₃体系已被提议用于高温电容器,但作为压电材料尚未得到充分探索。在这项工作中,通过两种不同的合成路线:固态法和佩琴尼法,获得了x = 0.06和y = 0.10的固溶体,旨在在合成(<800°C)和烧结(<1150°C)过程中使用较低温度,同时保持适当的压电性能。晶体结构、陶瓷晶粒尺寸和形态取决于合成路线,并通过X射线衍射以及扫描和透射电子显微镜进行了分析。从由合成路线化学诱导的准同型相界的移动角度讨论了加工和陶瓷微观结构对结构、介电、铁电和压电性能的影响。