The effect of grain size was not fully explored in composites containing ferroelectric and magnetic phases including the independent properties of each phase. Aiming to study the dependence of ferroic and multiferroic properties with average grain size in composites this work reports preparation method and electric, magnetic and magnetoelectric properties of particulate composites with distinct combination of grain size of each phase. A new sintering method was applied to prepare a group of samples with distinct configuration of grain size distribution. With this method it was possible to densify ceramics avoiding grain growth using spark plasma sintering. It was observed that the all ferroic and multiferroic properties were correlated with the setup of grain size of each phase in the composite, by example the dependence of magnetic properties with the electric phase grain size. Besides it was noticed that is possible to improve magnetoelectric coefficient by changing grain size of both phase, even inducing the self-biased effect by decreasing the grain size of the ferroelectric phase.

在包含铁电相和磁相的复合材料中，还没有充分探索晶粒尺寸的影响，包括每个相的独立特性。为了研究复合材料中铁性和多铁性性质与平均晶粒尺寸的关系，本工作报告了制备方法以及具有各相晶粒尺寸不同组合的颗粒复合材料的电、磁和磁电性能。应用一种新的烧结方法制备了一组具有不同晶粒尺寸分布构型的样品。通过这种方法，可以使用放电等离子烧结来使陶瓷致密，避免晶粒生长。据观察，全铁性和多铁性性质与复合材料中各相的晶粒尺寸设置相关，例如，磁性与电相晶粒尺寸的相关性。此外还注意到可以通过改变两相的晶粒尺寸来提高磁电系数，甚至可以通过减小铁电相的晶粒尺寸来诱导自偏置效应。