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Dense dielectric ceramics with local graded structure from core-shell particles: preparation and properties

机译:由核-壳颗粒形成局部渐变结构的致密介电陶瓷:制备和性能

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摘要

The modification of the surface properties of particles by coating with a different material, resulting in the formation of core-shell structures, is a well-known process. However, the consolidation of core-shell particles in bulk ceramics has not been extensively investigated yet, mainly because of the difficulty in controlling interdiffusion and interface reactions. In this study, we have coated BaTiO(3) spherical templates with SrTiO(3) and BaZrO(3) using a precipitation process from inorganic precursors. The size of the particles as well as the overall composition can be tailored over a wide range. Densification of the resulting core-shell particles was accomplished either using conventional sintering or spark plasma sintering. Dense ceramics with a graded composition at the level of the single grains could only be obtained by careful choice of the sintering conditions. The final ceramics show strongly modified dielectric properties in comparison to both the parent compounds and the homogeneous solid solutions. The proposed approach is quite generic and suggests new possibilities for the realization of polycrystalline materials with local graded structure by the controlled sintering of core-shell particles.
机译:通过用不同的材料涂覆来改变颗粒的表面性质,导致形成核-壳结构,是众所周知的方法。但是,大块陶瓷中核-壳颗粒的固结尚未得到广泛研究,这主要是由于难以控制相互扩散和界面反应。在这项研究中,我们使用从无机前驱体的沉淀过程,用SrTiO(3)和BaZrO(3)涂覆了BaTiO(3)球形模板。可以在宽范围内调整颗粒的大小以及整个组成。所得的核-壳颗粒的致密化可以使用常规烧结或火花等离子体烧结来完成。只有仔细选择烧结条件,才能获得具有单晶粒度梯度成分的致密陶瓷。与母体化合物和均相固溶体相比,最终的陶瓷均表现出强烈的介电性能。所提出的方法是相当通用的,并提出了通过核-壳颗粒的可控烧结来实现具有局部渐变结构的多晶材料的新可能性。

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