Kabir Ahsanul, Lemieszek Bartlomiej, Varenik Maxim, Buratto Tinti Victor, Molin Sebastian, Lubomirsky Igor, Esposito Vincenzo, Kern Frank
Institute for Manufacturing Technology of Ceramic Components and Composites, University of Stuttgart, Stuttgart 70569, Germany.
Advanced Materials Center, Faculty of Electronics, Telecommunications, and Informatics, Gdańsk University of Technology, Ul. G. Narutowicza 11/12, Gdańsk 80-233, Poland.
ACS Appl Mater Interfaces. 2024 Mar 13;16(10):12765-12772. doi: 10.1021/acsami.3c17501. Epub 2024 Mar 1.
Compositionally complex oxides (CCOs) or high-entropy oxides (HEOs) are new multielement oxides with unexplored physical and functional properties. In this work, we report fluorite structure-derived compositionally complex zirconia with composition Zr(GdPrNdSmY)O ( = 0.1 and 0.2) synthesized in solid-state reaction route and sintered via hot pressing at 1350 °C. We explore the evolution of these oxides' structural, microstructural, mechanical, electrical, and electromechanical properties regarding phase separation and sintering mechanisms. Highly dense ceramics are achieved by bimodal mass diffusion, composing nanometric tetragonal and micrometric cubic grains microstructure. The material exhibits an anomalously large electrostriction response exceeding the M value of 10 m/V at room temperature and viscoelastic properties of primary creep in nanoindentation measurement under fast loading. These findings are strikingly similar to those reported for doped ceria and bismuth oxide derivates, highlighting the presence of a large concentration of point defects linked to structural distortion and anelastic behavior, which are characteristics of nonclassical ionic electrostrictors.
成分复杂的氧化物（CCOs）或高熵氧化物（HEOs）是具有尚未探索的物理和功能特性的新型多元素氧化物。在这项工作中，我们报告了通过固态反应路线合成并在1350℃下通过热压烧结的具有Zr(GdPrNdSmY)O（ = 0.1和0.2）组成的萤石结构衍生的成分复杂的氧化锆。我们探索了这些氧化物在相分离和烧结机制方面的结构、微观结构、机械、电学和机电性能的演变。通过双峰质量扩散实现了高密度陶瓷，其微观结构由纳米级四方晶粒和微米级立方晶粒组成。该材料在室温下表现出异常大的电致伸缩响应，超过10 m/V的M值，并且在快速加载下的纳米压痕测量中具有初级蠕变的粘弹性特性。这些发现与报道的掺杂二氧化铈和氧化铋衍生物的发现惊人地相似，突出了与结构畸变和滞弹性行为相关的大量点缺陷的存在，这是非经典离子电致伸缩器的特征。
