Bridging the Gap between Bulk Compression and Indentation Test on Room-Temperature Plasticity in Oxides: Case Study on SrTiO3
Bridging the Gap between Bulk Compression and Indentation Test on Room-Temperature Plasticity in Oxides: Case Study on SrTiO3
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DOI：
10.3390/cryst10100933
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发表时间：
2020-10-01
期刊：
影响因子：
2.7
通讯作者：
Nakamura, Atsutomo
中科院分区：
文献类型：
--
作者：
Fang, Xufei;Porz, Lukas;Nakamura, Atsutomo
无机陶瓷和半导体中基于位错的功能正引起越来越多的关注，与大多数陶瓷材料在室温下是脆性的传统观点形成对比。因此，了解陶瓷和先进半导体材料中的位错行为对于设计用于收获基于位错的功能的此类材料和器件的机械可靠性至关重要。在这里，我们比较了纳米/微米尺度的压痕和宏观尺度的体单轴变形之间的力学测试，并突出了单晶SrTiO 3，模型钙钛矿中的位错塑性。的相似性和差异，以及两个测试协议的优点和局限性进行了讨论的基础上的晶体塑性的实验结果，重点是预先存在的缺陷人口被探测与不同的体积在整个长度尺度（“尺寸效应”）。我们期望这项工作为研究各种先进功能陶瓷和半导体中基于位错的塑性铺平道路。
Dislocation-based functionalities in inorganic ceramics and semiconductors are drawing increasing attention, contrasting the conventional belief that the majority of ceramic materials are brittle at room temperature. Understanding the dislocation behavior in ceramics and advanced semiconducting materials is therefore critical for the mechanical reliability of such materials and devices designed for harvesting the dislocation-based functionalities. Here we compare the mechanical testing between indentation at nano-/microscale and bulk uniaxial deformation at macroscale and highlight the dislocation plasticity in single crystal SrTiO3, a model perovskite. The similarities and differences as well as the advantages and limitations of both testing protocols are discussed based on the experimental outcome of the crystal plasticity, with a focus on the pre-existing defect population being probed with different volumes across the length scales ("size effect"). We expect this work to pave the road for studying dislocation-based plasticity in various advanced functional ceramics and semiconductors.