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Fields Medical Life Sciences Information Communication Environment Nanotechnology / Materials Energy Manufacturing Technology Social Infrastructure Frontier Liberal Arts Themes Researchers JP Top Nanotechnology / Materials Analysis and Function Elucidation of Fine Clusters and Defects in Materials Invisible by Electron Microscopy Analysis and Function Elucidation of Fine Clusters and Defects in Materials Invisible by Electron Microscopy JAPANESEINQUIRY update：2021/07/07   NEXT PREV Features and Uniqueness It is well known that nano-scale impurity/solute clusters, defects, defect clusters and their complexes affect the mechanical and electrical properties in materials. However, it is very difficult to observe these objects even by state-of-the-art electron microscopes. We overcome the difficulty by employing noble two techniques: laser three-dimensional atom probe (3D-AP) technique and positron annihilation spectroscopy (PAS). Laser 3D-AP can map out each atom in various materials (metals, semiconductors, insulators) in three-dimensional real space with nearly atomic scale resolution. PAS can detect vacancy-type defects and defect-impurity complexes very sensitively. Practical Application By combining these methods, we are going to reveal the functions of the fine impurity clusters and defects to the materials: developments of new nano-structured materials, the mechanism of degradation of aged structural materials, the fall in the yield of semiconductor device production, and developments of quantum devices etc. Keywords Defect impurity cluster 3D atom probe positron nano-scale analysis of materials microscopy Researchers Institute for Materials Research Yasuyoshi Nagai, ProfessorPhD Laboratory Website researchmap Laboratory Website researchmap Related Information PublicationK. Inoue, A. K. Kambham, D. Mangelinck, D. Lawrence, D. J. Larson "Atom-probe-tomographic Studies on Silicon-Based Semiconductor Devices" Microscopy Today　Vol. 20 Issue.5 (2012) 38 Browsing History User Who Reviewed This Content Also Reviewed Extracorporeal Shock Wave Therapy as a New, Non-Invasive Angiogenic Therapy [ SHIMOKAWA Hiroaki Professor ] Molecular Imaging from Basic Research to Clinical Application [ YANAI Kazuhiko Professor ] Noninvasive Ultrasonic Measurement of Dynamic Properties of Heart and Arteries [ Hiroshi Kanai Professor ] Research Profiles ©TOHOKU UNIVERSITY How to Use FAQ For Researchers Site Policy [jp] ©TOHOKU UNIVERSITY Fields Medical Life Sciences Information Communication Environment Nanotechnology / Materials Energy Manufacturing Technology Social Infrastructure Frontier Liberal Arts Fields Themes Researchers 日本語 ENGLISH Close