Development of positron microscope with high lateral resolution and its applications

2014 Fiscal Year Final Research Report

• Project/Area Number: 24350036
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Analytical chemistry
• Research Institution: Chiba University
• Principal Investigator: FUJINAMI Masanori 千葉大学, 工学(系)研究科(研究院), 教授 (50311436)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 格子欠陥 / 二次元分布分析 / 水素 / 水素脆化 / 電気めっき / 量子ビーム / 放射線 / 陽電子

Outline of Final Research Achievements

Positron annihilation technique affords us a lot of information on open-volume type defects in bulk, but the locally induced defects in materials are far from equilibrium and have never been clarified yet. We have been developed positron probe microanalyzer (PPMA) to measure the local area with several tens micron meter. PPMA has been applied to detection of hydrogen-related defects in metals since hydrogen reduces a formation energy of defects and affects their properties. As a result, it has been found that vacancy clusters extend in wider area, compared with usual in pure ion subjected to hydrogen embrittlement and are involved in the electrodeposited Cu film. A formation of vacancy clusters is influenced with the mechanical properties.

Free Research Field

分析化学，量子ビーム