Synergy effects of electronic/nuclear excitatiion and microstructure evolution in ceramic compounds

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K05333
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 31010:Nuclear engineering-related
• Research Institution: Kyushu University
• Principal Investigator: Yasuda Kazuhiro 九州大学, 工学研究院, 教授 (80253491)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 照射損傷 / 原子炉燃料・材料 / はじき出し損傷/電子励起 / 電子顕微鏡法 / 分子動力学法 / カソードルミネッセンス法 / その場観察・計測法

Outline of Final Research Achievements

Oxide and nitride ceramics are important nuclear materials expected as nuclear fuels and transmutation targets. These materials are used under various radiations with different energies and energy loss process. In this study, we investigated the synergy effects of electronic excitation and elastic displacement damage through electron microscopy, synchrotron radiation spectroscopy, molecular dynamics simulation. Specifically, the effects of electronic excitation/displacement damage on the formation of radiation-induced defects in ceramics under swift heavy ion irradiation and with synergetic irradiation of ions and electrons, quantitative evaluation of the ion track structure and cation disordering, evaluation of the displacement energy of zirconium nitride, and evaluation of point defect formation in ceria through "in-situ" cathodeluminescence technique under electron irradiation were investigated.

Free Research Field

原子力学

Academic Significance and Societal Importance of the Research Achievements

本研究の成果はこれまで十分に理解が進んでいなかったセラミックス材料のはじき出し損傷と電子励起の同時照射効果に関する礎的な知見を与え、またそのための実験手法の開発に関わる成果を挙げている。また、窒化物のはじき出しエネルギーとその形態に関する知見は、原子力材料に留まらず関連する種々の機能性セラミックス材料の格子欠陥形成・制御に関する重要な知見を与えるものである。