锆钛酸铅与铌酸钾钠铁电材料中子和伽马辐照效应及损伤机理研究

项目名称： 锆钛酸铅与铌酸钾钠铁电材料中子和伽马辐照效应及损伤机理研究

项目编号： No.11305152

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 梁文峰

作者单位： 中国工程物理研究院核物理与化学研究所

项目金额： 27万元

中文摘要： 半导体的界面态和少数载流子寿命都对辐照损伤缺陷敏感，这就决定了半导体器件是空间、反应堆及核爆炸辐照环境工作的电子系统抗辐射性能提升的瓶颈。铁电材料以电畴极化状态响应为工作机理，相对受辐射损伤的影响较小，是替换半导体用于辐射环境下电子器件研制的一个理想选择。然而，关于铁电材料的辐射效应和辐射损伤机理的研究还很不充分，本项目以原子序数差异显著的两类典型铁电材料体系--Pb(Zr,Ti)O3和(K,Na)NbO3为对象，对这两个体系中典型组分的辐照效应和损伤机理进行研究，包括中子和伽马辐照下引起的瞬态电压/电流响应，其铁电、压电等性能退化与辐射强度的关系，确定其辐射损伤阈值，通过微观缺陷及结构状态表征研究其微观损伤机理。研究获得的结果是研制抗辐射铁电器件的基础。

中文关键词： 铁电材料；中子辐照效应；伽马辐照效应；核辐射探测器；辐照改性

英文摘要： For electronic systems working in radioactive environments as the space, reactors, or a nuclear explosion, semiconductor devices are bottlenecks for the enhancement of radiation resistence, because both the interface state and minority carrier lifetime are sensitive to radiation damage. A ferroelectric material depends on the response of domains' polarizations and is comparative tolerant towards radiation defects, which is an ideal alternative of semiconductors for electronic device applications in radioactive circumstances. While the irradiation effects and damage mechanism are not enough for ferroelectric materials, typical compositions of Pb(Zr,Ti)O3 and (K,Na)NbO3, two typical ferroelectric materials with notably different atomic numbers, are adopted in this program for investigation, including instantaneous current/voltage response induced by neutron and gamma irradiation, the relation between radiation fluence and the degeneration of ferroelectric and piezoelectric properties, the damage threshold fluence, and damage mechanism by characteriation of microscopic defects and structures. The research results are fundamental for development of radiation resistance ferroelectric devices.

英文关键词： Ferroelectric materials；Neutron irradiation effects；Gamma irradiation effects；Nuclear radiation detectors；radiation modification