纯钚在辐照条件下相稳定性的热力学研究

卢勇; 唐巧巧; 江政; 冯翔; 王翠萍; 刘兴军

doi:10.11889/j.0253-3219.2018.hjs.41.060203

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纯钚在辐照条件下相稳定性的热力学研究

低能加速器技术、射线技术及应用 | 更新时间：2021-05-19

- 纯钚在辐照条件下相稳定性的热力学研究
- Thermodynamic study on phase stability of plutonium under irradiation
- 核技术 2018年41卷第6期文章编号：060203
- 作者机构：
  
  厦门大学材料学院厦门 361005
- 作者简介：
  
  [ "卢勇, 男, 1984年出生, 研究领域为材料相变热力学和动力学", "LU Yong, male, born in 1984, focusing on material phase transition thermodynamics and kinetics" ]
- 基金信息：
  
  科技部重点研发计划(2017YFB0702401);中央高校基本科研业务费专项资金(20720170038)
- DOI：10.11889/j.0253-3219.2018.hjs.41.060203
  中图分类号： TL273
- 收稿日期：2018-02-06，
  
  修回日期：2018-03-27，
  
  纸质出版日期：2018-06-10
- 稿件说明：
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卢勇, 唐巧巧, 江政, 等. 纯钚在辐照条件下相稳定性的热力学研究[J]. 核技术, 2018,41(6):060203

Yong LU, Qiaoqiao TANG, Zheng JIANG, et al. Thermodynamic study on phase stability of plutonium under irradiation[J]. Nuclear techniques, 2018, 41(6): 060203
卢勇, 唐巧巧, 江政, 等. 纯钚在辐照条件下相稳定性的热力学研究[J]. 核技术, 2018,41(6):060203 DOI： 10.11889/j.0253-3219.2018.hjs.41.060203.

Yong LU, Qiaoqiao TANG, Zheng JIANG, et al. Thermodynamic study on phase stability of plutonium under irradiation[J]. Nuclear techniques, 2018, 41(6): 060203 DOI： 10.11889/j.0253-3219.2018.hjs.41.060203.

摘要

Pu（钚）是一种十分重要的核工业原料，随温度变化会有不同的结构，并且辐照对其有着重要的影响。为了探究辐照强度、辐照时间对钚的相变化的影响，本研究在纯Pu的吉布斯（Gibbs）自由能计算基础上，通过考虑辐照条件下空位产生的过剩自由能，建立了纯Pu在辐照条件下的热力学模型。计算不同辐照条件下的温度-吉布斯自由能函数，得到了不同辐照强度下纯Pu的相图，分析不同辐照强度、辐照时间对其6个同素异构体相稳定性的影响。研究结果表明：辐照对较低温度下纯Pu的相稳定性影响较大，接近室温时出现了γ-Pu的相区，其稳定存在的温度范围会随着辐照的强度增强、辐照时间加长而扩大，而且辐照使α-Pu趋于稳定。本研究所建立的辐照条件下的纯Pu的相图为Pu基核燃料的设计提供重要的基础理论指导。

Abstract

Background

Pu is an important material for nuclear industry

its structure is sensitive to temperature

and irradiation has an important impact on it.

Purpose

In order to explore the thermodynamic effects of irradiation on plutonium

the phase diagram of pure Pu under the irradiation established in this study provides important theoretical guidance for the design of Pu-based nuclear fuels.

Methods

Based on Gibbs free energy of pure Pu

the thermodynamic model of Pu under irradiation was established by considering the excess free energy of vacancies under irradiation conditions.

Results

The Gibbs free energy function under different irradiation was calculated

and the phase diagrams of pure Pu under different irradiation intensities were obtained. The effects of different irradiation conditions and irradiation time on the stability of six allotropic phases were analyzed.

Conclusion

The results indicated that irradiation has great influence on the phase stability of plutonium at lower temperature and the stable phase region of γ-Pu appears near room temperature. Its stable temperature range increased with the increase of the intensity of irradiation and time.

关键词

Keywords

references

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