Kinetic analysis of tritium release from irradiated biphasic lithium ceramics Li4SiO4-Li2TiO3 with different phase ratios

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Fusion Engineering and Design Pub Date : 2025-02-25 DOI:10.1016/j.fusengdes.2025.114873

S. Askerbekov , Y. Chikhray , T. Kulsartov , A. Akhanov , A. Shaimerdenov , M. Aitkulov , Zh. Bugybay , I. Kenzhina , Sh. Gizatulin , R. Knitter , J. Leys

{"title":"Kinetic analysis of tritium release from irradiated biphasic lithium ceramics Li4SiO4-Li2TiO3 with different phase ratios","authors":"S. Askerbekov , Y. Chikhray , T. Kulsartov , A. Akhanov , A. Shaimerdenov , M. Aitkulov , Zh. Bugybay , I. Kenzhina , Sh. Gizatulin , R. Knitter , J. Leys","doi":"10.1016/j.fusengdes.2025.114873","DOIUrl":null,"url":null,"abstract":"<div><div>This paper analyzes the kinetics of tritium release from biphasic Li<sub>2</sub>TiO<sub>3</sub>/Li<sub>4</sub>SiO<sub>4</sub> lithium ceramics using thermal desorption spectroscopy after neutron irradiation at the WWR-K reactor. Samples with different Li<sub>2</sub>TiO<sub>3</sub> contents (25 mol% and 35 mol%) in the Li<sub>4</sub>SiO<sub>4</sub> main phase, fabricated by the KALOS process at the Karlsruhe Institute of Technology, were irradiated at a low temperature and a thermal neutron flux of 2 × 10<sup>13</sup> n/(cm²·s) during 21.5 effective full power days until accumulating a fluence of 3.7 × 10<sup>19</sup> n/cm².</div><div>The experimental results confirm the significant influence of phase composition on the processes of tritium release. The analysis allowed us to develop a reasonable mechanism of tritium release during linear heating up to 1173 K.</div><div>Tritium was found to be uniformly distributed throughout the ceramic volume and its release is closely related to the microstructural characteristics of the material. Key factors affecting the process include the presence and distribution of traps and defects interacting with the external surface of the sample. The release process of these traps is determined by the transport of tritium to the boundaries, followed by desorption mainly in the form of HT molecules and has three main peaks.</div><div>Samples with 25 mol% Li<sub>2</sub>TiO<sub>3</sub> showed high activation energy values, indicating the presence of more stable traps and complex tritium transport pathways. With an increased Li<sub>2</sub>TiO<sub>3</sub> content of 35 mol%, a decrease in activation energy was observed, indicating a faster desorption process, probably due to changes in microstructure or the number of active defects facilitating tritium release at lower temperatures.</div></div>","PeriodicalId":55133,"journal":{"name":"Fusion Engineering and Design","volume":"214 ","pages":"Article 114873"},"PeriodicalIF":1.9000,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fusion Engineering and Design","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0920379625000754","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

This paper analyzes the kinetics of tritium release from biphasic Li₂TiO₃/Li₄SiO₄ lithium ceramics using thermal desorption spectroscopy after neutron irradiation at the WWR-K reactor. Samples with different Li₂TiO₃ contents (25 mol% and 35 mol%) in the Li₄SiO₄ main phase, fabricated by the KALOS process at the Karlsruhe Institute of Technology, were irradiated at a low temperature and a thermal neutron flux of 2 × 10¹³ n/(cm²·s) during 21.5 effective full power days until accumulating a fluence of 3.7 × 10¹⁹ n/cm².

The experimental results confirm the significant influence of phase composition on the processes of tritium release. The analysis allowed us to develop a reasonable mechanism of tritium release during linear heating up to 1173 K.

Tritium was found to be uniformly distributed throughout the ceramic volume and its release is closely related to the microstructural characteristics of the material. Key factors affecting the process include the presence and distribution of traps and defects interacting with the external surface of the sample. The release process of these traps is determined by the transport of tritium to the boundaries, followed by desorption mainly in the form of HT molecules and has three main peaks.

Samples with 25 mol% Li₂TiO₃ showed high activation energy values, indicating the presence of more stable traps and complex tritium transport pathways. With an increased Li₂TiO₃ content of 35 mol%, a decrease in activation energy was observed, indicating a faster desorption process, probably due to changes in microstructure or the number of active defects facilitating tritium release at lower temperatures.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

Fusion Engineering and Design 工程技术-核科学技术

CiteScore

3.50

自引率

23.50%

发文量

275

审稿时长

3.8 months

期刊介绍： The journal accepts papers about experiments (both plasma and technology), theory, models, methods, and designs in areas relating to technology, engineering, and applied science aspects of magnetic and inertial fusion energy. Specific areas of interest include: MFE and IFE design studies for experiments and reactors; fusion nuclear technologies and materials, including blankets and shields; analysis of reactor plasmas; plasma heating, fuelling, and vacuum systems; drivers, targets, and special technologies for IFE, controls and diagnostics; fuel cycle analysis and tritium reprocessing and handling; operations and remote maintenance of reactors; safety, decommissioning, and waste management; economic and environmental analysis of components and systems.