High thermal stability of amorphous TiO2 enhanced by OH

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids Pub Date : 2025-05-06 DOI:10.1016/j.jnoncrysol.2025.123568

Benshun Ma , Xiao Chen , Jianing Wang , Wei Xu , Lijian Song , Meng Gao , Juntao Huo , Jun-Qiang Wang

{"title":"High thermal stability of amorphous TiO2 enhanced by OH","authors":"Benshun Ma , Xiao Chen , Jianing Wang , Wei Xu , Lijian Song , Meng Gao , Juntao Huo , Jun-Qiang Wang","doi":"10.1016/j.jnoncrysol.2025.123568","DOIUrl":null,"url":null,"abstract":"<div><div>Amorphous titanium dioxide (A-TiO2), a key component of lunar ilmenite's surface layer and a promising material for helium bubble encapsulation, plays a vital role in lunar resource utilization. This study focuses on its thermal stability, a critical factor for practical applications. A-TiO2 is successfully synthesized via the sol-gel method, and its thermodynamic properties are systematically investigated using TG-DSC. It is found that hydroxyl groups enhance the thermal stability of A-TiO2 at ambient temperature by forming hydrogen bond networks. Specifically, after 15 days of aging, hydroxyl‑rich A-TiO2 exhibit a crystallization enthalpy of 147.8 J/g, significantly larger than that of hydroxyl‑free counterparts (110.2 J/g). Isochronal crystallization analysis reveals that the instantaneous A-TiO2 after dehydration exhibits much lower crystallization activation energy (Ea = 321.1 kJ/mol) than the relaxed hydroxyl‑free A-TiO2 (Ea = 415.7 kJ/mol). This suggests that hydrogen bond network stabilize the amorphous structure of A-TiO2. These findings are also helpful for understanding the long-time stability for the lunar amorphous TiO2.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"663 ","pages":"Article 123568"},"PeriodicalIF":3.2000,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Non-crystalline Solids","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022309325001838","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}

引用次数: 0

Abstract

Amorphous titanium dioxide (A-TiO₂), a key component of lunar ilmenite's surface layer and a promising material for helium bubble encapsulation, plays a vital role in lunar resource utilization. This study focuses on its thermal stability, a critical factor for practical applications. A-TiO₂ is successfully synthesized via the sol-gel method, and its thermodynamic properties are systematically investigated using TG-DSC. It is found that hydroxyl groups enhance the thermal stability of A-TiO₂ at ambient temperature by forming hydrogen bond networks. Specifically, after 15 days of aging, hydroxyl‑rich A-TiO₂ exhibit a crystallization enthalpy of 147.8 J/g, significantly larger than that of hydroxyl‑free counterparts (110.2 J/g). Isochronal crystallization analysis reveals that the instantaneous A-TiO₂ after dehydration exhibits much lower crystallization activation energy (E_a = 321.1 kJ/mol) than the relaxed hydroxyl‑free A-TiO₂ (E_a = 415.7 kJ/mol). This suggests that hydrogen bond network stabilize the amorphous structure of A-TiO₂. These findings are also helpful for understanding the long-time stability for the lunar amorphous TiO₂.

查看原文本刊更多论文

OH增强非晶态TiO2的高热稳定性

无定形二氧化钛（a - tio2）是月球钛铁矿表层的关键成分，是极具潜力的氦泡封装材料，在月球资源利用中发挥着至关重要的作用。本研究的重点是热稳定性，这是实际应用的关键因素。采用溶胶-凝胶法制备了A-TiO2，并用TG-DSC对其热力学性质进行了系统研究。研究发现羟基通过形成氢键网络增强了A-TiO2在室温下的热稳定性。具体来说，经过15天的老化，富羟基的a - tio2的结晶焓为147.8 J/g，明显大于无羟基的a - tio2的结晶焓（110.2 J/g）。等时结晶分析表明，脱水后瞬时A-TiO2的结晶活化能（Ea = 321.1 kJ/mol）明显低于松弛无羟基A-TiO2的结晶活化能（Ea = 415.7 kJ/mol）。这表明氢键网络稳定了A-TiO2的非晶结构。这些发现也有助于理解月球无定形TiO2的长期稳定性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Non-crystalline Solids 工程技术-材料科学：硅酸盐

CiteScore

6.50

自引率

11.40%

发文量

576

审稿时长

35 days

期刊介绍： The Journal of Non-Crystalline Solids publishes review articles, research papers, and Letters to the Editor on amorphous and glassy materials, including inorganic, organic, polymeric, hybrid and metallic systems. Papers on partially glassy materials, such as glass-ceramics and glass-matrix composites, and papers involving the liquid state are also included in so far as the properties of the liquid are relevant for the formation of the solid. In all cases the papers must demonstrate both novelty and importance to the field, by way of significant advances in understanding or application of non-crystalline solids; in the case of Letters, a compelling case must also be made for expedited handling.