{"title":"Thermodynamic research of the reaction mechanism for TiB2 synthesized by carbothermal reduction","authors":"Xingguo Wang, Xin Li, Bin Chen, Jian Tang, Shilun Chang, Chen Xu","doi":"10.1007/s41779-024-01074-y","DOIUrl":null,"url":null,"abstract":"<p>The reaction mechanism of TiB<sub>2</sub> synthesized by carbothermal reduction is unclear due to a lack of thermodynamic research. In this work, the phase diagrams of TiO<sub>2</sub>-B<sub>2</sub>O<sub>3</sub>-C system were analyzed at a large temperature range (900–1800 °C), illustrating that Ti<sub>4</sub>O<sub>7</sub>, Ti<sub>3</sub>O<sub>5</sub>, and TiC were the main intermediate products. According to the Gibbs free energy minimum principle, the synthesis pathways of the main intermediate products and the target product TiB<sub>2</sub> were discussed, respectively. Based on the thermodynamic research, the reaction mechanism of TiO<sub>2</sub>-B<sub>2</sub>O<sub>3</sub>-C system was proposed and verified by experimental research at 900–1500 °C. X-ray-pure TiB<sub>2</sub> powder was synthesized at 1500 °C for 30 min and the possible reaction mechanism could be divided into three stages: TiO<sub>2</sub>(anatase)→TiO<sub>2</sub>(rutile)→Ti<sub>3</sub>O<sub>5</sub>, TiC →TiB<sub>2</sub>.</p>","PeriodicalId":673,"journal":{"name":"Journal of the Australian Ceramic Society","volume":"49 1","pages":""},"PeriodicalIF":1.8000,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the Australian Ceramic Society","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s41779-024-01074-y","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
引用次数: 0
Abstract
The reaction mechanism of TiB2 synthesized by carbothermal reduction is unclear due to a lack of thermodynamic research. In this work, the phase diagrams of TiO2-B2O3-C system were analyzed at a large temperature range (900–1800 °C), illustrating that Ti4O7, Ti3O5, and TiC were the main intermediate products. According to the Gibbs free energy minimum principle, the synthesis pathways of the main intermediate products and the target product TiB2 were discussed, respectively. Based on the thermodynamic research, the reaction mechanism of TiO2-B2O3-C system was proposed and verified by experimental research at 900–1500 °C. X-ray-pure TiB2 powder was synthesized at 1500 °C for 30 min and the possible reaction mechanism could be divided into three stages: TiO2(anatase)→TiO2(rutile)→Ti3O5, TiC →TiB2.
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