Thermal behavior of goethite during transformation to hematite
文献类型：期刊论文
| 作者 | Fan, HL; Song, BZ; Li, QX |
| 刊名 | MATERIALS CHEMISTRY AND PHYSICS
 |
| 出版日期 | 2006-07-01 |
| 卷号 | 98期号:1页码:148-153 |
| 关键词 | thermal behavior goethite transformation non-isothermal kinetics mechanism microstructural changes |
| ISSN号 | 0254-0584 |
| 其他题名 | Mater. Chem. Phys. |
| 中文摘要 | Under non-isothermal conditions, thermal transformation kinetics of goethite was assessed from the shape of a derivative thermogravimetric (DTG) curve and then verified by the correlation between the maximum decomposition degrees and thermal kinetic mechanisms. Kinetic analysis showed that this process was governed by the three-dimensional diffusion. Microstructural changes during the process were characterized by use of infrared spectra (IR), transmission electron microscopy (TEM) and differential thermal analysis (DTA). Combining non-isothermal kinetic results and microstructural changes, thermal behavior of this transformation was described as followed. In the beginning, surface autodiffusion played a dominant role. With increasing temperatures, micropores were produced due to three-dimensional diffusion of hydrogen or hydroxyl groups in bulk goethite crystals and then merged into the slits because of the high water pressure inside. The morphology of hematite particles with regular texture was changed due to the recrystalyzation role, and finally spherical particles were formed. (c) 2005 Elsevier B.V. All rights reserved. |
| 英文摘要 | Under non-isothermal conditions, thermal transformation kinetics of goethite was assessed from the shape of a derivative thermogravimetric (DTG) curve and then verified by the correlation between the maximum decomposition degrees and thermal kinetic mechanisms. Kinetic analysis showed that this process was governed by the three-dimensional diffusion. Microstructural changes during the process were characterized by use of infrared spectra (IR), transmission electron microscopy (TEM) and differential thermal analysis (DTA). Combining non-isothermal kinetic results and microstructural changes, thermal behavior of this transformation was described as followed. In the beginning, surface autodiffusion played a dominant role. With increasing temperatures, micropores were produced due to three-dimensional diffusion of hydrogen or hydroxyl groups in bulk goethite crystals and then merged into the slits because of the high water pressure inside. The morphology of hematite particles with regular texture was changed due to the recrystalyzation role, and finally spherical particles were formed. (c) 2005 Elsevier B.V. All rights reserved. |
| WOS标题词 | Science & Technology ; Technology |
| 类目[WOS] | Materials Science, Multidisciplinary |
| 研究领域[WOS] | Materials Science |
| 关键词[WOS] | KINETIC-ANALYSIS ; DEHYDRATION ; DECOMPOSITION ; MAGNETITE ; MECHANISM |
| 收录类别 | SCI |
| 原文出处 | |
| 语种 | 英语 |
| WOS记录号 | WOS:000237640600026 |
| 公开日期 | 2013-10-24 |
| 版本 | 出版稿 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/4105]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 作者单位 | Chinese Acad Sci, Inst Proc Engn, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Fan, HL,Song, BZ,Li, QX. Thermal behavior of goethite during transformation to hematite[J]. MATERIALS CHEMISTRY AND PHYSICS,2006,98(1):148-153. |
| APA | Fan, HL,Song, BZ,&Li, QX.(2006).Thermal behavior of goethite during transformation to hematite.MATERIALS CHEMISTRY AND PHYSICS,98(1),148-153. |
| MLA | Fan, HL,et al."Thermal behavior of goethite during transformation to hematite".MATERIALS CHEMISTRY AND PHYSICS 98.1(2006):148-153. |
入库方式： OAI收割
来源：过程工程研究所
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