Characteristic low-temperature magnetic properties of aluminous goethite [alpha-(Fe, Al)OOH] explained
文献类型：期刊论文
| 作者 | Liu, Qingsong; Yu, Yongjae; Torrent, Jose; Roberts, Andrew P.; Pan, Yongxin; Zhu, Rixiang |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2006-12-16 |
| 卷号 | 111期号:B12 |
| ISSN号 | 0148-0227 |
| DOI | 10.1029/2006JB004560 |
| 文献子类 | Article |
| 英文摘要 | Goethite (alpha-FeOOH) is an antiferromagnetic iron oxyhydroxide that forms as a weathering product of iron-bearing minerals. We systematically investigated the low- and room temperature properties of well-defined aluminous goethites [alpha-(Fe, Al)OOH] with varying grain size and Al content. A marked decrease in the Neel temperature with increasing Al content for goethite lowers the blocking temperature distribution, which produces an increase in the remanent magnetization on cooling. The zero-field-cooled (ZFC) and field-cooled (FC) curves are irreversible. This is due to an additional partial thermal remanent magnetization (pTRM), which is acquired at low temperatures during the FC process because the initial 300 K remanence is far from being saturated due to the extremely high saturation field of goethite. This pTRM can be thermally demagnetized when reheating a sample back to 300 K. Finally, a sharp decrease in the bulk coercivity at 11-13 mol % Al is mostly caused by a broad coercivity distribution due to nonuniformity of Al substitution, which becomes more significant with increasing Al content. The positive correlation between pTRM acquisition during the FC process and the bulk coercivity strongly indicates that the ZFC/FC behavior is controlled by the bulk coercivity, which is, in turn, determined by Al substitution. This explanation of the characteristic low- temperature magnetic properties of Al goethite provides important constraints for identifying natural Al goethite bearing samples and quantitatively estimating the contributions of this mineral to the bulk magnetic properties of such samples. |
| WOS关键词 | NATURAL GOETHITE ; SUBSTITUTED GOETHITES ; SYNTHETIC GOETHITE ; IRON-OXIDES ; LOW-FIELD ; REMANENCE ; BEHAVIOR ; DEMAGNETIZATION ; THERMOREMANENCE ; SUSCEPTIBILITY |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS记录号 | WOS:000242947600001 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/66580]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Liu, Qingsong |
| 作者单位 | 1.Univ Southampton, Natl Oceanog Ctr, Sch Ocean & Earth Sci, Southampton SO14 3ZH, Hants, England 2.Korea Univ, Dept Earth & Environm Sci, Seoul, South Korea 3.Univ Cordoba, Dept Ciencias & Recursos Agr & Forestales, E-14071 Cordoba, Spain 4.Chinese Acad Sci, Inst Geol & Geophys, Paleomagnetism & Geochronol Lab SKL LE, Beijing 10029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Qingsong,Yu, Yongjae,Torrent, Jose,et al. Characteristic low-temperature magnetic properties of aluminous goethite [alpha-(Fe, Al)OOH] explained[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2006,111(B12). |
| APA | Liu, Qingsong,Yu, Yongjae,Torrent, Jose,Roberts, Andrew P.,Pan, Yongxin,&Zhu, Rixiang.(2006).Characteristic low-temperature magnetic properties of aluminous goethite [alpha-(Fe, Al)OOH] explained.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,111(B12). |
| MLA | Liu, Qingsong,et al."Characteristic low-temperature magnetic properties of aluminous goethite [alpha-(Fe, Al)OOH] explained".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 111.B12(2006). |
入库方式： OAI收割
来源：地质与地球物理研究所
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