硅酸盐学报2013，Vol.41Issue(5)：669-673,5.DOI:10.7521/j.issn.0454-5648.2013.05.14
热处理针铁矿的结构与色度演化
Structural and Chromatic Evolution of Goethite by Thermal Treatment
摘要
Abstract
The structural and chromatic evolution of synthesized goethite calcinated in air was analyzed by X-ray powder diffraction, transmission electron microcopy and nitrogen adsorption analysis for specific surface area, respectively. Also, the chromaticity change of goethite was determined by diffuse reflectance spectroscopy. The results show that the orange goethite calcinated at 200 ℃ has the specific surface area of 12.0 m2/g and no phase transformation, and appears red, yellow and orange reflectances. The nanopores were formed when goethite was transformed into hematite at 250 ℃. The maximum specific surface area could be 97.4 m2/g. An orange to red reflectance evolution appeared in the iron oxide mineral, and the total, orange, yellow reflectances declined, and the red reflectance exhibited an elevation. The pore size increased and the specific surface area of hematite decreased with increasing temperature. However, the color characteristics of the product, i.e., the total and other color reflectances, did not vary significantly. The nanopores disappeared and the specific surface area reduced to 2.8 m2/g at > 750 ℃. At the same time, the color of product changed to dark-red, and the orange and yellow reflectances unchanged with the decline of the total and red reflectance. For the preparation of nanoporous materials by calcination, a further study of the chromatic alteration combined with the particle dimensions on hematite formation will be needed.关键词
针铁矿/赤铁矿/色度演化/结构演化/热处理Key words
goethite/ hematite/ chromatic evolution/ structural evolution/ thermal treatment分类
天文与地球科学引用本文复制引用
邹雪华,陈天虎,刘海波,陈冬,张萍,谢巧勤..热处理针铁矿的结构与色度演化[J].硅酸盐学报,2013,41(5):669-673,5.基金项目
教育部博士点基金(No.20110111110003) （No.20110111110003）
国家自然基金(No.41172048)资助项目. （No.41172048）
