Hexagonal hematite platelets synthesized from pyrite cinders by hydrothermal process |
| |
Authors: | Zhao-cheng Liu and Ya-jie Zheng |
| |
Affiliation: | (1) Corporate R&D, LG Chemical Ltd., Research Park, 104-1, Moonji-dong, Yuseong-gu, Daejeon, 305-380, South Korea;(2) Department of Inorganic Materials Engineering, College of Engineering, Paichai University, Daejeon, South Korea;(3) Department of Inorganic Materials Engineering, Hanyang University, Seoul, Korea |
| |
Abstract: | Well-crystallized hexagonal hematite (α-Fe2O3) platelets were synthesized by hydrothermal process, using a highly concentrated ferric hydroxide as precursor. The precursor
was prepared by adding ammonia to the ferric sulfate solution which was obtained by leaching pyrite cinders with sulfuric
acid. Structure and morphology of the synthesized products were investigated by X-ray diffraction, scanning electron microscope,
transmission electron microscope and selected area electron diffraction. The results reveal that the reaction temperature
has significant effects on the structure, size and shape of the synthesized hematite particles. Typical hexagonal hematite
platelets, about 0.4–0.6 μm in diameter and 0.1 μm in thickness, were prepared at 230 °C for 0.5 h. Al3+, contained in the sulfuric acid leaching solution as an impurity, plays an extremely important role in the formation of hexagonal
hematite. In addition, a possible mechanism about the formation of hexagonal hematite platelets was proposed. |
| |
Keywords: | hematite α-Fe2O3 pyrite cinders hydrothermal process hexagonal platelets |
本文献已被 CNKI 维普 SpringerLink 等数据库收录! |
|