Mild Hydrothermal-Reduction Synthesis and Mössbauer Study of Low-Dimensional Iron Chalcogenide Microcrystals and Single Crystals
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- 作者：Yi Xie ; Liying Zhu ; Xuchuan Jiang ; Jun Lu ; Xiuwen Zheng ; Wei He ; and Yuzhi Li
- 刊名：Chemistry of Materials
- 出版年：2001
- 出版时间：November 2001
- 年：2001
- 卷：13
- 期：11
- 页码：3927 - 3932
- 全文大小：230K
- 年卷期：v.13,no.11(November 2001)
- ISSN：1520-5002
文摘
Low-dimensional iron chalcogenide Fe7S8 and FeSe2 microcrystals and FeTe2 bulk singlecrystals were synthesized via the reactions of FeCl3 with S or Se or Te powders in hydrazinehydrate solution (85%, v/v) at 140 
C for 36 h. The products were characterized by means ofX-ray powder diffraction, rocking curve, transmission electron microscopy, electron diffraction, and scanning electron microscopy techniques. In the reaction process, hydrazine hydratecan coreduce Fe3+ and elemental chalcogen to Fe2+ and chalcogen anions, respectively, thecombination of which can lead to the reaction proceeding completely. The morphologies ofthe products are affected by the temperature, pressure, and pH values. Moreover, a suitablespeed of decreasing the temperature and proper supersaturation are two important factorsin the formation of single-crystal FeTe2. Mössbauer spectra show the magnetism of Fe7S8and nonmagnetic properties for FeSe2 and FeTe2 at room temperature.
C for 36 h. The products were characterized by means ofX-ray powder diffraction, rocking curve, transmission electron microscopy, electron diffraction, and scanning electron microscopy techniques. In the reaction process, hydrazine hydratecan coreduce Fe3+ and elemental chalcogen to Fe2+ and chalcogen anions, respectively, thecombination of which can lead to the reaction proceeding completely. The morphologies ofthe products are affected by the temperature, pressure, and pH values. Moreover, a suitablespeed of decreasing the temperature and proper supersaturation are two important factorsin the formation of single-crystal FeTe2. Mössbauer spectra show the magnetism of Fe7S8and nonmagnetic properties for FeSe2 and FeTe2 at room temperature.