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.