K3Fe(CN)6: Pressure-Induced Polymerization and Enhanced Conductivity

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• 作者：Kuo Li ; Haiyan Zheng ; Ilia N. Ivanov ; Malcolm Guthrie ; Yuming Xiao ; Wenge Yang ; Chris A. Tulk ; Yusheng Zhao ; Ho-kwang Mao
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：November 21, 2013
• 年：2013
• 卷：117
• 期：46
• 页码：24174-24180
• 全文大小：416K
• 年卷期：v.117,no.46(November 21, 2013)
• ISSN：1932-7455

文摘

Recent theoretical studies indicate that applying high pressure (up to tens of gigapascals) to simple compounds with triple bonds can convert the triple bonds to conjugated double bonds, which results in these compounds becoming electrically conductive or even superconductive. This might indicate a new route for the synthesis of inorganic/organic conductors of various compositions and properties and could greatly expand the field of conductive polymers. Here, we present a study of the phase behavior and electrical properties of K₃Fe(CN)₆ up to 15 GPa using Raman spectroscopy, synchrotron X-ray diffraction, and impedance spectroscopy at room temperature. In this pressure range, two new crystalline phases were identified, and their unit cells and space groups were determined. The cyanide ions react to form conjugated C鈺怤 bonds in two steps, and the electronic conductivity is enhanced by 3 orders of magnitude, from 10^鈥? to 10^鈥? S路cm^鈥?. Because this material is also an ionic conductor, these studies might 鈥渟hed light鈥?on the development of new cathode materials for alkali metal batteries. Enhancing the electrical conductivity by applying high pressure to compounds containing triple bonds could provide a potential route for synthesizing multifunctional conductive materials.