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首页> 外文期刊>RSC Advances >Electrical conductivity and vibrational studies induced phase transitions in [(C2H5)4N]FeCl4
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Electrical conductivity and vibrational studies induced phase transitions in [(C2H5)4N]FeCl4

机译：电导率和振动研究诱导[（C2H5）4N] FeCl4中的相变

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摘要

The compound, tetraethylammonium tetrachloroferrate [(C _(2) H _(5) ) _(4) N]FeCl _(4) , was prepared by slow evaporation at room temperature. It was characterized by X-ray powder diffraction, thermal analysis, and impedance and vibrational spectroscopy. X-ray diffraction data confirmed formation of a single phase material which crystallized at room temperature in the hexagonal system ( P 6 _(3) mc space group). DSC showed the existence of two phase transitions at 413 K and 430 K. Electrical conductivity was measured in the temperature and frequency ranges of 390 K to 440 K and 40?Hz to 110 MHz, respectively. Nyquist plots revealed the existence of grains and grain boundaries that were fitted to an equivalent circuit. AC conductivity plots were analyzed by Jonscher's power law. Variations in the “ s ” values indicated that CBH models describe the conduction mechanism in regions I and II. Temperature dependence of Raman spectra showed that the most important changes were observed in the cationic parts ([(C _(2) H _(5) ) _(4) N] ~(+) ). The activation energy value obtained from the line width decreased which indicated an order–disorder model.
机译：通过在室温下缓慢蒸发来制备四氯高铁酸四乙铵[（C _（2）H _（5））_（4）N] FeCl _（4）。它的特征在于X射线粉末衍射，热分析以及阻抗和振动光谱学。 X射线衍射数据证实了六方体系（P 6 _（3）mc空间群）中在室温下结晶的单相材料的形成。 DSC显示在413 K和430 K存在两个相变。分别在390 K至440 K和40？Hz至110 MHz的温度和频率范围内测量电导率。奈奎斯特图显示了存在于等效电路中的晶粒和晶界。交流电导率图通过Jonscher幂定律进行分析。 “ s”值的变化表明CBH模型描述了区域I和II中的传导机制。拉曼光谱的温度依赖性表明，在阳离子部分（[[C _（2）H _（5）__（4）N]〜（+））中观察到最重要的变化。从线宽获得的活化能值降低，这表明有序-无序模型。

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