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首页> 外文期刊>Journal of Advanced Ceramics >Dielectric and impedance properties of sintered magnesium aluminum silicate glass-ceramic
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Dielectric and impedance properties of sintered magnesium aluminum silicate glass-ceramic

机译：硅酸铝镁玻璃微晶玻璃的介电和阻抗特性

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摘要

Magnesium aluminum silicate (MgO-Al2O3-SiO2, MAS) glass-ceramic was prepared via sintering route. X-ray diffraction (XRD) analysis indicates the formation of multiphase compound with magnesium silicate fluoride and cordierite as major phases. Dielectric studies of the compound shows a strong frequency dispersion of permittivity in the low frequency region followed by a nearly frequency-independent behavior in the high frequency region. The presence of alkali ions (K~+) in MAS glass-ceramic results in higher dielectric constant and higher losses. Dielectric loss (tanS) seems to be reduced at higher frequencies after reaching the instrumental saturation at 1 kHz. Electrical properties of the material have been studied using a complex impedance spectroscopy (CIS) technique in a wide temperature (30-500 °C) and frequency (100 Hz-5 MHz) ranges. The complex impedance plots reveal the contribution of bulk as well as grain boundary effects in it. The bulk resistance, evaluated from complex impedance spectrum, has been observed to decrease with the rise in temperature, showing a typical negative temperature coefficient of resistance (NTCR) behavior. The smaller activation energy (E_a) of the compound within moderate temperature range suggests the presence of ions (K~+ and F~-) and singly ionized oxygen vacancies in the conduction process. The nature of variation of the electrical conductivity, and the values of activation energy of different temperature regions, suggest that the conduction process is of mixed type.
机译：通过烧结法制备了硅酸镁铝（MgO-Al2O3-SiO2，MAS）。 X射线衍射（XRD）分析表明形成了以氟化硅酸镁和堇青石为主要相的多相化合物。该化合物的介电研究表明，介电常数在低频区域的频率分散性很强，随后在高频区域具有几乎与频率无关的行为。 MAS玻璃陶瓷中碱离子（K〜+）的存在导致较高的介电常数和较高的损耗。在1 kHz达到仪器饱和后，介电损耗（tanS）似乎在较高的频率上降低了。已使用复阻抗谱（CIS）技术在较宽的温度（30-500°C）和频率（100 Hz-5 MHz）范围内研究了材料的电性能。复杂的阻抗图揭示了体积以及晶粒边界效应的作用。从复数阻抗谱评估的体电阻已观察到随温度升高而降低，显示出典型的负温度系数电阻（NTCR）行为。该化合物在适中的温度范围内较小的活化能（E_a）表明在传导过程中存在离子（K〜+和F〜-）和单个离子化的氧空位。电导率变化的性质以及不同温度区域的活化能值表明，导电过程是混合型的。

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