Dielectric and impedance properties of sintered magnesium aluminum silicate glass-ceramic

作     者：Abhijit PRASAD Amitabha BASU 

作者机构：Department of Applied PhysicsIndian School of MinesDhanbad 826004India 

出 版 物：《Journal of Advanced Ceramics》 (先进陶瓷（英文）)

年 卷 期：2013年第2卷第1期

页      面：71-78页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：glass-ceramic conductivity dielectric properties electrical properties 

摘      要：Magnesium aluminum silicate(MgO-Al_(2)O_(3)-SiO_(2),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 *** 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 *** presence of alkali ions(K+)in MAS glass-ceramic results in higher dielectric constant and higher *** loss(tanδ)seems to be reduced at higher frequencies after reaching the instrumental saturation at 1 *** properties of the material have been studied using a complex impedance spectroscopy(CIS)technique in a wide temperature(30-500℃)and frequency(100 Hz-5 MHz)*** complex impedance plots reveal the contribution of bulk as well as grain boundary effects in *** 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)*** smaller activation energy(Ea)of the compound within moderate temperature range suggests the presence of ions(K^(+)and F^(-))and singly ionized oxygen vacancies in the conduction *** 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.