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《Journal of Hubei University(Natural Science)》 2018-01
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Effect of grain boundary segregation on dielectric properties of CaCu_3Ti_4O_(12) ceramics

YANG Jingpeng;XU Lingfang;WANG Ruilong;XIAO Haibo;YANG Fujun;V V Marchenkev;YANG Changping;Faculty of Physics and Electronic Science,Hubei University;Institute of Metal Physics,Ural Branch of Russian Academy of Sciences;  
The polarizability of dielectric material is sensitive to microstructures,including grain size,grain boundary and the segregationphase at grain boundary.In this work,ceramic Ca Cu_3Ti_4O_(12)was prepared by sol-gel method with a post ball milling.The influence of milling treatment on dielectric properties of Ca Cu_3-Ti_4O_(12)ceramics was investigated.Experimental results indicate that the dielectric constant of Ca Cu_3Ti_4O_(12)ceramic sample is greatly affected by the ball milling.The dielectric constant of Ca Cu_3Ti_4O_(12)increases with increasing the milling time,obviously.When the milling time is 4 hours,the constant can reach a value of10~6,much higher than that of the untreated sample.The dielectric constant increases by an order of magnitude with increasing temperature by 100 K.Besides,SEM analysis indicates that the increase of the dielectric constant is related to the grain boundary segregation of Ca Cu_3Ti_4O_(12),especially the secondary phase of Cu O precipitated at grain boundaries can greatly enhance the polarization of Ca Cu_3Ti_4O_(12)by around two order of magnitude.
【Fund】: 国家自然科学基金(11674086 51402094)资助
【CateGory Index】: TQ174.1
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