Evidence of a third kind of Johnscher’s like universal dielectric response
作者机构：Department of Physics Dr.Harisingh Gour Vishwavidyalaya(A Central University)SagarMadhya Pradesh 470003India
出 版 物：《Journal of Advanced Dielectrics》 (先进电介质学报（英文）)
年 卷 期：2018年第8卷第4期
页 面：43-48页
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
主 题：Dielectric losses dielectric materials dielectric measurements dielectric polarization frequency response image analysis impedance measurement polymers relaxation processes spectroscopy
摘 要：Polymer/metal composites(PMC)comprising of polyvinylidene fluoride/nanocrystalline nickel with varying volume fractions of nickel(fcon)prepared under cold press show an insulator to metal transition(IMT)at percolation threshold(f_(c)=f_(con)=0:27).The two kinds of generalized Johnscher’s universal dielectric response(UDR)laws on both sides of IMT hold good,while for the percolative sample,none of the two laws hold *** the concept of dipolar relaxation nor anomalous low frequency dispersion stands valid for f_(c)=0:27,while a completely different,neutral and competing electrical behavior is observed over the entire range of *** emerged third kind of Johnscher’s like UDR for fc is observed and the relaxation law has been formulated as the ratio of imaginary and real parts of dielectric constant remains constant over the entire range of frequency starting from dc to any higher *** value of the constant is attributed to depend on the PMC,the dielectric constant of the polymer,the differences of conductivity and fractions of the components of the PMC and also on their connectivity arising due to the difference of their process *** emerged unique dielectric relaxation consists of multiple relaxations arising due to the combination of other relaxations(arising due to the two different types of species)present in the sample,f_(con)=0:*** novel material may be suitable for certain specific applications in electrical and electronics engineering.
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