Dielectric and ferroelectric properties of CoCr_(2)O_(4)nanoceramics  

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作  者:Pankaj Choudhar P.Saxena A.Yadav V.N.Rai A.Mishra 

机构地区:[1]Materials Science Laboratory,School of Physics Vigyan Bhawan,Devi Ahilya University Khandwa Road Campus,Indore 452001,India [2]Department of Physics,Medi-Caps University Pigdamber,Indore 453331,India

出  处:《Journal of Advanced Dielectrics》2019年第3期1-7,共7页先进电介质学报(英文)

基  金:UGC-DAE CSR,as an institute,is acknowledged for extending its facilities and financial assistance(Grant No.:CSRIC/BL-22/CRS-119-2014/269).

摘  要:CoCr_(2)O_(4)nanoceramics are prepared by sol-gel auto combustion method.Synchrotron X-ray diffraction analysis affirms the singlephasepristine cubic structure with space group Fd3m.Debye-Scherrer method estimates the crystallite size of main intense peak tobe~27:15 nm.Prominent bands obtained in infrared spectra at 448 and 599 cm^(-1)are due to metal-oxygen stretching bond presentat tetrahedral and octahedral sites.Dielectric parameters decrease as frequency increases from 103 to 106 Hz that can be interpretedby Maxwell-Wagner-type interfacial polarization.Complex impedance spectra(Nyquist plot)reveal arc like behavior,which ismainly due to intergrain(grain boundary)resistance that also exhibits conducting nature of the nanoceramics.Weak ferroelectricityis mainly associated with the partial reversal of the polarization.Leakage current behavior follows the Ohmic and Child square law.Electron conduction process was interpreted by space-charge limited current(SCLC)mechanism.Leakage current behaviorobserved in cobalt chromite nanoceramics is mainly attributed to the oxygen vacancies.

关 键 词:CoCr_(2)O_(4)nanoceramics synchrotron X-ray diffraction dielectric spectroscopy electric polarization leakage currentbehavior 

分 类 号:R73[医药卫生—肿瘤]

 

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