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*** and relaxation dynamics in zinc-borate glasses

Progress in Natural Science:Materials International 2012年第2期22卷 86-93页

作者： Ghada E.El-Falaky Osiris W.Guirguis Nadia S.Abd El-Aal Biophysics Department Faculty of ScienceCairo UniversityEl-Giza 12613Egypt Ultrasonic Laboratory National Institute for StandardsTersa StreetP.O.Box 136El-HaramEl-Giza 12211Egypt

The frequency-dependent dielectric dispersion of ZnO-Na2O-Al2O3-B2O3(in mol%) glass prepared by the melt quenching technique is investigated in the temperature ranges from room temperature to 420 *** relaxation has been analyzed based on the behavior of electric modulus *** analysis of the real and imaginary parts of dielectric is performed assuming the ideal Debye behavior as confirmed by Cole-Cole *** activation energy associated with the dielectric relaxation determined from the electric modulus spectra was found to be 1.863 eV,which is close to that the activation energy for ***(1.871 eV),indicating the similar nature of relaxation and conductivity.

关键词： Zinc-borate glasses A.C.conductivity Dielectric properties impedance properties

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Electrical properties of Y-type hexaferrite

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Journal of Advanced Dielectrics 2018年第3期8卷 88-95页

作者： Bibhuti B.Sahu S.K.Patri Banarji Beheray B.Maharanay Department of Physics Veer Surendra Sai University of TechnologyBurlaSambalpur 768018OdishaIndia Material Research Laboratory School of PhysicsSambalpur UniversityJyoti ViharBurlaSambalpur 768019OdishaIndia

The polycrystalline sample of Ba_(2)Mg_(2)Fe_(12)O_(22) was prepared by solid-state reaction ***-temperature X-ray diffraction(XRD)has confirmed the formation of rhombohedral *** electrical properties of the sample were studied in wide ranges of temperatures and *** impedance analysis indicates the presence of bulk *** bulk resistance of the material decreases with rise in temperature and exhibits NTCR *** compound also exhibits the temperature-dependent non-Debye type of relaxation *** presence of non-Debye type of relaxation has been confirmed by the complex impedance *** variation of DC conductivity(bulk)with temperature demonstrates that the compound exhibits Arrhenius type of electrical *** activation energy of the compound is found to be 0.55 eV in high-temperature region.

关键词： Solid-state reaction X-ray diffraction dielectric properties impedance properties electrical conductivity

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