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Investigation on electrical conductivity and dielectric property of La_(0.8)Pb_(0.2)(Fe,Ti)_(0.5)O_(3)ceramic nanoparticles

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Journal of Advanced Dielectrics 2019年第4期9卷 24-29页

作者： D.Triyono Y.Supriyadi H.Laysandra Department of Physics Faculty of Mathematics and Natural Science(FMIPA)Universitas Indonesia Depok 16424Indonesia Department of Physics National Taiwan Normal University Taipei 11677Taiwan

The modification of the structure lanthanum orthoferrites(LaFeO_(3))to obtain ceramic materials with enhanced structural,optical,and electrical properties constitutes an active area of *** preparation of La_(0.8)Pb_(0.2)(Fe,Ti)_(0.5)O_(3)(LPFTO)ceramic nanoparticles by following a cation substitution approach from LaFeO_(3)using sol–gel and sintering methods is *** electrical and dielectric properties of the obtained material are *** contribution of grain and grain boundary in the conduction mechanism is demonstrated by complex impedance *** LPFTO ceramic nanoparticles exhibit a giant dielectric constant of the order of *** conductivity analysis suggests the occurrence of thermally activated semiconductor ***,the ferromagnetic–paramagnetic semiconductor transition temperature is observed at 385 *** ac conductivity behavior satisfies the nonoverlapping small-polaron tunneling(nspt)model.

关键词： La_(0.8)Pb_(0.2)(Fe,Ti)_(0.5)O_(3) impedance spectroscopy dielectric conductivity nspt model

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Dielectric relaxation and conduction mechanism of NaMgPO_(4)compound

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Journal of Advanced Dielectrics 2022年第3期12卷 1-10页

作者： L.Miladi A.Oueslati M.Ben Gzaiel M.Gargouri Laboratory of Spectroscopic Characterization and Optical Materials Faculty of Sciences University of Sfax B.P.11713000 SfaxTunisia

The polycrystalline NaMgPO_(4)ceramic,synthesized via a high-temperature solid-state reaction route,has been characterized by using different experimental *** X-ray powder diffraction confirmed the phase formation of the synthesized com-pound in the orthorhombic *** assumed an olivine-type structure made up of corners linked between tetrahedral PO_(4)and octahedral NaO_(6)and MgO_(6)*** and Raman spectroscopies confirmed the presence of PO_(4)^(3−)*** structure and chemical bonding between MgO_(6)octahedral and PO_(4)3−tetrahedral groups investigated by diffusion Raman is the feature in the phase transition at T=693 *** temperature dependences of the realε′and imaginaryε″parts of dielectric permittivity show a distribution of relaxation *** Nyquist plots,the presence of grain and grain boundary effect in the material is *** impedance spectroscopy measurement showed a non-Debye-type *** the impedance data,the determined grain resistance reduces with increment of temperature showing negative temperature coefficient of resistance(NTCR)-type nature of the material which also confirmed from conductivity *** temperature dependence ofσdc reveals an Arrhenius-type behavior with two activation energies,0.98 eV in region I and 0.67 eV in region *** sample’s conduction is assured by Na+ions’hopping in tunnels and its mechanism was discussed.

关键词： Sodium-magnesium orthophosphate Raman phase transition nspt model sodium-ion conductivity

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