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Electrical transport in lead-free Na_(0.5_Bi_(0.5)TiO_(3) ceramics

Journal of Advanced Ceramics 2021年第1期10卷 152-165页

作者： J.SUCHANICZ k.kluczewska-CHMIELARZ D.SITkO G.JAGLO Institute of Technology Pedagogical Universityul.Podchorazych 230-084 KrakowPoland Institute of Physics Pedagogical Universityul.Podchorazych 230-084 KrakowPoland

Lead-free Na_(0.5_Bi_(0.5)TiO_(3) (NBT)ceramics were prepared via a conventional oxide-mixed sintering route and their electrical transport properties were *** current(DC,σDC)and alternating current(AC,σAc)electrical conductivity values,polarization current(first measurements)and depolarization current,current-voltage(I-U)characteristics(first measurements),and the Seebeck coefficient(a)were determined under various *** mechanism of depolarization and the electrical conductivity phenomena observed for the investigated samples were found to be *** low voltages,the I-U characteristics were in good agreement with Ohm^law;for higher voltages,the observed dependences were I-U^(2),1-U^(4),and then I-U^(6).The low-frequencyσAC followed the formulaσAC-ω^(s)(ωis the angular frequency and 5 is the frequency exponent).The exponent s was equal to 0.18-0.77 and 0.73-0.99 in the low-and high-frequency regions,respectively,and decreased with temperature *** was shown that conduction mechanisms involved the hopping of charge carriers at low temperatures,small polarons at intermediate temperatures,and oxygen vacancies at high *** on AC conductivity data,the density of states at the Fermi-level,and the minimum hopping length were *** conduction was found to undergo p-n-p transitions with increasing *** transitions occurred at depolarization temperature 7d,280℃,and temperature of the maximum of electric permittivity Tm is as typical of NBT materials.

关键词： Na05Bi05TiO3(NBT)ceramics electrical properties Seebeck coefficient impedance spectroscopy

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Electrical transport in low-lead (1-x)BaTiO_(3)–xPbMg_(1/3)Nb_(2/3)O_(3) ceramics

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Journal of Advanced Ceramics 2017年第3期6卷 207-219页

作者： J.SUCHANICZ k.kONIECZNY k.SWIERCZEk M.LIPINSkI M.kARPIERZ D.SITkO H.CZTERNASTEk k.kluczewska Institute of Technology Pedagogical Universityul.Podchorazych 230-084 KrakowPoland Department of Hydrogen Energy Faculty of Energy and FuelsAGH University of Science and Technologyal.Mickiewicza 3030-059 KrakowPoland Institute of Metallurgy and Materials Science Polish Academy of Sciencesul.Reymonta 2530-059 KrakowPoland Institute of Physics Pedagogical Universityul.Podchorazych 230-084 KrakowPoland

Low-lead (1-x)BaTiO3–xPbMg1/3Nb2/3O3 ceramics (x = 0, 0.025, 0.05, 0.075, 0.1, and 0.15) were prepared by the conventional oxide mixed sintering process, and their optical band gap, Seebeck coefficient, ac ( σac ) and dc ( σdc ) conductivities as a function of temperature were investigated for the first time. It was found that all samples have p-type conductivity. The low-frequency (20 Hz–2 MHz) ac conductivity obeys a power law σac ~ ωs , which is characteristic for disordered materials. The frequency exponent s is a decreasing function of temperature and tends to zero at high temperature. σac is proportional to ω0.07 – ω0.31 in the low-frequency region and to ω0.51 – ω0.98 in the high-temperature region. The temperature dependence of the dc conductivity showed a change in slope around the temperature at which the phase transition appeared. Both ac and dc conductivities showed a thermally activated character and possessed linear parts with different activation energies and some irregular changes. It was found that the hopping charge carriers dominate at low temperature and small polarons and oxygen vacancies dominate at higher temperature. (1-x)BaTiO3–xPbMg1/3Nb2/3O3 ceramics are expected to be promising new candidate for low-lead electronic materials.

关键词： BT-PMN ceramics electric properties Seebeck coefficient

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