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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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