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Effect of Semiconductor Element Substitution on the Electric Properties of Barium Titanate Ceramics

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Języki publikacji
EN
Abstrakty
EN
The investigated ceramics were prepared by a solid-state reaction from simple oxides and carbonates with the use of a mixed oxide method (MOM). The morphology of BaTi0.96Si0.04O3 (BTSi04) ceramics was characterised by means of a scanning electron microscopy (SEM). It was found that Si+4 ion substitution supported the grain growth process in BT-based ceramics. The EDS results confirmed the high purity and expected quantitative composition of the synthesized material. The dielectric properties of the ceramics were also determined within the temperature range (ΔT=130-500K). It was found that the substitution of Si+4 ions had a significant influence on temperature behavior of the real (ε’) and imaginary (ε”) parts of electric permittivity as well as the temperature dependence of a.c. conductivity. Temperature regions of PTCR effect (positive temperature coefficient of resistivity) were determined for BTSi04 ceramics in the vicinity of structural phase transitions typical for barium titanate. No distinct maximum indicating a low-temperature structural transition to a rhombohedral phase in BTSi04 was found. The activation energy of conductivity was determined from the Arrhenius plots. It was found that substitution of Si ions in amount of 4wt.% caused almost 50% decrease in an activation energy value.
Twórcy
  • Pedagogical University, Institute of Engineering, 2 Podchorążych Str., 30-084 Cracow, Poland
  • University of Silesia in Katowice, Institute of Technology and Mechatronics, 12 Żytnia Str., 41-200, Sosnowiec, Poland
autor
  • University of Silesia in Katowice, Institute of Technology and Mechatronics, 12 Żytnia Str., 41-200, Sosnowiec, Poland
autor
  • Pedagogical University, Institute of Physics, 2 Podchorążych Str., 30-084 Cracow, Poland
Bibliografia
  • [1] E. Brzozowski, M.S. Castro, Synthesis of barium titanate improved by modifications in the kinetics of the solid state reaction, J. Eur. Ceram. Soc. 20, 2347-2355 (2000).
  • [2] C. Saburi, Semiconducting bodies in the family of barium titanate, J. Am. Ceram. Soc. 44, 54-63 (1961).
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  • [5] B. Garbarz-Glos, D. Sitko, A. Budziak, K. Bormanis, M. Antonova, G. Klimkowski, W. Śmiga, The electrical properties of Ba1-ySryZrxTi1-xO3 solid solution, Ferroelectrics. 424, 36-41 (2011).
  • [6] L. Pauling, The nature of the chemical bond and structure of molecules and crystals, Cornel University Press 1969.
  • [7] K. Tkacz-Śmiech, A. Koleżyński, W.S. Ptak, Chemical bond in ferroelectric perovskites, Ferroelectrics. 237, 57-64 (2000).
  • [8] K.Tkacz Śmiech, A. Koleżyński, W.S. Ptak, Crystal-chemical aspects of phase transition in barium titanate, Solid State Commun. 127, 557-562 (2003).
  • [9] A. Koleżyński, K. Tkacz-Śmiech, From the molecular picture to the band structure of cubic and tetragonal barium titanate, Ferroelectrics. 314, 123-134 (2005).
  • [10] W. Heywang, Barium Titanate as a PTC thermistor, Solid State Electron. 3, 51-58 (1961).
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  • [12] T. Holstein, Studies of polaron motion, Ann. Phys. 8, 343-389 (1959)
  • [13] H. Böttger, V.V. Bryksin, Hopping conduction in solids, Akademie-Verlag, Berlin 1985.
  • [14] A.S. Aleksandrov, Polarons in advanced materials, Springer Netherlands 2007.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-5e2b6c7b-7fbc-4069-bb17-69364adc8fc2
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