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Dielectric properties of polycrystalline (Ba0.40Sr0.60)O3

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EN
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Purpose: Purpose of this paper is to qualify of the degree and the causes of broadening of the phase transition in the polycrystalline solid solution (Ba0.40Sr0.60)TiO3 (BS60T). Design/methodology/approach: Polycrystalline samples of (Ba0.40Sr0.60)TiO3 (BS60T) were prepared by calcinations method at temperature 1570K. Images of the morphology of the samples were taken by means of electron microscope Philips SEM 525M at room temperature. Dielectric measurements were performed with application of Quatro Cryosystem 4.0 Agilent Precision LRC meter HP4824A equipped with WinDETA 5.62 software Novocontrol. Measurements were taken under cooling with 2K/min speed. Measuring electric field frequency was from the range 20 Hz - 1 MHz. Findings: The dielectrometry was applied to measure complex dielectric permittivity and other dielectric functions of ferroelectric (BS60T). It was affirmed, that 60% substitution of Sr ions changed the type of phase transition. Weak dependence of temperature Tm=208 K (temperature of maximum electric permittivity &epsilon') on frequency of the external electric field testifies about diffused character of the phase transition (DPT). The polar character of this material was also observed in the paraelectric phase (to 360 K). This observation is connected with the occurrence of polar clusters in this phase. Research limitations/implications: Results can be used in order to describe the phase transition modifications in the solid solutions with ferroactive substitutions in sublattice B of the perovskite. Originality/value: Value of this work relies on the experimental examination of the electric properties of BS60T solid solution. The low value of phase angle in the paraelectric phase is connected with the occurrence of the polar regions (clusters).
Słowa kluczowe
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Strony
33--36
Opis fizyczny
Bibliogr. 17 poz.
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autor
autor
autor
autor
autor
autor
  • Institute of Physics, Pedagogical University, ul. Podchorążych 2, 30-084 Kraków, Poland, ckajtoch@ap.krakow.pl
Bibliografia
  • [1] Landolt-Boernstein, New Series 3, Vol. 3, Springer-Verlag, Berlin-Heidelberg-New York, 1969.
  • [2] C. Kajtoch, Dissertation A, Halle-Wittenberg (1990) (in German).
  • [3] W. Bąk Characterization of Ba1-xNaxTi1-xNbx ceramic by dielectric spectroscopy, Archives of Materials Science and Engineering 34/1 (2008) 5-8.
  • [4] M. Gabryś, Dielectric properties of polycrystalline (Ba0.60Sr0.40)O3, Archives of Materials Science and Engineering 34/1 (2008) 27-30.
  • [5] C. Kajtoch, M. Gabryś, W. Tejchman, B. Handke, Structural and dielectric properties of polycrystalline (Ba0.9Sr0.1)TiO3, Archives of Materials Science and Engineering 33 (2008) 89-92.
  • [6] W. Heywang, Barium Titanate as a PTC thermistor, Solid-State Electronics 3 (1961) 51-55.
  • [7] G.H. Jonker, Some aspects of semiconducting barium titanate, Solid-State Electronics 7 (1964) 895-899.
  • [8] R. Comes, M. Lambert, A. Guinier, The chain structure of BaTiO3 and KNbO3, Solid State Communication 6 (1968) 715-719.
  • [9] K. Itoh, L.Z. Zeng, E. Nakamura, N. Mishima, Crystal structure of BaTiO3 in the cubic phase, Ferroelectrics 63 (1985) 29-37.
  • [10] G. Burns, F.H. Dacol, Polarization in the cubic phase of BaTiO3, Solid State Communication, 42 (1982) 9-12
  • [11] C. Kajtoch, Dipolar polarisation in Ba(Ti1-xSnx)O3, Ferroelectrics 172 (1995) 465-468.
  • [12] W. Bąk, C. Kajtoch, F. Starzyk, J. Żmija, Evolution of electric polarisation in paraelectric phase of BaTiO3, Archives of Materials Science and Engineering 33 (2008) 79-82.
  • [13] N. Ichinose, Y. Yokomizo, T. Takahashi, The behaviour of the micro domains on the diffuse phase transition ferroelectrics, Acta Crystallographica A28/4 (1972) 187-191.
  • [14] C. Kajtoch, Electric properties of polycrystalline Pb(Cd1/3Nb2/3)O3, Ferroelectrics Letters 25 (1999) 81-85.
  • [15] J. Ravez, A. Simon, Non-Stoichiometric Perovskites Derived from BaTiO3 with a Ferroelectric Relaxor Behaviour, Physica Status Solidi A178 (2000) 793-797.
  • [16] C. Kajtoch, W., Starzyk, M. Gabrys,Study of phase transition specific in polycrystalline Pb(Cd1/3Nb2/3)O3, Archives of Materials Science and Engineering 29/1 (2008) 20-23.
  • [17] C. Kajtoch, Glass-like transformation in Ba(Ti0.70 Sn0.30)O3, Ferroelectrics 192 (1997) 335.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BSL7-0038-0018
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