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

• Autorzy: Kajtoch C. , Bąk W. , Gabryś M. , Mroczka K. , Starzyk F. , Żmija J.
• Języki publikacji: EN

Abstrakty

EN

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

EN

ferroelectric; solid solution

PL

ferroelektryk; roztwór stały

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2009
• Tom: Vol. 40, nr 1
• Strony: 33--36
• Opis fizyczny: Bibliogr. 17 poz.

Twórcy

autor

Kajtoch C.

autor

Bąk W.

autor

Gabryś M.

autor

Mroczka K.

autor

Starzyk F.

autor

Żmija J.

• Institute of Physics, Pedagogical University, ul. Podchorążych 2, 30-084 Kraków, Poland,

Bibliografia

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