Evolution of electric polarization in paraelectric phase of BaTiO3

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

Abstrakty

EN

Purpose: The aim of this work has been to study electric properties of polycrystalline BaTiO3 (BT) at paraelectric phase. On the basis of the obtained results mechanism of dipolar polarization has been discussed. Design/methodology/approach: Polycrystalline samples of barium titanate were prepared using calcinations method, at the temperature about 1670 K. Dielectric measurements were carried out by means of Quatro Cryosystem 4.0 and Agilent Precision LCR meter HP4284A equipped with WinDETA 5.62 software Novocontrol. The samples were refreshed before measurements by annealing at 700 K. The dielectric measurements were carried out within the frequency range 20 Hz - 1 MHz under cooling with 2 K/min speed. Findings: The results show occurrence of maxims of dielectric permittivity (ε') and phase angle (Φ) within the "cross – over" region. The temperatures related to these maxims depend on the frequency of electric field and are higher for higher frequencies. A positive temperature coefficient (PTC) of conductivity has been found in paraelectric phase of BT. Research limitations/implications: It has been postulated, on the basis of the obtained results, that at the temperatures above 400 K (paraelectric phase) two types of polarization exist in BT: the polarization due to free dipoles (Pf) and the polarization (Pd) related to polar clusters formed by the dipoles. Originality/value: The results confirm existence of two types of polarization in paraelectric phase of BaTiO3.

Słowa kluczowe

EN

ferroelectrics; ceramics; electrical properties; phase transition; polarization

PL

ferroelektryki; ceramika; właściwości elektryczne; przejścia fazowe; polaryzacja

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2008
• Tom: Vol. 33, nr 2
• Strony: 79--82
• Opis fizyczny: Bibliogr. 17 poz.

Twórcy

autor

Bąk W.

autor

Kajtoch C.

autor

Starzyk F.

autor

Żmija J.

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

Bibliografia

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