Structural and dielectric properties of polycrystalline (Ba0.9Sr0.1)TiO3

• Autorzy: Kajtoch C. , Gabryś M. , Tejchman W. , Handke B.
• Języki publikacji: EN

Abstrakty

EN

Purpose: This work is aimed to determination of the influence of Sr - ferroactive substitution on physical properties and character of phase transitions (PT) in barium titanate BaTiO3 (BT). Design/methodology/approach: Polycrystalline samples of BST-10 were prepared by means of calcination method at the 1600 K. Roentgenogram of BST-10 was made within the angles from 10 deg to 110 deg with the 0.008 deg step. 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 and Agilent Precision LCR meter HP4284A equipped with WinDETA 5.62 software Novocontrol. Measurement were taken under cooling with 2 K/min speed. Measuring electric field frequency was from the range 20 Hz-1 MHz. Findings: Dielectric spectroscopy in the frequency domain was applied to measure complex dielectric permittivity and other dielectric functions of ferroelectric polycrystalline (Ba0.9Sr0.1)TiO3 (BST-10). It was established that 10% substitution of Sr in BST-10 solid solution did not change the character of the phase transitions. The temperatures of the phase transitions were correlated with low temperature of PT in SrTiO3 (ST). Similar properties of Ba and Sr ions were taken into consideration. The dipolar character of solid solution was also observed in paraelectric phase. Practical implications: Obtained results can be used to model the effects of ferroactive and nonferroactive substitutions in the A and B subnets of perovskite ferroelectrics. Originality/value: An attempt to correlate low phase angle values observed in the paraelectric phase of BTS-10 with high dielectric permittivity and the occurrence of polar regions.

Słowa kluczowe

EN

ceramics; ferroelectric; dielectric properties; phase transition; dielectric relaxation spectroscopy

PL

ceramika; ferroelektryki; właściwości dielektryczne; przejścia fazowe

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2008
• Tom: Vol. 33, nr 2
• Strony: 89--92
• Opis fizyczny: Bibliogr. 15 poz.

Twórcy

autor

Kajtoch C.

autor

Gabryś M.

autor

Tejchman W.

autor

Handke B.

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

Bibliografia

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