BibTeX
@MISC{09archives,
author = {},
title = {Archives},
year = {2009}
}
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Abstract
Received 29.08.2009; published in revised form 01.11.2009 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 ε’) 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
Keyphrases
phase transition design methodology approach maximum electric permittivity external electric field testifies min speed paraelectric phase weak dependence quatro cryosystem diffused character polycrystalline sample electric field frequency polycrystalline solid solution sr ion electron microscope philip sem software novocontrol calcination method polar character revised form dielectric measurement agilent precision lrc meter hp4824a room temperature complex dielectric permittivity dielectric function temperature tm
