Influence of nonstoichiometry on ferroelectric phase transition in BaTiO3

Soonil Lee, Zi-kui Liu, Myong Ho Kim, Clive A. Randall

Research output: Contribution to journalArticle

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Abstract

The ferroelectric phase transition behavior in equilibrated nonstoichiometric BaTi O3 powder samples was characterized by a differential scanning calorimeter. The transition temperature (TC) and enthalpy of transition (Δ H TC) between the paraelectric and ferroelectric phases were varied systematically with defect concentrations through the BaTi ratio, temperature, and oxygen partial pressure [p (O2)]. It was observed that the different defects such as titanium, barium, and oxygen vacancies all contribute to the changes of TC and Δ H TC. The TC decreased with increasing concentration of Ti O2 partial Schottky defects and BaO partial Schottky defects. The annealing temperature increased the TC due to a complex mechanism with the increase of full Schottky defect reactions. In terms of p (O2), TC is constant in the ionic compensation region, and increases with the nonstoichiometry in the electronically compensated p (O2) region.

Original languageEnglish (US)
Article number054119
JournalJournal of Applied Physics
Volume101
Issue number5
DOIs
StatePublished - Mar 23 2007

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defects
temperature ratio
oxygen
barium
calorimeters
partial pressure
titanium
enthalpy
transition temperature
annealing
scanning
temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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abstract = "The ferroelectric phase transition behavior in equilibrated nonstoichiometric BaTi O3 powder samples was characterized by a differential scanning calorimeter. The transition temperature (TC) and enthalpy of transition (Δ H TC) between the paraelectric and ferroelectric phases were varied systematically with defect concentrations through the BaTi ratio, temperature, and oxygen partial pressure [p (O2)]. It was observed that the different defects such as titanium, barium, and oxygen vacancies all contribute to the changes of TC and Δ H TC. The TC decreased with increasing concentration of Ti O2 partial Schottky defects and BaO partial Schottky defects. The annealing temperature increased the TC due to a complex mechanism with the increase of full Schottky defect reactions. In terms of p (O2), TC is constant in the ionic compensation region, and increases with the nonstoichiometry in the electronically compensated p (O2) region.",
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Influence of nonstoichiometry on ferroelectric phase transition in BaTiO3 . / Lee, Soonil; Liu, Zi-kui; Kim, Myong Ho; Randall, Clive A.

In: Journal of Applied Physics, Vol. 101, No. 5, 054119, 23.03.2007.

Research output: Contribution to journalArticle

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T1 - Influence of nonstoichiometry on ferroelectric phase transition in BaTiO3

AU - Lee, Soonil

AU - Liu, Zi-kui

AU - Kim, Myong Ho

AU - Randall, Clive A.

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AB - The ferroelectric phase transition behavior in equilibrated nonstoichiometric BaTi O3 powder samples was characterized by a differential scanning calorimeter. The transition temperature (TC) and enthalpy of transition (Δ H TC) between the paraelectric and ferroelectric phases were varied systematically with defect concentrations through the BaTi ratio, temperature, and oxygen partial pressure [p (O2)]. It was observed that the different defects such as titanium, barium, and oxygen vacancies all contribute to the changes of TC and Δ H TC. The TC decreased with increasing concentration of Ti O2 partial Schottky defects and BaO partial Schottky defects. The annealing temperature increased the TC due to a complex mechanism with the increase of full Schottky defect reactions. In terms of p (O2), TC is constant in the ionic compensation region, and increases with the nonstoichiometry in the electronically compensated p (O2) region.

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