Anomalous dielectric behaviour of La(III) substituted lead titanate ceramics

K. Keizer, G.J. Lansink, A.J. Burggraaf

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Abstract

In La(III) substituted PbTiO3 ceramics the behaviour of the reciprocal dielectric constant in the paraelectric phase can be described by the relation [...] with the exponent 1 γ<2 depending on the composition. This γ-value is an intermediate of values for Curie-Weiss behaviour (γ = 1) and of values connected with diffuse phase transitions (γ = 2) and increases with increasing La(III) concentration.An excellent agreement between experimental and calculated permittivity curves in the paraelectric phase can be achieved using an alternative equation consisting of a linear and a quadratic term with coefficients varying systematically with the composition. The last equation can be derived and interpreted by means of a physical model assuming the existence of heterophase fluctuations.
Original languageEnglish
Pages (from-to)59-63
JournalJournal of physics and chemistry of solids
Volume39
Issue number1
DOIs
Publication statusPublished - 1978

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Permittivity
Lead
ceramics
permittivity
Chemical analysis
Phase transitions
exponents
curves
coefficients
lead titanate

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Keizer, K. ; Lansink, G.J. ; Burggraaf, A.J. / Anomalous dielectric behaviour of La(III) substituted lead titanate ceramics. In: Journal of physics and chemistry of solids. 1978 ; Vol. 39, No. 1. pp. 59-63.
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Anomalous dielectric behaviour of La(III) substituted lead titanate ceramics. / Keizer, K.; Lansink, G.J.; Burggraaf, A.J.

In: Journal of physics and chemistry of solids, Vol. 39, No. 1, 1978, p. 59-63.

Research output: Contribution to journalArticleAcademic

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AU - Keizer, K.

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N2 - In La(III) substituted PbTiO3 ceramics the behaviour of the reciprocal dielectric constant in the paraelectric phase can be described by the relation [...] with the exponent 1 γ<2 depending on the composition. This γ-value is an intermediate of values for Curie-Weiss behaviour (γ = 1) and of values connected with diffuse phase transitions (γ = 2) and increases with increasing La(III) concentration.An excellent agreement between experimental and calculated permittivity curves in the paraelectric phase can be achieved using an alternative equation consisting of a linear and a quadratic term with coefficients varying systematically with the composition. The last equation can be derived and interpreted by means of a physical model assuming the existence of heterophase fluctuations.

AB - In La(III) substituted PbTiO3 ceramics the behaviour of the reciprocal dielectric constant in the paraelectric phase can be described by the relation [...] with the exponent 1 γ<2 depending on the composition. This γ-value is an intermediate of values for Curie-Weiss behaviour (γ = 1) and of values connected with diffuse phase transitions (γ = 2) and increases with increasing La(III) concentration.An excellent agreement between experimental and calculated permittivity curves in the paraelectric phase can be achieved using an alternative equation consisting of a linear and a quadratic term with coefficients varying systematically with the composition. The last equation can be derived and interpreted by means of a physical model assuming the existence of heterophase fluctuations.

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