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

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Keizer, K. and Lansink, G.J. and Burggraaf, A.J. (1978) Anomalous dielectric behaviour of La(III) substituted lead titanate ceramics. Journal of Physics and Chemistry of Solids, 39 (1). pp. 59-63. ISSN 0022-3697

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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.
Item Type:Article
Copyright:© 1978 Elsevier Science
Link to this item:http://purl.utwente.nl/publications/68386
Official URL:http://dx.doi.org/10.1016/0022-3697(78)90201-9
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