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Mean field behaviour of Sr 1−x Ca x TiO 3
Author(s) -
Chaves M. R.,
Almeida A.,
Maglione M.,
Ribeiro J. L.
Publication year - 1996
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221970225
Subject(s) - dielectric , ferroelectricity , condensed matter physics , field (mathematics) , materials science , boundary (topology) , trace (psycholinguistics) , dielectric function , function (biology) , analytical chemistry (journal) , chemistry , physics , mathematics , mathematical analysis , optoelectronics , chromatography , linguistics , philosophy , evolutionary biology , pure mathematics , biology
A systematic analysis of the dielectric constant as a function of temperature in SrTiO 3 : Ca crystals with Ca content of 0.0020, 0.0032, 0.0055, 0.0058, and 0.0110 shows that the Barrett parameters are clearly modified by the Ca content. We have found for each Ca concentration the temperature below which the contribution of the Ca induced clusters becomes sizeable. The values obtained for the fitted parameters in the Barrett formula allow us to trace a boundary between the low‐temperature quantum paraelectric and ferroelectric regimes.