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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Thermal Induced Structural and Dielectric Anomalies in Calcium Modified Lead Titanate Ceramics

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Estrada, F. R. [1] ; Mascarenhas, Y. P. [2] ; Eiras, J. A. [1] ; Garcia, D. [1]
Total Authors: 4
[1] Univ Fed Sao Carlos, Ferroelect Ceram Grp, BR-13560 Sao Carlos, SP - Brazil
[2] Univ Sao Paulo, Phys Inst Sao Carlos, Grp Crystallog, Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Ferroelectrics; v. 463, n. 1, SI, p. 25-30, APR 26 2014.
Web of Science Citations: 2

Dielectric, structural and pyroelectric properties of the Pb0.525Ca0.475TiO3 (PCT47.5) ceramic system were investigated for temperatures ranging from cryogenic up to 570K. Two anomalies were observed in the temperature dependence of the dielectric permittivity and of the pyroelectric coefficient. A structural refinement study based on the powder XRD data revealed that a distorted perovskite structure with orthorhombic symmetry in space group Pbnm was the best fitting for the entire temperature range analyzed. Nevertheless, the analysis protocol showed that the temperature dependence of the refined lattice parameters is very sensitive to the phase transitions, allowing the association of such transitions to the anomalies observed in the electric properties. (AU)

FAPESP's process: 08/04025-0 - Nanostructured multifunctional multiferroic materials: synthesis, properties, phenomenology and applications
Grantee:José Antonio Eiras
Support type: Research Projects - Thematic Grants