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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.)

Dielectric Study at Microwave Frequencies of Phase Transitions in Multiferroic Ceramics

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Author(s):
Fraygola, B. [1] ; Coelho, Adelino A. [2] ; Eiras, J. A. [1]
Total Authors: 3
Affiliation:
[1] Univ Fed Sao Carlos UFSCar, Dept Fis, Grp Ceram Ferroeletr GCFerr, BR-13565670 Sao Carlos, SP - Brazil
[2] Univ Estadual Campinas, UNICAMP, Inst Fis Gleb Wataghin IFGW, Dept Fis DFA, Lab Preparacao & Caracterizacao Mat, Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 16, n. 5, p. 1134-1139, SEP-OCT 2013.
Web of Science Citations: 0
Abstract

Multiferroic ceramic solid solutions between the ferroelectric relaxor Pb(Fe2/3W1/3)O-3 (PFW) and ``normal{''} ferroelectric PbTiO3 (PT) - PFW-PT have been synthesized by a modified B-site precursor method and characterized by microwave dielectric measurements. A dielectric dispersion occurring in the frequency range of 100MHz-3GHz and in a broad range of temperatures showed to be a powerful tool to detect electrostrictive and magnetostrictive effects. Anomalies in the temperature dependence of the dielectric parameters (f(R) (characteristic frequency) and the dielectric strength Delta epsilon (characteristic of the dispersion)) have been observed at T-N and T-C for all samples, indicating that the coupling between the ferroelectric and antiferromagnetic orders occurs ``via strain{''} and confirming the high sensitivity of microwave dielectric measurements to probe weak transitions in bulk ceramics. (AU)

FAPESP's process: 10/11187-6 - Determination of the magnetoelectric coupling coefficient in single phase multiferroic materials
Grantee:Barbara Maraston Fraygola
Support type: Scholarships in Brazil - Post-Doctorate
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