Crossref journal-article
AIP Publishing
Journal of Applied Physics (317)
Abstract

With the purpose of fabricating ceramics where ferroelectric and magnetic order coexist, ceramics of Pb(Fe1∕2Nb1∕2)O3 have been prepared using the traditional ceramic method following three different routes. The first is a direct via starting from oxide reagents and the other two use different kinds of FeNbO4 precursors with either monoclinic or orthorhombic structures. Crystallographic and surface morphological studies were carried out by the powder x-ray diffraction and scanning microscopy techniques. The presence of Fe2+, detrimental to the ferroelectric and magnetic performance, was evaluated by x-ray photoelectron spectroscopy. The samples showed no structural differences, uniformly distributed grains, a ferro-paraelectric transition temperature at 110°C and a normal diffuse phase transition (nonrelaxor behavior). Differences in the degree of diffuseness, densities and grain size were observed depending on the kind of precursor. Measurements of dc and ac electrical resistivity, dielectric constant and dielectric loss were made as functions of temperature from room temperature to 250°C, at different frequency values (between 20Hz and 1MHz). Four conduction mechanisms were identified: hopping charge corresponding to low temperatures, small polarons and oxygen vacancies conduction at intermediate temperatures, and intrinsic ionic conduction at high temperatures. The best set of values of dielectric loss and dielectric constant, from the ferroelectricity point of view, were obtained when the precursor with orthorhombic structure was employed.

Bibliography

Raymond, O., Font, R., Suárez-Almodovar, N., Portelles, J., & Siqueiros, J. M. (2005). Frequency-temperature response of ferroelectromagnetic Pb(Fe1∕2Nb1∕2)O3 ceramics obtained by different precursors. Part I. Structural and thermo-electrical characterization. Journal of Applied Physics, 97(8).

Authors 5
  1. O. Raymond (first)
  2. R. Font (additional)
  3. N. Suárez-Almodovar (additional)
  4. J. Portelles (additional)
  5. J. M. Siqueiros (additional)
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Dates
Type When
Created 20 years, 4 months ago (April 7, 2005, 6:19 p.m.)
Deposited 2 years ago (Aug. 4, 2023, 4:54 p.m.)
Indexed 1 month ago (July 30, 2025, 6:45 a.m.)
Issued 20 years, 4 months ago (April 11, 2005)
Published 20 years, 4 months ago (April 11, 2005)
Published Online 20 years, 4 months ago (April 11, 2005)
Published Print 20 years, 4 months ago (April 15, 2005)
Funders 0

None

@article{Raymond_2005, title={Frequency-temperature response of ferroelectromagnetic Pb(Fe1∕2Nb1∕2)O3 ceramics obtained by different precursors. Part I. Structural and thermo-electrical characterization}, volume={97}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.1870099}, DOI={10.1063/1.1870099}, number={8}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Raymond, O. and Font, R. and Suárez-Almodovar, N. and Portelles, J. and Siqueiros, J. M.}, year={2005}, month=apr }