Comprehensive study of the structural properties and dielectric responses of Ba(2-x)Sr(x)GdFeNb4O15 materials

A comprehensive investigation has been conducted on Ba (2-x) Sr (x) GdFeNb 4 O 15 powders. These powders were synthesized through the conventional solid-state reaction. X-ray diffraction analysis at room temperature has demonstrated that the samples adopt the TTB-structure, exhibiting the space-grou...

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Bibliographic Details
Published in:Ferroelectrics 2024-03, Vol.618 (4), p.970-982
Main Authors: Farhan, J., Laaraj, A., Bahassan, K., Majdoubi, H., Chakir, A., El Bouari, A., Lachhab, T., Adhiri, R.
Format: Article
Language:English
Subjects:
Barium
Curie temperature
dielectric parameters
Ferroelectric materials
Ferroelectricity
Permittivity
Raman spectra
Room temperature
solid-state reaction
Strontium
structural
Substitution reactions
tetragonal tungsten bronze (TTB)
X-ray diffraction
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Summary:A comprehensive investigation has been conducted on Ba (2-x) Sr (x) GdFeNb 4 O 15 powders. These powders were synthesized through the conventional solid-state reaction. X-ray diffraction analysis at room temperature has demonstrated that the samples adopt the TTB-structure, exhibiting the space-group P4/mbm. The Raman spectra of the samples exhibit remarkable similarity, yet distinct bands at different wave numbers, indicative of the varying modes of the MO6 octahedra. The dielectric studies have uncovered intriguing findings, including a high dielectric constant and a broad permittivity peak. Remarkably, the Curie temperature varies with the substitution rate, yet remains frequency-independent, a clear indication of these materials' classical ferroelectric behavior.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150193.2023.2300608