Lanthanum-doped BaTiO3 ceramics: Structural, dielectric, and ferroelectric properties

Lanthanum-doped BaTiO3 ceramics: Structural, dielectric, and ferroelectric properties

This study examines the structural, dielectric, and ferroelectric properties of pure BaTiO3 and La-doped Barium Titanate (Ba1-xLaxTiO3, BLxT) with x = 0, 5, 10, 20, and 30 %. The samples were synthesized via the sol-gel method and subjected to comprehensive characterization using X-ray diffraction (...

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Main Authors: Adil Moutaouaffiq, Mounir Belhajji, Ali Didi Seddik, Abdellah Tahiri, Enas Ali, Lahoucine Hajji, Abdelilah Rjeb, Prabhu Paramasivam, Sherif S.M. Ghoneim, Ahmed B.Abou Sharaf
Format: Article
Language:English
Published: Elsevier 2025-03-01
Series:Results in Engineering
Subjects:
Sol-gel
BaTiO₃
Structural analysis
Dielectric properties
Ferroelectric
Online Access:http://www.sciencedirect.com/science/article/pii/S2590123025005444
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Summary:This study examines the structural, dielectric, and ferroelectric properties of pure BaTiO3 and La-doped Barium Titanate (Ba1-xLaxTiO3, BLxT) with x = 0, 5, 10, 20, and 30 %. The samples were synthesized via the sol-gel method and subjected to comprehensive characterization using X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared (FT-IR) spectroscopy, differential thermal analysis (DTA), and scanning electron microscopy (SEM). Additionally, dielectric and ferroelectric properties were investigated over a temperature range of -105 °C to 200 °C. XRD revealed pure perovskite crystallization at 950 °C for 4 h. A phase transition from tetragonal (pure BaTiO3) to pseudo-cubic symmetry was observed with increasing La doping. Energy-dispersive spectroscopy (EDX) suggested that La ions occupy both Ba and Ti lattice sites. SEM analysis indicated that doped samples exhibited smaller average grain sizes and uniform grain morphology compared to undoped BaTiO3. These structural findings were corroborated by FT-IR analysis. Dielectric and ferroelectric measurements showed distinct trends with varying La content. Samples with x = 5, 10, and 20 % displayed paraelectric behavior at room temperature, while the x = 30 % sample retained ferroelectric properties. Furthermore, an increasingly diffuse ferro-to-paraelectric phase transition was observed with higher La doping levels, and the BL5T composition exhibited a relaxor-type ferroelectric characteristic.
ISSN:2590-1230

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