Investigating the Structural and Dielectric Properties of La-doped PbLaxTi(1-3/4x)O3 Perovskite Ceramics: The Role of La Content

Salem, Mohamed; Serag, Eman N.; Hemeda, Osama M.; Altarawneh, Aseel M.; Henaish, A. M. A.; Abdelgawad, Sayed Ahmed

doi:10.21608/djs.2023.187668.1073

Investigating the Structural and Dielectric Properties of La-doped PbLaxTi(1-3/4x)O3 Perovskite Ceramics: The Role of La Content

Document Type : Research and Reference

Authors

¹ Physics department, Faculty of science, Tanta university.

² Physics Department, Faculty of science, Tanta university.

³ Basic science,Faculty of Engineering MUST University, Cairo, Egypt.

10.21608/djs.2023.187668.1073

Abstract

In this study, PbLaxTi(1 - 3/4 x)O3 (PLT) ceramics were prepared using the tartrate precursor method with varying La content (x= 0, 0.04, and 0.1). The samples were annealed at 600°C and characterized using X-ray diffraction, Fourier-transform infrared spectroscopy, high-resolution transmission electron microscopy and dielectric measurements. The results showed that all samples doped with La ions had a first-order structural phase transition from tetragonal to cubic at the Curie temperature (Tc). This phase transition was also associated with a transition from ferroelectric to paraelectric phase. The dielectric spectra revealed that the material displayed relaxer-type ferroelectric behavior, with Tc shifting to a higher value and dielectric constant increasing with increasing La content up to x=0.04. The increase in dielectric constant was attributed to the decrease in grain size in the given range of La content. Furthermore, La doping in lead titanate (PT) led to the formation of A-site vacancies, which affected the Curie temperature and the atomic radius between La and Pb ions. This study highlights the potential of using La ions as a dopant in PT ceramics to improve their ferroelectric properties, specifically by inducing a relaxor behavior.

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