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Study of site occupation and resonances in Ba1-xLax-TiO3 ceramics prepared by the sol gel method

Adil Moutaouaffiq|Mounir Belhajji|Abdelilah Rjeb|Salaheddine Sayouri|Driss Sqalli Houssaini|Taj-Dine Lamcharfi
청정에너지연구소 (Clean-Energy Research Institute)|2022.10|Journal of Ceramic Processing Research|제23권 제5호|pp. 570-582|DOI 10.36410/jcpr.2022.23.5.570

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참고문헌

키워드

Structure analysisSol-gelDielectric propertiesBa1-xLaxTiO3 ceramics
주제분류재료공학

초록

Lanthanum (La) doped Barium titanate powders, Ba1-xLaxTiO3 ceramics, with various La concentration (0, 0.25, 0.50, 0.75,1.5 and 3%), were prepared through the sol-gel process and characterized by Thermogravimetric analysis (TGA), Differentialthermal analysis (DTA), X-Ray diffraction (XRD), Fourier Transform Infrared (FT-IR) , Raman spectroscopy and Scanningelectron microscopy (SEM). We have also performed dielectric measurements for temperatures such as 50 < T < 300 °C. Xraydiffraction (XRD) patterns of the prepared powders, calcined at a relatively low temperature (900 °C/4 h), revealed theircrystallization in the pure perovskite structure without the presence of secondary phases. Moreover, from these analyses, it wasshown that La may enter both Ba and Ti sites contrary to what is widely reported in the literature indicating that Laincorporates Ba sites only. Scanning electron microscopy (SEM) analysis showed quite regular morphology of the grains andan average grain size which decreases with introduction of La, in agreement with structural characterization. Raman andFourier Transform Infrared (FT-IR) analyses have given results in accordance with those of XRD and SEM characterizations. The permittivity variations as functions of the frequency showed a decrease in the interval [1kHz-100kHz], followed by ananormal increase in the interval [100 kHz-1MHz], indicating that the samples approached their frequency of resonance.

Abstract

Lanthanum (La) doped Barium titanate powders, Ba1-xLaxTiO3 ceramics, with various La concentration (0, 0.25, 0.50, 0.75,1.5 and 3%), were prepared through the sol-gel process and characterized by Thermogravimetric analysis (TGA), Differentialthermal analysis (DTA), X-Ray diffraction (XRD), Fourier Transform Infrared (FT-IR) , Raman spectroscopy and Scanningelectron microscopy (SEM). We have also performed dielectric measurements for temperatures such as 50 < T < 300 °C. Xraydiffraction (XRD) patterns of the prepared powders, calcined at a relatively low temperature (900 °C/4 h), revealed theircrystallization in the pure perovskite structure without the presence of secondary phases. Moreover, from these analyses, it wasshown that La may enter both Ba and Ti sites contrary to what is widely reported in the literature indicating that Laincorporates Ba sites only. Scanning electron microscopy (SEM) analysis showed quite regular morphology of the grains andan average grain size which decreases with introduction of La, in agreement with structural characterization. Raman andFourier Transform Infrared (FT-IR) analyses have given results in accordance with those of XRD and SEM characterizations. The permittivity variations as functions of the frequency showed a decrease in the interval [1kHz-100kHz], followed by ananormal increase in the interval [100 kHz-1MHz], indicating that the samples approached their frequency of resonance.

참고문헌 (44)

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