Sol-gel synthesis and characterization of novel double perovskites RBaFeTiO6 (R= Pr, Nd). Issue 5 (1st March 2022)

• Record Type: Journal Article
• Authors: Boudad, L.; Taibi, M.; Belayachi, A.; Abd-Lefdil, M.
• Is Part Of: Ceramics international. Volume 48:Issue 5(2022)
• Page Start: 6087
• Page End: 6096
• Publication Date: 2022-03-01
• Subjects: Sol-gel method -- Structural analysis -- Raman spectroscopy -- Dielectric response -- Impedance spectroscopy; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.11.147
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this work, novel double perovskites RBaFeTiO6 (R = Pr, Nd) have been prepared through the sol-gel process. The structural, morphological, spectral, and dielectric behaviors were investigated by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, dielectric measurements, and impedance spectroscopy. The objective of this work is to study these properties and investigate the effect of rare earth cations. XRD analysis confirmed the disordered cubic double perovskite structure of all prepared samples. The lattice parameters, bond lengths, and bond angles determined from the Rietveld refinement analysis are found to be dependent on the R 3+ cation size. SEM and TEM micrographs indicated an irregular size distribution of the grains forming these double perovskites. The elemental composition and the stoichiometry of the prepared samples were verified by energy-dispersive X-ray spectrometer (EDX) elemental mapping. Raman and infrared spectroscopies have affirmed the influence of the rare earth element on vibrational properties and bond lengths. The dielectric properties were studied as a function of frequency. Electrical conduction follows Jonscher's universal power law and the conduction is attributed to the localized relaxation (reorientational) hopping mechanism. The presence of both negative (NTCR) and positive (PTCR) temperature coefficients of resistance in these materials is also affirmed by impedance spectroscopy.