Zeineb Raddaoui

• Doctor of Physics
• University of Limoges

The ceramic compound Ba0.97Bi0.02Ti0.9Zr0.05Nb0.04O3 has been fabricated via a molten-salt method to investigate the effect of temperature on the dielectric properties and conduction mechanism. The XRD results suggest that the investigated compound's main phase crystallizes in a pseudo-cubic structure with a space group (Pm − 3 m). The values of th...

The present research study analyzes the consequences of the incorporation of rare earth ions on the pyroelectric, ferroelectric and piezoelectric, and luminescence properties of Ba0.85Ca0.12RE0.03Ti0.90Zr0.04Nb0.042O3 (BCRETZN) (where RE = Ce or Pr) ceramic composites synthesized by means of a solid-state process. Rietveld refinement of X-ray diffr...

This paper reports on the luminescence response and ellipsometry characteristics of the Mn trivalent ion affected by the impact of titanium in the La0.67Ba0.25Ca0.08Mn1-xTixO3 (LBCM1-xTx) (x=0.00 and x=0.05) sample obtained via a Molten Salt process. In fact, the Rietveld method of the X-ray data revealed a rhombohedral structure (R¯3c) at room tem...

The agricultural crops prove to be low-cost and abundant biosorbents that are able to adsorb dyes from contaminant water. In the present study, different techniques were used to characterize the powdered Pergularia tomentosa fruit. After that, the biomaterial was exploited to investigate the adsorption of methylene blue in batch mode. The effects o...

The current research work examines the impact of Rare Earth (RE3+) ion substitution on the structural, optical and conduction properties of a Ba0.85Ca0.12RE0.03Ti0.90Zr0.04Nb0.042O3 (BCRETZN) (RE = Ce, Pr) ceramic compound produced via a solid-state route. The Rietveld method of the X-ray data revealed a tetragonal (P4mm) structure at room temperat...

The current research work examines the impact of Rare Earth (RE3+) ion substitution on the structural, optical and conduction properties of a Ba0.85Ca0.12RE0.03Ti0.90Zr0.04Nb0.042O3 (BCRETZN) (RE = Ce, Pr) ceramic compound produced via a solid-state route. The Rietveld method of the X-ray data revealed a tetragonal (P4mm) structure at room temperat...

The current research work investigates the effect of incorporating rare earth ions on the structural, vibrational, and dielectric behaviors of La0.67R0.03Ca0.20Sr0.10MnO3 (LRCSM) (R= Pr, Er) manganites. The LRCSM (R= Pr, Er) ceramics were elaborated via the solid-state route. The X-ray diffraction at room temperature showed that all the samples cry...

A new perovskite Ba0.75Sr0.25Ti0.9Zn0.2O3 (BSTZO) was synthesized via Molten Salt route. The Rietveld analysis of the X-ray pattern at room temperature indicated a tetragonal structure (P4mm) of the BSTZO ceramic. The conduction process and electrical behavior of the BSTZO ceramic were examined in relation to frequency and temperature. The frequenc...

The perovskite sample La 0.7 Sr 0.25 Na 0.05 Mn 0.7 Ti 0.3 O 3 (LSNM 0.70 T 0.30) was produced via a solid-state route process. The frequency dependence of electrical conduction plot established that according to the Jonscher law. The electrical conduction process was based on both theoretical conduction models assigned to the non-overlapping small...

In this paper, we have reported the vibrational and photoluminescence properties of Ba0.97Bi0.02Ti0.9Zr0.05Nb0.04O3 (BBTZN) polycrystalline perovskite produced via the Molten Salt reaction. The Raman spectrum indicated the chemical disorder in the BBTZN sample, at room temperature. The values optical gap and Urbach energy were evaluated on the basi...

This work investigated the dielectric and optical process of La0.67Ba0.25Ca0.08Mn0.90Ti0.10O3 (LBCMT) manganite using impedance spectroscopy and ellipsometric spectroscopy. LBCMT nano-polycrystalline sample synthesized by the molten salt method was subjected to annealing it 1000 °C. The dielectric performance was estimated on the basis of the polar...

In this paper, we have reported the vibrational and photoluminescence properties of Ba Bi Ti Zr Nb O (BBTZN) polycrystalline perovskite produced via the Molten Salt reaction. The Raman spectrum indicated the chemical disorder in the BBTZN sample, at room temperature. The values optical gap and Urbach energy were evaluated on the basis of the UV–Vis...

Metal-carbon composites (MCC) were produced by the dissolving of the Fe, Co and Ce nitrates in phenol-formaldehyde resin with further pyrolysis (under heating up to 800°C). Concentrations of the metal compositions in final MCC were 2, 7 and 15 wt.%. Phase composition of the final MCC samples was determined using XRD and Mössbauer spectroscopy. It w...

This paper reports on the Raman spectroscopy and the photoluminescence spectra of Nd- and W- doped BaTiO3 (BT) ceramics prepared using the molten-salt method. The samples were subjected to annealing at a temperature of 900°C. Raman spectroscopy was carried out at room temperature on doped ceramics and pure BT. The incorporation of Nd³⁺ for Ba²⁺ in...

Study of Raman scattering and fluorescent effect in Ba0.96Nd0.0267Ti(1-x)WxO3 ceramics

The new perovskite compound La0.7Sr0.3Mn0.8Fe0.2O3 (LSMFO) was synthesized via the solid-state reaction process. The structural properties of LSMFO were measured at room temperature using Scanning Electron Microscopy and powder X-ray pattern. Our sample crystallized in the rhombohedral ( ) structure. The electrical and dielectric behaviors were inv...

We are interested to investigate the effect of Nb 5+ addition on morphological, dielectric, and optical properties of Ba 0.97 La 0.02 Ti 1−x Nb 4x/5 O 3 (for x = 0.00, 0.05) ceramics. The BLT and BLT 0.95 N 0.04 were successfully synthesized by a low-cost molten-salt method. In addition, the structural phase purity of ceramics was definite by using...

The conduction mechanism and electric properties of La0.67Ba0.25Ca0.08MnO3 (LBCM) were analyzed depending on temperature and frequency. The relaxation processes were examined with modulus and impedance formalism, whilst, the conductivity mechanism was studied via electrical conductivity. The frequency dependence of electrical conduction plot was ex...

The vibrational and optical properties of an La 0.7 Sr 0.25 Na 0.05 Mn 0.7 Ti 0.3 O 3 (LSNMT) polycrystalline sample produced via a solid-state reaction were studied. The Raman spectrum at room temperature reveals the chemical disorder in our compound. The optical gap and Urbach energy were estimated on the basis of the absorption spectrum. Moreove...

The conduction mechanism, electric properties, and I–V behavior of the polycrystalline Ba0.97Bi0.02Ti0.9Zr0.05Nb0.04O3 (BBTZN) ceramic analyzed as a function of frequency and temperature. The relaxation phenomena were studied with impedance and modulus formalism, while the conductivity mechanism was investigated using electrical conductivity. The t...

The influence of Ti⁴⁺ ions incorporated into the B site on the structural, vibrational and optical properties of La0.67Ba0.25Ca0.08Mn(1−x)TixO3 (LBCM(1−x)Tx), a polycrystalline compound prepared by a molten salt method, was discussed. The X-ray diffraction (XRD) studies confirmed that at room temperature these compounds crystallize in the rhombohed...

The ABO 3 oxide with perovskite structure is used in various fields in particular in electronics because of its interesting dielectric, ferro-electrical and optical properties. However, for specific applications (ex: multilayer's capacitors), it is necessary to develop reproducible ceramic with stable characteristics according to temperature. In th...

In this paper, the synthesis of Ca 0.1 Na 0.9 Ti 0.1 Nb 0.9 O 3 (CNTN) ceramic by a solid-state reaction method is reported. The results of Rietveld refinement of X-ray diffraction (XRD) patterns at room temperature showed a pure tetragonal perovskite (P4mm space group). Raman spectroscopy analysis, ranging from of 50 to 1000 cm À1 , at room temper...

In the present work, structural and dielectrics properties of polycrystalline sample Ba0.97Bi0.02Ti0.9Zr0.05Nb0.04O3 (BBTZN) prepared by molten-salt method were investigated. X-ray diffraction analyses revealed the formation of a single-phase pseudocubic structure with a Pm-3m space group. Unlike the trend observed in classic ferroelectrics, the te...

In the present work, the effects of temperature and frequency on the electrical transport properties of polycrystalline samples of Ba(1-x)Nd2x/3TiO3 (BNxT) (x=0.00 and x=0.04), prepared by molten-salt method, are discussed. X-Ray diffraction reveals that all the samples crystallize in a tetragonal symmetry (space group P4mm) with the formation of n...

The Ba0.97Nd0.0267Ti(1-x)WxO3 (BNTx) pervoskite with a single phase tetragonal structure was prepared at 900°C using the Molten Salt method. Raman spectra, Fourier Transform infrared spectra (FT-IR), absorption spectra (Vis-NIR), photoluminescence spectra (PL) in the temperature range from 10-300K were used to investigate the correlations between t...

Polycrystalline sample of Ba0.97Nd0.0267Ti0.95W0.05O3 was prepared by the Molten Salt method. X-Ray diffraction (XRD) analysis using Rietveld refinement has shown that the sample under investigation crystallises in the tetragonal structure with a P4mm space group. Complex impedance analysis confirmed a non-Debye relaxation phenomenon in the compoun...

Etude des propriétés acide-base des fibres lignocellulosiques (Posidonia Oceanica, Son de blé) et corrélation avec la capacité d’adsorption