Kamel Khirouni

• Full Professor
• Principal Investigator at University of Gabès

This study explored the effect of annealing temperature on the thermal, structural, morphological, and electrical properties of Ni 0.6 Cd 0.4 FeAlO 4 spinel ferrites fabricated via the sol-gel method. Rietveld analysis of x-ray diffraction measurement confirms its cubic spinel structure. An increase in calcination temperature causes the crystallite...

This study explored in detail the structural, conduction mechanisms, dielectric, and optical characteristics of two perovskites La0.5Ca0.5CrO3 (LCCO) and La0.5Sr0.5CrO3 (LSCO) prepared via sol–gel method. The X-ray diffraction analysis indicated a pure phase with no additional phases present in our samples. The investigation of electrical conductiv...

The objective of this work is to investigate the structural, optical, electrical, magnetic and dielectric properties of the sol–gel produced half-doped La0.5Ba0.5CrO3 perovskite. Rietveld analysis of X-ray diffraction measurement confirms its orthorhombic structure with the Pnma space group. The pattern reveals uniform crystallization of the produc...

The Ni0.5Cd0.5Cr2O4spinel chromite was prepared through the sol-gel process. The x-ray diffraction analysis indicates that the present sample is well crystallized in the cubic structure with the Fd-3 m space group. The average crystallite size was estimated to be in the range of 38-55 nm. The Fourier transform infrared analysis confirmed the format...

This work examines the structural, elastic, and optical properties of the Li0.5Co0.5FeCrO4 spinel ferrite. Rietveld analysis of X-ray diffraction measurement confirms its cubic spinel structure. The structural investigation reveals strong consistency among calculated and refined parameters, validating the proposed cation distribution. Elastic modul...

In this study, we synthesized Mg0.5Ni0.5Fe2O4 (MNFO) spinel ferrites and Eu-doped spinel Mg0.5Ni0.5Fe1.98Eu0.02O4 (MNFEuO) using a solid-state method. Our comprehensive analysis included structural, morphological, and dielectric properties. X-ray diffraction confirmed the cubic structure of both MNFO and MNFEuO. The Rietveld refinement revealed an...

The exploration of spinel ferrites, particularly those with the formula AFe2O4, has gained considerable interest owing to their structural, electrical, and optical features. This study focuses on enhancing the dielectric properties of CuFe2O4 ferrite through doping with Mg, Co, and Cr. Using the sol-gel technique, we synthesized Cu0.5Mg0.3Co0.2FeCr...

The effects of annealing temperature on the thermal, structural, and dielectric properties of spinel ferrites Mg0.4Cd0.3Cu0.3Fe2O4 were studied in this work. Two specimens were prepared by the sol–gel technique under different annealing temperatures (850°C and 950°C). Rietveld analysis of x-ray diffraction data revealed a well-formed cubic spinel s...

The emergence of new functionalities in transition metal oxides and their interfaces poses an important challenge. Many recent discoveries regarding the polar/nonpolar interface between perovskite oxides open new avenues for modern applications. SrTiO3/LaCrO3 heterostructures are particularly intriguing due to a polar discontinuity along the [001]...

In this research, we investigate the structural, electrical, and dielectric properties of the LiNbO 3 compound. Our sample was elaborated using two methods: solid-solid (sample S1) and sol-gel (sample S2). X-ray diffraction analysis with Rietveld refinement confirmed that both samples are single-phase and crystallize in the rhombohedral structure w...

This study examines the effects of varying calcination temperatures on the properties of Ni0.4Cu0.4Cd0.2Fe2O4 spinel ferrites. As confirmed by X-ray diffraction measurements, the compound calcined at 950°C exhibits a larger average crystallite size and lattice constant than the sample calcined at 850°C. The electrical conductivity study demonstrate...

Organic–inorganic hybrid materials have recently found a vast variety of applications in the fields of energy storage and microelectronics due to their outstanding electric and dielectric characteristics, including high dielectric constant, low conductivity, and low dielectric loss. However, despite the promising properties of these materials, ther...

This research investigates the properties of Ni0.4Cu0.4Cd0.2FeCrO4 spinel ferrites at calcination temperatures of 850 °C and 950 °C. X-ray diffraction measurements show a higher average crystallite size and lattice constant for the sample calcined at 950 °C. Conversely, both the tetrahedral (A) and octahedral (B) cation-oxygen bond lengths (dA-O an...

This work investigates the Cu0·6Ni0·2Co0·2FeAlO4 (CNCFAO) spinel nanoparticle, focusing on its structural, magnetic, elastic, and optical properties. The structural analysis provided various parameters, such as lattice parameter, crystallite size, and bond lengths, which were compared to theoretical values. The force constants of the sample were us...

This work aims to study in detail the structural, impedance-spectroscopy, thermodynamic and optical properties of the Pr0.5Ce0.5FeO3 compound. X-ray diffraction data reveals that our compound crystallize in the orthorhombic structure with the Pnma space group. Conductivity analyses reveals that the produced Pr0.5Ce0.5FeO3 sample have significant el...

The YTi0.5Mn0.5O3 (YTMO) perovskite was synthesized by the conventional solid-state method. The structural, electrical, dielectric and optical properties were investigated. The X-ray diffraction analysis and Rietveld refinements indicates that sample under study crystallizes in the orthorhombic structure with the Pmmm space group. The impedance spe...

This study investigated the properties of Cu 0.4 Mg 0.4 Co 0.2 FeCrO 4 spinel ferrite synthesized using the sol-gel technique. The analysis covered thermal, morphological, structural, optical, magnetic, and electrical characteristics. The X-ray pattern analysis using Rietveld's refinement confirmed the well-formed cubic spinel structure of the samp...

The synthesis of Ni0·5Fe2·5O4 nanoparticles was successfully carried out by the self-combustion method using glycine as fuel. Analysis of the XRD measurements indicates the formation of a cubic spinel monophase with the space group (Fd-3m) and a nanometric crystallite size. According to the optical study, this sample shows strong absorption in the...

In this study, we examined the effect of calcination temperature on the structural, electrical transport and optical characteristics of Cd0.3Ni0.2Co0.3Cu0.2Fe2O4 spinel ferrites. The samples, designated as S850 and S950, were prepared using sol-gel method, followed by calcination at 850 °C and 950 °C, respectively. The structural analysis for the s...

Soil salinization is considered among the most serious problems that affect irrigated lands and food security in the world. It is interesting to develop methods to test soil salinization. In this paper, the electric properties of sand-salt crystals (NaCl) mixtures (SSM) are investigated using electrical impedance spectroscopy. Seven samples were co...

To realize low-cost, environmentally friendly electronic devices and circuits, there is currently a strong trend to explore plant-based dielectric materials because they can be responsibly sourced from agricultural or forest vegetation, are generally water-soluble, and possess good electrical insulator properties. In this contribution, organic fiel...

The new spinel ferrite has garnered significant attention and has piqued the broadest interest among scientists due to its versatile and promising features, as well as its wide range of applications. In this study, we outline the process of synthesizing nano-sized Li-Cr ferrite powder, which exhibits remarkable dielectric relaxor activity when expo...

We explore the photovoltaic properties of a novel homojunction solar cell based on NNO(p)/NNO(n) perovskite by employing a combination of material synthesis, characterization and density functional theory calculations that are novel ideas compared to those previously reported in the literature. The band structure reveals that NaNbO3 introduces a n-...

In the present study, a series of lead-free ceramics (1−x)BaFe0.5Nb0.5O3-xBiCu0.75W0.25O3 (BFN-xBCW) were synthesized using a solid-state reaction method. The crystallization of all samples in the cubic structure with Pm 3¯\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{...

In this study, the impact of varying calcination temperatures on the structural, impedance spectroscopy, and optical properties of Ni0.4Cd0.3Co0.3Fe2O4 spinel ferrites was examined. The experimental XRD results indicated that increasing the calcination temperature resulted in an increase in both grain size and cell parameters. The samples display d...

NaCu0.2Fe0.8-xMnxO2 compounds were prepared by the solid state method. The structural analyses confirmed that the samples crystallize in hexagonal system with R-3 m space group. Fourier transform infrared spectroscopy shows vibrational modes of the compounds NaCu0.2Fe0.8-xMnxO2 and proves the presence of the octahedral environment MO6 (M = Cu, Fe,...

The impact of calcination temperature on the structural, electrical, and dielectric properties of Ni0.6Mg0.2Co0.2FeCrO4 spinel ferrites was investigated in this work. The sol–gel method was used to prepare two different samples (S850 and S950) at calcination temperatures of 850 �C and 950 �C, respectively. We used thermogravimetric analysis to inve...

We investigate the electrical and dielectric properties of the La 0.4 Bi 0.3 Sr 0.2 Ba 0.1 MnO 3 manganite that is prepared by the sol-gel method. Over the explored temperature interval, our compound reveals a semiconductor behavior. At elevated temperatures, the transport properties are explained by the activation of the small polaron hopping mech...

This article explores the impact of co-doping BaTiO3 ceramics with Ca2+ and Y3+ using solid-state reactions to improve its dielectric constant and decrease losses. The oxide BCTYO (Ba0.95Ca0.05Ti0.95Y0.05O2.975) exhibits a tetragonal crystal structure, characterized by a space group of P4mm. By examining the behavior of the doped BaTiO3 sample and...

In the present work, we synthesized the perovskite Ba0.70Er0.16Ca0.05Ti0.91Sn0.09O3 compound (BECTSO) by a solid-state reaction and sintering at 1200 °C. The effects of doping on the structural, electrical, dielectric, and ferroelectric characteristics of the material are examined in this work. X-ray powder diffraction analysis shows that BECTSO cr...

In this work, the new polycrystalline Pr0.5Ce0.5CoO3 was successfully synthesized by sol–gel process. X-ray diffraction (XRD) analysis reveals that the prepared sample is well crystallized in the orthorhombic structure with the Pnma space group. The electrical conductivity analyses indicates that Pr0.5Ce0.5CoO3 has a semiconducting behavior. Nyquis...

Cu0.5Fe2.5O4 nanoparticles were synthesized by the self-combustion method whose XRD and FTIR analyzes confirm the formation of the desired spinel phase. The thermal evolution of conduction shows a semiconductor behaviour explained by a polaronic transport mechanism governed by the Non-overlapping Small Polaron Tunnelling (NSPT) model. DC conductivi...

In the present work, Sr-doped lanthanum manganite is successfully synthesized using sol–gel route. Obtained compounds are annealed at 600 and 800 °C in the aim to modify the nanoparticles size. Structural, morphological, and electrical properties are characterized by X-ray diffraction, transmission electron microscopy, and impedance spectroscopy te...

In this research paper, the [C13H16N2]5(BiCl6)3Cl compound was synthesized, by slow evaporation, at room temperature. It was analyzed by X-ray diffraction, thermal analysis and impedance spectroscopy techniques. The phase transition at T = (400 ± 5)K was evidenced by DSC measurements and confirmed by the electrical study. The electrical measurement...

In this study, the structural, optical, and dielectric properties of Ni0.3Cd0.7Cr2O4 (abbreviated as NCCO) chromite sample prepared by sol–gel method has been examined. The XRD characterization for this compound confirmed the development of the face-centered cubic spinel structure with space group. This suggests that each particle identified by the...

In the present research study, the structural, optical, magnetic, electrical and dielectrical properties of the spinel ferrite Li0.5MgFe1.5O3.5, synthesized using a sol-gel auto-combustion method were studied. X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), and Raman spectroscopy revealed that this sample crystallizes in a cubic...

Due to remarkable dielectric features, such as a large dielectric constant, strong electrical conductivity, high capacitance, and low dielectric loss, hybrid materials have lately seen a huge number of applications in the field of optoelectronics. These are critical characteristics that qualify the performance of optoelectronic devices, particularl...

This study investigated the thermal, structural, and optoelectronic properties of Mg0.4Cu0.4Cd0.2Cr2O4 spinel chromites prepared by the sol-gel method at different calcination temperatures (850 and 950 °C). According to Rietveld’s refinement of the X-ray patterns, the samples crystallized in the cubic spinel structure (Fd3¯m\documentclass[12pt]{min...

Ferrite compounds have recently attracted significant interest because of their multifunctional properties. This work investigates the optical, magnetic, and dielectric properties of a LiMn0.5Fe2O4 ferrite prepared by a solid-state reaction. Raman spectroscopy analysis substantiated the presence of the 5 active modes representing the vibration of t...

In this work, we investigate the structural and optical properties of the LiNbO3 compound. The sample is prepared using the solid–solid (LN1) and sol–gel (LN2) methods. The obtained compounds were characterized by X-ray diffraction, UV–Vis and IR spectroscopy. X-ray diffraction analysis using Rietveld refinement shows that all our samples are singl...

The sample of La0.8Pb0.2Fe0.75Mg0.25O3 was synthesized via the sol-gel route. The refinement using the Rietveld method confirms that the structure is orthorhombic with space group Pnma. The dielectric properties () and modulus (M) of the material were studied at a wide range of temperatures and frequencies. The constant dielectric values for our c...

The sol gel process was used to elaborate nanoparticles with the formula Nd0.5Ce0.5CoO3 sintered at 850 °C. X-ray diffraction (XRD) was employed to study the phase of our compound as well as the average particle size. Our sample has an orthorhombic structure with the Pnma space group. Furthermore, impedance spectroscopy was used to characterize the...

An investigation of the structural, morphological, magnetic, and optical properties of Ni0.6Mg0.2Co0.2FeCrO4 spinel ferrites prepared by the sol–gel method at different annealing temperatures conducted. The grain size and the unit cells parameters of the synthesized samples exhibit an increasing trend as the annealing temperature increases. A low c...

Electrical responses and dielectric behaviors of Pr0.65Ca0.25Ba0.1MnO3 were detailed using impedance spectroscopy impedance. The investigation of DC electrical conductivity indicates that the sample shows a semiconductor behavior. In the high-temperature region, the resistivity data was described by the Holstein non-adiabatic small polaron hopping...

The mixed alkali-diphosphate materials are among the widely used commercial materials due to their outstanding physical properties. The Li2Na2P2O7 (LNOP1) and Li3NaP2O7 (LNOP2) compounds have been synthetized by the conventional solid-state method. The structural and morphological analysis, optical properties, electrical and dielectric measurements...

The sodium ion–based materials have interesting physical properties which make them suitable for industrial applications. In this paper, we focus our work on sodium ytterbium phosphate NaYbP2O7, prepared by the solid-state method. It is found that NaYbP2O7 crystallizes in the monoclinic system with P121/n1 space group. Impedance analysis shows that...

The copper hydrogeno-arsenite tellurate material (CuAsTe) was synthesized and its magnetic properties were investigated. Thermal analyses revealed that no mass loss was recorded before 480 K. Additionally, in this current work, electrical properties based on the impedance measurements were determined. The complex impedance diagram at different temp...

The \(Li{Mg}_{2}{Fe}_{3}{O}_{7}\) compounds were prepared by via the citrate process and sintered at two different temperatures to study their effect on structural, morphological, optical, and electric properties. The X-ray diffraction analysis revealed that both samples crystallized in a cubic spinel structure belonging to space group \(Fd\overlin...

Natural substances are potential compounds for green electronic devices. So, scientists have to explore and optimize their properties to insert them as active layers in electronic heterostructures. In this study, microstructural, optical, and electrical properties of thin layers of the propolis are investigated. Propolis is a biological organic bio...

Polycrystalline Nd0.5Ba0.5FeO3 (NBFO) perovskite was prepared with sol–gel method, calcined at a temperature of 900 °C. Here, we study the influence of the Barium ion Ba²⁺introduced in the Nd site on the structural, electrical, dielectric and thermodynamic properties of our NBFO sample. The electrical conductivity obeying the Jonscher’s power law i...

Two ferrite ceramic materials, Mn 0.5 Fe 2.5 O 4 and Zn 0.5 Fe 2.5 O 4 were produced by the autocombustion method. X-ray diffraction (XRD) analysis indicates the formation of a spinel phase with a cubic structure. FTIR spectra are used to study the elastic properties which leads to a ductile nature of our compounds. The UV-Visible absorption result...

Nature and its biodiversity provide academics with a plethora of research topics, including the development of dielectric layers based on natural compounds that do not require any purification process for use in electronic equipments. Nevertheless, the properties of natural substances must then be investigated, and a suitable low-cost coating techn...

We have investigated in this work the sintering temperature effects on the structural and optical properties for Mg0.6Co0.2Cu0.2FeCrO4 spinel ferrites. These samples were prepared using sol–gel method and sintered at two different temperatures (900 °C and 1100 °C). The X-ray diffraction analysis and Rietveld refinement confirm that the sample were...

In the present communication, the Ti-doped DyMnO 3 , i.e., DyTi 0.5 Mn 0.5 O 3 (DTMO) perovskite has been synthesized by the conventional solid-state reaction technique, and emphasis has been made to observe the variations on structural, electrical, dielectric, and optical properties of the prepared ceramic. The XRD patterns confirm that our compou...

Due to its significant expansion as a sustainable energy source, the investigation of thin-film-based solar cells is a very important field of research among materials scientists. Nowadays, CdTe based photovoltaic devices are developed using indium sulfide (In2S3) as potential material. This study reports the effect of the annealing temperature, up...

Using the sol gel method, we will incorporate Bi, Sr and Ba in site A into the LaMnO3 matrix to get La0.4Bi0.3Sr0.2Ba0.1MnO3 compound. Our aim is to explore the structural and the electrical properties of this compound. X-ray diffraction study indicates that the investigated compound exhibits a rhombohedral crystalline phase with R3̅c space symmetr...

In this work, Cu0.6Cd0.4Cr2O4 spinel oxide was synthesized by means of sol–gel auto-combustion route. The refined X-ray powder diffraction pattern confirmed the single-phase formation of the material, which crystallized in a cubic spinel structure with space group Fd-3 m. The alternating current conduction mechanism and modulus behavior of this sam...

The highly crystallized orthoferrite of formula Nd 0.5 Ba 0.5 FeO 3 (NBFO) was synthesized by the sol-gel method. The phase of our compound and the average particle size were studied using X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods. The X-ray diffraction patterns showed that the NBFO sample crystallize in the cubic struc...

Deficient strontium effects upon structural and spectroscopic properties of Pr0.8Sr0.2MnO3 have been investigated. Pr0.8Sr0.2−x□xMnO3 (0 ≤ x ≤ 0.2) powder samples have been elaborated by the conventional ceramic method. All the samples crystallized in the orthorhombic perovskite system with Pnma (for x = 0 and 0.05) and Pbnm (for x = 0.1 and 0.2) s...