A5090572958- Ferroelectric and Piezoelectric Materials
- Crystal Structures and Properties
- Microwave Dielectric Ceramics Synthesis
- Solid-state spectroscopy and crystallography
- Photorefractive and Nonlinear Optics
- Glass properties and applications
- Chemical Synthesis and Characterization
- Multiferroics and related materials
- Luminescence Properties of Advanced Materials
- Acoustic Wave Resonator Technologies
- Polyoxometalates: Synthesis and Applications
- Dielectric properties of ceramics
- Thermal and Kinetic Analysis
- Pigment Synthesis and Properties
- Liquid Crystal Research Advancements
- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- X-ray Diffraction in Crystallography
- Inorganic Chemistry and Materials
- Nuclear materials and radiation effects
- Catalysis and Oxidation Reactions
- Zeolite Catalysis and Synthesis
- Photonic and Optical Devices
- Optical and Acousto-Optic Technologies
- Magnetic and transport properties of perovskites and related materials
Mohammed V University
1985-2024
La Rochelle Université
2013-2022
Centre National de la Recherche Scientifique
1994-2019
Laboratoire des Sciences de l'Ingénieur pour l'Environnement
2013-2019
Fachhochschule Kiel
2009
École nationale supérieure de chimie de Mulhouse
1994-1996
École Nationale Supérieure de Chimie de Lille
1995
Université de Lille
1995
Centre National pour la Recherche Scientifique et Technique (CNRST)
1994
University of Freiburg
1994
CaCu 3 Ti[Formula: see text]Y x O[Formula: text] (0[Formula: text]0.12) ceramics were fabricated with conventional solid-state reaction method. Phase structure and microstructure of prepared characterized by X-ray diffraction (XRD) scanning electron microscopy (SEM), respectively. The impedance modulus tests both suggested the existence two different relaxation behavior, which attributed to bulk grain boundary response. In addition, conductivity dielectric permittivity showed a step-like...
Structural and functional properties of multiferroic BiFeO3 are currently under debate. We utilized Raman spectroscopy to characterize the structural pure up 10mol% LaMnO3-doped polycrystalline thin films. All films were identified as phase-pure perovskite using x-ray diffraction (XRD). Although XRD has insufficient sensitivity for detailed film analysis, experiments showed that structure is best described monoclinic, doping with LaMnO3 causes substantial modifications, namely, Jahn–Teller...
The crystal structure of (1−x)BaTiO3-xBiAlO3 (x = 0, 0.02, 0.05, 0.08, and 0.1) ceramics was determined using X-ray diffraction Raman spectroscopy at room temperature, which revealed a phase transition from tetragonal to rhombohedral with increasing x. dielectric properties were studied as function temperature different frequencies, indicated that the (Tm) decreased relaxor behavior observed by frequency dependent permittivity. Lorenz-type quadratic law used characterize permittivity peaks...
Ternary phosphates are found to vitrify within large domains of compositions inside the phase diagrams P 2 O 5 –WO 3 –A (A = Li, Na). Structural approach highly modified glasses MoO 4 (M Mo,W) was investigated using various spectroscopic techniques such as infrared, Raman, and electron spin resonance (ESR). These were contain MO 6 octahedra, tetrahedra, M 7 dimers, PO also or metaphosphate chains, depending on composition considered. As shown in earlier studies, glass network is...
Chemical solution processed BiFeO3 thin films usually show high leakage currents and poor ferroelectric properties. The optimizations of processing conditions doping with appropriate elements have been among the most promising strategies to enhance overall properties films. However, detailed studies on effects structure through it are still lacking. In this work we investigate interplay between dielectric-electric-ferroelectric BiFeO3–LaMnO3 [Bi1−xLaxFe1−xMnxO3 (0≤x≤0.1)] solid grown...
Abstract Some of the title compounds have been found to exhibit ferroelectricity at room temperature. Their structure types can be classified in three series according cations coordination number (CN) and size: 1.- single cation with CN 4: olivine glaserite; 2.- two Beryllonite stuffed tridymite; 3.- all α-LiZnPO4 is unique case known.
A crystal chemical study carried out on phosphate single crystals with the formula AIBIIPO4 (AI=Na, K; BII=Ca, Zn, Sr, Cd, Ba, Pb) has permitted to follow evolution of symmetry inside these series. Second harmonic generation (SHG) tests held powder or small and hysteresis loops displayed ceramic samples confirmed existence ferroelectricity in material
Abstract The series of the title compounds were prepared by solid-state reactions. phase transitions between room temperature and 1450 °C investigated DTA X-ray diffraction. All undergo at least one reversible transition in solid state. Rb containing compounds, with exception those Cd Zn, show no liquid up to °C. phases formed crystallize various structures which can be described partly as distorted olivine, LiKSO4, CsZnPO4 or glaserite. RbCdPO4 shows an incommensurate structure a...