A5084050296- Ferroelectric and Piezoelectric Materials
- Multiferroics and related materials
- Microwave Dielectric Ceramics Synthesis
- Acoustic Wave Resonator Technologies
- Magnetic and transport properties of perovskites and related materials
- Dielectric properties of ceramics
- Electronic and Structural Properties of Oxides
- Advanced Condensed Matter Physics
- Glass properties and applications
- Dielectric materials and actuators
- Crystal Structures and Properties
- 2D Materials and Applications
- Photorefractive and Nonlinear Optics
- Gas Sensing Nanomaterials and Sensors
- X-ray Diffraction in Crystallography
- Advanced Sensor and Energy Harvesting Materials
- Advanced Photocatalysis Techniques
- MXene and MAX Phase Materials
- Solid-state spectroscopy and crystallography
- Chemical Synthesis and Characterization
- Transition Metal Oxide Nanomaterials
- Conducting polymers and applications
- Perovskite Materials and Applications
- Crystallization and Solubility Studies
- ZnO doping and properties
Université de Picardie Jules Verne
2016-2025
Laboratoire de physique de la matière condensée
2015-2024
Laboratoire de Physique Théorique de la Matière Condensée
2011-2023
UniLaSalle Amiens (ESIEE-Amiens)
2020-2021
Khalifa University of Science and Technology
2018
IIT@MIT
2018
University of Sfax
2016
Cadi Ayyad University
2016
The electrocaloric effect was investigated in lead-free Zr doped Ba0.8Ca0.2(ZrxTi1−x)O3 (BCTZ) ceramics synthesized by a conventional sintering process. Room-temperature x-ray diffraction analysis showed that the tetragonal structure is obtained BCTZ for x ≤ 0.08 and pseudo cubic phase > 0.08. dielectric spectroscopy calorimetry revealed Curie temperature decreases as consequence of doping exhibits first order ferroelectric transition. determined calculation change (ΔT) using Maxwell...
The photocatalytic degradation of methylene blue is a straightforward and cost-effective solution for water decontamination. Although many materials have been reported so far this purpose, the proposed solutions inflicted high fabrication costs low efficiencies. Here, we report on synthesis tetragonal (1T) hexagonal (2H) mixed molybdenum disulfide (MoS2) heterostructures an improved efficiency by means single-step chemical vapor deposition (CVD) technique. We demonstrate that 1T-MoS2/2H-MoS2...
Abstract Pulsed‐laser‐deposition (PLD) is used to deposit MoS 2 thin films at substrate temperatures ( T d ) ranging from 25 700 °C. A = 500 °C identified as the optimal temperature that yields consisting of highly‐crystallized 2H‐MoS phase with a strong (002) preferential orientation, direct optical bandgap E g ∼1.4 eV and photoresponse ∼1500%. Raman spectroscopy revealed degree vertical alignment layers in also reaches its maximum High‐resolution‐transmission‐electron‐microscopy has...
The freezing of the dynamic process in a 9/65/35 lanthanum lead zirconate-titanate (PLZT) ceramics has been investigated by measurements frequency-dependent complex dielectric constant and quasistatic field-cooled (FC) zero-field-cooled (ZFC) susceptibilities. It was found that aging is responsible for difference temperature variations FC static determined ZFC experiment. Analysis susceptibility temperature-frequency plot revealed an aged PLZT sample ergodicity broken due to divergence...
We have performed x-ray diffraction and Raman spectroscopy measurements in the temperature range of 300–873 K on a single phase epitaxially oriented BaTiO3 thin film grown by pulsed laser deposition crystal MgO substrate. The θ–2θ room asymmetric rocking curves indicate that is very weakly tetragonal with c-axis parallel to plane film. X-ray up high reveal only change slope perpendicular lattice parameter around 450 (in bulk Tc=395 K) indicating diffuse-like transition taking place. Room...
Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT) relaxor ferroelectric ceramics exhibit enhanced energy storage and electrocaloric performances due to their excellent dielectric properties. In this study, the temperature-dependence of structural properties, as well field properties in BCZT elaborated at low-temperature hydrothermal processing are investigated. X-ray diffraction Raman spectroscopy results confirmed ferroelectric-paraelectric phase transition ceramic. At room temperature 1 kHz, constant loss...
Abstract Ba 0.85 Ca 0.15 Zr 0.10 Ti 0.90 O 3 (BCZT) lead-free ceramics demonstrated excellent dielectric, ferroelectric, and piezoelectric properties at the morphotropic phase boundary (MPB). So far, to study effect of morphological changes on dielectric ferroelectric in BCZT ceramics, researchers have mostly focused influence spherical grain shape change. In this study, with rod-like grains aspect ratio about 10 were synthesized by surfactant-assisted solvothermal route. X-ray diffraction...
Polycrystalline lead-free Sodium Bismuth Titanate (NBT) ferroelectric ceramics doped with rare earth (RE) element are prepared using solid state reaction method. Optical, ferroelectric, and electrocaloric properties were investigated. The introduction of RE3+ ions in the NBT host lattice shows different light emissions over wavelength range from visible to near infrared region. P-E hysteresis loops exhibit an antiferroelectric-like character room temperature indicating possible existence a...
Abstract Raman spectroscopy was used to characterize the polymorphs and liquid state of cocoa butter, with emphasis placed on evolution ester carbonyl stretching region (1800–1700 cm −1 ), along complementary analysis comparison Raman‐active CC (1200–1000 CC (1660 CH (3000–2700 ) CH 2 (1500–1250 vibrational modes. Unique signatures were obtained for all butter polymorphs, their identity confirmed using DSC XRD. The permitted polymorph discrimination due differences in number modes,...
We report on the fabrication of sub-20 nm BiFeO3 (BFO) nanoparticles using a solid-state approach and preferential leching process. The were subsequently used to deposit, through spray pyrolysis, BFO thin films in rhombohedral (R3c) crystallographic structure. Then, systematic investigations optical photocatalytic properties conducted determine effects particles size, microstructure increased surface area their catalytic performances. Especially, improved observed, with an bandgap energy...
The beneficial effects of lanthanide incorporation into 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 (BNT-BT) matrix on its functional properties were investigated. conventional solid-state method was used for synthesizing samples. structural refinement revealed that all samples crystallized in R3c rhombohedral symmetry. Raman spectroscopy study carried out using green laser excitation and no clear perceptible variation frequency is observed. Dielectric measurements unveiled the introduction rare earth...