A5083853870- Ferroelectric and Piezoelectric Materials
- Microwave Dielectric Ceramics Synthesis
- Advanced Sensor and Energy Harvesting Materials
- Multiferroics and related materials
- Dielectric materials and actuators
- Advanced Thermoelectric Materials and Devices
- Dielectric properties of ceramics
- Advanced machining processes and optimization
- Advanced ceramic materials synthesis
- Carbon Nanotubes in Composites
- Chalcogenide Semiconductor Thin Films
- Electrospun Nanofibers in Biomedical Applications
- Tribology and Wear Analysis
- Advanced Machining and Optimization Techniques
- Acoustic Wave Resonator Technologies
- Graphene research and applications
- Additive Manufacturing and 3D Printing Technologies
- Textile materials and evaluations
- Thermal properties of materials
- Advanced Condensed Matter Physics
- Transition Metal Oxide Nanomaterials
- Aerosol Filtration and Electrostatic Precipitation
- Advanced materials and composites
- Fiber-reinforced polymer composites
- Dental Erosion and Treatment
Northumbria University
2017-2024
Delft University of Technology
2015-2019
Queen Mary University of London
2013-2015
Nanoforce Technology (United Kingdom)
2013
Materials Center Leoben (Austria)
2013
National University of Sciences and Technology
2012
In 0.95[0.94Bi0.5Na0.5TiO3-0.06BaTiO3]-0.05CaTiO3 ceramics, the temperature TS (dielectric permittivity shoulder at about 125 °C) represents a transition between two different thermally activated dielectric relaxation processes. Below TS, approximately linear decrease of with logarithm frequency was attributed to presence dominant ferroelectric phase. Above shows more complicated dependence and Raman modes indicate sudden increase in spatial disorder material, which is ascribed nonpolar...
Large <italic>ZT</italic> enhancement (50%) is obtained in hot forged nanostructured p-type Bi<sub>0.5</sub>Sb<sub>1.5</sub>Te<sub>3</sub> bulk alloys.
At extremely low temperatures, Ag2CaV4O12 was easily synthesized using the traditional solid-state approach. With a relative permittivity (εr) of 7.52, high quality factor (Q × f) 48 800 GHz (f = 13.6 GHz), and temperature coefficient resonance frequency (τf) −77.4 ppm/°C, dense ceramics sintered at 480 °C with outstanding microwave dielectric characteristics were attained. By combining rutile TiO2, composite ceramic balanced properties (τf 3.2 εr 10.96, Q f 49 081 GHz) achieved. No chemical...
Atomic-scale percolation phenomena were found in digenite Cu<sub>x</sub>S, providing a new strategy to optimize the properties of thermoelectric materials, especially for quasi disordered materials.
In this study, (La0.2Nd0.2Sm0.2Ho0.2Y0.2)(Nb1-xVx)O4 (0.1 ≤ x 0.4) ceramics were prepared using a high-entropy strategy via the solid-phase method. The crystal structure, microstructure, vibration modes, and phase transition studied by X-ray diffraction, scanning electron microscopy/transmission microscopy (SEM/TEM), Raman spectroscopy techniques. of was confirmed to be monoclinic fergusonite in range 0.28, tetragonal scheelite 0.3 0.32, complex scheelite, zircon observed when ≥ 0.35. A also...
Abstract In this paper, we investigated the effect of processing parameters and composite regulation on structure property relationship lightweight low‐permittivity Li 2 O–Al O 3 –B dielectric system. BAlO 4 ceramic (1 − x )Li – SrTiO ceramics were synthesized using a conventional solid‐state reaction method. Thermodynamic analysis, sintering temperature, phase formation, crystal structure, microwave properties investigated. Thermal analysis revealed melting temperature 847°C, suggesting...
Disordered layered p-type bismuth telluride was obtained by high pressure (1 GPa) and strain deformation along the c-axis direction of commercially available single crystals. After initial flakes were subsequently fully densified cold pressing (800 MPa at room temperature). As a result severe plastic deformation, samples showed highly anisotropic electrical thermal conductivities. In particular, conductivity measured as low 0.34 W m−1 K−1, which is one lowest values reported for dense...
Abstract Low‐firing and temperature stable microwave dielectric ceramics of Ba 2 LnV 3 O 11 (Ln = Nd, Sm) were prepared by solid‐state reaction. X‐ray diffraction ( XRD ) scanning electron microscopy SEM used to investigate the phase purity, crystal structure, sintering behavior, microstructure. The patterns indicated that belong monoclinic system with P2 1 / c space group in whole range (800°C ‐900°C). Both could be well densified at 880°C for 4 hours relative densities higher than 96%....
Abstract Adjustment on resonance frequency stability against the sintering temperature of Sr 3 V 2 O 8 was realized by adjusting Sr:V mole ratio. Effects ratio behavior and dielectric properties were studied. The sucessfully reduced to 950°C from 1150°C. With increasing vanadium content, both relative permittivity quality factor decreased, while coefficient shifted positive negative values. Especially, a near‐zero τ f −1.1 ppm/°C along with low ( ε r ) 9.8 Q × 24 120 GHz successfully...
Computational fluid dynamics (CFD) was used to investigate characteristics of high-speed air as it is expelled from a solution blow spinning (SBS) nozzle using k-ε turbulence model. Air velocity, pressure, temperature, turbulent kinetic energy and density contours were generated analysed in order achieve an optimal attenuation force for fibre production. A bespoke convergent produce polyvinylidene fluoride (PVDF) fibres at pressures between 1 5 bar. The comprised four parts: polymer syringe...
Fused Filament Fabrication (FFF) is a popular additive manufacturing process for creating prototypes and end-use products. Infill patterns, which fill the interior of hollow FFF-printed objects, play crucial role in determining mechanical properties structural integrity structures. This study investigates effects infill line multipliers different patterns (hexagonal, grid, triangle) on 3D printed Thermoplastic poly lactic acid (PLA) was used as material 3D-printed components. densities 25%,...