mohamed.mohamed4

Dr. Mohammed Hammad Mohammed Fawey

Lecturer - Lecturer

Faculty of science

Address: Physics Department - Faculty of Science - Sohag University, Sohag, Egypt

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Amorphous nickel nanophases inducing ferromagnetism in equiatomic Ni-Ti alloy

2018 | Keywords Amorphous nickel, Molecular dynamics, Magnetic, Atom probe tomography,
Amorphous nickel nanophases inducing ferromagnetism in equiatomic Ni-Ti alloy
Ni50Ti50 nm-sized amorphous particles are prepared using inert-gas condensation followed by in situ compaction. Elemental segregation of Ni and Ti is observed in the consolidated nanostructured material Amorphous, nearly pure Nickel (96%) nanophases form within the amorphous Ni50Ti50 alloy. Combining atom probe tomography and scanning transmission electron microscopy with computer modelling, we explore the formation process of such amorphous nanophase ... Read more

Tailoring of surface plasmon resonances in TiN/(Al0.72Sc0.28)N multilayers by dielectric layer thickness variation

2018 | Keywords TEM, Plasmon resonance,
Tailoring of surface plasmon resonances in TiN/(Al0.72Sc0.28)N multilayers by dielectric layer thickness variation
Alternative designs of plasmonic metamaterials for applications in solar energyharvesting devices are necessary due to pure noble metal-based nanostructures’ incompatibility with CMOS technology, limited thermal and chemical stability, and high losses in the visible spectrum. In the present study, we demonstrate the design of a material based on a multilayer architecture with systematically varying dielectric interlayer thicknesses that result in ... Read more

Void-mediated coherency-strain relaxation and impediment of cubic-to-hexagonal transformation in epitaxial metastable metal/semiconductor TiN/Al0.72Sc0.28N multilayers

2017 | Keywords TEM, Multilayer Films, Hardness,
Void-mediated coherency-strain relaxation and impediment of cubic-to-hexagonal transformation in epitaxial metastable metal/semiconductor TiN/Al0.72Sc0.28N multilayers
Bulk metastable phases can be stabilized during thin-film growth by employing substrates with similar crystal structure and lattice parameter, albeit over a thickness range limited by coherency-strain relaxation. Expanding that strategy, growth of superlattices comprising one stable and another metastable compound with similar crystal structure and lattice parameters are known to yield epitaxial stabilization over a few nanometers of thickness. ... Read more

Compensation of native donor doping in ScN: Carrier concentration control and p-type ScN

2017 | Keywords TEM,
Compensation of native donor doping in ScN: Carrier concentration control and p-type ScN
Scandium nitride (ScN) is an emerging indirect bandgap rocksalt semiconductor that has attracted significant attention in recent years for its potential applications in thermoelectric energy conversion devices, as a semiconducting component in epitaxial metal/semiconductor superlattices and as a substrate material for high quality GaN growth. Due to the presence of oxygen impurities and native defects such as nitrogen vacancies, sputter-deposited ... Read more

Conductivity Optimization of Tysonite-type La1-xBaxF3- x Solid Electrolytes for Advanced Fluoride Ion Battery

2017 | Keywords Fluoride Ion Battery, Impedance spectroscopy, Solid electroyte, Tysonite, Energy storage,
Conductivity Optimization of Tysonite-type La1-xBaxF3- x Solid Electrolytes for Advanced Fluoride Ion Battery
Lithium ion battery is currently the method of choice when it comes to local stationary storage of electrical energy. In the search for an alternative system, fluoride ion battery (FIB) emerges as a candidate due to its high theoretical capacity, and no lithium is needed for its operation. To improve the cycling performance and lower the working temperature of a ... Read more

CuF2 as Reversible Cathode for Fluoride Ion Batteries

2017 | Keywords Copper fluoride CuF2, Electrode/electrolyte interfac, Electron microscopy, Fluoride ion conductors, Solid state batteries,
CuF2 as Reversible Cathode for Fluoride Ion Batteries
In the search for novel battery systems with high energy density and low cost, fluoride ion batteries have recently emerged as a further option to store electricity with very high volumetric energy densities. Among metal fluorides, CuF2 is an intriguing candidate for cathode materials due to its high specific capacity and high theoretical conversion potential. Here, the reversibility of CuF2 ... Read more

In situ TEM Studies of Micron-sized All-solid-state Fluoride Ion Batteries: Preparation, Prospects, and Challenges

2016 | Keywords Fluoride Ion Battery, In situ TEM, Solid-state electrochemistry, Focused ion beam (FIB), All-solid-state-battery,
In situ TEM Studies of Micron-sized All-solid-state Fluoride Ion Batteries: Preparation, Prospects, and Challenges
Trustworthy preparation and contacting of micron-sized batteries is an essential task to enable reliable in situ TEM studies during electrochemical biasing. Some of the challenges and solutions for the preparation of all-solid-state batteries for in situ TEM electrochemical studies are discussed using an optimized focused ion beam (FIB) approach. In particular redeposition, resistivity, porosity of the electrodes/electrolyte and leakage current ... Read more

Electrochemistry in Liquid Environments: Challenges in the Presence of Accelerated Electrons

2016 | Keywords Beam damage, In situ TEM, Electrochemistry, Beam sensitivity,
Electrochemistry in Liquid Environments: Challenges in the Presence of Accelerated Electrons
A meticulous examination of transient stages of dynamic processes at the micrometer, nanometer or atomic scale is the aim in the field of in situ transmission electron microscopy. Studying a specimen in a state close to its native environment without drying possibly leading to structural alterations, triggers research in the field of in situ liquid TEM. However, for any in ... Read more

Ink-Jet Printed CMOS Electronics from Oxide Semiconductors

2015 | Keywords FIB, TEM, AFM, SEM, Field-effect transistor (FET), Oxide semiconductors,
Ink-Jet Printed CMOS Electronics from Oxide Semiconductors
Complementary metal oxide semiconductor (CMOS) technology with high transconductance and signal gain is mandatory for practicable digital/analog logic electronics. However, high performance all-oxide CMOS logics are scarcely reported in the literature; specifi cally, not at all for solution-processed/printed transistors. As a major step toward solution-processed all-oxide electronics, here it is shown that using a highly effi cient electrolyte-gating approach one ... Read more

Duplex treatment of 304 AISI stainless steel using rf plasma nitriding and carbonitriding

2009 | Keywords Surface morphology, Microstructure, Surface hardness, Glow discharge optical spectro, Carbonitriding, Duplex treatment,
Duplex treatment of 304 AISI stainless steel using rf plasma nitriding and carbonitriding
Surface of 304 AISI austenitic stainless steel has been modified using duplex treatment technique of nitriding and carbonitriding. A thick modified nitrided layer, of approximately 20 μm, has been achieved when rf inductively coupled plasma was adjusted at 450 W for processing time of only 10 min. After performing the nitrided layer, the nitrided samples were carbonitrided using the same ... Read more