mohamed.mohamed4

Assoc. Prof. Mohammed Hammad Mohammed Fawey

Assistant Professor - Lecturer

Faculty of science

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

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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

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

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

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

Reversible In-Situ TEM Electrochemical studies of Fluoride Ion Battery

2014 | Keywords In-Situ TEM,
Reversible In-Situ TEM Electrochemical studies of Fluoride Ion Battery
In addition to further developments in Li-ion batteries, new research directions are focusing on further improvements of the battery performance. Alternative technologies are investigated based on different chemistries using, e.g., sodium, magnesium or chloride as charge transfer ions in secondary batteries. Batteries based on a fluoride ion shuttle (fluoride ion battery) are an interesting alternative to Li-ion batteries as they ... 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

Duplex treatment of AISI 304 austenitic stainless steel using rf nitriding and dc reactive magnetron sputtering of titanium

2008 | Keywords Duplex treatment, Titanium nitride, Glow discharge optical spectro, Microstructure, Surface hardness,
Duplex treatment of AISI 304 austenitic stainless steel using rf nitriding and dc reactive magnetron sputtering of titanium
In this work, duplex treatment has been carried out using radio frequency (rf) plasma nitriding process and direct current (dc) magnetron sputtering of titanium. Nitriding of AISI 304 stainless steel, using rf plasma technique, created a thick modified layer of approximately 20 μm for short plasma processing time of 10 min. After nitriding process, a thin titanium nitride film has ... Read more