A. K. Diab

A. K. Diab
Sohag University · departmen of physics

Ph.D.

About

32
Publications
5,578
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169
Citations
Citations since 2016
21 Research Items
137 Citations
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050
Additional affiliations
December 2016 - present
Sohag University
Position
  • Professor (Assistant)

Publications

Publications (32)
Article
Full-text available
Thin layers of (Bi2Se3)1-x(Bi2Te3)x samples were prepared by vacuum thermal evaporation technique. Starting materials are bulk alloys of good crystallinity. Characterization and optical properties of the synthesized films are discussed. Structure properties, surface features and roughness of the deposited films are probed via XRD, SEM and HRTEM tec...
Article
For the first time, Bi2Te3 alloys, which have long been known as promising thermoelectric materials for room temperature applications, have been doped with Na atoms to enhance their thermoelectric performance. Bi2Te3 and Bi2-xNaxTe3 alloys were prepared by mono-temperature melting synthesis. Their structural, crystallographic properties and surface...
Article
Full-text available
The crystallization characteristics for Ge 18 Bi 4 Se 78 glass are studied in this work by means of DTA under the non-isothermal conditions. One stage endothermic glass transition and one exothermic crystallization are observed in the DTA curves. The results of topological constraints for Ge 18 Bi 4 Se 78 glass show that the calculated value of gla...
Article
Herein, thin films of (Bi2Se3)1-x(Bi2Te3)x were synthesized by thermal evaporation in high vacuum using highly crystalline bulk samples of Bi2Se3 alloyed with Bi2Te3. Preparation and characterization together with probing the thermoelectric properties of thin (Bi2Se3)1-x(Bi2Te3)x films are discussed in this article. Crystal structure, surface morph...
Article
Thin Bi2Se3 layers are promising material for many optical and optoelectronic applications. In this work, thin crystalline layers of Bi2-chalcogenides were deposited on highly cleaned glass substrates by vacuum thermal evaporation technique. The optical properties of the concerned layers were investigated with ultraviolet–visible-near infra-red (UV...
Article
In this work, stoichiometric Pb1-xGexTe (x = 0.0, 0.03, 0.06, 0.09, 0.12) crystalline alloys were synthesized using the monotonical temperature melting technique. The synthesized alloys were examined using x-ray diffraction and scanning electron microscope. It was revealed that the crystal structure in all samples is a cubic phase of PbTe. In terms...
Article
In this study, we provide facile procedures for the growth of p-type Bi-doped Sb2Te3 thin films on ceramic substrates using vacuum thermal evaporation technique. Crystal structure and surface morphology of the prepared films were probed via powder X-ray diffraction (PXRD) and scanning electron microscope (SEM). The thermoelectric power properties w...
Article
In this work, it is demonstrated that a higher electrical conductivity can be obtained when Ag atoms, as a transition metal, replaces Bi atoms in the n-type Bi2-xAgxSe3 system. As a result of differences in the atomic mass and size between Ag and Bi, larger Seebeck coefficient is obtained. The concerned Bi2-xAgxSe3 alloys were prepared by melting i...
Article
In this study, pure cadmium oxide (CdO) nanoparticles as well as a mixed gadolinium oxide (Gd2O3)/CdO nanocomposites with mixing contents (0% ≤ Gd2O3 content ≤ 15%) were synthesized via facile precipitation technique followed by calcined treatment. X-ray diffraction analysis illustrated that all samples have high cubic phase purity and well crystal...
Article
The Differential Thermal Analysis DTA technique is used in testing the crystallization kinetics of Pb12Ge12Se76 glass at different heating rates (2.5, 5, 10, 15 and 20 K/min). The glass is thermally stable. The activation energy for glass transitions Eg using Kissinger, Augis-Bennett , and Moynihan models are 89.4, 92.1, and 94.7 kJ/mol respectivel...
Article
Full-text available
ABSTRACT The differential thermal analysis technique is used in testing the crystallization kinetics of Pb12Ge12Se76 glass at different heating rates (2.5, 5, 10, 15, and 20 K/min). The glass is thermally stable. The activation energy for glass transitions Eg using the Kissinger, Augis–Bennett, and Moynihan models is 89.4, 92.1, and 94.7 kJ/mol, re...
Article
Magnetotransport properties and magnetocaloric effect of (La0.7Ba0.3MnO3)1-x/(Al2O3)x composites have been investigated through their theoretical and experimental studies. The Al2O3 addition increases the resistivity, showing up a crossover from 3D Mott to the soft gap variable range hopping (VRH). The relative cooling power of LBMO matrix (~98.77...
Article
The effect of aluminum on (La0.7Ba0.3MnO3)1-x/(Al2O3)x composites is investigated based on their crystal structure, thermoelectric power and magnetic properties. The X-ray diffraction process reveals that the composite still exhibits a rhombohedral perovskite structure (R3¯C) of all composites. The thermoelectric power data satisfies the Magnon and...
Article
Magnetoresistive, magnetic and thermoelectric properties of the La0.7Ba0.3MnO3/xNiO system are studied. The x-ray diffraction shows the coexistence of the NiO and the La0.7Ba0.3MnO3 phases in doped composites, revealing their interaction lack. This suggests the precipitation of the NiO at grain boundaries and on the La0.7Ba0.3MnO3 surface, interrup...
Article
Full-text available
(Nd0.6Sr0.4MnO3)1-x/(CrO3)x with x = 0.0–0.030 step 0.005 weight% composites have been prepared by the solid state reaction process. The X-ray and scanning electron microscopic manifest that all composites are a single orthorhombic phase and there are no CrO3 grains separated from NdSrMnO matrix. The electrical measurements have revealed an increas...
Article
This investigation is mainly concerned with the effect of annealing temperature (600, 700, 800 and 900 °C) in air for (La0.7Ba0.3MnO3)1-x/(NiO)x with x = 0 and x = 0.10 samples. It was shown that the annealing temperature does not affect the structure and parameters of rhombohedral lattice of the samples. However, it is observed that the annealing...
Article
Full-text available
The effect of annealing temperature on structural, electrical and magnetic properties of bulk (Nd0.6Sr0.4MnO3)0.99/(CrO3)0.01 and (Nd0.6Sr0.4MnO3)0.98/(CrO3)0.02 compositions are investigated. X-ray diffraction show that (Nd0.6Sr0.4MnO3)1-x/(CrO3)x(NSMOC) crystallize in a single-phase rhombohedral structure for the as-prepared and annealed samples....
Article
Full-text available
Thin films of aluminum zinc oxide are prepared using DC magnetron sputtering. It was found that changing the thickness of the film as well as the pressure of the argon affects the transmittance, optical gap, width of the band tails of the localized state, refractive index, and real and imaginary parts of the dielectric function. The real and imagin...
Article
(La0.7Sr0.3MnO3)1-x/(ZrO2)x (x = 0.0–0.150, step 0.025) composites have been prepared via solid state reaction process. The X-ray diffraction and scanning electron microscopic observations indicate that there are ZrO2 grains separated from La0.7Sr0.3MnO3 matrix. It has been found that the inclusion of ZrO2 content decreases the conductivity, magnet...
Article
The structural and electrical properties of the as-prepared and annealed In45Sb35Se20-xTex thin films with different compositions (x = 2.5, 5, 7.5, 10, 12.5 and 15 at. %) prepared by electron beam evaporation method are studied. The XRD patterns of the as-prepared thin film show that the investigated compositions have amorphous and polycrystalline...
Article
Full-text available
Ultralong CdO nanowires (NWs) were synthesized on Au coated Si and quartz substrates by using vapor transport method. The synthesis temperature was chosen via thermal gravimetry analysis (TGA) and it was 1150 degrees C. The formation of CdO was confirmed by energy dispersive analysis of X-ray (EDAX) and Fourier transform infrared (FT-IR) spectrosco...
Article
Full-text available
We have investigated the volume collapse occurring in LaMnO3 unit cell using the anisotropic Potts model modified by two types of anisotropic interactions which has been used to study the change of Mn-O bonds lengths as function of temperature. The bond lengths are related to the occupation of the orbits. The lattice parameters and the distortion m...
Article
Full-text available
Chalcogenide bulk alloys of Ge10AsxTe90−x (x = 20, 25, 30, 35, 40, 45 and 55) system were prepared by the conventional melt quench-technique. The dc electrical conductivity σ and thermoelectric power (TEP) measurements were carried out in the temperature ranges from 83 to 353 K and from 253 to 353 K, respectively. The variations of both σ and TEP w...
Article
Full-text available
The temperature dependence of the resistivity (ρ) and magneto-resistance (MR) effect of La1−x Li x MnO y (x=0.05, 0.1, 0.15, 0.2 & 0.25 at.%) fixed valence doped compounds were studied between 80 and 320 K. X-ray powder diffraction (XRD) at room temperature shows that the samples are single phase. The resistivity of all samples with and without ma...
Article
Physical properties of In35Sb45Se20−xTex thin films with different compositions (x=2.5, 5, 7.5, 10, 12.5 and 15 at %) prepared by electron beam evaporation method are studied. X-ray diffraction results indicate that the as-evaporated films depend on the Te content and the crystallized compounds consist mainly of Sb2Se3 with small amount of Sb2SeTe2...
Article
I–V measurements and temperature dependence of electrical conductivity on polycrystalline samples of Bi2Se3 and SnBi4Se7 have been performed. From the analysis of the temperature dependence of electron concentration in the activation regime above room temperature, the effective mass me* has been determined. Some intrinsic and contact properties suc...
Article
Full-text available
Chalcogenide glasses with Ge10AsxTe90-x ( x = 20, 25, 30, 35, 40, 45 and 55 at.%) were prepared by melt quenching technique. The glass transition temperature, the crystallization temperature, the melting temperature and the glass-forming tendency were determined from the differential scanning calorimetry measurements. The structural and optical pro...
Article
Chalcogenide bulk alloys of Agx (As0.4Se0.6) 100-x (x=5, 7.5, 10, 12.5, 15 and 17.5) system were prepared by the conventional melt-quench technique. The d.c. electrical conductivity (sigma) and thermoelectric power (TEP) measurements were carried out in the temperature range from 83 to 373 K and from 253 to 373 K, respectively. Variations of both s...
Article
A hybrid cryogenic refrigeration cycle that combines a turbomachine‐based, reverse‐Brayton lower stage with a pulse‐tube upper stage avoids the inherent losses associated with a regenerator at low temperature and therefore has the potential for high performance. One of the key technical issues relative to the successful development of this cryocool...

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