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Temperature dependence of the electrical resistivity and absolute thermoelectric power of amorphous metallic glass Ni33.3Zr66.7
(Journal des solides non cristallins Volume 481 ,1er février 2018, Pages 352-360, 2018-02-01) B. Smili; A. Messaoud; W. Bouchelaghem; L. Abadlia; N. Fazel; A. Benmoussa; I. Kaban; F. Gasser; J.G Gasser
Electron transport properties and thermal stability of Ni33.3Zr66.7 metallic glass (MG) have been studied using an original device for simultaneous measurements of electrical resistivity and absolute thermoelectric power (ATP) controlled by a LabView software written by one of us. The electrical resistivity and absolute thermoelectric power were measured simultaneously and very accurately over a temperature range from 25 to 400 °C with a nominal heating rate of 0.5 K min−1. The electronic thermal conductivity was also determined using the Wiedemann–Franz law in the same temperature range. Due to its high efficiency, this technique is more and more used because it is characterized by a high sensitivity to detection of the phase transitions related to electronic transport, which is the aim of this study. Analysis of the temperature dependence of the resistivity and ATP of the Ni33.3Zr66.7 glassy ribbons proves the potential of this characterization method to study the thermal behavior of metallic glasses. The crystal structure and the morphology of Ni33.3Zr66.7 metallic glass in the asquenched state and after heat treatments were studied using X-ray diffraction (XRD), and scanning electron microscope (SEM)
Experimental and computational investigations on mechanically alloyed Fe55Co30Ni15 powders
(Powder Technology, 2023-12-03) Abdelkrim Houssou; Samia Amirat; Hana Ferkous; Safia Alleg; Karima Dadda; Rahima Boulechfar; Lakhdar Abadlia; Wahiba Bouchelaghem; Javed Khan Bhutto; Maha Awjan Alreshidi; Krishna Kumar Yadav; Noureddine Elboughdiri; Alessandro Erto; Yacine Benguerba
Nanocrystalline Fe55Co30Ni15 powder alloy was created via mechanical alloying in a planetary ball mill (Fritsch P7) under an argon atmosphere. Structural, microstructural, and magnetic features were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDX), and vibrating sample magnetometry (VSM). The results indicated a coexistence of body-centered cubic (BCC) and face-centered cubic (FCC) solid solutions, with BCC being predominant (96%) and displaying an average grain size of 11 nm. Both BCC and FCC phases exhibited a significant density of dislocations (~1016 per square meter). The powder alloy demonstrated soft magnetic behavior with a saturation magnetization of 206.5 emu/g and a coercivity of 32.63 Oe, indicative of multidomain properties based on the Mr./Ms. ratio. Theoretical analysis confirmed precise computational simulation parameters at room temperature.
New experimental methodology, setup and LabView program for accurate absolute thermoelectric power and electrical resistivity measurements between 25 and 1600 K: Application to pure copper, platinum, tungsten, and nickel at very high temperatures
(Review of Scientific Instruments 85, 095121 (2014); doi: 10.1063/1.4896046, 2014-09-29) L. Abadlia; F. Gasser; K. Khalouk; M. Mayoufi; J. G. Gasser
In this paper we describe an experimental setup designed to measure simultaneously and very accurately the resistivity and the absolute thermoelectric power, also called absolute thermopower or absolute Seebeck coefficient, of solid and liquid conductors/semiconductors over a wide range of temperatures (room temperature to 1600 K in present work). A careful analysis of the existing experimental data allowed us to extend the absolute thermoelectric power scale of platinum to the range 0-1800 K with two new polynomial expressions. The experimental device is controlled by a LabView program. A detailed description of the accurate dynamic measurement methodology is given in this paper. We measure the absolute thermoelectric power and the electrical resistivity and deduce with a good accuracy the thermal conductivity using the relations between the three electronic transport coefficients, going beyond the classical Wiedemann-Franz law. We use this experimental setup and methodology to give new very accurate results for pure copper, platinum, and nickel especially at very high temperatures. But resistivity and absolute thermopower measurement can be more than an objective in itself. Resistivity characterizes the bulk of a material while absolute thermoelectric power characterizes the material at the point where the electrical contact is established with a couple of metallic elements (forming a thermocouple). In a forthcoming paper we will show that the measurement of resistivity and absolute thermoelectric power characterizes advantageously the (change of) phase, probably as well as DSC (if not better), since the change of phases can be easily followed during several hours/days at constant temperature. © 2014 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4896046]
Effect of silver addition on the structure of microwave-synthesized CuAg solid solutions for organic pollutant degradation
(Applied Physics A (2026) 132:102 https://doi.org/10.1007/s00339-025-09234-y, 2026-01-20) Hanene Mehani; Souad Djerad; Safia Alleg; Lakhdar Abadlia; Mourad Ibrahim Daoudi; Daniela Caschera
This study reports the one-pot microwave synthesis of Cu-Ag powders with varying copper-to-silver molar ratios (10:1, 5:1, 2:1, and 1:1) via the reduction of copper and silver salts using ascorbic acid. The resulting products were systematically analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and electrical resistivity measurements. XRD results reveal the coexistence of Cu-rich Cu(Ag) and Ag-rich Ag(Cu) solid solutions, with the weight fraction of Cu(Ag) decreasing as Ag content increases. The crystallite size ranges from 82 to 231 nm. Increasing Ag content disrupts the Cu lattice, enhances electron scattering, and reduces charge carrier mobility, leading to a significant increase in electrical resistivity, with ρ= 3.14 Ω·cm for CuAg10/1 and 6.71 Ω·cm for CuAg1/1. The solid solutions display an oxidizing property in aqueous medium, which diminishes as Ag content increases. The oxidation of Methylene Blue (MB), used as a test molecule, occurs via an indirect process where the powder generates hydroxyl radicals in the acidic medium. Complete degradation of MB with CuAg 10/1 occurs within 25 min using 30 mg of the powder at 60 °C and pH 3. The processing time is further reduced to 6 min when the degradation is conducted under microwave irradiation.
Crystallization process, microstructure, thermal behavior, and magnetic properties of melt‑spun Fe86Cr6P6C2 ribbons
(Applied Physics A (2023) 129:487 https://doi.org/10.1007/s00339-023-06745-4, 2023-06-15) L. Abadlia; M. I. Daoudi; S. Alleg
The crystallization process, microstructure, thermal stability, and magnetic properties of Fe86Cr6P6C2 amorphous ribbons were studied by X-ray difraction, scanning electron microscopy coupled with energy dispersive X-ray spectroscopy, differential scanning calorimetry, and vibration sample magnetometry. The crystallization process occurs in three stages where nanocrystalline α-Fe solid solution, Fe3P phosphide, θ-Fe3C and ε-Fe3C carbides are formed. The crystallite size increases with increasing annealing temperature and remains at the nanometer scale (20–88 nm). The microstructure of the annealed ribbons consists of lamella, fne platelets, alternate planes of ferrite and cementite, and grains with diferent shapes and sizes. The activation energies (499, 386, and 369 kJ/mol) are determined by Kissinger method. The melt-spun ribbons exhibit a low coercivity of 16.598 Oe and a high saturation magnetization of 0.635 emu compared to the annealed ones. The saturation magnetization decreases to a minimum value for the annealed ribbons at 758 K and then increases with increasing the annealing temperature. The Curie temperature increases from 447.4 K for the melt-spun ribbons to 638 K for the fully crystallized ribbons due to the development of the α-Fe phase.