SMAIL Lamara
اسماعيل لعمارة
smail.lamara@univ-msila.dz
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- MI - Joint Basci Teaching Department
- Faculty of Mathematics and Informatics
- Grade PHd
About Me
Location
Msila, Msila
Msila, ALGERIA
Code RFIDE- 2020-02-05 00:00:00
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SMAIL Lamara birthday
- 2023-10-27
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2023-10-27
Crystallization Kinetics Study of α-Cordierite from MgO– Al2O3–SiO2–TiO2
Crystallization Kinetics Study of α-Cordierite from MgO– Al2O3–SiO2–TiO2 Ameur OUALI , Smail LAMARA, Foudil SAHNOUNE Physics and materials chemistry laboratory, Department of Physics, University of M’sila, 28000 M’sila, ALGERIA ABSTRACT Using DTA/TG thermal analysis, X-ray diffraction (XRD), and scanning electron microscopy (SEM), crystallization kinetics of -cordierite ceramic from MgO–Al2O3–SiO2– TiO2 glasses obtained through melt cooling are presented. Under 40 cm3/min argon gas flow, DTA experiments were carried out on samples ranging from room temperature to 1400 °C. This study utilized heating rates of 10, 20, 30, 40, and 50 °C/min. The sintered powders' phase transformations were characterized by XRD. Using DTA results, the activation energy values for cordierite formation were measured under both non-isothermal (Kissinger, Boswell, and Ozawa methods) and non-isothermal (Johnson–Mehl–Avrami (JMA) theory) treatments of 845 and 720 kJ mol-1, respectively. When non-isothermal treatments were used, the growth morphology parameters n (the Avrami parameter) were found to be close to 1.5, when isothermal treatments were used (the Ligero method), and Matusita et al. found that m (the numerical factor) was 1.5. The fact that the growth morphology parameters n and m are approximately 1.5 indicates a diffusion-controlled polyhedron-like three-dimensional growth from a constant number of nuclei. Keywords: Cordierite, Differential thermal analysis, Avrami parameter, Activation energy Corresponding Author
Citation
Ameur Ouali , Foudil SAHNOUNE , smail LAMARA , ,(2023-10-27), Crystallization Kinetics Study of α-Cordierite from MgO– Al2O3–SiO2–TiO2,10th INTERNATIONAL CONFERENCE ON COMPUTATIONAL AND EXPERIMENTAL SCIENCE AND ENGINEERING (ICCESEN-2023) 27-30 October 2023, ANTALYA-TURKEY,ANTALYA-TURKEY
- 2022-06-15
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2022-06-15
Kinetics of mullitization from sol-gel synthesized precursors
The aim of this study is to shed more light on the formation of mullite and the kinetics of mullitization from sol-gel synthesized precursors. Tetraethylorthosilicate (TEOS) and aluminum nitrate nonahydrate (ANN) were used, as a source of silica and alumina, respectively, for the synthesis of homogenous mullite precursor powder. The mullitization process was characterized by thermogravimetry (TG), differential thermal analysis (DTA), thermodilatometric analysis (TDA), and x-ray powder diffraction (XRD) techniques. It was found that mullite started to crystalize at temperatures of 1050, 1200, and 1241 °C as determined by XRD, DTA, and TDA, respectively. Mullite crystallization kinetics was thoroughly investigated under isothermal and non-isothermal conditions using DTA. The activation energy for mullite formation was calculated, for different crystallization fractions, following the Freidman, Kissinger, Boswell, and Ozawa methods. The average values were found to be 1282.92, 1324.30, 1336.93, and 1283.09 kJ/mol, respectively. The kinetic parameters and the crystallization mechanism were determined and the results were compared with those available in the literature. The Sestak Berggren SB(m,n) model was found to be the most suitable for the determination of mullite crystallization mechanism. The calculated average values of the Gibbs free energy (ΔG#), enthalpy (ΔH#), and entropy (ΔS#) for mullite formation, at different heating rates, were 433.98 kJ/mol, 1294.20 kJ/mol, and 566.23 J/mol.K, respectivel
Citation
smail LAMARA , Foudil SAHNOUNE , KHADIDJA Laziri , nouari@kfupm.edu.sa, djaidaredaoui@gmail.com, , (2022-06-15), Kinetics of mullitization from sol-gel synthesized precursors, Journal of the Indian Chemical Society, Vol:99, Issue:6, pages:8, Professor Ganapati D. Yadav
- 2022
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2022
Kinetics of α-cordierite formation from nano-oxide powders
This work reports, for the first time, the kinetics of α-cordierite (Mg2Al4Si5O18) formation from Al2O3, SiO2, and MgO nano-oxide powders. Isothermal and non-isothermal kinetic analysis was performed by Differential Thermal Analysis (DTA) and thermodilatometric analysis (TDA). The thermal measurements were performed at high heating rates (20–70 ◦C/min) for DTA and low rates (3–9 ◦C/min) for TDA. Phase transformations leading to the formation of α-cordierite were characterized by x-ray diffraction (XRD). The Kissinger, Boswell, and Ozawa methods were used to calculate the activation energy. The Avrami parameter (n) and dimensionality of crystal growth (m) were calculated using the Augis–Bennett and Matusita equations, respectively. Analysis of samples heated in the DTA equipment or the dilatometer confirmed that the reaction of MgO, Al2O3, and SiO2 led to the formation of enstatite, cristobalite, and metastable μ-cordierite. The later transformed to stable α-cordierite. The activation energy calculated by both isothermal and non-isothermal treatments is 633 and 667 kJ/mol, respectively, for DTA; and is 544 and 646 kJ/mol, respectively, for TDA. The growth morphology parameters n and m, obtained from isothermal and non-isothermal DTA treatments, are both close to 2 indicating that bulk nucleation with constant number of nuclei is dominant in α-cordierite crystallization followed by two- dimensional growth of α-cordierite crystals with plate-like morphology controlled by interface reaction. While those obtained from isothermal and non-isothermal TDA treatments, are both about 1.5 indicating that bulk nucleation is dominant in α-cordierite crystallization followed by three-dimensional growth of α-cordierite crystals with polyhedron-like morphology controlled by diffusion from a constant number of nuclei. A low co-efficient of thermal expansion (CTE) of 0.9 × 10 6/◦C was measured, in the range 200–1350 ◦C, for a sample sintered at 1400 ◦C for 2 h.
Citation
Foudil SAHNOUNE , smail LAMARA , nouari@kfupm.edu.sa, , (2022), Kinetics of α-cordierite formation from nano-oxide powders, Ceramics International, Vol:48, Issue:, pages:23921-23930, P. Vincenzini
- 2022
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2022
Kinetic analysis of the formation of magnesium aluminate spinel (MgAl2O4) from α-Al2O3 and MgO nanopowders.
This work reports on the formation kinetics of magnesium aluminate spinel (MAS), from α-Al2O3 and MgO nanopowders. A non-isothermal kinetic analysis was performed by the thermodilatometric analysis (TDA) for the first time. The measure- ments were carried out using a dilatometer on compact samples with heating rates from 3 to 11 °C min–1. Phases formed during the spinelisation process, in specimens heat-treated in both the dilatometer and furnace, were characterized by X-ray diffraction (XRD). The use of pure nano-oxide powders to produce spinel reduced the formation temperature and activation energy. MAS started to form, in the furnace heat-treated specimens, at 1000 °C and its formation was complete at 1400 °C. For specimens heated in the dilatometer, MAS formation temperature increased from 1002 to 1061 °C with the increase in heating rate from 3 to 11 °C min−1. The activation energy for spinelisation, under non-isothermal conditions, was calculated by linear reaction models (Integral isoconversional methods) using Flynn–Wall–Ozawa (FWO) method. Boswell, and Kiss- inger equations. The average activation energy (Ea), correlation coefficient (R2), Avrami parameter (n), and dimensionality of crystal growth (m) were equal to 293.31 kJ mol−1, 0.99, 1.22, and 0.98, respectively. The Johnson–Mehl–Avrami (JMA) reaction model, following Ligero method (Differential isoconversional methods), was used to analyze spinelisation kinetics under non-isothermal conditions. The average activation energy (Ea), correlation coefficient (R2), Avrami parameter (n), and the frequency factor (k0) were found to be 283.90 kJ mol−1, 0.99, 1.2, and 4.17 × 108 s−1, respectively. Keywords Spinel · MgAl2O4 · Nanopowders · Thermodilatometric analysis · Spinelisation kinetics
Citation
Foudil SAHNOUNE , smail LAMARA , nouari@kfupm.edu.sa, , (2022), Kinetic analysis of the formation of magnesium aluminate spinel (MgAl2O4) from α-Al2O3 and MgO nanopowders., Journal of Thermal Analysis and Calorimetry (2022) 147:11549–11559, Vol:147, Issue:, pages:11549–11559, I.M. Szilágyi
- 2021
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2021
Microstructure, thermal expansion, hardness and thermodynamic parameters of cordierite materials synthesized from Algerian natural clay minerals and magnesia
Low-cost, dimensionally stable, and hard cordierite ceramic materials were prepared by reaction sintering two Algerian natural clay minerals and synthetic magnesia. The microstructure and hardness of the developed materials were characterized by a scanning electron microscope and a hardness tester, respectively. Differential thermal analysis, dilatometry, and Raman spectroscopy were used to analyze the transformation of phases and sintering behavior. The coefficient of thermal expansion (α) was determined from dilatometry experiments. The microstructure of DT00M sample synthesized from stoichiometric powder mixture (clay minerals and synthetic magnesia) consisted of cordierite only. Whereas cordierite, magnesium silicate, and sapphirine phases were present in DT04M and DT08M samples prepared from non-stoichiometric powder mixtures containing excess magnesia of 16 and 20 wt.%, respectively. The values of the activation energy (Ea) and frequency factor (A), for cordierite crystals, varied from 577 to 951 kJ/mol, and 1.54 × 1018 to 1.98 × 1030 S−1, respectively. The kinetic parameter n for the formation of cordierite had values between 2 and 3. While the Gibbs free energy (ΔG#), enthalpy (ΔH#), and entropy (ΔS#) values were found to be in the range 431–483 kJ/mol, 564–938 kJ/mol, and 70–313 J/mol, respectively. Samples sintered at 1300 °C for 2 h showed higher values of hardness compared with those sintered at 1250 °C. The DT04M sample had the highest hardness value of 9.45 GPa, demonstrating an increase of 12.5% with respect to monolithic cordierite (DT00M). In the temperature range 100–1300 °C, DT04M and DT08M samples showed better dimensional stability compared to monolithic cordierite. The DT08M sample showed the lowest thermal expansion (α = 2.32 × 10−6/°C), demonstrating a decrease of 31.3% with respect to monolithic cordierite.
Citation
smail LAMARA , Foudil SAHNOUNE , MENAD Heraiz , redaaoui djida, Nouari Saheb, , (2021), Microstructure, thermal expansion, hardness and thermodynamic parameters of cordierite materials synthesized from Algerian natural clay minerals and magnesia, Boletín de la Sociedad Española de Cerámica y Vidrio, Vol:60, Issue:5, pages:291-306, ELSEVIER
- 2020
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2020
Formation of anorthite containing cordierite materials through reaction sintering kaolin, MgO and CaO precursors
The effect of CaO on cordierite formation from kaolin-MgO-CaO powder mixtures, milled for 5 h and reaction sintered for 2 h in the temperature range 900-1400 °C, was investigated. Phases formed in the developed materials were characterized by x-ray powder diffraction method (XRD) and Raman spectroscopy. Non-isothermal differential thermal analysis (DTA) and thermogravimetric (TG) experiments were performed from room temperature to 1400 °C, at heating rates from 20 to 40 °C/min. Activation energies were determined using Kissinger method. It was found that sintering the stoichiometric kaolinmagnesia mixture led to the nucleation and growth of monolithic cordierite; while cordierite along with anorthite were present in the other two samples where 4 or 8 wt% of CaO was added. The increase in CaO decreased cordierite formation temperature and increased the activation energy, which ranged from 445 to 619 kJ/mol for μ-cordierite and from 604 to 1335 kJ/mol for α-cordierite. Keywords: Clays; MgO; Cordierite; Sintering; Kinetics
Citation
smail LAMARA , Foudil SAHNOUNE , MENAD Heraiz , Redaoui Djida, Nouari Saheb, , (2020), Formation of anorthite containing cordierite materials through reaction sintering kaolin, MgO and CaO precursors, Science of Sintering,, Vol:52, Issue:2, pages:135-147, INT INST SCIENCE SINTERING (I I S S)
- 2019
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2019
The kinetics parameters of cordierite materials synthesized via sol-gel route using Differential Thermal Analysis (DTA)
Cordierite (Mg2Al4Si5O18) formation via sol-gel route using Tetraethyl orthosilicate TEOS, Aluminum nitrate nonahydrate Al(NO3)3.9H2O, and Magnesium nitrate hexahydrate Mg(NO3)2.6H2O as starting materials was studied by means of high-temperature by heating from room temperature up to 1350 °C. Differential thermal analysis (DTA) technique, under non-isothermal conditions is the appropriate for studying high-temperature reaction kinetics. The activation energies and kinetics parameters of cordierite formation measured by both isothermal (Johnson–Mehl–Avrami (JMA) theory using Ligero method) and non-isothermal (Ozawa, Boswell and Kissinger methods) treatments. The growth morphology parameters n (Avrami parameter which indicates the crystallization mode) and m (a numerical factor which depends on the dimensionality of crystal growth) were also determined. Powders obtained were characterized using high temperature x-ray powder diffraction (XRD), and Scanning electron microscopy (SEM). Finally, the thermodynamic parameters (ΔG#, ΔH# and ΔS#) for cordierite crystals were determined.
Citation
Fatima Zohra MEZAHI , smail LAMARA , Foudil SAHNOUNE , ,(2019), The kinetics parameters of cordierite materials synthesized via sol-gel route using Differential Thermal Analysis (DTA),6 th International Conference on computational and Experimental Science and Engineering (ICCESEN-2019),Antalya, Turquie
- 0023-10-30
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0023-10-30
Crystallization Kinetics Study of α-Cordierite from MgO– Al2O3–SiO2–TiO2
ABSTRACT Using DTA/TG thermal analysis, X-ray diffraction (XRD), and scanning electron microscopy (SEM), crystallization kinetics of -cordierite ceramic from MgO–Al2O3–SiO2– TiO2 glasses obtained through melt cooling are presented. Under 40 cm3/min argon gas flow, DTA experiments were carried out on samples ranging from room temperature to 1400 °C. This study utilized heating rates of 10, 20, 30, 40, and 50 °C/min. The sintered powders' phase transformations were characterized by XRD. Using DTA results, the activation energy values for cordierite formation were measured under both non-isothermal (Kissinger, Boswell, and Ozawa methods) and non-isothermal (Johnson–Mehl–Avrami (JMA) theory) treatments of 845 and 720 kJ mol-1, respectively. When non-isothermal treatments were used, the growth morphology parameters n (the Avrami parameter) were found to be close to 1.5, when isothermal treatments were used (the Ligero method), and Matusita et al. found that m (the numerical factor) was 1.5. The fact that the growth morphology parameters n and m are approximately 1.5 indicates a diffusion-controlled polyhedron-like three-dimensional growth from a constant number of nuclei. Keywords: Cordierite, Differential thermal analysis, Avrami parameter, Activation energy
Citation
Foudil SAHNOUNE , Ameur Ouali , smail LAMARA , ,(0023-10-30), Crystallization Kinetics Study of α-Cordierite from MgO– Al2O3–SiO2–TiO2,10th INTERNATIONAL CONFERENCE ON COMPUTATIONAL AND EXPERIMENTAL SCIENCE AND ENGINEERING (ICCESEN-2023) 27-30 October 2023, ANTALYA-TURKEY,ANTALYA-TURKEY