KHADIDJA Laziri
لعزيري خديجة
khadidja.laziri@univ-msila.dz
0675672707
- Departement of Physics
- Faculty of Sciences
- Grade PHd
About Me
Sciences de la Matière
Filiere
Physique
Physics of Materials
Location
Msila, Msila
Msila, ALGERIA
Code RFIDE- 1996-08-05 00:00:00
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KHADIDJA Laziri birthday
- 2024-11-15
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2024-11-15
Kinetics of formation, microstructure, and properties of monolithic forsterite (Mg2SiO4) produced through solid-state reaction of nano-powders of MgO and SiO2
The synthesis of forsterite can be challenging because the initial oxides react slowly and undesirable compounds like enstatite (MgSiO3) can form instead of forsterite (Mg2SiO4). Although several methods have been developed to overcome these challenges, the synthesis of forsterite using the solid-state reaction of nanopowders has not been investigated. This study aims to explore the possibility of producing forsterite by reacting MgO and SiO2 nano-powder. The initial oxides were wet ball milled, dried, and reaction sintered. Spectroscopy and microscopy methods were used to analyze the formed phases and study the formation kinetics. The density, coefficient of thermal expansion (CTE), and hardness of sintered samples were measured using a densimeter, a dilatometer, and a hardness tester, respectively. The results demonstrated that it is possible to synthesize forsterite by solid state reaction of pure MgO and SiO2 nano-powders. The reaction between the two compounds begins at a temperature as low as 860 °C and leads to the formation of forsterite by a two-step formation mechanism. The first reaction involves the reaction of MgO and SiO2 to form enstatite, and the second one produces forsterite as a result of enstatite reacting further with MgO. The activation energy values ranged from 1028.89 to 1105.655 kJ/mol for the formation of forsterite, and from 456.316 to 488.08 kJ/mol for the formation of enstatite. Monolithic forsterite was completely formed at a low temperature of 1200 °C for a relatively short duration of 2 h. The sample sintered at 1400 °C for 2 h, had a density of 2.96 g/cm3, a Vickers hardness of 7.64 GPa, and a coefficient of thermal expansion of 10.24 × 10−6/K measured in the temperature range of 200–1300 °C.
Citation
KHADIDJA Laziri , AMAR Djemli , Foudil SAHNOUNE , Djaida Redaoui, Essebti Dhahri, Syed Fida Hassan, Nouari Saheb, , (2024-11-15), Kinetics of formation, microstructure, and properties of monolithic forsterite (Mg2SiO4) produced through solid-state reaction of nano-powders of MgO and SiO2, Ceramics International, Vol:50, Issue:22, pages:10, Elsevier
- 2024-07-05
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2024-07-05
Effect of SiO2 Addition on The Thermal and Mechanical Properties of Forsterite from MgO and SiO2 Nano-powders
Enhancing the thermal and mechanical properties of forsterite-based ceramics is critical for high-temperature applications that require high thermal stability and mechanical durability. This work utilized a solid-state reaction approach, employing SiO2 and MgO nano-oxides as precursors, to determine the kinetic parameters, and crystallization mechanism and enhance the thermal and mechanical properties of forsterite ceramics. A series of forsterite-based ceramics (where SiO2 Addition is x: 0, 1.5, 3, 4.5, and 6 Wt. %) were prepared to examine the effect of SiO2 addition on the thermal expansion coefficient, density, and open porosity within different sintering temperatures. The results indicate a significant decrease in the thermal expansion coefficient (TEC) to 7.929×10-6 °C-1, open porosity to 0 %, and an increase in apparent density to 2.86 g/cm3, correlated to the increased enstatite phase formation due to higher SiO2 content in samples. DL and XRD study confirms the formation of pure forsterite. The reaction model, mechanism, and kinetic parameters (n, m) were derived from differential thermal analysis of forsterite crystallization at different heating rates. A reaction model based on the Sesták-Berggren (SB) model was employed, and the kinetic parameters (n, m) and ln(A) were found to be 1.07, 0.487, and 111.93, respectively. Forsterite crystallization's reaction mechanism predominantly involves spherical grain growth through diffusion.
Citation
KHADIDJA Laziri , ,(2024-07-05), Effect of SiO2 Addition on The Thermal and Mechanical Properties of Forsterite from MgO and SiO2 Nano-powders,7th International Conference On Smart Materials and Spectroscopy,Monastir, Tunisia
- 2024-06-05
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2024-06-05
Kinetic and microstructure analyses of enstatite formation from nano-oxides
In this work, we prepared a forsterite-enstatite composite using the solid-state reaction method, using nano-oxides through the sintering process. Advanced techniques like (DTA, XRD, SEM, and EDS complementary techniques were used. Our thermal analysis showed a lower heating rate of 2°C/min; the estatite phase formation was detected as the first peak and forsterite phase formation as the second peak using DTA analysis. Model-free methods were used to determine the activation energy of enstatite crystallization, such as Kissinger-Akahira-Sunose (KSA), Flynn–Wall–Ozawa (FWO), Kissinger, Ozawa, and Boswell methods. The activation energy of enstatite is constant while decreasing as a function of crystallization fraction. Based on the experimental data, S ̃esta ́k Berggren (SB) model was found to be suitable in describing the kinetic model; the kinetic parameters (n, m) and ln(A) were 1.06, 0.53 and 48.60, respectively, for enstatite. The enstatite mechanism reaction was controlled by nucleation followed by linear nuclei growth. The SEM/ EDS analyses of the forsterite-enstatite sample confirmed the reaction mechanism, where a secondary enstatite phase with rod shape grains length of 0.68 µm. EDS analysis detected an elemental composition matching the theoretical composition of enstatite and forsterite.
Citation
KHADIDJA Laziri , ,(2024-06-05), Kinetic and microstructure analyses of enstatite formation from nano-oxides,National Seminar on Nanomaterials : Synthesis and Applications,University of M'hamd Bougara of Boumerdes
- 2024-05-06
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2024-05-06
The effect of magnesium silicate on the thermal and other properties of forsterite ceramics from nano-powder
Our work used the solid-state reaction method to synthesize forsterite-based ceramics (xFMS) powders from MgO and SiO2 nano-oxides. comprehensive analyses were employed through advanced techniques like DSC, SEM, and EDS. The DSC results revealed the crys-tallization of pure forsterite. The results of the proposed method confirm noticeable ad-vantages like fast reaction and pure forsterite production in sample 100F00MS. Thermal ex-pansion coefficient TEC decreases with enstatite phase increasing in xFMS samples. The formed forsterite grain size was 10.22 µm, with an average grain area of 51.8 µm2, and with homogenous elemental distribution, high apparent density and open porosity of 0 %. This work suggests that forsterite-prepared composites have suitable properties for refractory and packaging applications.
Citation
KHADIDJA Laziri , ,(2024-05-06), The effect of magnesium silicate on the thermal and other properties of forsterite ceramics from nano-powder,Le 2éme colloque national de chimie (CNC2@2024),Université Mohamed Boudiaf- M'sila
- 2023-12-02
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2023-12-02
Thermal analysis of Hydroxyapatite-Forsterite coumpond synthesized via bovine bone and nano-oxides powders
Hydroxapatite Ca10(PO4)6(OH)2 is one of the most important biological materials, due to its compatibility, good bioactivity and its closeness to that of bones. The main aim of this work is to synthesize Hydroxyapatite-Forsterite (Ca10(PO4)6(OH)2) -(Mg2SiO4) compound using natural source (bovine bone) and nanomaterials oxides (MgO, SiO2), respectively as starting materials, the raw materials were analyzed using X- ray diffraction equipment as first step, secondly for the purpose of studying the phase formation, the effect of forsterite as an additive on hydroxyapatite formation, as well as some physical properties (density, open porosity and thermal expansion coefficient), several equivalent powders of hysdroxyapatite (HA) – Forsterite (F) (xHAyF, y=100-x) were prepared, where we followed in situ crystallization transformation by Differential scanning calorimetry (DSC) analysis for hydroxyapatite and forsterite powder and pointing the temperature of each phase formation, tracking phase formation using X-ray powder diffraction (XRD) on the prepared powders as function of temperature (1200 °C, 1300 °C and 1400°C) to characterize the crystalline phases of hydroxyapatite and xHAyF compound. Dilatometry (DL) analysis were used to determine the effect of forsterite as addative on the sintring process in xHAyF compound.
Citation
KHADIDJA Laziri , ,(2023-12-02), Thermal analysis of Hydroxyapatite-Forsterite coumpond synthesized via bovine bone and nano-oxides powders,The 1st National Conference on Physics and it's Applications,NCPA ENS BOUSAADA
- 2023-03-10
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2023-03-10
Dense, Hard, and Thermally Stable Al6Si2O13–Mg2Al4Si5O18 Composite Material for Silicon Substrate Applications
One of the key problems to overcome, in the development of electronic substrates, is that of thermal distortion because of thermal mismatch between silicon and the substrate. The aim of this work is to design a mullite-cordierite composite material, with coefcient of thermal expansion tailored to silicon substrate applications. Dense, hard, and thermally stable Al6Si2O13–Mg2Al4Si5O18 composite was produced by sintering amorphous precursor powder synthesized through the sol–gel method. Si(C2H5O)4, Al(NO3)3.9H2O, and Mg(NO3)2.6H2O were used, as source of SiO2, Al2O3, and MgO oxides, respectively, to prepare mullite-cordierite precursor powders. Fourier-Transform Infrared spectroscopy (FTIR), Thermogravimetry (TG), Dilatometry, Diferential Thermal Analysis (DTA), and X-ray powder Difraction (XRD) methods were used to characterize the synthesized amorphous powder and its crystallization. The microstructure of specimens sintered at 1600 °C for 1 h was analyzed using a scanning electron microscope (SEM). The hardness (HV) and coefcient of thermal expansion (CTE) of the composite sintered at 1600 °C were measured by using a hardness tester and a dilatometer, respectively. The results show the increase in density and decrease in open porosity with the increase in temperature and equivalent amount of cordierite. For specimens sintered at 1600 °C, the increase in cordierite content from 0 to 40 wt.% increased the HV from 9.18 to 13.08 GPa; a further increase to 50 wt.% decreased it to 11.15 GPa. Sample containing 40 wt.% cordierite had the highest value of hardness (HV=13.08 GPa), representing an increase of 42.48% with respect to monolithic mullite. The CTE of the composites (in the range 50–1000 °C) showed continuous decrease from 5.23× 10–6 to 2.26× 10–6 K−1 with the increase in cordierite content from 0 to 50%. Sample containing 50 wt.% cordierite displayed the lowest thermal expansion (CTE of 2.26× 10−6 K−1), representing a decrease of 56.78% with respect to monolithic mullite.
Citation
Ahcen Keziz , MENAD Heraiz , Foudil SAHNOUNE , KHADIDJA Laziri , Redaoui El Djida, Saheb Nouari, , (2023-03-10), Dense, Hard, and Thermally Stable Al6Si2O13–Mg2Al4Si5O18 Composite Material for Silicon Substrate Applications, Silicon, Vol:15, Issue:4, pages:12, springer
- 2022-12-13
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2022-12-13
Effect of MgO on Phase Transformations and Kinetic Parameters In Cordierite Ceramics Synthesized from Nano-powder
The main of this present work is to synthesize cordierite (2MgO.2Al2O3.5SiO2) compound using nanomaterials oxides as starting material, and to study the effect of adding magnesium oxide (Mgo) on the crystallization mechanism and factors of this compound, as well as some of its properties. For this purpose, we prepared several equivalent powders to prepare several compounds of cordierite (C) - magnesium oxide (M) (Cx.My, y=100-x), where we followed in situ crystallization transformation by Differential scanning calorimetry (DSC) analysis and dilatometry (DL) analysis. The X-ray powder diffraction (XRD) were used on the prepared powders as function of temperature to characterize the crystalline phases. The crystallization kinetic parameters (the activation energy, the pre-exponential factor, and the reaction model) of cordierite (2MgO2Al2O35SiO2) and enstatite ceramics (MgSiO3) prepared from Nano-powder oxides by solid-state reactions, was studied using differential scanning calorimetry results. Apparent activation energies of crystallization of MgSiO3 changes from 748 to 644 kJ mol−1 when the concentration of magnesium oxide changes from 00 to 8 % Wt., and frome cordierite (2MgO2Al2O35SiO2) changes from 950 to 700 kJ.mol−1. the empirical Sestak-Berggren (SB) model was found to be acceptable for analyzing the kinetics of crystallization for the studied cordierite and magnesium silicate composition. The DTA-derived growth morphology parameters n and m are both close to 2, indicating that bulk nucleation with a constant number of nuclei dominates in cordierite crystallization.
Citation
KHADIDJA Laziri , ,(2022-12-13), Effect of MgO on Phase Transformations and Kinetic Parameters In Cordierite Ceramics Synthesized from Nano-powder,1st International Conference on Materials Sciences and Technology (MatScience-2022)),Abbes Laghrour University, Khenchela
- 2022-06-28
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2022-06-28
Preparation and characterization of forsterite (Mg2SiO4) from SiO2 and MgO nanopowders
The present work main focus is the preparation and characterization of forsterite (Mg2SiO4) bioceramics from SiO2 and MgO nanopowders. The used raw materials powders (initial powders) were mixed, ball milled and sintered within the temperature range of 1100–15000 °C for 2 h. Thermogravimetry (TG), differential thermal analysis (DTA), dilatometry, x-ray powder diffraction (XRD), and scanning electron microscopy (SEM) complementary techniques were used to analyze the sintering behavior and The formed phase during the thermal process. The specimens heat-treated in both the dilatometer and furnace, were characterized using x-ray powder diffraction (XRD) method. Pure nano-oxide powders used to produce forsterite bioceramics that started to form in the heat-treated specimens by furnace at 900 °C and completed its formation at 1400 °C.
Citation
KHADIDJA Laziri , ,(2022-06-28), Preparation and characterization of forsterite (Mg2SiO4) from SiO2 and MgO nanopowders,1st National Conference on Materials Sciences and Engineering (MSE'22)),Abbes Laghrour University, Khenchela
- 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
- 2022-03-14
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2022-03-14
Characterization of Cordierite/Mullite Composites Prepared By sol-gel Technique
The mullite-cordeirite composites were synthesis using raw materials including magnesium nitrate hexahydrate powder Mg(NO3)2.6H2O, aluminium nitrate nonahydrate Al(NO3)3•9H2O powder and tetraethyl orthosilicate TEOS (Si(OCH₂CH₃)₄) solution and by following Sol-Gel method of preparing according to the stoichiometric formula for the composites. We used several analyzes including Thermogravimetric, Differential Thermal Analysis (TG/DSC),Dilatometry analysis to study the phases transformation, also X-ray diffraction analysis (DRX) to identify the formed phases of M50C50 and confirm the previous analysis, which is cordierite and Mullite, infrared technique (FTIR) were used to track the stages of phase transformation for M50C50 powder treated by DSC at different temperatures. Based on DSC analysis results the activation energy and Avrami parameters of the Al-Si spinal phase, following the isothermal treatment and non-isothermal treatment found to be 595.64 and 605.86 kj/mol respectively, the morphological growth parameters n and m are about 1.5 indicating the dominant crystallization volume mode in spinal phase formation followed by three dimensional growth of spinal crystals with a polyhedral-like shape controlled by diffusion from fixed number of nuclei.
Citation
KHADIDJA Laziri , ,(2022-03-14), Characterization of Cordierite/Mullite Composites Prepared By sol-gel Technique,The first national Seminar on Green Chemistry and Natural Products (GCNP'22),University of Echahid Hamma Lakhdar, El-Oued
- 2022-02-07
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2022-02-07
Crystallization kinetics and characterization of forsterite (Mg2SiO4) bioceramics Synthesized from Nano-powder oxides
The main aim of this work is to synthesize Forsterite (Mg2SiO4) compound using nanomaterials oxides as starting raw material, study the effect of adding magnesium silicate (MgSiO3) on the crystallization mechanism and factors, also some properties of this compound. In order to achieve that, we synthesized several equivalent powders to prepare various compounds of Forsterite - Magnesium silicate (xF-(100-x)MS), followed the crystallization of phase transformation by Differential scanning calorimetry (DSC) analysis and Dilatometry (DL) analysis. The X-ray diffraction (XRD) analysis were used on the prepared powders to identify the crystalized phase. The crystallization kinetic parameters (the activation energy, the pre-exponential factor, and the reaction model) of Forsterite (Mg2SiO4) and magnesium silicate (MgSiO3) bioceramics prepared from Nano-powder oxides by solid-state reactions, were studied using Differential scanning calorimetry results. Apparent activation energies of crystallization 727 and 761 kJ mol−1 were obtained from Forsterite and magnesium silicate calculations based on the Arrhenius equation analysis. The empirical Sestak-Berggren (SB) model was found to be acceptable for analyzing the kinetics of crystallization for the studied Forsterite and magnesium silicate composition. The measurement results and calculated crystallization parameters (n=1.5, m=0.3) for the two compounds showed that the crystallization process includes a constant rate of nucleation and three-dimensional growth of nuclei, The determined average value of frequency factor is 5.8 and 6.3*1034 s-1 for Mg2SiO4 and MgSiO3 respectively.
Citation
KHADIDJA Laziri , ,(2022-02-07), Crystallization kinetics and characterization of forsterite (Mg2SiO4) bioceramics Synthesized from Nano-powder oxides,THE FIRST INTERNATIONAL SEMINAR ON MATERIALS SYNTHESIS AND ENVIROMENTAL MONITORING,University of Kasdi-Merbah Ouargla
- 2021-09-18
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2021-09-18
Crystallization kinetics and characterization of forsterite (Mg2SiO4) bioceramics Synthesized from Nano-powder oxides
The main aim of this work is to synthesize Forsterite (Mg2SiO4) compound using nanomaterials oxides as starting raw material, study the effect of adding magnesium silicate (MgSiO3) on the crystallization mechanism and factors, also some properties of this compound. In order to achieve that, we synthesized several equivalent powders to prepare various compounds of Forsterite - Magnesium silicate (xF-(100-x)MS), followed the crystallization of phase transformation by Differential scanning calorimetry (DSC) analysis and Dilatometry (DL) analysis. The X-ray diffraction (XRD) analysis were used on the prepared powders to identify the crystalized phase. The crystallization kinetic parameters (the activation energy, the pre-exponential factor, and the reaction model) of Forsterite (Mg2SiO4) and magnesium silicate (MgSiO3) bioceramics prepared from Nano-powder oxides by solid-state reactions, were studied using Differential scanning calorimetry results. Apparent activation energies of crystallization 727 and 761 kJ mol−1 were obtained from Forsterite and magnesium silicate calculations based on the Arrhenius equation analysis. The empirical Sestak-Berggren (SB) model was found to be acceptable for analyzing the kinetics of crystallization for the studied Forsterite and magnesium silicate composition. The measurement results and calculated crystallization parameters (n=1.5, m=0.3) for the two compounds showed that the crystallization process includes a constant rate of nucleation and three-dimensional growth of nuclei, The determined average value of frequency factor is 5.8 and 6.3*1034 s-1 for Mg2SiO4 and MgSiO3 respectively.
Citation
KHADIDJA Laziri , ,(2021-09-18), Crystallization kinetics and characterization of forsterite (Mg2SiO4) bioceramics Synthesized from Nano-powder oxides,SEMINAIRE INTERNATIONAL SUR LES SCIENCES DE LA MATIERE (PHYSIQUE ET CHIMIE),Université USTO, Bir El Djir, Oran, 31000, Algeria