Pub Date : 2024-06-06DOI: 10.15251/jor.2024.203.357
H. Q. Zhao, L. Li, Q. S. Yuan
Rice grain-shaped high Mn-doped anatase TiO2(TMO) nanocrystals have been fabricated through redox method at room temperature using several simple chemical reagents. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM), transmission electron microscopy and High-resolution transmission electron microscopy (TEM & HRTEM). It indicates that the manganese element was successfully incorporated into the anatase TiO2 nanostructure, and the atomic Mn-to-Ti could reach up to 18.2%. We also analyzed the merits and weaknesses of the nanostructured TMO in electrochemistry by dint of some relevant measures. And the cause of influence on the TMO electrochemical properties was briefly discussed.
{"title":"Electrochemical performance of rice grains like high Mn-doped anatase TiO2 nanoparticles as lithium-ion batteries electrode material","authors":"H. Q. Zhao, L. Li, Q. S. Yuan","doi":"10.15251/jor.2024.203.357","DOIUrl":"https://doi.org/10.15251/jor.2024.203.357","url":null,"abstract":"Rice grain-shaped high Mn-doped anatase TiO2(TMO) nanocrystals have been fabricated through redox method at room temperature using several simple chemical reagents. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM), transmission electron microscopy and High-resolution transmission electron microscopy (TEM & HRTEM). It indicates that the manganese element was successfully incorporated into the anatase TiO2 nanostructure, and the atomic Mn-to-Ti could reach up to 18.2%. We also analyzed the merits and weaknesses of the nanostructured TMO in electrochemistry by dint of some relevant measures. And the cause of influence on the TMO electrochemical properties was briefly discussed.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"77 S338","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141377519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-06DOI: 10.15251/jor.2024.203.345
S. Panda, C. S. Dash, R. Jothiramalingam, H. Al-Lohedan
The creation and optimisation of memristor models with different topologies and physical mechanisms have received increasing attention in recent years. Memristors, known for their unique resistive switching mechanism, have garnered significant interest as promising components for next-generation computing. However, to effectively design and test memristor-based circuits, it is crucial to have a mathematical representation of the experimentally determined current-voltage characteristics of memristors. This paper proposes a model and conducts an analysis that offers insights into memristor technology, beginning with its characteristics and extending to simulations involving various parameters. The proposed model and its dependency on temperature are implemented using MATLAB. The model captures changes in current characteristics concerning the fundamental voltage without using any window functions. Thus, it accurately represents the variation in memristance with temperature, contributing to a more precise and observed modelling approach.
{"title":"Modified nonlinear ion drift model for TiO2 memristor: a temperature dependent study","authors":"S. Panda, C. S. Dash, R. Jothiramalingam, H. Al-Lohedan","doi":"10.15251/jor.2024.203.345","DOIUrl":"https://doi.org/10.15251/jor.2024.203.345","url":null,"abstract":"The creation and optimisation of memristor models with different topologies and physical mechanisms have received increasing attention in recent years. Memristors, known for their unique resistive switching mechanism, have garnered significant interest as promising components for next-generation computing. However, to effectively design and test memristor-based circuits, it is crucial to have a mathematical representation of the experimentally determined current-voltage characteristics of memristors. This paper proposes a model and conducts an analysis that offers insights into memristor technology, beginning with its characteristics and extending to simulations involving various parameters. The proposed model and its dependency on temperature are implemented using MATLAB. The model captures changes in current characteristics concerning the fundamental voltage without using any window functions. Thus, it accurately represents the variation in memristance with temperature, contributing to a more precise and observed modelling approach.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"50 s174","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141376553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-15DOI: 10.15251/jor.2024.203.333
N. Ahmad Noor, F. Nasrullah, H. Elansary, S. Mumtaz
Recently, double perovskite halides (DPHs) become crucial due to their potential applications in optoelectronic devices due to their stability, non-toxicity, superior oxidation resistance, high conversion efficiency, and high temperature stability. In the current study, we explored DPHs Li2CuInY6 (Y = Cl, Br, I) employing Wien2k package to analyze the structural stability, optoelectronic and thermoelectric features. The formation energy and Born stability criteria are computed to confirm thermodynamic and structural stability. Studied DPHs have direct bandgaps nature investigated by modified Becke and Johnson (mBJ) potential. Calculated values of bandgap decreases, when replace halide ion from Cl to I, indicate tuning from visible to infrared (IR) region of electromagnetic spectrum. Their band edge tuning across the visible to infrared border is reliant on replacement, which makes them suitable for projects involving opto-electronic devices. Further, optical features are investigated in terms of incident photon energy in order to assess the optical output. Lastly, electronic thermoelectric performance is computed using the figure of merit (ZT) for all DPs. Computed results of direct bandgap and optical behavior show that DP Li2CuInCl6 can be used as photovoltaic devices as compared to DPs Li2CuInBr6 and Li2CuInI6.
{"title":"Probing optoelectronic and thermoelectric properties of double perovskite halides Li2CuInY6 (Y = Cl, Br, I) for energy conversion applications","authors":"N. Ahmad Noor, F. Nasrullah, H. Elansary, S. Mumtaz","doi":"10.15251/jor.2024.203.333","DOIUrl":"https://doi.org/10.15251/jor.2024.203.333","url":null,"abstract":"Recently, double perovskite halides (DPHs) become crucial due to their potential applications in optoelectronic devices due to their stability, non-toxicity, superior oxidation resistance, high conversion efficiency, and high temperature stability. In the current study, we explored DPHs Li2CuInY6 (Y = Cl, Br, I) employing Wien2k package to analyze the structural stability, optoelectronic and thermoelectric features. The formation energy and Born stability criteria are computed to confirm thermodynamic and structural stability. Studied DPHs have direct bandgaps nature investigated by modified Becke and Johnson (mBJ) potential. Calculated values of bandgap decreases, when replace halide ion from Cl to I, indicate tuning from visible to infrared (IR) region of electromagnetic spectrum. Their band edge tuning across the visible to infrared border is reliant on replacement, which makes them suitable for projects involving opto-electronic devices. Further, optical features are investigated in terms of incident photon energy in order to assess the optical output. Lastly, electronic thermoelectric performance is computed using the figure of merit (ZT) for all DPs. Computed results of direct bandgap and optical behavior show that DP Li2CuInCl6 can be used as photovoltaic devices as compared to DPs Li2CuInBr6 and Li2CuInI6.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" December","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141127911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-15DOI: 10.15251/jor.2024.203.309
A. Khamis, N. I. M. Rodzi, N. Z. A. Naharuddin
CIGS has shown significant potential for cost-effective and efficient photovoltaic applications, with efficiency often exceeding 20%. However, further improvements in cell performance are needed to reduce production costs. Thus, this study proposes an ultra-thin structure for CIGS solar cells by modifying the absorber layer thickness and composition. SCAPS software was used to evaluate the performance of the proposed design, such as open-circuit voltage (Voc), short-circuit current (Jsc), fill factor (FF%), and conversion efficiency (ŋ%). Results showed that ultra-thin solar cells with the proposed GnP and CGS absorber layers are ideal due to their greater ŋ%, 25.33%.
{"title":"Absorber layer improvement and performance analysis of CIGS thin-film solar cell","authors":"A. Khamis, N. I. M. Rodzi, N. Z. A. Naharuddin","doi":"10.15251/jor.2024.203.309","DOIUrl":"https://doi.org/10.15251/jor.2024.203.309","url":null,"abstract":"CIGS has shown significant potential for cost-effective and efficient photovoltaic applications, with efficiency often exceeding 20%. However, further improvements in cell performance are needed to reduce production costs. Thus, this study proposes an ultra-thin structure for CIGS solar cells by modifying the absorber layer thickness and composition. SCAPS software was used to evaluate the performance of the proposed design, such as open-circuit voltage (Voc), short-circuit current (Jsc), fill factor (FF%), and conversion efficiency (ŋ%). Results showed that ultra-thin solar cells with the proposed GnP and CGS absorber layers are ideal due to their greater ŋ%, 25.33%.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" 4","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141128191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-15DOI: 10.15251/jor.2024.203.325
P. D. H. B. Santhi, R. S. Samuel, R. Raja, A. M. Hidayathullah, S. Janarthanan, P. Suresh
The nonlinear optical material L-Tryptophanium phosphite (LTP) was synthesised and grown by the process of slow evaporation solution growth. Characterisations like single crystal XRD, FT-IR, and H1 NMR spectral measurements were done to find the crystal structure and functional groups. The crystal was found to possess good transparency for the whole visible region from the UV-Vis-NIR spectral analysis. The thermal behaviour like stability and breakdown of the crystal were assessed using TG-DTA analyses. The hardness of the crystal was determined using Vickers micro hardness study. The KurtzPerry approach was used to study the nonlinear optical (NLO) characteristics of the crystal. A good value of conversion efficiency in second harmonic generation (SHG) makes the generated crystal suitable for frequency conversion.
{"title":"Investigations on synthesis, growth and characterisations of a NLO material: L-Tryptophanium phosphite (LTP)","authors":"P. D. H. B. Santhi, R. S. Samuel, R. Raja, A. M. Hidayathullah, S. Janarthanan, P. Suresh","doi":"10.15251/jor.2024.203.325","DOIUrl":"https://doi.org/10.15251/jor.2024.203.325","url":null,"abstract":"The nonlinear optical material L-Tryptophanium phosphite (LTP) was synthesised and grown by the process of slow evaporation solution growth. Characterisations like single crystal XRD, FT-IR, and H1 NMR spectral measurements were done to find the crystal structure and functional groups. The crystal was found to possess good transparency for the whole visible region from the UV-Vis-NIR spectral analysis. The thermal behaviour like stability and breakdown of the crystal were assessed using TG-DTA analyses. The hardness of the crystal was determined using Vickers micro hardness study. The KurtzPerry approach was used to study the nonlinear optical (NLO) characteristics of the crystal. A good value of conversion efficiency in second harmonic generation (SHG) makes the generated crystal suitable for frequency conversion.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":" 6","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141128245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.15251/jor.2024.201.115
R. Jagadeeswari, G. Rathika, K. V. Satheesh Kumar, P. Selvakumar
Zinc oxide nanoparticles were chemically synthesised and characterised by UV-DRS spectroscopy, FTIR, scanning electron microscopy with energy-dispersive X-ray diffraction, and X-ray powder diffraction. In order to evaluate the impact of the synthesis process on the structural parameters, Rietveld refinement was done using the GSAS-II programme on experimentally acquired XRD data. ZnO was found to have a hexagonal structure with lattice parameters of a = b =3.247 Å; c = 5.205Å and an average size of about 20-40 nm, as determined by Rietveld refinement of XRD and SEM data. FTIR and EDX analysis was used to confirm the functional group and elemental composition of ZnO NPs. The UV-DRS spectra revealed that the synthesised ZnO had an optical band gap of 3.05 eV. Parametric investigations of the surface morphology of ZnO nanostructures were conducted using the Gwyddion programme. Pseudo-first-order rate kinetics were observed for the photodegradation of two cationic dyes, MB (87.87%) and RhB (74.79%), in the presence of UV light.
氧化锌纳米粒子是用化学方法合成的，并通过紫外-可见分光光度法、傅立叶变换红外光谱法、扫描电子显微镜与能量色散 X 射线衍射法和 X 射线粉末衍射法进行了表征。为了评估合成过程对结构参数的影响，使用 GSAS-II 程序对实验获得的 XRD 数据进行了里特维尔德细化。通过对 XRD 和 SEM 数据进行里特维尔德细化，发现氧化锌具有六边形结构，其晶格参数为 a = b =3.247 Å；c = 5.205 Å，平均尺寸约为 20-40 nm。傅立叶变换红外光谱（FTIR）和电离辐射分析（EDX）用于确认氧化锌纳米粒子的官能团和元素组成。UV-DRS 光谱显示，合成的氧化锌具有 3.05 eV 的光带隙。使用 Gwyddion 程序对氧化锌纳米结构的表面形态进行了参数研究。在紫外光的作用下，观察到了两种阳离子染料 MB（87.87%）和 RhB（74.79%）的光降解伪一阶速率动力学。
{"title":"Surface parametric influences on the photocatalytic behaviour of zinc oxide nanoparticles","authors":"R. Jagadeeswari, G. Rathika, K. V. Satheesh Kumar, P. Selvakumar","doi":"10.15251/jor.2024.201.115","DOIUrl":"https://doi.org/10.15251/jor.2024.201.115","url":null,"abstract":"Zinc oxide nanoparticles were chemically synthesised and characterised by UV-DRS spectroscopy, FTIR, scanning electron microscopy with energy-dispersive X-ray diffraction, and X-ray powder diffraction. In order to evaluate the impact of the synthesis process on the structural parameters, Rietveld refinement was done using the GSAS-II programme on experimentally acquired XRD data. ZnO was found to have a hexagonal structure with lattice parameters of a = b =3.247 Å; c = 5.205Å and an average size of about 20-40 nm, as determined by Rietveld refinement of XRD and SEM data. FTIR and EDX analysis was used to confirm the functional group and elemental composition of ZnO NPs. The UV-DRS spectra revealed that the synthesised ZnO had an optical band gap of 3.05 eV. Parametric investigations of the surface morphology of ZnO nanostructures were conducted using the Gwyddion programme. Pseudo-first-order rate kinetics were observed for the photodegradation of two cationic dyes, MB (87.87%) and RhB (74.79%), in the presence of UV light.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"15 9","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140269120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.15251/jor.2024.202.155
N. Thiruveni, R. Mathammal
This paper reports the first-time synthesis of Sr0.99Zr(PO4)2:0.01Eu3+ nanophosphor via solution combustion method using glycine as fuel at a fuel-to-oxidizer ratio of 1:1. The PXRD pattern confirmed the formation of the desired phase, while the Scherrer calculation revealed an average particle size of approximately 60 nm. Scanning electron microscopy (SEM) further corroborated the particle size, estimating it around 75 nm. The material exhibited a characteristic mesoporous structure, a hallmark of the solution combustion synthesis technique. Photoluminescence (PL) spectroscopy revealed two intense emission peaks at 590 nm and 615 nm, attributed to Eu3+ ions, suggesting potential applications in LED technology. CIE coordinates indicated emission close to the white region defined by the NTSC standard
{"title":"Sr0.99Zr(PO4)2:0.01Eu3+ ceramic glass for photoluminescence applications","authors":"N. Thiruveni, R. Mathammal","doi":"10.15251/jor.2024.202.155","DOIUrl":"https://doi.org/10.15251/jor.2024.202.155","url":null,"abstract":"This paper reports the first-time synthesis of Sr0.99Zr(PO4)2:0.01Eu3+ nanophosphor via solution combustion method using glycine as fuel at a fuel-to-oxidizer ratio of 1:1. The PXRD pattern confirmed the formation of the desired phase, while the Scherrer calculation revealed an average particle size of approximately 60 nm. Scanning electron microscopy (SEM) further corroborated the particle size, estimating it around 75 nm. The material exhibited a characteristic mesoporous structure, a hallmark of the solution combustion synthesis technique. Photoluminescence (PL) spectroscopy revealed two intense emission peaks at 590 nm and 615 nm, attributed to Eu3+ ions, suggesting potential applications in LED technology. CIE coordinates indicated emission close to the white region defined by the NTSC standard","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"117 ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140272356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.15251/jor.2024.202.125
Ch. Sianglam, L. R. Singh, B. Thangjam
Co substituted Ni-Cu-Zn nanoferrites with the compositional formula Cox Ni0.5−x Cu0.3 Zn0.2 Fe2O4 (where x=0.0, 0.1, 0.2) were synthesized by Citrate Precursor method. The as prepared samples were calcined at 950o C for 30 min using a conventional muffle furnace. Characterizations were carried out using XRD, FESEM and VSM techniques.XRD peaks conform to spinel type structure. FESEM micrographs showed surface morphology. Magnetic characterizations were carried out by employing VSM technique. This paper investigates the synthesized samples as potential electronic materials for Multilayer Chip Inductor (MLCI).
{"title":"Structural and magnetic characterizations of Co substituted Ni-Cu-Zn nanoferrites","authors":"Ch. Sianglam, L. R. Singh, B. Thangjam","doi":"10.15251/jor.2024.202.125","DOIUrl":"https://doi.org/10.15251/jor.2024.202.125","url":null,"abstract":"Co substituted Ni-Cu-Zn nanoferrites with the compositional formula Cox Ni0.5−x Cu0.3 Zn0.2 Fe2O4 (where x=0.0, 0.1, 0.2) were synthesized by Citrate Precursor method. The as prepared samples were calcined at 950o C for 30 min using a conventional muffle furnace. Characterizations were carried out using XRD, FESEM and VSM techniques.XRD peaks conform to spinel type structure. FESEM micrographs showed surface morphology. Magnetic characterizations were carried out by employing VSM technique. This paper investigates the synthesized samples as potential electronic materials for Multilayer Chip Inductor (MLCI).","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"66 23","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140280816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.15251/jor.2024.202.131
A. A. Abdul Razaq, F. H. Jasim, S. S. Chiad, F. A. Jasim, Z. S. A. Mosa, Y. H. Kadhim
This study uses glass substrates to create nanostructured TiO2 thin films employing SolGel method. Afterwards, TiO2 films are annealed in air for two hours at (400, 450, and 500) °C. The XRD tests demonstrate that all films are tetragonal polycrystalline and have orientations equal to those described in the literature. These findings suggest that when the annealing temperature rises, grain size increases. As the annealing temperature is raised, the Full Width at Half Maximum (FWHM) reduces from 0.57° to 0.0.51°, and the dislocation density drops from 45.22 to 39.22.18 nm, respectively. AFM has examined the thin films' surface morphology. The films formed using this method have good crystalline and homogenous surfaces, according to AFM tests. With an increase in annealing temperature, thin films' average particle size, average roughness, and Root Mean Square (RMS) value all drop. The films' optical characteristics. The transmission was over 97% decreased with increasing annealing temperatures. It is found that the band gap decreases from 3.42 to 3.3 eV with increasing annealing temperature. Between 300 and 900 nm, the films' refractive indices range from 2.89 to 2.2.76. With higher annealing temperatures, the films' extinction coefficients fall.
{"title":"Effect of annealing temperature on the physical of nanostructured TiO2 films prepared by sol-gel method","authors":"A. A. Abdul Razaq, F. H. Jasim, S. S. Chiad, F. A. Jasim, Z. S. A. Mosa, Y. H. Kadhim","doi":"10.15251/jor.2024.202.131","DOIUrl":"https://doi.org/10.15251/jor.2024.202.131","url":null,"abstract":"This study uses glass substrates to create nanostructured TiO2 thin films employing SolGel method. Afterwards, TiO2 films are annealed in air for two hours at (400, 450, and 500) °C. The XRD tests demonstrate that all films are tetragonal polycrystalline and have orientations equal to those described in the literature. These findings suggest that when the annealing temperature rises, grain size increases. As the annealing temperature is raised, the Full Width at Half Maximum (FWHM) reduces from 0.57° to 0.0.51°, and the dislocation density drops from 45.22 to 39.22.18 nm, respectively. AFM has examined the thin films' surface morphology. The films formed using this method have good crystalline and homogenous surfaces, according to AFM tests. With an increase in annealing temperature, thin films' average particle size, average roughness, and Root Mean Square (RMS) value all drop. The films' optical characteristics. The transmission was over 97% decreased with increasing annealing temperatures. It is found that the band gap decreases from 3.42 to 3.3 eV with increasing annealing temperature. Between 300 and 900 nm, the films' refractive indices range from 2.89 to 2.2.76. With higher annealing temperatures, the films' extinction coefficients fall.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"202 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140270888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.15251/jor.2024.202.143
S. Yuvaraj, P. Aji Udhaya, S. Deepa, M. Sundararajan, R. Jothiramalingam, H. Al-Lohedan, H. Al-Sigh, A. A. Nazeer
La2CuO4 perovskite nanoparticles doped with aluminum were synthesized through the microwave-assisted combustion technique. Comprehensive studies on the structural, magnetic optical, functional and morphological properties were conducted using various techniques, including XRD, EDX, VSM, DRS-UV, FT-IR and FESEM respectively, .The XRD patterns of pristine La2CuO4 and Al-doped La2CuO4 unequivocally validated the exclusive development of a perovskite structure, devoid of any impurities. Nevertheless, the augmentation in Al3+ content (x = 0–0.25) induced a noteworthy phase shift from orthorhombic to cubic configuration. The average crystallite dimensions spanned from 54 to 41 nm. Distinct FT-IR bands at approximately 687 and 434 cm-1 were intricately linked to the La-O and Cu-O stretching modes inherent to the orthorhombic La2CuO4 phase. The energy gap determined through the Kubelka–Munk (K–M) methodology, experienced an elevation concomitant with the heightened Al3+ content (1.67–1.72 eV), attributable to quantum confinement phenomena. Within the La2-xAlxCuO4 (x = 0 to 0.25) system, the genesis of nanoscaled crystallized grains, interspersed with pores resulting from the amalgamation of grains, was evident. Analysis of hysteresis curves unveiled the emergence of soft ferromagnetic behavior at ambient temperature.
{"title":"Synthesis and Exploring structural, magnetic, morphology and optical properties of La2−xAlxCuO4 (0 ≤ x ≤ 0.25) perovskite nanoparticles by microwave-assisted combustion method","authors":"S. Yuvaraj, P. Aji Udhaya, S. Deepa, M. Sundararajan, R. Jothiramalingam, H. Al-Lohedan, H. Al-Sigh, A. A. Nazeer","doi":"10.15251/jor.2024.202.143","DOIUrl":"https://doi.org/10.15251/jor.2024.202.143","url":null,"abstract":"La2CuO4 perovskite nanoparticles doped with aluminum were synthesized through the microwave-assisted combustion technique. Comprehensive studies on the structural, magnetic optical, functional and morphological properties were conducted using various techniques, including XRD, EDX, VSM, DRS-UV, FT-IR and FESEM respectively, .The XRD patterns of pristine La2CuO4 and Al-doped La2CuO4 unequivocally validated the exclusive development of a perovskite structure, devoid of any impurities. Nevertheless, the augmentation in Al3+ content (x = 0–0.25) induced a noteworthy phase shift from orthorhombic to cubic configuration. The average crystallite dimensions spanned from 54 to 41 nm. Distinct FT-IR bands at approximately 687 and 434 cm-1 were intricately linked to the La-O and Cu-O stretching modes inherent to the orthorhombic La2CuO4 phase. The energy gap determined through the Kubelka–Munk (K–M) methodology, experienced an elevation concomitant with the heightened Al3+ content (1.67–1.72 eV), attributable to quantum confinement phenomena. Within the La2-xAlxCuO4 (x = 0 to 0.25) system, the genesis of nanoscaled crystallized grains, interspersed with pores resulting from the amalgamation of grains, was evident. Analysis of hysteresis curves unveiled the emergence of soft ferromagnetic behavior at ambient temperature.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"165 ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140274554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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