Pub Date : 2023-04-03DOI: 10.1080/0371750X.2023.2175040
Ashwini Devidas, T. Sankarappa, Amarkumar Malge, Mohansingh Heerasingh
A set of glasses of composition (ZnO)0.3-(V2O5)0.6–x-(B2O3)0.1-(Na2O)x with x = 0.1, 0.15, 0.2 and 0.3 were prepared and their non-crystallinity were confirmed. Density and molar volume were found to decrease with increasing Na2O concentration. Using Phy-X/PSD and XCOM softwares, radiation-shielding efficiency was determined by estimating mass attenuation coefficient, linear attenuation coefficient, effective atomic number, half value layer, tenth value layer and mean free path of glasses for gamma energy from 0.005 to 15 MeV. Obtained shielding parameters led to propose the glasses for γ-ray shielding at lower energy regime. Conductivity variation with temperature was analyzed using Mott’s small polaron hopping model and activation energy was determined. It was found to decrease with increasing Na2O content both at high and low temperature. The density of states at Fermi level was determined using Mott’s and Greave’s variable range hopping (VRH) models at low temperature. GRAPHICAL ABSTRACT
{"title":"Gamma-ray Shielding Characteristics and Electrical Properties of Na2O Doped Zinc-Boro-Vanadate Glasses","authors":"Ashwini Devidas, T. Sankarappa, Amarkumar Malge, Mohansingh Heerasingh","doi":"10.1080/0371750X.2023.2175040","DOIUrl":"https://doi.org/10.1080/0371750X.2023.2175040","url":null,"abstract":"A set of glasses of composition (ZnO)0.3-(V2O5)0.6–x-(B2O3)0.1-(Na2O)x with x = 0.1, 0.15, 0.2 and 0.3 were prepared and their non-crystallinity were confirmed. Density and molar volume were found to decrease with increasing Na2O concentration. Using Phy-X/PSD and XCOM softwares, radiation-shielding efficiency was determined by estimating mass attenuation coefficient, linear attenuation coefficient, effective atomic number, half value layer, tenth value layer and mean free path of glasses for gamma energy from 0.005 to 15 MeV. Obtained shielding parameters led to propose the glasses for γ-ray shielding at lower energy regime. Conductivity variation with temperature was analyzed using Mott’s small polaron hopping model and activation energy was determined. It was found to decrease with increasing Na2O content both at high and low temperature. The density of states at Fermi level was determined using Mott’s and Greave’s variable range hopping (VRH) models at low temperature. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"82 1","pages":"97 - 104"},"PeriodicalIF":1.2,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45343582","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 : 2023-04-03DOI: 10.1080/0371750X.2023.2205601
Saliou Njuhou, M. Mouafon, A. Pountouenchi, O. R. Njindam, G. Lecomte‐Nana, D. Njoya
The optimization of properties of ceramic membrane by taking into account the correlation between their properties remains a challenge. The purpose of this study was to achieve this objective by using design of experiment to perform optimization of a ceramic membrane made from clays and rice husk. Two kaolinite clays, namely MY3 and KG, were used with rice husk to manufacture ceramic membranes. After sintering, the obtained products underwent characterizations such as flexural strength, open porosity, permeability, hydraulic diameter, XRD analysis and microscopy image analysis. The effects of each component on membrane properties were modelled with linear models. The results showed significant interactions between constituents and between membrane properties (porosity with resistance, permeability with porosity and hydraulic diameter). The optimal mixture consisted of 83% MY3, 15% KG and 2% rice husk which presented 8.0 MPa flexural strength, 30% porosity, 675 L.h–1.m–2.bar–1 permeability and 2.6 µm hydraulic diameter. Filtration of slaughterhouse wastewater showed a reduction of 97% chemical oxygen demand, 99% turbidity, 80% total dissolved solid, electrical conductivity and salinity. 84% pseudomonas and 75% vibrio cholerae were also eliminated. GRAPHICAL ABSTRACT
考虑到陶瓷膜性能之间的相关性来优化陶瓷膜的性能仍然是一个挑战。为了达到这一目的，本研究采用实验设计对粘土和稻壳制备的陶瓷膜进行了优化。用两种高岭石粘土MY3和KG与稻壳混合制备陶瓷膜。烧结后，对所得产品进行了抗弯强度、开孔率、渗透率、水力直径、XRD分析和显微图像分析等表征。用线性模型模拟了各组分对膜性能的影响。结果表明，各组分之间以及膜性能(孔隙度与阻力、渗透率与孔隙度和水力直径)之间存在显著的相互作用。最佳配比为:MY3 83%， KG 15%，稻壳2%，抗折强度8.0 MPa，孔隙率30%，675 l - h - 1 - m - 2。Bar-1渗透率和2.6µm水力直径。过滤后的屠宰场废水化学需氧量降低97%，浊度降低99%，总溶解固形物降低80%，电导率和盐度降低80%。84%的假单胞菌和75%的霍乱弧菌也被消灭。图形抽象
{"title":"Rice Husks and Kaolin Based Ceramic Membrane for Filtration of Slaughterhouse Wastewater: Optimization Study Using Response Surface Methodology (RSM) and Responses Interdependence Analysis","authors":"Saliou Njuhou, M. Mouafon, A. Pountouenchi, O. R. Njindam, G. Lecomte‐Nana, D. Njoya","doi":"10.1080/0371750X.2023.2205601","DOIUrl":"https://doi.org/10.1080/0371750X.2023.2205601","url":null,"abstract":"The optimization of properties of ceramic membrane by taking into account the correlation between their properties remains a challenge. The purpose of this study was to achieve this objective by using design of experiment to perform optimization of a ceramic membrane made from clays and rice husk. Two kaolinite clays, namely MY3 and KG, were used with rice husk to manufacture ceramic membranes. After sintering, the obtained products underwent characterizations such as flexural strength, open porosity, permeability, hydraulic diameter, XRD analysis and microscopy image analysis. The effects of each component on membrane properties were modelled with linear models. The results showed significant interactions between constituents and between membrane properties (porosity with resistance, permeability with porosity and hydraulic diameter). The optimal mixture consisted of 83% MY3, 15% KG and 2% rice husk which presented 8.0 MPa flexural strength, 30% porosity, 675 L.h–1.m–2.bar–1 permeability and 2.6 µm hydraulic diameter. Filtration of slaughterhouse wastewater showed a reduction of 97% chemical oxygen demand, 99% turbidity, 80% total dissolved solid, electrical conductivity and salinity. 84% pseudomonas and 75% vibrio cholerae were also eliminated. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"82 1","pages":"143 - 155"},"PeriodicalIF":1.2,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47964203","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 : 2023-04-03DOI: 10.1080/0371750X.2023.2189621
Zixu Ji, N. Liao, Ya-wei Li, Tianbin Zhu, M. Nath, Zhihua Yang
ZrB2-based composites are promising ultra-high temperature materials, nonetheless their poor damage tolerance and low oxidation resistance hinder their practical applications. In the present work, Zr1–xTixB2-20 vol% SiC composites were prepared based on the mechanical alloying (MA) method and spark plasma sintering (SPS) technique. The results showed that solid solution of ZrTiB4 can be obtained by taking nano-sized ZrB2-TiB2 powders from the MA process. The Zr7/8Ti1/8B2-20 vol% SiC composites presented higher fracture toughness due to various toughening mechanisms, such as ‘crack deflection’ and ‘pull out’ induced by the finer solid solution particles and nano-sized graphite. Consequently, Zr7/8Ti1/8B2-20 vol% SiC composites possessed a residual strength of 180 MPa after thermal shock test with a temperature difference of 1000°C, while the conventional ZrB2-20 vol% SiC composites only remained at 81.4 MPa. GRAPHICAL ABSTRACT
{"title":"Microstructure and Thermal Shock Resistance of Zr7/8Ti1/8B2-20 vol% SiC Composites Synthesized by Mechanical Alloying and Spark Plasma Sintering","authors":"Zixu Ji, N. Liao, Ya-wei Li, Tianbin Zhu, M. Nath, Zhihua Yang","doi":"10.1080/0371750X.2023.2189621","DOIUrl":"https://doi.org/10.1080/0371750X.2023.2189621","url":null,"abstract":"ZrB2-based composites are promising ultra-high temperature materials, nonetheless their poor damage tolerance and low oxidation resistance hinder their practical applications. In the present work, Zr1–xTixB2-20 vol% SiC composites were prepared based on the mechanical alloying (MA) method and spark plasma sintering (SPS) technique. The results showed that solid solution of ZrTiB4 can be obtained by taking nano-sized ZrB2-TiB2 powders from the MA process. The Zr7/8Ti1/8B2-20 vol% SiC composites presented higher fracture toughness due to various toughening mechanisms, such as ‘crack deflection’ and ‘pull out’ induced by the finer solid solution particles and nano-sized graphite. Consequently, Zr7/8Ti1/8B2-20 vol% SiC composites possessed a residual strength of 180 MPa after thermal shock test with a temperature difference of 1000°C, while the conventional ZrB2-20 vol% SiC composites only remained at 81.4 MPa. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"82 1","pages":"122 - 128"},"PeriodicalIF":1.2,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43315336","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}
Layered double hydroxide (LDH) (Mg-Al and Mg-Al-Co) films were prepared on the surface of LA103Z magnesium-lithium alloy by hydrothermal synthesis method. Corrosion resistance of binary and ternary LDH coatings was studied by comparison. Structures of the two films were characterized using XRD, FTIR, SEM and EDS, and the corrosion resistance of the films was evaluated by polarization curve, EIS, and hydrogen evolution rate during immersion in 3.5 wt% NaCl solution. Results showed that Mg-Al LDH film was tightly bonded to the substrate and had a large number of nanosheets growing perpendicular to the substrate, while Mg-Al-Co LDH film was thinner with a smaller size and fewer nanosheets. Electrochemical test results showed that the polarization resistance of Mg-Al and Mg-Al-Co LDH films was two orders of magnitude higher than that of the substrate. Hydrogen precipitation experiments showed that corrosion resistance of both the films was improved compared to the substrate, and the films played a protective role for the substrate, among which the corrosion resistance of the Mg-Al LDH layer was better than that of the Mg-Al-Co LDH layer. GRAPHICAL ABSTRACT
采用水热合成法在LA103Z镁锂合金表面制备了层状双氢氧化物(Mg-Al和Mg-Al- co)薄膜。通过对比研究了二元LDH涂层和三元LDH涂层的耐蚀性。采用XRD、FTIR、SEM和EDS对两种膜的结构进行了表征，并通过极化曲线、EIS和在3.5 wt% NaCl溶液中的析氢速率对两种膜的耐蚀性进行了评价。结果表明，Mg-Al LDH薄膜与衬底结合紧密，有大量纳米片垂直生长，而Mg-Al- co LDH薄膜更薄，尺寸更小，纳米片数量更少。电化学测试结果表明，Mg-Al和Mg-Al- co LDH薄膜的极化电阻比衬底高两个数量级。氢气析出实验表明，两种膜的耐蚀性均较基体有所提高，并对基体起到保护作用，其中Mg-Al LDH层的耐蚀性优于Mg-Al- co LDH层。图形抽象
{"title":"Comparative Study on Corrosion Resistance of Binary and Ternary Layered Double Hydroxide Films on Magnesium Lithium Alloy","authors":"Ju‐mei Zhang, Duo‐duo Lian, Mengchun Zhang, An‐rong Hou, Jia‐cheng Li, Teng Zhang","doi":"10.1080/0371750X.2023.2189624","DOIUrl":"https://doi.org/10.1080/0371750X.2023.2189624","url":null,"abstract":"Layered double hydroxide (LDH) (Mg-Al and Mg-Al-Co) films were prepared on the surface of LA103Z magnesium-lithium alloy by hydrothermal synthesis method. Corrosion resistance of binary and ternary LDH coatings was studied by comparison. Structures of the two films were characterized using XRD, FTIR, SEM and EDS, and the corrosion resistance of the films was evaluated by polarization curve, EIS, and hydrogen evolution rate during immersion in 3.5 wt% NaCl solution. Results showed that Mg-Al LDH film was tightly bonded to the substrate and had a large number of nanosheets growing perpendicular to the substrate, while Mg-Al-Co LDH film was thinner with a smaller size and fewer nanosheets. Electrochemical test results showed that the polarization resistance of Mg-Al and Mg-Al-Co LDH films was two orders of magnitude higher than that of the substrate. Hydrogen precipitation experiments showed that corrosion resistance of both the films was improved compared to the substrate, and the films played a protective role for the substrate, among which the corrosion resistance of the Mg-Al LDH layer was better than that of the Mg-Al-Co LDH layer. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"82 1","pages":"129 - 135"},"PeriodicalIF":1.2,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41568076","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}
The quick increasing of sol viscosity shortens the spinning holding time and is not helpful for the spinning procedure. How to postpone the rapid enhancement of sol viscosity has become an important issue. In this study, mullite fiber was prepared by sol-gel method using low molecular weight acid as modifying agent. The increase of sol viscosity became slow when the low molecular weight acid was mixed in spinning sol. TG/DSC analysis showed no peak corresponding to carboxylic acid group of modifying agents. It was concluded that the carboxylic acid group reacted with hydroxyl group and was absent in spinning sol. Fourier transform infrared analysis revealed that absorption peak concerning ester group was present. It implied that the esterification reaction was carried out between carboxylic group of low molecular weight acid and hydroxylic radical. The measurement of X-ray diffraction indicated that the mullization took place at 1100°C. The mullite fibers with smooth and dense surface were obtained ultimately. GRAPHICAL ABSTRACT
{"title":"Mullite Fiber Prepared by Sol-Gel Method Using Low-Molecular-Weight Acids as Modifying Agents","authors":"Yabin Zhang, Yingying Cui, Changfan Xiao, Lihua Wu","doi":"10.1080/0371750X.2023.2181221","DOIUrl":"https://doi.org/10.1080/0371750X.2023.2181221","url":null,"abstract":"The quick increasing of sol viscosity shortens the spinning holding time and is not helpful for the spinning procedure. How to postpone the rapid enhancement of sol viscosity has become an important issue. In this study, mullite fiber was prepared by sol-gel method using low molecular weight acid as modifying agent. The increase of sol viscosity became slow when the low molecular weight acid was mixed in spinning sol. TG/DSC analysis showed no peak corresponding to carboxylic acid group of modifying agents. It was concluded that the carboxylic acid group reacted with hydroxyl group and was absent in spinning sol. Fourier transform infrared analysis revealed that absorption peak concerning ester group was present. It implied that the esterification reaction was carried out between carboxylic group of low molecular weight acid and hydroxylic radical. The measurement of X-ray diffraction indicated that the mullization took place at 1100°C. The mullite fibers with smooth and dense surface were obtained ultimately. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"82 1","pages":"105 - 114"},"PeriodicalIF":1.2,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41729142","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 : 2023-04-03DOI: 10.1080/0371750X.2023.2186953
B. Baruah, Sidhanta Kumar Parija, R. Sarkar
Non-stoichiometric spinel compositions with molar ratio of MgO:Al2O3 = 1:2 and 2:1, were prepared via single-stage reaction sintering technique at 1550°-1600°C using commercial grade oxide reactants. The effect of different rare-earth oxides, viz. CeO2, La2O3 and Y2O3 at 2 wt% level on the properties of different spinel batches was studied. Y2O3 was found to favour densification in both the spinel batches while CeO2 and La2O3 were found to favour densification only in the MgO-rich spinel compositions. Phase analysis revealed that Y2O3 containing Al2O3-rich spinel has a secondary phase with similar crystal structure to spinel (both cubic) and improved densification, while in the MgO-rich condition, Y2O3 remained as secondary phase and assisted in densification. CeO2 and La2O3 in Al2O3-rich samples formed secondary phases with different crystal structures and resulted in reduced densification. While in MgO-rich condition, CeO2 (cubic) did not react with Al2O3 and La2O3 formed a secondary phase with similar crystal structure as that of spinel and therefore assisted in densification. Addition of rare-earth oxides led to improvement in strength of MgO-rich spinels and maximum improvement in strength was observed with the addition of yttria. GRAPHICAL ABSTRACT
{"title":"Effect of Rare-Earth Oxides on Reaction Sintered Non-Stoichiometric Magnesium Aluminate Spinel","authors":"B. Baruah, Sidhanta Kumar Parija, R. Sarkar","doi":"10.1080/0371750X.2023.2186953","DOIUrl":"https://doi.org/10.1080/0371750X.2023.2186953","url":null,"abstract":"Non-stoichiometric spinel compositions with molar ratio of MgO:Al2O3 = 1:2 and 2:1, were prepared via single-stage reaction sintering technique at 1550°-1600°C using commercial grade oxide reactants. The effect of different rare-earth oxides, viz. CeO2, La2O3 and Y2O3 at 2 wt% level on the properties of different spinel batches was studied. Y2O3 was found to favour densification in both the spinel batches while CeO2 and La2O3 were found to favour densification only in the MgO-rich spinel compositions. Phase analysis revealed that Y2O3 containing Al2O3-rich spinel has a secondary phase with similar crystal structure to spinel (both cubic) and improved densification, while in the MgO-rich condition, Y2O3 remained as secondary phase and assisted in densification. CeO2 and La2O3 in Al2O3-rich samples formed secondary phases with different crystal structures and resulted in reduced densification. While in MgO-rich condition, CeO2 (cubic) did not react with Al2O3 and La2O3 formed a secondary phase with similar crystal structure as that of spinel and therefore assisted in densification. Addition of rare-earth oxides led to improvement in strength of MgO-rich spinels and maximum improvement in strength was observed with the addition of yttria. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"82 1","pages":"115 - 121"},"PeriodicalIF":1.2,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43748052","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 : 2023-04-03DOI: 10.1080/0371750X.2023.2205600
Ş. Çavdar, Yesim Demirolmez, Neslihan Turan, H. Koralay, N. Tuğluoğlu
In this article, structural, morphological and electrical properties of ZnCo2O4 ceramics sample were studied. ZnCo2O4 nanoparticles were synthesized using sol-gel method. Structural and morphological properties of the sample were analyzed using X-ray diffraction and scanning electron microscope. Conductance, capacitance and impedance spectroscopy characterization of ZnCo2O4 ceramics sample were analyzed in 3 kHz-1.5 MHz frequency range and 300-500 K temperature range. Nyquist diagrams of impedance and the equivalent circuit were studied for ZnCo2O4 ceramics in the temperature range of 300-500 K. Cole-Cole curves of the impedance data were found to show a semicircular arc in both low and high temperature areas, which is expressed by the equivalent electrical circuit Rs (RgC g)(RgbQCgb ). Relaxation behavior was identified to be of non-Debye type. The Cole-Cole curve showed the negative temperature coefficient of resistance type behavior. Values of the activation energy corresponding to relaxation processes were found as 0.054 eV below 360 K and 0.561 eV above 360 K. GRAPHICAL ABSTRACT
{"title":"Impedance Spectroscopy Characterization of ZnCo2O4 Ceramics Obtained by the Sol-Gel Method","authors":"Ş. Çavdar, Yesim Demirolmez, Neslihan Turan, H. Koralay, N. Tuğluoğlu","doi":"10.1080/0371750X.2023.2205600","DOIUrl":"https://doi.org/10.1080/0371750X.2023.2205600","url":null,"abstract":"In this article, structural, morphological and electrical properties of ZnCo2O4 ceramics sample were studied. ZnCo2O4 nanoparticles were synthesized using sol-gel method. Structural and morphological properties of the sample were analyzed using X-ray diffraction and scanning electron microscope. Conductance, capacitance and impedance spectroscopy characterization of ZnCo2O4 ceramics sample were analyzed in 3 kHz-1.5 MHz frequency range and 300-500 K temperature range. Nyquist diagrams of impedance and the equivalent circuit were studied for ZnCo2O4 ceramics in the temperature range of 300-500 K. Cole-Cole curves of the impedance data were found to show a semicircular arc in both low and high temperature areas, which is expressed by the equivalent electrical circuit Rs (RgC g)(RgbQCgb ). Relaxation behavior was identified to be of non-Debye type. The Cole-Cole curve showed the negative temperature coefficient of resistance type behavior. Values of the activation energy corresponding to relaxation processes were found as 0.054 eV below 360 K and 0.561 eV above 360 K. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"82 1","pages":"136 - 142"},"PeriodicalIF":1.2,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46743396","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 : 2023-01-02DOI: 10.1080/0371750X.2022.2160376
S. Prasad, S. Bansal, A. Mansoori, M. Bala, Preeti Sharma
In this work, low cost sol-gel spin coating technique was successfully employed to deposit Mn-Ni co-doped ZnO (MNZO) thin films on glass substrates. Structural, topographical and optical properties of MNZO thin films were studied in the light of XRD spectra, Raman spectroscopy, SEM, AFM, UV-visible spectroscopy and photoluminescence spectroscopy. XRD study revealed that all annealed ZnO thin films have hexagonal wurtzite structure with (002) preferred orientation along c-axis. Hexagonal wurtzite structure for all films has been confirmed by Raman spectra which show optical phonon modes. Grain size, micropores and RMS surface roughness showed an increasing trend with the rise in annealing temperature as revealed by SEM and AFM images. The experimental data of absorption coefficient was analysed in the light of hydrogenic excitonic model to estimate excitonic binding energy (R) and other optical parameters of the prepared thin films. The excitonic binding energy decreased from 71.55 to 49.2 meV on increasing annealing temperature from 200° to 500°C. Peaks corresponding to UV, violet, green, yellow and orange were clearly observed in photoluminescence spectra for all annealed thin films. The ultraviolet peak shifted towards lower wavelength (blue-shifted) as the annealing temperature was increased. All the peaks in visible region were attributed to transition between complex intrinsic and extrinsic defects. Such films can be a potential candidate for efficient lasers and LEDs and for variety of optoelectronic device applications. GRAPHICAL ABSTRACT
{"title":"Effect of Annealing Temperature on Excitonic Binding Energy and Other Optical Properties of Mn-Ni Co-Doped Transparent ZnO Thin Films","authors":"S. Prasad, S. Bansal, A. Mansoori, M. Bala, Preeti Sharma","doi":"10.1080/0371750X.2022.2160376","DOIUrl":"https://doi.org/10.1080/0371750X.2022.2160376","url":null,"abstract":"In this work, low cost sol-gel spin coating technique was successfully employed to deposit Mn-Ni co-doped ZnO (MNZO) thin films on glass substrates. Structural, topographical and optical properties of MNZO thin films were studied in the light of XRD spectra, Raman spectroscopy, SEM, AFM, UV-visible spectroscopy and photoluminescence spectroscopy. XRD study revealed that all annealed ZnO thin films have hexagonal wurtzite structure with (002) preferred orientation along c-axis. Hexagonal wurtzite structure for all films has been confirmed by Raman spectra which show optical phonon modes. Grain size, micropores and RMS surface roughness showed an increasing trend with the rise in annealing temperature as revealed by SEM and AFM images. The experimental data of absorption coefficient was analysed in the light of hydrogenic excitonic model to estimate excitonic binding energy (R) and other optical parameters of the prepared thin films. The excitonic binding energy decreased from 71.55 to 49.2 meV on increasing annealing temperature from 200° to 500°C. Peaks corresponding to UV, violet, green, yellow and orange were clearly observed in photoluminescence spectra for all annealed thin films. The ultraviolet peak shifted towards lower wavelength (blue-shifted) as the annealing temperature was increased. All the peaks in visible region were attributed to transition between complex intrinsic and extrinsic defects. Such films can be a potential candidate for efficient lasers and LEDs and for variety of optoelectronic device applications. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"82 1","pages":"31 - 39"},"PeriodicalIF":1.2,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42237482","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 : 2023-01-02DOI: 10.1080/0371750X.2023.2173301
P. Barick, B. Saha
The research was aimed for improving the mechanical properties of reaction bonded boron carbide (RBBC) through use of two boron carbide (B4C) powders in the initial preform. Experimental results show that the Young’s modulus, Knoop hardness, and flexural strength of RBBC, produced with the combination of two powders, are greater by ∼15.2%, ∼33.8% and ∼15.5%, respectively, compared to that produced with single, i.e. fine B4C powder. The increase in ceramic phase (B4C and B4C +SiC) and reduction in residual Si content in the RBBC produced with mixed powders lead to an enhancement in its mechanical properties. Both RBBC exhibit indentation size effect and such characteristics are corroborated by their respective brittleness index. GRAPHICAL ABSTRACT
{"title":"Mixed Particle Size Effect on Improvement of Mechanical Properties of Reaction Bonded B4C","authors":"P. Barick, B. Saha","doi":"10.1080/0371750X.2023.2173301","DOIUrl":"https://doi.org/10.1080/0371750X.2023.2173301","url":null,"abstract":"The research was aimed for improving the mechanical properties of reaction bonded boron carbide (RBBC) through use of two boron carbide (B4C) powders in the initial preform. Experimental results show that the Young’s modulus, Knoop hardness, and flexural strength of RBBC, produced with the combination of two powders, are greater by ∼15.2%, ∼33.8% and ∼15.5%, respectively, compared to that produced with single, i.e. fine B4C powder. The increase in ceramic phase (B4C and B4C +SiC) and reduction in residual Si content in the RBBC produced with mixed powders lead to an enhancement in its mechanical properties. Both RBBC exhibit indentation size effect and such characteristics are corroborated by their respective brittleness index. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"82 1","pages":"56 - 64"},"PeriodicalIF":1.2,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46867913","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 : 2023-01-02DOI: 10.1080/0371750X.2022.2150687
S. H. Hashemi, R. Shoja-Razavi, A. Ashrafi, M. Erfanmanesh, Sajjad Khalili
Regarding their higher wear/corrosion resistance than conventional coatings, nickelphosphorus based composite coatings can reduce components’ costs and degradation. This study employed laser surface modification of Ni-P-SiC electroless coatings deposited on Al356 substrate, followed by investigating their microstructural changes and corrosion behavior. The results showed that increasing the laser power increases surface defects and causes substrate diffusion to the coating, which significantly reduces the corrosion resistance of the coating. In contrast, low-power laser operations can improve the corrosion resistance of Ni-P-SiC composite coatings by creating stable nickel phosphide phases, more uniform element distribution, and enhanced SiC particle-substrate coherence. All these factors increase the wear and corrosion resistance simultaneously. GRAPHICAL ABSTRACT
{"title":"Evaluating the Effect of Laser Surface Modification on the Corrosion Behavior of Ni-P-SiC Electroless Coating Deposited on Al356 Alloy","authors":"S. H. Hashemi, R. Shoja-Razavi, A. Ashrafi, M. Erfanmanesh, Sajjad Khalili","doi":"10.1080/0371750X.2022.2150687","DOIUrl":"https://doi.org/10.1080/0371750X.2022.2150687","url":null,"abstract":"Regarding their higher wear/corrosion resistance than conventional coatings, nickelphosphorus based composite coatings can reduce components’ costs and degradation. This study employed laser surface modification of Ni-P-SiC electroless coatings deposited on Al356 substrate, followed by investigating their microstructural changes and corrosion behavior. The results showed that increasing the laser power increases surface defects and causes substrate diffusion to the coating, which significantly reduces the corrosion resistance of the coating. In contrast, low-power laser operations can improve the corrosion resistance of Ni-P-SiC composite coatings by creating stable nickel phosphide phases, more uniform element distribution, and enhanced SiC particle-substrate coherence. All these factors increase the wear and corrosion resistance simultaneously. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"82 1","pages":"14 - 20"},"PeriodicalIF":1.2,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44343108","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：