Pub Date : 2020-04-28DOI: 10.17265/2161-6213/2020.3-4.001
K. K. Kyaw, Hla Toe
Cu (copper)-doped ZnO (zinc oxide) was synthesized using Cu(NO3)2·3H2O (copper (II) nitrate) and Zn(NO3)2·6H2O (zinc nitrate) by chemical co-precipitation method. The weight percentages of dopant in solution were Cu (2, 3, and 5 wt %). Cu-doped ZnO thin films were prepared on p-Si (100) substrate by screen printing method. Cu-doped ZnO/Si films were annealed at different temperatures from 300 to 700 °C. In this study, Cu-doped ZnO structures were prepared by a simple precipitation technique, and characterized by various techniques such as XRD (X-ray diffraction) and SEM (scanning electron microscope). The electrical properties of Cu-doped ZnO/Si were measured. It has found that Cu-doped ZnO/Si films can be used as optoelectronic devices.
{"title":"Characterization and Doping Effect of Cu-Doped ZnO Films","authors":"K. K. Kyaw, Hla Toe","doi":"10.17265/2161-6213/2020.3-4.001","DOIUrl":"https://doi.org/10.17265/2161-6213/2020.3-4.001","url":null,"abstract":"Cu (copper)-doped ZnO (zinc oxide) was synthesized using Cu(NO3)2·3H2O (copper (II) nitrate) and Zn(NO3)2·6H2O (zinc nitrate) by chemical co-precipitation method. The weight percentages of dopant in solution were Cu (2, 3, and 5 wt %). Cu-doped ZnO thin films were prepared on p-Si (100) substrate by screen printing method. Cu-doped ZnO/Si films were annealed at different temperatures from 300 to 700 °C. In this study, Cu-doped ZnO structures were prepared by a simple precipitation technique, and characterized by various techniques such as XRD (X-ray diffraction) and SEM (scanning electron microscope). The electrical properties of Cu-doped ZnO/Si were measured. It has found that Cu-doped ZnO/Si films can be used as optoelectronic devices.","PeriodicalId":16171,"journal":{"name":"Journal of materials science & engineering","volume":"72 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86286177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-04-28DOI: 10.17265/2161-6213/2020.3-4.003
E. Lima, M. Nava, P. C. Lima
DCT (deep cryogenic treatment) is commonly used in industry to improve the wear resistance characteristics of steels, especially. However, there are just a few researches about the effects on non-ferrous metals. The purpose of this work was to investigate how DCT affects the properties of Cu-14Al-4Ni alloy treated at different soak time and submitted to thermomechanical cycling. A comparative experimental analysis was performed of the thermal properties of alloys obtained on a vacuum furnace, treated by DCT and thermomechanically cyclized. The results indicates that thermomechanical cycling promoted the appearance and growth of the martensitic phase γ'1, less ductile than the martensitic phase β'1, which together with the induced hardening produced an increase in transformation temperatures and microhardness. The higher the number of cycles, the greater these effects. The DCT promoted an increase in the intensity of the diffraction peaks corresponding to the phase β'1 and the maintenance of them during the thermomechanical cycling of the material, which indicates that the DCT stabilizes the martensitic phase β'1 and, consequently, caused a reduction and stabilization of the martensitic transformation temperatures and the microhardness, when compared to the untreated material. The longer the soaking time of DCT, the greater these effects.
{"title":"Influence of the Deep Cryogenic Treatment at the Stabilization of Martensitic Transformation Temperatures at the Smart Material Alloy Cu-14Al-4Ni","authors":"E. Lima, M. Nava, P. C. Lima","doi":"10.17265/2161-6213/2020.3-4.003","DOIUrl":"https://doi.org/10.17265/2161-6213/2020.3-4.003","url":null,"abstract":"DCT (deep cryogenic treatment) is commonly used in industry to improve the wear resistance characteristics of steels, especially. However, there are just a few researches about the effects on non-ferrous metals. The purpose of this work was to investigate how DCT affects the properties of Cu-14Al-4Ni alloy treated at different soak time and submitted to thermomechanical cycling. A comparative experimental analysis was performed of the thermal properties of alloys obtained on a vacuum furnace, treated by DCT and thermomechanically cyclized. The results indicates that thermomechanical cycling promoted the appearance and growth of the martensitic phase γ'1, less ductile than the martensitic phase β'1, which together with the induced hardening produced an increase in transformation temperatures and microhardness. The higher the number of cycles, the greater these effects. The DCT promoted an increase in the intensity of the diffraction peaks corresponding to the phase β'1 and the maintenance of them during the thermomechanical cycling of the material, which indicates that the DCT stabilizes the martensitic phase β'1 and, consequently, caused a reduction and stabilization of the martensitic transformation temperatures and the microhardness, when compared to the untreated material. The longer the soaking time of DCT, the greater these effects.","PeriodicalId":16171,"journal":{"name":"Journal of materials science & engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89682882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-01DOI: 10.17706/ijmse.2020.8.1.1-6
Ahmad Raza Khan Rana, Alberta Canada Integrity Products Supplies Sherwood Park, Z. Farhat
Process equipment as well as their components are subjected to various damage mechanisms resulting from operating conditions, material ageing, upset conditions, environmental factors as well as neighborhood driven events. The absence of adequate inspection, repair and maintenance strategies can aggravate material problems causing pre-mature failures. This article addresses the failure incident of a newly applied Ti lining on the flange of a pressure vessel that rendered the whole process unit to outage. Further, it addresses the various factors that can be critical to the lining repairs considering various physical, metallurgical and electrochemical facets. Finally, it addresses the importance of conventional mock-up techniques towards mitigation of failure risks.
{"title":"Case Study on Failure of Ti Lining","authors":"Ahmad Raza Khan Rana, Alberta Canada Integrity Products Supplies Sherwood Park, Z. Farhat","doi":"10.17706/ijmse.2020.8.1.1-6","DOIUrl":"https://doi.org/10.17706/ijmse.2020.8.1.1-6","url":null,"abstract":"Process equipment as well as their components are subjected to various damage mechanisms resulting from operating conditions, material ageing, upset conditions, environmental factors as well as neighborhood driven events. The absence of adequate inspection, repair and maintenance strategies can aggravate material problems causing pre-mature failures. This article addresses the failure incident of a newly applied Ti lining on the flange of a pressure vessel that rendered the whole process unit to outage. Further, it addresses the various factors that can be critical to the lining repairs considering various physical, metallurgical and electrochemical facets. Finally, it addresses the importance of conventional mock-up techniques towards mitigation of failure risks.","PeriodicalId":16171,"journal":{"name":"Journal of materials science & engineering","volume":"12 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81976257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-01DOI: 10.17706/ijmse.2020.8.1.15-19
Min Jung Kim, D. Lee
High-temperature corrosion resistance and characteristics of Fe-25Cr-20Ni steel was studied at 800 oC in air and (N2/H2O/H2S)-mixed gas condition up to 100 hours. The weight gain of each test coupon after the oxidation and (N2/H2O/H2S)-mixed gas corrosion test was measured using a micro-balance. The corroded test coupons were characterized by a SEM, an EDS, an XRD with Cu-Kα radiation, and an EPMA. As a result of the experiments, aluminized diffusion coating was formed the FeAl2 intermetallic phases. Thus aluminized diffusion coated Fe-25Cr-20Ni steel has reasonable corrosion resistance, because it can form a protective alumina scale, such as α-Al2O3 layer.
研究了Fe-25Cr-20Ni钢在800℃空气和(N2/H2O/H2S)混合气体条件下长达100小时的耐高温腐蚀性能和性能。采用微天平测量氧化和(N2/H2O/H2S)混合气体腐蚀试验后各试样的增重。用SEM、EDS、cu - k - α辐射XRD和EPMA对腐蚀试样进行了表征。实验结果表明，渗铝扩散涂层形成了FeAl2金属间相。因此，渗铝扩散涂层Fe-25Cr-20Ni钢具有合理的耐腐蚀性，因为它可以形成一层保护性的氧化铝垢，如α-Al2O3层。
{"title":"Corrosion Resistance of Aluminized Diffusion coating for Fe-25Cr-20Ni steel","authors":"Min Jung Kim, D. Lee","doi":"10.17706/ijmse.2020.8.1.15-19","DOIUrl":"https://doi.org/10.17706/ijmse.2020.8.1.15-19","url":null,"abstract":"High-temperature corrosion resistance and characteristics of Fe-25Cr-20Ni steel was studied at 800 oC in air and (N2/H2O/H2S)-mixed gas condition up to 100 hours. The weight gain of each test coupon after the oxidation and (N2/H2O/H2S)-mixed gas corrosion test was measured using a micro-balance. The corroded test coupons were characterized by a SEM, an EDS, an XRD with Cu-Kα radiation, and an EPMA. As a result of the experiments, aluminized diffusion coating was formed the FeAl2 intermetallic phases. Thus aluminized diffusion coated Fe-25Cr-20Ni steel has reasonable corrosion resistance, because it can form a protective alumina scale, such as α-Al2O3 layer.","PeriodicalId":16171,"journal":{"name":"Journal of materials science & engineering","volume":"33 1","pages":"15-19"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86555668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-01DOI: 10.17706/ijmse.2020.8.1.7-14
Suphanut Kongwat, H. Hasegawa
This research proposes a proportional technique for updating an element density value for the topology optimization process. Fully stress design criterion for the topology optimization was combined with being one factor into the proportional function for updating the density value. An internal energy density was focused on the maximization problem and defined to the objective function with stress constraint. The cyclic load which the load value is not constant and vary by the time during the analysis process was applied to the structure that becomes dynamic analysis. For material property, the characteristic of isotropic and kinematic hardening plasticity was considered for the relationship between stress and strain of the structure. Finally, numerical examples were investigated to acquire the final layout and compared to the optimum design which obtained from the linear material properties under the static load.
{"title":"A Study on Proportional Topology Optimization for Nonlinearities Material with Cyclic Load","authors":"Suphanut Kongwat, H. Hasegawa","doi":"10.17706/ijmse.2020.8.1.7-14","DOIUrl":"https://doi.org/10.17706/ijmse.2020.8.1.7-14","url":null,"abstract":"This research proposes a proportional technique for updating an element density value for the topology optimization process. Fully stress design criterion for the topology optimization was combined with being one factor into the proportional function for updating the density value. An internal energy density was focused on the maximization problem and defined to the objective function with stress constraint. The cyclic load which the load value is not constant and vary by the time during the analysis process was applied to the structure that becomes dynamic analysis. For material property, the characteristic of isotropic and kinematic hardening plasticity was considered for the relationship between stress and strain of the structure. Finally, numerical examples were investigated to acquire the final layout and compared to the optimum design which obtained from the linear material properties under the static load.","PeriodicalId":16171,"journal":{"name":"Journal of materials science & engineering","volume":"40 1","pages":"7-14"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81993002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-01DOI: 10.17706/ijmse.2020.8.1.26-31
R. Suryantari, Flaviana
In this paper, the thermal-optical analysis based on images intensity distribution of thermochromic liquid crystals sample near critical temperature under crossed polarizer microscope is discussed. Thermochomic liquid crystals (TLCs) is composed from chiral nematic liquid crystals which have twisted molecular structure and optically active. TLCs show the blue-red colorplay at critical temperatures which color changes occured. According to experimental result, crossed-twist pattern appears when the temperature approaches a higher critical temperature of sample at 32 °C . The different of the molecules orientation cause uneven of intensity distribution along the twist-line. According to measurement, the length of a twist-line is equivalent to half of the pitch (p/2), which mean that the molecules twist at 180°, and also equivalent to half of sample thickness (h/2). Moreover, the consistency of twist-line length measurement at various temperatures shows the stability of twist-line near higher critical temperature.
{"title":"Images Intensity Analysis of Thermochromic Liquid Crystal near Critical Temperature","authors":"R. Suryantari, Flaviana","doi":"10.17706/ijmse.2020.8.1.26-31","DOIUrl":"https://doi.org/10.17706/ijmse.2020.8.1.26-31","url":null,"abstract":"In this paper, the thermal-optical analysis based on images intensity distribution of thermochromic liquid crystals sample near critical temperature under crossed polarizer microscope is discussed. Thermochomic liquid crystals (TLCs) is composed from chiral nematic liquid crystals which have twisted molecular structure and optically active. TLCs show the blue-red colorplay at critical temperatures which color changes occured. According to experimental result, crossed-twist pattern appears when the temperature approaches a higher critical temperature of sample at 32 °C . The different of the molecules orientation cause uneven of intensity distribution along the twist-line. According to measurement, the length of a twist-line is equivalent to half of the pitch (p/2), which mean that the molecules twist at 180°, and also equivalent to half of sample thickness (h/2). Moreover, the consistency of twist-line length measurement at various temperatures shows the stability of twist-line near higher critical temperature.","PeriodicalId":16171,"journal":{"name":"Journal of materials science & engineering","volume":"72 1","pages":"26-31"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88999369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-01DOI: 10.17706/ijmse.2020.8.1.20-25
Kazuya Ozawa, Takao Shibata, R. Ohmura
This study reports on the visual observations of the crystal growth behavior and the crystal morphology of clathrate hydrate in liquid water presaturated with the tetrahydropyran (THP) and the methane gas. THP is the partially water soluble guest substance. It was observed that the crystal growth behavior of the hydrate in methane + THP + water system greatly changed compared to those in methane + water system, and also those in the mixed gas + water soluble ionic guest substance + water system. The hydrate was initially formed at the water – THP interface. The formed hydrate was grew to a certain size and then detached from the water ‐ THP interface. The water – THP interface was maintained and then the hydrate formation was continually repeated.
{"title":"Effects of Water Soluble Guest on Clathrate Hydrate Crystal Growth","authors":"Kazuya Ozawa, Takao Shibata, R. Ohmura","doi":"10.17706/ijmse.2020.8.1.20-25","DOIUrl":"https://doi.org/10.17706/ijmse.2020.8.1.20-25","url":null,"abstract":"This study reports on the visual observations of the crystal growth behavior and the crystal morphology of clathrate hydrate in liquid water presaturated with the tetrahydropyran (THP) and the methane gas. THP is the partially water soluble guest substance. It was observed that the crystal growth behavior of the hydrate in methane + THP + water system greatly changed compared to those in methane + water system, and also those in the mixed gas + water soluble ionic guest substance + water system. The hydrate was initially formed at the water – THP interface. The formed hydrate was grew to a certain size and then detached from the water ‐ THP interface. The water – THP interface was maintained and then the hydrate formation was continually repeated.","PeriodicalId":16171,"journal":{"name":"Journal of materials science & engineering","volume":"4 1","pages":"20-25"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86059417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-28DOI: 10.17265/2161-6213/2020.1-2.002
Franziska Kröger, B. Tonn
Design of experiments (DoE) based on a linear regression model was used to develop an Aluminum Copper-based casting alloy. The main objectives of the development were the achievement of (1) a high strength at elevated temperatures with (2) a low hot tearing tendency. Within the DoE, 17 different chemical compositions of the newly developed alloy AlCuMnCo(Ni) were cast, tested regarding hot tearing tendency and characterized in tensile tests up to 300 °C. Test results showed that the AlCuMnCo(Ni)-alloys from the DoE have high mechanical properties from ambient temperature up to 300 °C and thus feature a high thermal stability. It was found that the alloying elements Cu and Co increase the yield strength whereas Mn and Ni tend to increase the attainable elongation. Furthermore, some of the alloys showed no or a very low tendency to hot tearing—a remarkable feature for Al-Cu alloys which are otherwise highly susceptible to hot tearing. The regression model that was developed from the test results fulfils a set of quality criteria and is therefore expected to provide reliable predictions. The predictive ability of the model was validated by casting and testing a sweet spot alloy. Results show that the model is sufficient for predicting the mechanical properties from ambient temperature to 250 °C. Furthermore, the sweet spot alloy surpasses the reference alloy AlCuNiCoSbZr (RR30) in its mechanical properties up to 250 °C. It was shown that by applying design of experiments, time and effort for an alloy development can effectively be reduced and simultaneously a high degree of information density about the alloying system considered is generated.
{"title":"Application of Design of Experiments for Alloy Development of an Aluminum Copper Casting Alloy","authors":"Franziska Kröger, B. Tonn","doi":"10.17265/2161-6213/2020.1-2.002","DOIUrl":"https://doi.org/10.17265/2161-6213/2020.1-2.002","url":null,"abstract":"Design of experiments (DoE) based on a linear regression model was used to develop an Aluminum Copper-based casting alloy. The main objectives of the development were the achievement of (1) a high strength at elevated temperatures with (2) a low hot tearing tendency. Within the DoE, 17 different chemical compositions of the newly developed alloy AlCuMnCo(Ni) were cast, tested regarding hot tearing tendency and characterized in tensile tests up to 300 °C. Test results showed that the AlCuMnCo(Ni)-alloys from the DoE have high mechanical properties from ambient temperature up to 300 °C and thus feature a high thermal stability. It was found that the alloying elements Cu and Co increase the yield strength whereas Mn and Ni tend to increase the attainable elongation. Furthermore, some of the alloys showed no or a very low tendency to hot tearing—a remarkable feature for Al-Cu alloys which are otherwise highly susceptible to hot tearing. The regression model that was developed from the test results fulfils a set of quality criteria and is therefore expected to provide reliable predictions. The predictive ability of the model was validated by casting and testing a sweet spot alloy. Results show that the model is sufficient for predicting the mechanical properties from ambient temperature to 250 °C. Furthermore, the sweet spot alloy surpasses the reference alloy AlCuNiCoSbZr (RR30) in its mechanical properties up to 250 °C. It was shown that by applying design of experiments, time and effort for an alloy development can effectively be reduced and simultaneously a high degree of information density about the alloying system considered is generated.","PeriodicalId":16171,"journal":{"name":"Journal of materials science & engineering","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85352527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Oustasse Abdoulaye Sall, D. Sarr, Makhaly Bâ, Atsou Edem Tchakou
This paper studies the behavior of an isolated pile under static axial load and aims to analyze this type of foundation taking into account the soil-structure interaction. The implemented approach is a finite element analysis of a numerical behavior model of the soil-pile system, with emphasis on the behavioral parametric study of the system. A three-dimensional numerical model taking into account the geometric, mechanical and geotechnical parameters of the soil was used for modeling on Ansys using finite element method (FEM). This allowed us to study the influence of soil behavior (elastic or elastoplastic perfect) on the response of the pile under axial load. The study also shows that the increase of the soil reaction module gives rise to a "dome effect" or a much more pronounced thrust in the elastoplastic domain at a certain depth. The study also shows an increase of the reaction module of the soil mass with the depth and consequently a decrease of the deformations.
{"title":"Numerical Modeling of the Behavior of a Pile Foundation under Axial Load with Ansys","authors":"Oustasse Abdoulaye Sall, D. Sarr, Makhaly Bâ, Atsou Edem Tchakou","doi":"10.12691/AJMSE-7-1-3","DOIUrl":"https://doi.org/10.12691/AJMSE-7-1-3","url":null,"abstract":"This paper studies the behavior of an isolated pile under static axial load and aims to analyze this type of foundation taking into account the soil-structure interaction. The implemented approach is a finite element analysis of a numerical behavior model of the soil-pile system, with emphasis on the behavioral parametric study of the system. A three-dimensional numerical model taking into account the geometric, mechanical and geotechnical parameters of the soil was used for modeling on Ansys using finite element method (FEM). This allowed us to study the influence of soil behavior (elastic or elastoplastic perfect) on the response of the pile under axial load. The study also shows that the increase of the soil reaction module gives rise to a \"dome effect\" or a much more pronounced thrust in the elastoplastic domain at a certain depth. The study also shows an increase of the reaction module of the soil mass with the depth and consequently a decrease of the deformations.","PeriodicalId":16171,"journal":{"name":"Journal of materials science & engineering","volume":"1 1","pages":"12-20"},"PeriodicalIF":0.0,"publicationDate":"2019-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90336220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.17706/ijmse.2018.6.4.99-105
M. Villanueva, R. Garcia, R. Cervera
Y and Sc co-doped ZrO2 [Zr0.84Y0.08Sc0.08O1.92 (4Sc4YSZ)] solid electrolyte was prepared via an alkoxide sol-gel route. 4Sc4YSZ was characterized by TG-DTA, XRD, SEM-EDS and AC impedance spectroscopy. XRD patterns showed that co-doping with Y and Sc resulted to the successful stabilization of the highly conductive cubic phase with a lattice parameter of 5.12 Å. Y and Sc dopants are well-distributed within the ZrO2 particles as evidenced by EDS elemental maps. Total conductivities from 500 °C to 700 °C were determined from AC impedance spectroscopy and an activation energy of 1.31 eV (500-650 °C) was calculated. Even at a low sintering condition of 1200 °C for 5 h, a promising conductivity of 109 mS/cm was achieved for 4Sc4YSZ at 700 °C which is higher than the conductivity of typical 8YSZ solid electrolyte.
{"title":"Synthesis and Characterization of Sc and Y Co-doped Zirconia (Zr0.84Y0.08Sc0.08O1.92) Electrolyte Prepared by Sol-Gel Method","authors":"M. Villanueva, R. Garcia, R. Cervera","doi":"10.17706/ijmse.2018.6.4.99-105","DOIUrl":"https://doi.org/10.17706/ijmse.2018.6.4.99-105","url":null,"abstract":"Y and Sc co-doped ZrO2 [Zr0.84Y0.08Sc0.08O1.92 (4Sc4YSZ)] solid electrolyte was prepared via an alkoxide sol-gel route. 4Sc4YSZ was characterized by TG-DTA, XRD, SEM-EDS and AC impedance spectroscopy. XRD patterns showed that co-doping with Y and Sc resulted to the successful stabilization of the highly conductive cubic phase with a lattice parameter of 5.12 Å. Y and Sc dopants are well-distributed within the ZrO2 particles as evidenced by EDS elemental maps. Total conductivities from 500 °C to 700 °C were determined from AC impedance spectroscopy and an activation energy of 1.31 eV (500-650 °C) was calculated. Even at a low sintering condition of 1200 °C for 5 h, a promising conductivity of 109 mS/cm was achieved for 4Sc4YSZ at 700 °C which is higher than the conductivity of typical 8YSZ solid electrolyte.","PeriodicalId":16171,"journal":{"name":"Journal of materials science & engineering","volume":"27 1","pages":"99-105"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81473170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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