Haoran Song, Tao Wang, Huan Wang, Yuxin Ma, Wen-Chen Yang, D. Yan, D. Wang, Runru Liu
The effects of precursor powder uniformity on structure and electrical properties of Gd-doped CeO2 (GDC) electrolytes were studied. The as-synthesized GDCx powders (x = 5, 10 and 15 at.%) were calcined at 600 and 1200?C and combined in mass ratios of 100:0 and 95:5 to obtain two precursor powders with different particle size distributions. Sintering of the pressed pellets was performed at 1300 and 1400?C for 10 h. Crystal structure, microstructure and electrical properties of the samples were investigated by X-ray diffraction, scanning electron microscopy and AC impedance spectroscopy, respectively. When a smaller proportion of large particles (calcined at 1200 ?C) were present in the precursor powders, sinterability of the prepared samples is slowed down, which had an adverse effect on electrical conductivity. The lower the concentration of Gd, the more significant is the adverse effect. At higher sintering temperature (1400?C), the influence of Gd concentration on microstructure and ionic conductivity is more obvious. The GDC15 sample, prepared from the precursor powder calcined at 600?C, had the highest conductivity and ?asGB/?Bulk ratio at 300?C.
{"title":"Effect of precursor powder uniformity on structure and electrical properties of gadolinium-doped cerium oxide ceramics","authors":"Haoran Song, Tao Wang, Huan Wang, Yuxin Ma, Wen-Chen Yang, D. Yan, D. Wang, Runru Liu","doi":"10.2298/pac2201042s","DOIUrl":"https://doi.org/10.2298/pac2201042s","url":null,"abstract":"The effects of precursor powder uniformity on structure and electrical properties of Gd-doped CeO2 (GDC) electrolytes were studied. The as-synthesized GDCx powders (x = 5, 10 and 15 at.%) were calcined at 600 and 1200?C and combined in mass ratios of 100:0 and 95:5 to obtain two precursor powders with different particle size distributions. Sintering of the pressed pellets was performed at 1300 and 1400?C for 10 h. Crystal structure, microstructure and electrical properties of the samples were investigated by X-ray diffraction, scanning electron microscopy and AC impedance spectroscopy, respectively. When a smaller proportion of large particles (calcined at 1200 ?C) were present in the precursor powders, sinterability of the prepared samples is slowed down, which had an adverse effect on electrical conductivity. The lower the concentration of Gd, the more significant is the adverse effect. At higher sintering temperature (1400?C), the influence of Gd concentration on microstructure and ionic conductivity is more obvious. The GDC15 sample, prepared from the precursor powder calcined at 600?C, had the highest conductivity and ?asGB/?Bulk ratio at 300?C.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68580320","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}
High colour rendering bismuth vanadate (BiVO4) pigments were successfully synthesized by self-propagating combustion method at low temperature (200?C). Interestingly, the addition of citric acid as a fuel was beneficial to the formation of well-dispersed olive-like BiVO4 particles with the size around 730 nm. Furthermore, the as-prepared pigments also exhibited high purity m-BiVO4 phase and brilliant yellow hue (b* = 78.12), which is better than that of previously reported in literature and commercially available BiVO4 yellow pigments. Importantly, the pigments were applied in various substrates (PMMA, glass and ceramics), and showed excellent colour rendering, dispersion properties, thermal and chemical stability, indicating its potential application in the high-grade plastic, glass and ceramic-ware decoration.
{"title":"Facile synthesis of high colour rendering BiVO4 yellow pigment via self-propagating combustion method","authors":"Xiaojun Zhang, Wen Li, Weihui Jiang, Yanqiao Xu, Jianye Liang, Qian Wu, L. Miao","doi":"10.2298/pac2204335z","DOIUrl":"https://doi.org/10.2298/pac2204335z","url":null,"abstract":"High colour rendering bismuth vanadate (BiVO4) pigments were successfully synthesized by self-propagating combustion method at low temperature (200?C). Interestingly, the addition of citric acid as a fuel was beneficial to the formation of well-dispersed olive-like BiVO4 particles with the size around 730 nm. Furthermore, the as-prepared pigments also exhibited high purity m-BiVO4 phase and brilliant yellow hue (b* = 78.12), which is better than that of previously reported in literature and commercially available BiVO4 yellow pigments. Importantly, the pigments were applied in various substrates (PMMA, glass and ceramics), and showed excellent colour rendering, dispersion properties, thermal and chemical stability, indicating its potential application in the high-grade plastic, glass and ceramic-ware decoration.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68581919","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 effects of carbon sources and carbon content on the density, microstructure, hardness and elastic properties of dense SiC ceramics were investigated. The precursor powders were prepared by adding 1.5-4.5wt.% C (carbon lamp black or phenolic resin) and 0.5 wt.% B4C to SiC and sintered at 1900?C for 15min under 50MPa pressure in argon with an intermediate dwell at 1400?C for 30min. The results showed that carbon lamp black provided better mixing than phenolic resin since carbon cluster was found in the samples made with phenolic resin. Increasing carbon content causes the decrease of 4H polytype amount in the samples. The presence of higher than 1.5wt.% carbon inhibits grain growth and the presence of the 4H polytype. SiC samples can be produced with relative density of more than 99%TD with 1.5wt.% carbon lamp black addition which shows small average grain size, high elastic modulus and hardness of 2.28 ?m, 453GPa and 21.2GPa, respectively.
{"title":"The influence of carbon source and content on structure and mechanical properties of sic processed via spark plasma sintering method","authors":"Z. Yaşar, V. Delucca, R. Haber","doi":"10.2298/pac2204384y","DOIUrl":"https://doi.org/10.2298/pac2204384y","url":null,"abstract":"The effects of carbon sources and carbon content on the density, microstructure, hardness and elastic properties of dense SiC ceramics were investigated. The precursor powders were prepared by adding 1.5-4.5wt.% C (carbon lamp black or phenolic resin) and 0.5 wt.% B4C to SiC and sintered at 1900?C for 15min under 50MPa pressure in argon with an intermediate dwell at 1400?C for 30min. The results showed that carbon lamp black provided better mixing than phenolic resin since carbon cluster was found in the samples made with phenolic resin. Increasing carbon content causes the decrease of 4H polytype amount in the samples. The presence of higher than 1.5wt.% carbon inhibits grain growth and the presence of the 4H polytype. SiC samples can be produced with relative density of more than 99%TD with 1.5wt.% carbon lamp black addition which shows small average grain size, high elastic modulus and hardness of 2.28 ?m, 453GPa and 21.2GPa, respectively.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68582380","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}
Novel cathode materials for solid oxide fuel cells based on Ba-doped Sr2Fe1.5Mo0.5O6 (Sr2-xBaxFe1.5Mo0.5O6-? where x = 0.3, 0.5, 0.7 and 0.9) were synthesized by solution combustion method and sintered at 1200?C. Their phase composition, microstructure and electrical conductivity were studied. It was shown that the maximal electrical conductivity of 18.5 S/cm at 450?C was measured for the Sr1.3Ba0.7Fe1.5Mo0.5O6-? ceramics. The superior chemical compatibility between the Sr2-xBaxFe1.5Mo0.5O6-? cathode and Gd0.2Ce0.8O1.9 electrolyte was confirmed, as well as good matching between thermal expansion coefficients of the cathode and electrolyte materials.
{"title":"Novel cathode material for solid oxide fuel cells based on Ba-doped Sr2Fe1.5Mo0.5O6","authors":"Pan Wang, Weixing Qian, Ronghao Xu, Jihai Cheng","doi":"10.2298/pac2201064w","DOIUrl":"https://doi.org/10.2298/pac2201064w","url":null,"abstract":"Novel cathode materials for solid oxide fuel cells based on Ba-doped Sr2Fe1.5Mo0.5O6 (Sr2-xBaxFe1.5Mo0.5O6-? where x = 0.3, 0.5, 0.7 and 0.9) were synthesized by solution combustion method and sintered at 1200?C. Their phase composition, microstructure and electrical conductivity were studied. It was shown that the maximal electrical conductivity of 18.5 S/cm at 450?C was measured for the Sr1.3Ba0.7Fe1.5Mo0.5O6-? ceramics. The superior chemical compatibility between the Sr2-xBaxFe1.5Mo0.5O6-? cathode and Gd0.2Ce0.8O1.9 electrolyte was confirmed, as well as good matching between thermal expansion coefficients of the cathode and electrolyte materials.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68580072","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}
In the present study, hydroxyapatite-titania-graphene oxide (HA-TiO2-GO) nanostructured ternary composites were deposited on Ti-6Al-4V alloy by using electrophoretic deposition. The well-dispersed stable suspensions of hydroxyapatite particles with 20wt.% TiO2 and 0, 0.5, 1 and 2 wt.% GO were prepared and electrophoretic deposition was performed at an optimum voltage of 20 V for 90 s. A novel linear approach of fracturemechanics was applied to evaluate the fracture toughness of the coatings from the recorded forces and depth of penetration by using an incremental-load micro-scratch technique. The distances and contact pressures indicating crack formation and coating spallation, as well as the value of fracture toughness were obtained at the maximum level for the composite coatings with 20 wt.% TiO2 and 2 wt.% GO. The rapid apatite forming ability as well as improved corrosion resistance of the composite coatings with 20 wt.% titania and 2 wt.% GO were analysed by electrochemical impedance spectroscopy, SEM and XRD.
{"title":"Effect of graphene oxide on micro-tribological and electrochemical properties of electrophoretically deposited HA-TiO2-GO composite coatings","authors":"Neda Ramezannejad, H. Farnoush","doi":"10.2298/pac2201030r","DOIUrl":"https://doi.org/10.2298/pac2201030r","url":null,"abstract":"In the present study, hydroxyapatite-titania-graphene oxide (HA-TiO2-GO) nanostructured ternary composites were deposited on Ti-6Al-4V alloy by using electrophoretic deposition. The well-dispersed stable suspensions of hydroxyapatite particles with 20wt.% TiO2 and 0, 0.5, 1 and 2 wt.% GO were prepared and electrophoretic deposition was performed at an optimum voltage of 20 V for 90 s. A novel linear approach of fracturemechanics was applied to evaluate the fracture toughness of the coatings from the recorded forces and depth of penetration by using an incremental-load micro-scratch technique. The distances and contact pressures indicating crack formation and coating spallation, as well as the value of fracture toughness were obtained at the maximum level for the composite coatings with 20 wt.% TiO2 and 2 wt.% GO. The rapid apatite forming ability as well as improved corrosion resistance of the composite coatings with 20 wt.% titania and 2 wt.% GO were analysed by electrochemical impedance spectroscopy, SEM and XRD.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68580220","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 fibres reinforced thin architectural ceramic plates of 900?1800?2.5mm with excellent mechanical properties were prepared by fast-sintering method using a controllable fibre dispersion process. The effects of ball-milling time on dispersity, average length-to-diameter ratio and microstructure of alumina fibres were investigated. Meanwhile, the effects of alumina fibre contents on the bulk density, water absorption, phase transformation and microstructure of the thin ceramic plate were researched. It was found that the two-step ball-milling process can effectively control the average length-to-diameter ratio of alumina fibres, achieving a good dispersion mixture of fibres and ceramic powders. Ceramics bulk density and bending strength increase with fibre contents rise from 0 to 5 wt.% and then decrease with further fibre content addition from 5 to 15wt.%. The in situ formed mullite whiskers via fast-sintering method are beneficial for protecting fibres and fibre/matrix interfaces. The maximum value of bending strength and fracture toughness reach 147MPa for 5 wt.% fibre contents and 2.6MPa?m1/2 for 9 wt.%fibre contents, corresponding to the strengthening of alumina fibres and the formation of mullite whiskers in fibre/matrix interfaces and matrix via fast-sintering process.
{"title":"Mechanical properties of large-sized thin architectural ceramic plate enhanced by alumina fibres and in situ mullite whiskers","authors":"Xinzi Zhong, Liyun Cao, Jianfeng Huang, Yijun Liu, Haibo Ouyang, Qinggang Wang","doi":"10.2298/pac2202183z","DOIUrl":"https://doi.org/10.2298/pac2202183z","url":null,"abstract":"The fibres reinforced thin architectural ceramic plates of 900?1800?2.5mm with excellent mechanical properties were prepared by fast-sintering method using a controllable fibre dispersion process. The effects of ball-milling time on dispersity, average length-to-diameter ratio and microstructure of alumina fibres were investigated. Meanwhile, the effects of alumina fibre contents on the bulk density, water absorption, phase transformation and microstructure of the thin ceramic plate were researched. It was found that the two-step ball-milling process can effectively control the average length-to-diameter ratio of alumina fibres, achieving a good dispersion mixture of fibres and ceramic powders. Ceramics bulk density and bending strength increase with fibre contents rise from 0 to 5 wt.% and then decrease with further fibre content addition from 5 to 15wt.%. The in situ formed mullite whiskers via fast-sintering method are beneficial for protecting fibres and fibre/matrix interfaces. The maximum value of bending strength and fracture toughness reach 147MPa for 5 wt.% fibre contents and 2.6MPa?m1/2 for 9 wt.%fibre contents, corresponding to the strengthening of alumina fibres and the formation of mullite whiskers in fibre/matrix interfaces and matrix via fast-sintering process.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68581275","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}
B. Mohammadi, S. Shabani, S. Mirkazemi, Y. Vahidshad, Akram Dorani
Sol-gel/oil-drop granulation technique was used to prepare mesoporous ?-Al2O3 granules of 1.5-2mm with high specific surface area and pore volume of 295m2/g and 0.47 cm3/g, respectively. The structure of granules was studied using powder XRD, DTA, TEM and N2 adsorption/desorption techniques. A response surface methodology (RSM) holding CCD approach was used for modelling the influence of process variables on the granule pore structure, having a quadratic function relating the independent variables (calcination temperature, acid amount and ammonia concentration) to the responses (specific surface area, mean pore diameter and pore volume). The interaction effect of variables on each response was studied and all were in acceptable accordance with experimental values. Accordingly, the granules synthesized using 20ml of nitric acid, aged in a 9.25wt.% ammonia solution and calcined at 450?C showed the best properties. The predicted values for the specific surface area and pore volume were 315.64m2/g, 7 nm and 0.53 cm3/g, respectively, which were compatible with experimental values.
{"title":"The effects of processing parameters on structure of mesoporous γ-alumina granules synthesized by sol-gel/oil-drop method: Modelling via response surface methodology","authors":"B. Mohammadi, S. Shabani, S. Mirkazemi, Y. Vahidshad, Akram Dorani","doi":"10.2298/pac2203267m","DOIUrl":"https://doi.org/10.2298/pac2203267m","url":null,"abstract":"Sol-gel/oil-drop granulation technique was used to prepare mesoporous ?-Al2O3 granules of 1.5-2mm with high specific surface area and pore volume of 295m2/g and 0.47 cm3/g, respectively. The structure of granules was studied using powder XRD, DTA, TEM and N2 adsorption/desorption techniques. A response surface methodology (RSM) holding CCD approach was used for modelling the influence of process variables on the granule pore structure, having a quadratic function relating the independent variables (calcination temperature, acid amount and ammonia concentration) to the responses (specific surface area, mean pore diameter and pore volume). The interaction effect of variables on each response was studied and all were in acceptable accordance with experimental values. Accordingly, the granules synthesized using 20ml of nitric acid, aged in a 9.25wt.% ammonia solution and calcined at 450?C showed the best properties. The predicted values for the specific surface area and pore volume were 315.64m2/g, 7 nm and 0.53 cm3/g, respectively, which were compatible with experimental values.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":"33 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68581601","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}
In this study, zirconium nitride (ZrN) powders were prepared using zirconium oxide (ZrO2) and carbon black via the dynamic thermochemical method, called the dynamic carbothermal reduction and nitridation (DCRN) method. The effects of process temperatures on phase transformation and produced powder morphologies in a dynamic system under flowing nitrogen atmosphere were investigated by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. For this purpose, the various test parameters were investigated, such as reaction temperatures (1400, 1450, 1500?C), reaction time (1, 2, 3 h) and rotation rates (2, 4, 6 rpm). The results show that ZrN powders of sub-micron size can be obtained at 1500?C for 1h and 4 rpm by the dynamic thermochemical method.
{"title":"Synthesizing of zirconium nitride powders by dynamic thermochemical method","authors":"B. Özdemir, N. Canikoğlu","doi":"10.2298/pac2204303o","DOIUrl":"https://doi.org/10.2298/pac2204303o","url":null,"abstract":"In this study, zirconium nitride (ZrN) powders were prepared using zirconium oxide (ZrO2) and carbon black via the dynamic thermochemical method, called the dynamic carbothermal reduction and nitridation (DCRN) method. The effects of process temperatures on phase transformation and produced powder morphologies in a dynamic system under flowing nitrogen atmosphere were investigated by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. For this purpose, the various test parameters were investigated, such as reaction temperatures (1400, 1450, 1500?C), reaction time (1, 2, 3 h) and rotation rates (2, 4, 6 rpm). The results show that ZrN powders of sub-micron size can be obtained at 1500?C for 1h and 4 rpm by the dynamic thermochemical method.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68582225","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}
M. Oughanem, R. Douani, N. Lamrani, Y. Guhel, A. Chaouchi, B. Boudart
In the present work, pure BiFeO3 (BFO) particles were synthesized by sol-gel method and mixed with carbon fibre to form composites (x%CFs-BFO, where x corresponds to 0, 4, 8 and 10 wt.%) by hydrothermal treatment at 150?C. The resulting composite powders were characterized by X-ray diffraction, Raman spectroscopy, nitrogen adsorption/desorption isotherm and scanning electron microscopy (SEM-EDX). The synthesized powders were used for gas sensors preparation by manual deposition of their mixture with polyvinyl alcohol on alumina tubes ending with two silver electrodes. The impedance of the sensitive layers was determined by impedance spectroscopy in the temperature range 100-250?C at different gaseous concentrations. The detection properties of the fabricated sensors for various volatile organic compounds were investigated. The sensors showed better sensitivity to acetone compared to other gases. The addition of carbon fibres improved the sensitivity to acetone vapour from 64 to 135% at 100 ppm and reduced the optimum operating temperature of the sensors by 20?C and the response and recovery times from (26 s/15 s) to (18 s/10 s). This study revealed that x%CFs-BiFeO3 composites are promising candidates for gas sensors.
{"title":"Enhanced volatile organic compound sensing properties of BiFeO3 by carbon fibres addition","authors":"M. Oughanem, R. Douani, N. Lamrani, Y. Guhel, A. Chaouchi, B. Boudart","doi":"10.2298/pac2204310o","DOIUrl":"https://doi.org/10.2298/pac2204310o","url":null,"abstract":"In the present work, pure BiFeO3 (BFO) particles were synthesized by sol-gel method and mixed with carbon fibre to form composites (x%CFs-BFO, where x corresponds to 0, 4, 8 and 10 wt.%) by hydrothermal treatment at 150?C. The resulting composite powders were characterized by X-ray diffraction, Raman spectroscopy, nitrogen adsorption/desorption isotherm and scanning electron microscopy (SEM-EDX). The synthesized powders were used for gas sensors preparation by manual deposition of their mixture with polyvinyl alcohol on alumina tubes ending with two silver electrodes. The impedance of the sensitive layers was determined by impedance spectroscopy in the temperature range 100-250?C at different gaseous concentrations. The detection properties of the fabricated sensors for various volatile organic compounds were investigated. The sensors showed better sensitivity to acetone compared to other gases. The addition of carbon fibres improved the sensitivity to acetone vapour from 64 to 135% at 100 ppm and reduced the optimum operating temperature of the sensors by 20?C and the response and recovery times from (26 s/15 s) to (18 s/10 s). This study revealed that x%CFs-BiFeO3 composites are promising candidates for gas sensors.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":"422 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68582247","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}
Hongmin Ao, Heng Wu, Wenchuan Li, Mengshuang Lan, Zhixin Zeng, Qin Zhang, R. Gao, X. Deng, Gang Chen, C. Fu, Zhenhua Wang, X. Lei, W. Cai
Multiferroic materials attracted much attention because of magnetoelectric (ME) coupling effect. Herein, a typical single-phase multiferroic BiFeO3 (BFO) was co-doped at A and B sites by solid-state method, and Bi0.78La0.08Sm0.14Fe0.85Ti0.15O3 (BLSFTO) ceramics were prepared at different sintering temperatures (940, 960, 980 and, 1000?C). The effects of sintering temperature on the microstructure, morphology, dielectric, ferroelectric and magnetic properties were systematically studied. The remanent polarization (Pr) and coercive field (Ec) of the BLSFTO ceramics show a non-linear change with sintering temperature. The remanent polarization reaches maximum (0.0560 ?C/cm2) in the sample sintered at 1000?C, whereas the maximum Ec of 1.32 kV/cm was obtained in the specimen sintered at 940?C. The remanent magnetization (Mr) increases with the increase of sintering temperature, while change of the saturation magnetization with sintering temperature is negligible. When BLSFTO specimen is sintered at 1000?C, Mr reaches the maximal value of 0.1344 emu/g.
{"title":"Effect of sintering temperatures on the magnetoelectric properties of Bi0.78La0.08Sm0.14Fe0.85Ti0.15O3 ceramics","authors":"Hongmin Ao, Heng Wu, Wenchuan Li, Mengshuang Lan, Zhixin Zeng, Qin Zhang, R. Gao, X. Deng, Gang Chen, C. Fu, Zhenhua Wang, X. Lei, W. Cai","doi":"10.2298/pac2202089a","DOIUrl":"https://doi.org/10.2298/pac2202089a","url":null,"abstract":"Multiferroic materials attracted much attention because of magnetoelectric (ME) coupling effect. Herein, a typical single-phase multiferroic BiFeO3 (BFO) was co-doped at A and B sites by solid-state method, and Bi0.78La0.08Sm0.14Fe0.85Ti0.15O3 (BLSFTO) ceramics were prepared at different sintering temperatures (940, 960, 980 and, 1000?C). The effects of sintering temperature on the microstructure, morphology, dielectric, ferroelectric and magnetic properties were systematically studied. The remanent polarization (Pr) and coercive field (Ec) of the BLSFTO ceramics show a non-linear change with sintering temperature. The remanent polarization reaches maximum (0.0560 ?C/cm2) in the sample sintered at 1000?C, whereas the maximum Ec of 1.32 kV/cm was obtained in the specimen sintered at 940?C. The remanent magnetization (Mr) increases with the increase of sintering temperature, while change of the saturation magnetization with sintering temperature is negligible. When BLSFTO specimen is sintered at 1000?C, Mr reaches the maximal value of 0.1344 emu/g.","PeriodicalId":20596,"journal":{"name":"Processing and Application of Ceramics","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68580454","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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