Pub Date : 2023-04-01DOI: 10.1590/0366-69132023693903426
A. L. D. Santos, A. S. Amaral, C. R. S. Souza, D. C. Batista, E. Paris, A. T. Figueiredo, T. Giraldi
of Nb 2 O 5 combined with Al 2 O 3 on a solid silica matrix prepared by a sol-gel process as an adsorbent for Cd 2+ ions. The adsorbent exhibited high porosity and specific surface area (323 m 2 .g -1 ). The high specific surface area contributed to increasing the accessibility of adsorbent sites to Cd 2+ ions. Furthermore, the porous silica material modified with metal oxides had high stability and showed promise for the development of new materials that adsorb metal ions. In a similar line of research, Diniz et al. [21] combined Nb 2 O 5 with ZnO dispersed on a silica matrix by the sol-gel method for the adsorption of Co 2+ ions in water and food samples. The material exhibited high surface area and had a maximum adsorption capacity of 0.518 mg.g -1 , showing potential as an adsorbing agent. Cavalcanti et al. [6] used zeolite-based adsorbents
{"title":"Influence of structural and surface properties of Nb2O5 pellets on methylene blue adsorption and adsorbent reuse capacity","authors":"A. L. D. Santos, A. S. Amaral, C. R. S. Souza, D. C. Batista, E. Paris, A. T. Figueiredo, T. Giraldi","doi":"10.1590/0366-69132023693903426","DOIUrl":"https://doi.org/10.1590/0366-69132023693903426","url":null,"abstract":"of Nb 2 O 5 combined with Al 2 O 3 on a solid silica matrix prepared by a sol-gel process as an adsorbent for Cd 2+ ions. The adsorbent exhibited high porosity and specific surface area (323 m 2 .g -1 ). The high specific surface area contributed to increasing the accessibility of adsorbent sites to Cd 2+ ions. Furthermore, the porous silica material modified with metal oxides had high stability and showed promise for the development of new materials that adsorb metal ions. In a similar line of research, Diniz et al. [21] combined Nb 2 O 5 with ZnO dispersed on a silica matrix by the sol-gel method for the adsorption of Co 2+ ions in water and food samples. The material exhibited high surface area and had a maximum adsorption capacity of 0.518 mg.g -1 , showing potential as an adsorbing agent. Cavalcanti et al. [6] used zeolite-based adsorbents","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47071564","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 : 2023-04-01DOI: 10.1590/0366-69132023693903431
M. Bolino, D. Richard, M. Tejerina
A study of ZnO-based ceramic films prepared by the spray-pyrolysis technique is presented. Pure and Ni-doped thin film samples were deposited as a coating on a glass substrate and experimentally characterized using scanning electron and atomic force microscopies, X-ray diffraction, and UV-vis-NIR spectroscopy. The morphologic, crystallographic, and optical properties were analyzed. Structural and electronic properties were compared to predictions obtained from computational calculations based on the density functional theory plus U approach (DFT+U). All these simulations provided additional data that could be used as a reference for material modeling and a better understanding of the experimental results. It was found that spray pyrolysis can be used to produce thin film ceramic samples (~300 nm) with low amounts (<5%) of Ni impurities substitutionally located at the cationic sites of the ZnO wurtzite host structure. The results of this investigation showed that an experimental and theoretical study aided in a better characterization of the thin films, and helped to outline a more robust model of the samples.
{"title":"Nickel-doped zinc oxide thin films made by spray pyrolysis: experimental characterization and theoretical analyses","authors":"M. Bolino, D. Richard, M. Tejerina","doi":"10.1590/0366-69132023693903431","DOIUrl":"https://doi.org/10.1590/0366-69132023693903431","url":null,"abstract":"A study of ZnO-based ceramic films prepared by the spray-pyrolysis technique is presented. Pure and Ni-doped thin film samples were deposited as a coating on a glass substrate and experimentally characterized using scanning electron and atomic force microscopies, X-ray diffraction, and UV-vis-NIR spectroscopy. The morphologic, crystallographic, and optical properties were analyzed. Structural and electronic properties were compared to predictions obtained from computational calculations based on the density functional theory plus U approach (DFT+U). All these simulations provided additional data that could be used as a reference for material modeling and a better understanding of the experimental results. It was found that spray pyrolysis can be used to produce thin film ceramic samples (~300 nm) with low amounts (<5%) of Ni impurities substitutionally located at the cationic sites of the ZnO wurtzite host structure. The results of this investigation showed that an experimental and theoretical study aided in a better characterization of the thin films, and helped to outline a more robust model of the samples.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186639","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 : 2023-04-01DOI: 10.1590/0366-69132023693903396
A. A. Barbosa, S. A. Júnior, A. Ferraz
The need for the reconstruction of large bone defects is an issue that arouses great interest in the field of materials science. The development of synthetic grafts similar to bone tissue is a promising option. Thus, this study proposes the synthesis of a zinc oxide and calcium phosphate composite in order to evaluate both its properties and its potential for bone applications. The synthesis of the HAp/TCP@ZnO composite was carried out in two stages; first, the precipitation method was employed. In the second stage, the ZnO was incorporated into the powder produced in the first stage. After the characterization of the material, the presence of HAp in its X-ray diffractogram as the major phase and TCP as the secondary phase was verified; moreover, ZnO peaks were also detected. Tests in a simulated body fluid indicated that the composite was highly bioactive, whereas hemolysis tests confirmed its non-toxicity. The addition of 10.0% of ZnO to the biomaterial provided it with antimicrobial properties.
{"title":"A study of the bioactivity, hemocompatibility and antimicrobial properties of a zinc oxide and calcium phosphate composite for bone regeneration","authors":"A. A. Barbosa, S. A. Júnior, A. Ferraz","doi":"10.1590/0366-69132023693903396","DOIUrl":"https://doi.org/10.1590/0366-69132023693903396","url":null,"abstract":"The need for the reconstruction of large bone defects is an issue that arouses great interest in the field of materials science. The development of synthetic grafts similar to bone tissue is a promising option. Thus, this study proposes the synthesis of a zinc oxide and calcium phosphate composite in order to evaluate both its properties and its potential for bone applications. The synthesis of the HAp/TCP@ZnO composite was carried out in two stages; first, the precipitation method was employed. In the second stage, the ZnO was incorporated into the powder produced in the first stage. After the characterization of the material, the presence of HAp in its X-ray diffractogram as the major phase and TCP as the secondary phase was verified; moreover, ZnO peaks were also detected. Tests in a simulated body fluid indicated that the composite was highly bioactive, whereas hemolysis tests confirmed its non-toxicity. The addition of 10.0% of ZnO to the biomaterial provided it with antimicrobial properties.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"13 1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186687","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 : 2023-04-01DOI: 10.1590/0366-69132023693903423
M. Al-Aaraji, A. H. Uqla
Lead-based (PZT) ferroelectric ceramic materials were prepared utilizing the solid-state reaction method as a pure and doped with different additives. As a pure form, the composition with the chemical formula Pb 1.03 (Zr 0.56 Ti 0.44 )O 3 characterized as rhombohedral structure according to the PZT phase diagram region was investigated systematically. Different strategies of doping were followed to investigate the influence of donor and acceptor ions in addition to complex doping on structural and microstructure properties of the parent composition: for the soft ceramic, 2 mol% lanthanum-doped PZT at A-site (PLZT), whereas 2 mol% of scandium-doped PZT at B-site to produce hard ceramic (PSZT). In terms of complex doping, 2 mol% of both La 3+ and Sc 3+ substituted A-and B-site, respectively (PLSZT). All samples showed dense and homogeneous microstructures, except PSZT ceramic displayed a small grain size. X-ray diffraction results showed that the addition of Sc 3+ induced phase transformation and formation of a coexistence region consisting of tetragonal and rhombohedral phases. This region was recognized in both PSZT and PLSZT compositions. Hard ceramic (Sc 3+ -doped PZT) exhibited the highest values of relative permittivity and lowest dielectric loss at a frequency of 100 kHz.
{"title":"Investigation of structural and electrical characteristics of PZT ceramics modified with donor and acceptor dopants","authors":"M. Al-Aaraji, A. H. Uqla","doi":"10.1590/0366-69132023693903423","DOIUrl":"https://doi.org/10.1590/0366-69132023693903423","url":null,"abstract":"Lead-based (PZT) ferroelectric ceramic materials were prepared utilizing the solid-state reaction method as a pure and doped with different additives. As a pure form, the composition with the chemical formula Pb 1.03 (Zr 0.56 Ti 0.44 )O 3 characterized as rhombohedral structure according to the PZT phase diagram region was investigated systematically. Different strategies of doping were followed to investigate the influence of donor and acceptor ions in addition to complex doping on structural and microstructure properties of the parent composition: for the soft ceramic, 2 mol% lanthanum-doped PZT at A-site (PLZT), whereas 2 mol% of scandium-doped PZT at B-site to produce hard ceramic (PSZT). In terms of complex doping, 2 mol% of both La 3+ and Sc 3+ substituted A-and B-site, respectively (PLSZT). All samples showed dense and homogeneous microstructures, except PSZT ceramic displayed a small grain size. X-ray diffraction results showed that the addition of Sc 3+ induced phase transformation and formation of a coexistence region consisting of tetragonal and rhombohedral phases. This region was recognized in both PSZT and PLSZT compositions. Hard ceramic (Sc 3+ -doped PZT) exhibited the highest values of relative permittivity and lowest dielectric loss at a frequency of 100 kHz.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186474","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 : 2023-04-01DOI: 10.1590/0366-69132023693903427
G. Djafri, M. Bouzeroura, M. Meziani, N. Chelouah
This work examines the impact of mordenite-rich tuff (MT) on the technological properties of fired clay brick. These specimens were obtained by substituting clay with MT in various proportions (0, 5, 10, 15, 20, 50, and 100 wt%). They were pressed at 10 MPa, air-dried in the laboratory, and fired at 900 °C using two different clays: clay of Remila (CR) and clay of Adjiba (CA), Algeria. The mechanical, thermal, and physical properties of fired bricks were determined and compared to those of control bricks (0 wt%). According to the finding, the partial and total substitution of clay by MT reduced the sample’s thermal conductivity and bulk density. Thus, the MT increased the apparent porosity and the water absorption of clay brick while maintaining the compressive strength within the limits of the Algerian standards. This research revealed the possibility of producing bricks containing up to 100% by weight of MT with the required technical and environmental properties.
{"title":"Using mordenite-rich tuff as a natural clay replacement in fired clay brick production","authors":"G. Djafri, M. Bouzeroura, M. Meziani, N. Chelouah","doi":"10.1590/0366-69132023693903427","DOIUrl":"https://doi.org/10.1590/0366-69132023693903427","url":null,"abstract":"This work examines the impact of mordenite-rich tuff (MT) on the technological properties of fired clay brick. These specimens were obtained by substituting clay with MT in various proportions (0, 5, 10, 15, 20, 50, and 100 wt%). They were pressed at 10 MPa, air-dried in the laboratory, and fired at 900 °C using two different clays: clay of Remila (CR) and clay of Adjiba (CA), Algeria. The mechanical, thermal, and physical properties of fired bricks were determined and compared to those of control bricks (0 wt%). According to the finding, the partial and total substitution of clay by MT reduced the sample’s thermal conductivity and bulk density. Thus, the MT increased the apparent porosity and the water absorption of clay brick while maintaining the compressive strength within the limits of the Algerian standards. This research revealed the possibility of producing bricks containing up to 100% by weight of MT with the required technical and environmental properties.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186557","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 : 2023-04-01DOI: 10.1590/0366-69132023693903474
J. M. D. Silva, F. P. M. Fenandes, M. de O. Silva, T. G. Maraschin, L. S. Ferreira, D. A. Macedo, L. B. da Silva, F. de C. Fim
Graphene oxide (GO) is one of the main precursors for the production of graphene and other graphene-based materials. We report a simple, safe, and fast synthesis method to obtain graphene oxide as a functional material for battery-type electrodes. Washing and lyophilization processes were performed to evaluate their effects on exfoliation and removal of functional groups from graphene sheets. Sample GO1 consisted of a 10-layer stack of oxidized graphene, while sample GO2 had 8 stacked layers. The difference between them was an extra washing and lyophilization process in the GO2 sample. The electrochemical performance of graphene oxide-based electrodes, classified as battery-type, indicated an improved specific capacity of 10.15 C.g-1 for GO1 against 4.55 C.g-1 for GO2 at a specific current of 0.5 A.g-1. This superior battery-type behavior of the GO1 electrode, also confirmed by electrochemical impedance spectroscopy, was most likely due to a higher degree of oxygenated groups on its surface, as shown by energy dispersive spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR) studies.
{"title":"Facile synthesis, structure, and battery-type behavior of graphene oxides","authors":"J. M. D. Silva, F. P. M. Fenandes, M. de O. Silva, T. G. Maraschin, L. S. Ferreira, D. A. Macedo, L. B. da Silva, F. de C. Fim","doi":"10.1590/0366-69132023693903474","DOIUrl":"https://doi.org/10.1590/0366-69132023693903474","url":null,"abstract":"Graphene oxide (GO) is one of the main precursors for the production of graphene and other graphene-based materials. We report a simple, safe, and fast synthesis method to obtain graphene oxide as a functional material for battery-type electrodes. Washing and lyophilization processes were performed to evaluate their effects on exfoliation and removal of functional groups from graphene sheets. Sample GO1 consisted of a 10-layer stack of oxidized graphene, while sample GO2 had 8 stacked layers. The difference between them was an extra washing and lyophilization process in the GO2 sample. The electrochemical performance of graphene oxide-based electrodes, classified as battery-type, indicated an improved specific capacity of 10.15 C.g-1 for GO1 against 4.55 C.g-1 for GO2 at a specific current of 0.5 A.g-1. This superior battery-type behavior of the GO1 electrode, also confirmed by electrochemical impedance spectroscopy, was most likely due to a higher degree of oxygenated groups on its surface, as shown by energy dispersive spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR) studies.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135722641","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 : 2023-04-01DOI: 10.1590/0366-69132023693903407
A. Mocciaro, J. M. Martínez, P. V. López, M. S. Conconi, N. Rendtorff
Microstructure, texture, and mechanical and fracture characterization of three insulating commercial refractories were carried out in order to establish a correlation between these properties. The materials were characterized using X-ray powder diffraction (XRD) with Rietveld and Le Bail approximation to perform phase quantification, mercury intrusion porosimetry
{"title":"Mechanical and fracture behavior of insulating refractory bricks","authors":"A. Mocciaro, J. M. Martínez, P. V. López, M. S. Conconi, N. Rendtorff","doi":"10.1590/0366-69132023693903407","DOIUrl":"https://doi.org/10.1590/0366-69132023693903407","url":null,"abstract":"Microstructure, texture, and mechanical and fracture characterization of three insulating commercial refractories were carried out in order to establish a correlation between these properties. The materials were characterized using X-ray powder diffraction (XRD) with Rietveld and Le Bail approximation to perform phase quantification, mercury intrusion porosimetry","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186385","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 : 2023-04-01DOI: 10.1590/0366-69132023693903366
E. Tolentino, F. C. Oliveira, L. A. Campos, J. T. Tolentino Júnior, F. Ramos
Some experimental results concerning the performance of fiber-reinforced soil composites made of soil and shredded fibers from waste tires are presented. The composite mixtures were prepared with fiber addition of 0, 15, 30
{"title":"Performance of soil-matrix composite reinforced with recycled shredded fibers from waste tires","authors":"E. Tolentino, F. C. Oliveira, L. A. Campos, J. T. Tolentino Júnior, F. Ramos","doi":"10.1590/0366-69132023693903366","DOIUrl":"https://doi.org/10.1590/0366-69132023693903366","url":null,"abstract":"Some experimental results concerning the performance of fiber-reinforced soil composites made of soil and shredded fibers from waste tires are presented. The composite mixtures were prepared with fiber addition of 0, 15, 30","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186618","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 : 2023-04-01DOI: 10.1590/0366-69132023693903436
R. Nascimento, B. Figueira, E. F. Neto, A. A. Rabelo, O. Fernandez, P. T. S. D. Luz, M. L. D. Costa
It is described for the first time the synthesis and characterization of NiMn 2 O 4 employing the Mn ores from the Amazon Region as starting material, instead of using commercial reagents as normally occurs in its synthesis process. Initially, an Mn ore was transformed into a single product, the octahedral layer (OL) manganese oxide with Ni 2+ ions interlayer (Ni-OL-2), which was used as a matrix to obtain NiMn 2 O 4 by thermal decomposition. The following techniques were used for characterization: X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), infrared spectroscopy (FTIR), thermal analysis (TG-DTA), scanning (SEM) and transmission (TEM) electron microscopies. The results revealed that Mn oxide ore composed of nsutite mineral transformed into a well -ordered crystalline Ni-OL-2 phase, after the hydrothermal and cation exchange process. The thermal decomposition of Ni-OL-2 produced the nickel manganite phase at 850 °C with spherical ball morphology and crystal sizes in the range of 200-300 nm.
{"title":"Thermal synthesis of NiMn2O4 spinel employing Mn oxide ores as starting material","authors":"R. Nascimento, B. Figueira, E. F. Neto, A. A. Rabelo, O. Fernandez, P. T. S. D. Luz, M. L. D. Costa","doi":"10.1590/0366-69132023693903436","DOIUrl":"https://doi.org/10.1590/0366-69132023693903436","url":null,"abstract":"It is described for the first time the synthesis and characterization of NiMn 2 O 4 employing the Mn ores from the Amazon Region as starting material, instead of using commercial reagents as normally occurs in its synthesis process. Initially, an Mn ore was transformed into a single product, the octahedral layer (OL) manganese oxide with Ni 2+ ions interlayer (Ni-OL-2), which was used as a matrix to obtain NiMn 2 O 4 by thermal decomposition. The following techniques were used for characterization: X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), infrared spectroscopy (FTIR), thermal analysis (TG-DTA), scanning (SEM) and transmission (TEM) electron microscopies. The results revealed that Mn oxide ore composed of nsutite mineral transformed into a well -ordered crystalline Ni-OL-2 phase, after the hydrothermal and cation exchange process. The thermal decomposition of Ni-OL-2 produced the nickel manganite phase at 850 °C with spherical ball morphology and crystal sizes in the range of 200-300 nm.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186712","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 : 2023-04-01DOI: 10.1590/0366-69132023693903404
M. Sellami, K. Zouaoui, B. Talbi, C. Mekki-Douadji, M. Berahal, F. Merabet, K. Ezziane
We report here the influence of the partial substitution of bismuth by calcium on the electric and magnetic properties of the Bi 1.56-x Ca x Sb 1.48 Co 0.96 O 7-δ solid solution. We used the ceramic method at 1000 °C in air. The difference in charge of the substitution cations causes an oxygen deficit to appear in the (Bi 1.56-x Ca x Co 0.44 )(Sb 1.48 Co 0.52 )O 7-δ pyrochlore formula. The starting compound Bi 1.56 Sb 1.48 Co 0.96 O 7 [17] has been used in photocatalysis for the degradation of rhodamine B [18]. The obtained results prompted us to synthesize this solid solution and see the influence of oxygen deficit on the degradation of rhodamine B. The photocatalysis applications are in progress and will be the subject of a future publication.
{"title":"Synthesis and physical properties of pyrochlore cobalt oxides Bi1.56-xCaxSb1.48Co0.96O7-δ","authors":"M. Sellami, K. Zouaoui, B. Talbi, C. Mekki-Douadji, M. Berahal, F. Merabet, K. Ezziane","doi":"10.1590/0366-69132023693903404","DOIUrl":"https://doi.org/10.1590/0366-69132023693903404","url":null,"abstract":"We report here the influence of the partial substitution of bismuth by calcium on the electric and magnetic properties of the Bi 1.56-x Ca x Sb 1.48 Co 0.96 O 7-δ solid solution. We used the ceramic method at 1000 °C in air. The difference in charge of the substitution cations causes an oxygen deficit to appear in the (Bi 1.56-x Ca x Co 0.44 )(Sb 1.48 Co 0.52 )O 7-δ pyrochlore formula. The starting compound Bi 1.56 Sb 1.48 Co 0.96 O 7 [17] has been used in photocatalysis for the degradation of rhodamine B [18]. The obtained results prompted us to synthesize this solid solution and see the influence of oxygen deficit on the degradation of rhodamine B. The photocatalysis applications are in progress and will be the subject of a future publication.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186276","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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