Pub Date : 2023-01-01DOI: 10.1590/0366-69132023693893389
J. Ady, S. Ariska, D. I. Rudyardjo, S. Anindriya
tricalcium phosphate with a rhombohedral crystal structure by utilizing natural limestone available in Indonesia. In several previous tricalcium phosphate studies using the sol-gel technique, the CaCO 3 compounds have been used as a precursor in the sol-gel route, but many studies use fabricated CaCO 3 compounds with varying levels of purity. Meanwhile, the use of CaCO 3 compounds from natural materials is rarely carried out in similar studies. Therefore, the novelty of this study is related to: 1) the use of a novel CaCO 3 material as a precursor in the sol-gel route for the sample preparation of tricalcium phosphate derived from the mineral limestone (natural raw material) in the Lumajang region, East Java, Indonesia; 2) this research study focused on the microstructure of tricalcium phosphate in the rhombohedral crystal system which is a family of hexagonal crystal structure with the level of stability of the crystal structure affected by heating temperature; and 3) the search for the potential use of the novel materials of CaCO 3 as an artificial bone bioceramic derived by a limestone mineral in Lumajang with the rhombohedral system crystal characteristics. In this focus, the rhombohedral tricalcium phosphate was prepared from limestone (CaCO 3 ) that was obtained from nature in the Lumajang district, with the use
{"title":"Study of rhombohedral tricalcium phosphate in hexagonal crystal structure family on the sample prepared by the sol-gel route and the effect of calcination temperature","authors":"J. Ady, S. Ariska, D. I. Rudyardjo, S. Anindriya","doi":"10.1590/0366-69132023693893389","DOIUrl":"https://doi.org/10.1590/0366-69132023693893389","url":null,"abstract":"tricalcium phosphate with a rhombohedral crystal structure by utilizing natural limestone available in Indonesia. In several previous tricalcium phosphate studies using the sol-gel technique, the CaCO 3 compounds have been used as a precursor in the sol-gel route, but many studies use fabricated CaCO 3 compounds with varying levels of purity. Meanwhile, the use of CaCO 3 compounds from natural materials is rarely carried out in similar studies. Therefore, the novelty of this study is related to: 1) the use of a novel CaCO 3 material as a precursor in the sol-gel route for the sample preparation of tricalcium phosphate derived from the mineral limestone (natural raw material) in the Lumajang region, East Java, Indonesia; 2) this research study focused on the microstructure of tricalcium phosphate in the rhombohedral crystal system which is a family of hexagonal crystal structure with the level of stability of the crystal structure affected by heating temperature; and 3) the search for the potential use of the novel materials of CaCO 3 as an artificial bone bioceramic derived by a limestone mineral in Lumajang with the rhombohedral system crystal characteristics. In this focus, the rhombohedral tricalcium phosphate was prepared from limestone (CaCO 3 ) that was obtained from nature in the Lumajang district, with the use","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186389","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 : 2023-01-01DOI: 10.1590/0366-69132023693893391
Enobong R. Essien, D. Nwude, V. Okolie, L. Adams
A glass-ceramic in the SiO 2 -K 2 O-CaO-P 2 O 5 quaternary system was prepared by substituting the Na 2 O component with K 2 O to avoid Na 2 Ca 2 Si 3 O 9 formation upon thermal treatment since this phase decreases apatite formation kinetics on glass material. To form the glass-ceramic, a modified sol-gel method involving solution precipitation, followed by reagents encapsulation in citric acid was adopted to enable the use of sodium metasilicate as a cheap substitute for traditional alkoxysilane silica precursors. The foam replication method using polyurethane foam as a sacrificial template was used to obtain the scaffold, which on analysis gave a porosity of 92% and an average pore size of 36±6 m m. In vitro bioactivity evaluation in simulated body fluid for a maximum of 14 days indicated the formation of hydroxyapatite on the sample surface. Phase analysis showed that CaSiO 3 and K 2 CaSiO 4 crystals formed in the sintered sample as the main phases, which exhibited biodegradability in simulated body fluid (SBF). Therefore, economically-derived porous bioactive glass-ceramic scaffolds based on the current method (a simple process) are feasible.
{"title":"Bioactive SiO2-K2O-CaO-P2O5 glass-ceramic scaffold prepared using polyurethane foam template","authors":"Enobong R. Essien, D. Nwude, V. Okolie, L. Adams","doi":"10.1590/0366-69132023693893391","DOIUrl":"https://doi.org/10.1590/0366-69132023693893391","url":null,"abstract":"A glass-ceramic in the SiO 2 -K 2 O-CaO-P 2 O 5 quaternary system was prepared by substituting the Na 2 O component with K 2 O to avoid Na 2 Ca 2 Si 3 O 9 formation upon thermal treatment since this phase decreases apatite formation kinetics on glass material. To form the glass-ceramic, a modified sol-gel method involving solution precipitation, followed by reagents encapsulation in citric acid was adopted to enable the use of sodium metasilicate as a cheap substitute for traditional alkoxysilane silica precursors. The foam replication method using polyurethane foam as a sacrificial template was used to obtain the scaffold, which on analysis gave a porosity of 92% and an average pore size of 36±6 m m. In vitro bioactivity evaluation in simulated body fluid for a maximum of 14 days indicated the formation of hydroxyapatite on the sample surface. Phase analysis showed that CaSiO 3 and K 2 CaSiO 4 crystals formed in the sintered sample as the main phases, which exhibited biodegradability in simulated body fluid (SBF). Therefore, economically-derived porous bioactive glass-ceramic scaffolds based on the current method (a simple process) are feasible.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186455","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 : 2023-01-01DOI: 10.1590/0366-69132023693893411
E. C. Campos, D. H. Chaves, C. M. F. Santos, S. Rocha, V. Birchal
Two different reactive concentrated magnesium hydroxide (HM) pulps, produced in a lab reactor mill, and a synthetic and non-reactive HM-pulp, for comparative analyses, have been prepared and studied. Sodium polyacrylate was selected as a dispersant for improving the HM pulp fluidity, with concentrations varying from 0.42% to 2.0% on a dry basis. The two reactive pulps differed from each other mainly by the impurity level and for both, a residual MgO amount was detected, implying that the hydration reaction could proceed. Results (with and without dispersant) confirmed the formation of particle clusters as HM concentration rose until a critical value, above which the pulp behaved as a solid. Reactive HM-pulps with high impurities may represent a limiting factor in the drying operation. Among all HM-pulps studied, the purest reactive pulp with 1% dispersant presented the best flow behavior making this reactive pulp the most suitable to be tested in a pilot spray dryer.
{"title":"Sedimentation and rheological behavior of reactive and non-reactive magnesium hydroxide pulps for industrial spray dryer processing","authors":"E. C. Campos, D. H. Chaves, C. M. F. Santos, S. Rocha, V. Birchal","doi":"10.1590/0366-69132023693893411","DOIUrl":"https://doi.org/10.1590/0366-69132023693893411","url":null,"abstract":"Two different reactive concentrated magnesium hydroxide (HM) pulps, produced in a lab reactor mill, and a synthetic and non-reactive HM-pulp, for comparative analyses, have been prepared and studied. Sodium polyacrylate was selected as a dispersant for improving the HM pulp fluidity, with concentrations varying from 0.42% to 2.0% on a dry basis. The two reactive pulps differed from each other mainly by the impurity level and for both, a residual MgO amount was detected, implying that the hydration reaction could proceed. Results (with and without dispersant) confirmed the formation of particle clusters as HM concentration rose until a critical value, above which the pulp behaved as a solid. Reactive HM-pulps with high impurities may represent a limiting factor in the drying operation. Among all HM-pulps studied, the purest reactive pulp with 1% dispersant presented the best flow behavior making this reactive pulp the most suitable to be tested in a pilot spray dryer.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186547","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 : 2023-01-01DOI: 10.1590/0366-69132023693893308
A. Rodrigues, S. Bragança
The global interest in an increasingly sustainable economy, with a reduction in the consumption of raw materials and energy, can be supported by the growth in the use of lightweight concrete (LC) produced with expanded-clay aggregates (EA). The main qualities of natural self-bloating clay for the production of EA were studied, analyzing the parameters that determine the expansion during firing, which influence EA size, mechanical strength, density, and water absorption. After this step, the production and characterization of the LC were carried out. EA characteristics showed a strong influence on the mechanical strength and the main technological properties of the LC. The results pointed out the necessary attributes that clay (and EA) must have for LC production. These attributes can also be achieved by mixing different clays (blend type), which can enhance the production and use of LC with EA worldwide.
{"title":"Technological properties of a self-bloating clay and expanded-clay aggregate for the production of lightweight concrete","authors":"A. Rodrigues, S. Bragança","doi":"10.1590/0366-69132023693893308","DOIUrl":"https://doi.org/10.1590/0366-69132023693893308","url":null,"abstract":"The global interest in an increasingly sustainable economy, with a reduction in the consumption of raw materials and energy, can be supported by the growth in the use of lightweight concrete (LC) produced with expanded-clay aggregates (EA). The main qualities of natural self-bloating clay for the production of EA were studied, analyzing the parameters that determine the expansion during firing, which influence EA size, mechanical strength, density, and water absorption. After this step, the production and characterization of the LC were carried out. EA characteristics showed a strong influence on the mechanical strength and the main technological properties of the LC. The results pointed out the necessary attributes that clay (and EA) must have for LC production. These attributes can also be achieved by mixing different clays (blend type), which can enhance the production and use of LC with EA worldwide.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186597","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 : 2023-01-01DOI: 10.1590/0366-69132023693893380
M. C. Viegas, G. P. Figueredo, S. F. Rodrigues, A. Cabral, M. A. Castro, M. M. Oliveira
CuCrO 2 was synthesized by solution combustion synthesis (SCS) and applied as a heterogeneous catalyst to produce soybean biodiesel. The combustion reaction was carried out using urea as a fuel, and copper (II) and chromium (III) nitrates as precursors. After the powders’ obtention, these were calcined and functionalized in an acidic medium. The powders were characterized by thermogravimetry (TG), X-ray diffraction (XRD), scanning electron microscopy (SEM), and infrared spectroscopy (IR) techniques. The TG curve revealed that the formation of the CuCrO 2 in the combustion reaction remained stable up to 1000 °C. The XRD results confirmed the formation of the CuCrO 2 compound. The SEM images showed that the crystallinity of the samples increased after the calcination process. The IR spectra showed the presence of delafossite characteristic bands. After the transesterification reaction, biodiesel was obtained with a yield of around 80%. Thus, catalysts based on delafossite synthesized through the combustion method and functionalized showed to be promising for the transesterification reaction of vegetable oils.
{"title":"Synthesis of delafossite CuCrO2 via solution combustion method and its acid functionalization for biodiesel production","authors":"M. C. Viegas, G. P. Figueredo, S. F. Rodrigues, A. Cabral, M. A. Castro, M. M. Oliveira","doi":"10.1590/0366-69132023693893380","DOIUrl":"https://doi.org/10.1590/0366-69132023693893380","url":null,"abstract":"CuCrO 2 was synthesized by solution combustion synthesis (SCS) and applied as a heterogeneous catalyst to produce soybean biodiesel. The combustion reaction was carried out using urea as a fuel, and copper (II) and chromium (III) nitrates as precursors. After the powders’ obtention, these were calcined and functionalized in an acidic medium. The powders were characterized by thermogravimetry (TG), X-ray diffraction (XRD), scanning electron microscopy (SEM), and infrared spectroscopy (IR) techniques. The TG curve revealed that the formation of the CuCrO 2 in the combustion reaction remained stable up to 1000 °C. The XRD results confirmed the formation of the CuCrO 2 compound. The SEM images showed that the crystallinity of the samples increased after the calcination process. The IR spectra showed the presence of delafossite characteristic bands. After the transesterification reaction, biodiesel was obtained with a yield of around 80%. Thus, catalysts based on delafossite synthesized through the combustion method and functionalized showed to be promising for the transesterification reaction of vegetable oils.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186207","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 : 2023-01-01DOI: 10.1590/0366-69132023693893377
V. Coelho, F. G. Silva
Mortar coatings have a major influence on a building’s aesthetics, valorization, and habitability, with significant effects on the mechanical behavior of masonry walls. Multiple types of meshes can be embedded in plaster to enhance both masonry and coating’s mechanical behavior, restrain crack formation, enhance the bonding between layers
{"title":"Mesh reinforcement in masonry mortar coatings: a systematic literature review","authors":"V. Coelho, F. G. Silva","doi":"10.1590/0366-69132023693893377","DOIUrl":"https://doi.org/10.1590/0366-69132023693893377","url":null,"abstract":"Mortar coatings have a major influence on a building’s aesthetics, valorization, and habitability, with significant effects on the mechanical behavior of masonry walls. Multiple types of meshes can be embedded in plaster to enhance both masonry and coating’s mechanical behavior, restrain crack formation, enhance the bonding between layers","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186661","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 : 2023-01-01DOI: 10.1590/0366-69132023693893425
J. C. Carvalho, G. F. Bispo, T. S. Lilge, C. S. Bezerra, A. B. Andrade, Z. S. Macedo, M. Valerio
The effect of synthesis parameters on the microstructural behavior and morphology during the yttrium oxide (Y 2 O 3 ) formation is reported. Y 2 O 3 crystals were produced by a modified sol-gel route assisted by polyvinyl alcohol solution varying the calcination temperature and solution pH. The crystalline phase formation was investigated using X-ray powder diffraction combined with the Rietveld refinement method. The microstructural properties were analyzed by using the Williamson-Hall formalism. The calcination temperature followed the thermal events observed in the differential thermal analysis combined with the thermogravimetric analysis of the precursor xerogel. It was seen that the combination of PVA and pH variation can be used to minimize the calcination time and temperature. The morphological analysis showed samples with different sizes and appearances depending on pH and calcination temperature. Therefore, it was shown that the parameters in the synthesis process can be used to tailor the properties of Y 2 O 3 , such as crystallite size, degree of structural ordering, and morphology, and consequently, improve the desired application.
{"title":"Tailoring the properties of Y2O3 via synthesis parameters varied during the PVA-assisted sol-gel route","authors":"J. C. Carvalho, G. F. Bispo, T. S. Lilge, C. S. Bezerra, A. B. Andrade, Z. S. Macedo, M. Valerio","doi":"10.1590/0366-69132023693893425","DOIUrl":"https://doi.org/10.1590/0366-69132023693893425","url":null,"abstract":"The effect of synthesis parameters on the microstructural behavior and morphology during the yttrium oxide (Y 2 O 3 ) formation is reported. Y 2 O 3 crystals were produced by a modified sol-gel route assisted by polyvinyl alcohol solution varying the calcination temperature and solution pH. The crystalline phase formation was investigated using X-ray powder diffraction combined with the Rietveld refinement method. The microstructural properties were analyzed by using the Williamson-Hall formalism. The calcination temperature followed the thermal events observed in the differential thermal analysis combined with the thermogravimetric analysis of the precursor xerogel. It was seen that the combination of PVA and pH variation can be used to minimize the calcination time and temperature. The morphological analysis showed samples with different sizes and appearances depending on pH and calcination temperature. Therefore, it was shown that the parameters in the synthesis process can be used to tailor the properties of Y 2 O 3 , such as crystallite size, degree of structural ordering, and morphology, and consequently, improve the desired application.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48681166","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 : 2023-01-01DOI: 10.1590/0366-69132023693893383
V. F. Nunes, F. M. Lima, E. S. Teixeira, P. H. F. Maia Junior, A. Almeida, F. Freire
For oxide semiconductors for application in dye-sensitized solar cells (DSSCs), titanium dioxide conjugated with zinc oxide thin films was synthesized and characterized. The UV (ultraviolet) spectrum characterization showed a peak of absorbance at around 355 nm, with a band gap of 3.25 eV and reflectance around 85%. Such characteristics allowed the fabrication of DSSCs with N719 dye, under simulated light of 100 mW/cm 2 . The highest efficiency of 1.17% was at 5% titanium dioxide and 4 h of dye immersion.
{"title":"Synthesis of TiO2/ZnO photoanodes on FTO conductive glass for photovoltaic applications","authors":"V. F. Nunes, F. M. Lima, E. S. Teixeira, P. H. F. Maia Junior, A. Almeida, F. Freire","doi":"10.1590/0366-69132023693893383","DOIUrl":"https://doi.org/10.1590/0366-69132023693893383","url":null,"abstract":"For oxide semiconductors for application in dye-sensitized solar cells (DSSCs), titanium dioxide conjugated with zinc oxide thin films was synthesized and characterized. The UV (ultraviolet) spectrum characterization showed a peak of absorbance at around 355 nm, with a band gap of 3.25 eV and reflectance around 85%. Such characteristics allowed the fabrication of DSSCs with N719 dye, under simulated light of 100 mW/cm 2 . The highest efficiency of 1.17% was at 5% titanium dioxide and 4 h of dye immersion.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67186304","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 : 2023-01-01DOI: 10.1590/0366-69132023693893382
A. Prado, R. M. Feitosa, M. A. Neves, S. P. Taguchi
This study analyzed how the compositional variability of dimension stone residues influences the characteristics of rustic porous ceramic tiles. The specimens were prepared by adding 20 wt% of dimension stone residue to the clay and sintered at 1000 °C for 1 h. The testing assays performed were physical properties and structural analysis through scanning electron microscopy. The results indicate that water absorption was lower (~9% to 14%) in samples containing silicate residues compared to carbonate residues (~16%). Apparent porosity of ~21% to 25% and shrinkage of 0.5% to 1.6% were measured in silicate samples while higher apparent porosity of ~30% and expansion of -0.04% were found in carbonate samples. Flexural strength and modulus of rupture were similar, ~16 MPa and ~330 N, respectively, for both sample sets. The samples containing silicate residues whose SiO 2 content was between 48% and 58% and the sum of alkaline and alkaline earth oxides was less than 18% were suitable for manufacturing rustic porous ceramic tile, while residues with high SiO 2 or carbonate contents impaired the properties of the ceramic bodies. Therefore, it is recommended that the dimension stone residues intended for use in ceramic tiles be previously separated according to chemical and mineralogical characteristics.
{"title":"The influence of compositional variability of dimension stone residues on the properties of rustic porous ceramic tiles","authors":"A. Prado, R. M. Feitosa, M. A. Neves, S. P. Taguchi","doi":"10.1590/0366-69132023693893382","DOIUrl":"https://doi.org/10.1590/0366-69132023693893382","url":null,"abstract":"This study analyzed how the compositional variability of dimension stone residues influences the characteristics of rustic porous ceramic tiles. The specimens were prepared by adding 20 wt% of dimension stone residue to the clay and sintered at 1000 °C for 1 h. The testing assays performed were physical properties and structural analysis through scanning electron microscopy. The results indicate that water absorption was lower (~9% to 14%) in samples containing silicate residues compared to carbonate residues (~16%). Apparent porosity of ~21% to 25% and shrinkage of 0.5% to 1.6% were measured in silicate samples while higher apparent porosity of ~30% and expansion of -0.04% were found in carbonate samples. Flexural strength and modulus of rupture were similar, ~16 MPa and ~330 N, respectively, for both sample sets. The samples containing silicate residues whose SiO 2 content was between 48% and 58% and the sum of alkaline and alkaline earth oxides was less than 18% were suitable for manufacturing rustic porous ceramic tile, while residues with high SiO 2 or carbonate contents impaired the properties of the ceramic bodies. Therefore, it is recommended that the dimension stone residues intended for use in ceramic tiles be previously separated according to chemical and mineralogical characteristics.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47198480","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 : 2023-01-01DOI: 10.1590/0366-69132023693893379
W. T. Barbosa, C. M. Álvarez-Docio, R. García-Carrodeguas, M. Fook, M. A. Rodríguez, R. E. Rojas-Hernandez
The photoluminescent behavior of Eu-doped Sr 3 Al 2 O 6 obtained by highly efficient solution combustion synthesis is reported. In order to understand the influence of the fuel on the synthesis, the stoichiometric quantity and an excess of fuel were evaluated. By adjusting the amount of fuel, different luminescence responses were obtained, allowing europium cations incorporation into the Sr 3 Al 2 O 6 lattice to serve as effective luminescence activators in such a short time during the rapid combustion synthesis process. The higher amount of fuel in the presence of the oxidizing agent produced Sr 3 Al 2 O 6 :Eu particles with higher phosphorescence brightness, owing to the increase of the reduction process from Eu 3+ to Eu 2+ . The synthesized phosphor showed an intense band emission centered at 515 nm and could be excited over a broad spectral range in the UV-visible region. Particles having nanostructured flake-type morphology were obtained, which was considered a micro-nanofunctional candidate for practical applications.
{"title":"Impact of fuel quantity on luminescence properties of Sr3Al2O6:Eu by combustion synthesis","authors":"W. T. Barbosa, C. M. Álvarez-Docio, R. García-Carrodeguas, M. Fook, M. A. Rodríguez, R. E. Rojas-Hernandez","doi":"10.1590/0366-69132023693893379","DOIUrl":"https://doi.org/10.1590/0366-69132023693893379","url":null,"abstract":"The photoluminescent behavior of Eu-doped Sr 3 Al 2 O 6 obtained by highly efficient solution combustion synthesis is reported. In order to understand the influence of the fuel on the synthesis, the stoichiometric quantity and an excess of fuel were evaluated. By adjusting the amount of fuel, different luminescence responses were obtained, allowing europium cations incorporation into the Sr 3 Al 2 O 6 lattice to serve as effective luminescence activators in such a short time during the rapid combustion synthesis process. The higher amount of fuel in the presence of the oxidizing agent produced Sr 3 Al 2 O 6 :Eu particles with higher phosphorescence brightness, owing to the increase of the reduction process from Eu 3+ to Eu 2+ . The synthesized phosphor showed an intense band emission centered at 515 nm and could be excited over a broad spectral range in the UV-visible region. Particles having nanostructured flake-type morphology were obtained, which was considered a micro-nanofunctional candidate for practical applications.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47226866","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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