Pub Date : 2025-01-01DOI: 10.1016/j.bsecv.2024.12.001
Karina Salazar , Ángel Murciano , Pablo Velásquez , Piedad N. De Aza
In this study, 3D multilayer scaffolds were fabricated by sol–gel and polymeric replication methods. The principal objective was to fabricate scaffolds based on a core of Ca2SiO4/Ca2P6O17 (C2S/P6) to obtain mechanical resistance following by external layers with composition Ca2SiO4 (C2S) doped with several amount of SrCO3 (Sr = 0–2.5 wt%) to generate modulated bioactivity.
This scaffold was characterized from the physical, chemical and mineralogical point of view. Finally, the effect of the dopant on the surface morphology and how it affects the bioactivity was carried out according to the ISO 23317.2017 standard.
The obtained scaffolds exhibited an open porosity of 80–90% and a maximum mechanical strength of 1.2 ± 0.1 MPa. The scaffolds containing Sr2+ demonstrated bioactivity that could be modulated according to the Sr content. The results revealed that bioactivity occurred only when the scaffolds were coated with outer layers of strontium. Scaffolds doped with 1 and 1.5 wt% Sr displayed bioactivity after 3 days in simulated body fluid (SBF), while the 2.5 wt% Sr sample did not show bioactivity at any time.
{"title":"Obtaining characterization and in vitro behavior of 3D multilayer ceramic scaffolds Ca2SiO4/Ca2P6O17/Ca2SiO4-XSr","authors":"Karina Salazar , Ángel Murciano , Pablo Velásquez , Piedad N. De Aza","doi":"10.1016/j.bsecv.2024.12.001","DOIUrl":"10.1016/j.bsecv.2024.12.001","url":null,"abstract":"<div><div>In this study, 3D multilayer scaffolds were fabricated by sol–gel and polymeric replication methods. The principal objective was to fabricate scaffolds based on a core of Ca<sub>2</sub>SiO4/Ca<sub>2</sub>P<sub>6</sub>O<sub>17</sub> (C<sub>2</sub>S/P<sub>6</sub>) to obtain mechanical resistance following by external layers with composition Ca<sub>2</sub>SiO<sub>4</sub> (C<sub>2</sub>S) doped with several amount of SrCO<sub>3</sub> (Sr<!--> <!-->=<!--> <!-->0–2.5<!--> <!-->wt%) to generate modulated bioactivity.</div><div>This scaffold was characterized from the physical, chemical and mineralogical point of view. Finally, the effect of the dopant on the surface morphology and how it affects the bioactivity was carried out according to the ISO 23317.2017 standard.</div><div>The obtained scaffolds exhibited an open porosity of 80–90% and a maximum mechanical strength of 1.2<!--> <!-->±<!--> <!-->0.1<!--> <!-->MPa. The scaffolds containing Sr<sup>2+</sup> demonstrated bioactivity that could be modulated according to the Sr content. The results revealed that bioactivity occurred only when the scaffolds were coated with outer layers of strontium. Scaffolds doped with 1 and 1.5<!--> <!-->wt% Sr displayed bioactivity after 3 days in simulated body fluid (SBF), while the 2.5<!--> <!-->wt% Sr sample did not show bioactivity at any time.</div></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"64 1","pages":"Pages 57-68"},"PeriodicalIF":2.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.bsecv.2025.02.001
Amador C. Caballero
{"title":"Inteligencia artificial y materiales II","authors":"Amador C. Caballero","doi":"10.1016/j.bsecv.2025.02.001","DOIUrl":"10.1016/j.bsecv.2025.02.001","url":null,"abstract":"","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"64 1","pages":"Page 1"},"PeriodicalIF":2.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.bsecv.2024.09.004
Linda Viviana García-Quiñonez , Adolfo López-Liévano , Adolfo Collado-Hernández , Nora Elizondo-Villarreal , Eden Amaral Rodríguez-Castellanos , Guadalupe Alan Castillo-Rodríguez , Nayely Pineda-Aguilar , José Eduardo Terrazas-Rodríguez , Daniel Fernández-González , Cristian Gómez-Rodríguez
Selective laser sintering (SLS) is a novel additive manufacturing technique that has been recently applied to the sintering of powdered materials. In this work, radiation with laser was applied to a ceramic oxide powder blend to develop semi-transparent ceramic spheres. The powders bed consisted of different ceramics oxides which were irradiated with a continuous CO2 laser (λ = 10.6 μm) with a power density of 155 W/cm2, at both; static (punctually radiated) and non-static (dynamic) conditions. X-ray diffraction confirmed the presence of silicate phases, “gehlenite type”. Punctually radiated samples show semi-spheres with a completely sintered surface without visible cracks, however there were aggregates that did not fuse in the matrix. On the contrary, the use of dynamic radiation decreased the number of aggregates in the ceramic spheres, and a homogeneous sintered surface was obtained. Raman spectra show the introduction of the ceramic oxides into the silica matrix when the powder blend is punctually radiated with laser, while the dynamic parameters aid the crystallization of the silica matrix. Therefore, laser sintering using a continuous laser source with non-static radiation is a better alternative to produce semi-transparent ceramic spheres from a ceramic oxide powder bed with greater densification and better optical properties in transmittance–reflectance.
{"title":"Synthesis and characterization of semi-transparent gehlenite ceramic spheres obtained by selective laser sintering","authors":"Linda Viviana García-Quiñonez , Adolfo López-Liévano , Adolfo Collado-Hernández , Nora Elizondo-Villarreal , Eden Amaral Rodríguez-Castellanos , Guadalupe Alan Castillo-Rodríguez , Nayely Pineda-Aguilar , José Eduardo Terrazas-Rodríguez , Daniel Fernández-González , Cristian Gómez-Rodríguez","doi":"10.1016/j.bsecv.2024.09.004","DOIUrl":"10.1016/j.bsecv.2024.09.004","url":null,"abstract":"<div><div>Selective laser sintering (SLS) is a novel additive manufacturing technique that has been recently applied to the sintering of powdered materials. In this work, radiation with laser was applied to a ceramic oxide powder blend to develop semi-transparent ceramic spheres. The powders bed consisted of different ceramics oxides which were irradiated with a continuous CO<sub>2</sub> laser (<em>λ</em> <!-->=<!--> <!-->10.6<!--> <!-->μm) with a power density of 155<!--> <!-->W/cm<sup>2</sup>, at both; static (punctually radiated) and non-static (dynamic) conditions. X-ray diffraction confirmed the presence of silicate phases, “gehlenite type”. Punctually radiated samples show semi-spheres with a completely sintered surface without visible cracks, however there were aggregates that did not fuse in the matrix. On the contrary, the use of dynamic radiation decreased the number of aggregates in the ceramic spheres, and a homogeneous sintered surface was obtained. Raman spectra show the introduction of the ceramic oxides into the silica matrix when the powder blend is punctually radiated with laser, while the dynamic parameters aid the crystallization of the silica matrix. Therefore, laser sintering using a continuous laser source with non-static radiation is a better alternative to produce semi-transparent ceramic spheres from a ceramic oxide powder bed with greater densification and better optical properties in transmittance–reflectance.</div></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"64 1","pages":"Pages 21-32"},"PeriodicalIF":2.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.bsecv.2024.09.001
Camila I. Torres , Carlos P. Miquelarena , Gustavo L. Bianchi
In this current research endeavor, a comprehensive exploration into the properties of ceramic coatings has been undertaken, utilizing bauxite, talc, and kaolin clay. The primary focus lies in the meticulous analysis of the mechanical strength of ceramic proppants. The proppant raw material employed is kaolin clay, treated through a dry coating technique and subsequently sintered at 1300 °C. Evaluation of sample performance is based on the establishment of coating and substrate shrinkage. Shrinkage and density assessments are separately conducted for the coating mixtures and substrate. X-ray diffraction (XRD) is employed to discern the crystalline phases within the coatings, while structural characterization is facilitated through scanning electron microscopy (SEM) coupled with energy dispersive X-ray (EDX). Density and mechanical strength of proppants are meticulously investigated using picnometry and crush tests. The performances of the coated and uncoated samples were compared and investigated. Interestingly, the coated proppants demonstrate slightly higher density than their uncoated counterparts. Remarkably, the specimen featuring a coating composition of bauxite (72 wt%) + clay (25 wt%) + talc (3 wt%) yields optimal results for mechanical strength. The sole crystalline phase detected in the coating is mullite, with a minimum coating thickness of 10 μm.
{"title":"Optimization of ceramic proppant properties through an innovative coating approach","authors":"Camila I. Torres , Carlos P. Miquelarena , Gustavo L. Bianchi","doi":"10.1016/j.bsecv.2024.09.001","DOIUrl":"10.1016/j.bsecv.2024.09.001","url":null,"abstract":"<div><div>In this current research endeavor, a comprehensive exploration into the properties of ceramic coatings has been undertaken, utilizing bauxite, talc, and kaolin clay. The primary focus lies in the meticulous analysis of the mechanical strength of ceramic proppants. The proppant raw material employed is kaolin clay, treated through a dry coating technique and subsequently sintered at 1300<!--> <!-->°C. Evaluation of sample performance is based on the establishment of coating and substrate shrinkage. Shrinkage and density assessments are separately conducted for the coating mixtures and substrate. X-ray diffraction (XRD) is employed to discern the crystalline phases within the coatings, while structural characterization is facilitated through scanning electron microscopy (SEM) coupled with energy dispersive X-ray (EDX). Density and mechanical strength of proppants are meticulously investigated using picnometry and crush tests. The performances of the coated and uncoated samples were compared and investigated. Interestingly, the coated proppants demonstrate slightly higher density than their uncoated counterparts. Remarkably, the specimen featuring a coating composition of bauxite (72<!--> <!-->wt%)<!--> <!-->+<!--> <!-->clay (25<!--> <!-->wt%)<!--> <!-->+<!--> <!-->talc (3<!--> <!-->wt%) yields optimal results for mechanical strength. The sole crystalline phase detected in the coating is mullite, with a minimum coating thickness of 10<!--> <!-->μm.</div></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"64 1","pages":"Pages 2-11"},"PeriodicalIF":2.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.bsecv.2024.10.004
Jessica Gilabert, Eva María Díaz-Canales, Eulalia Zumaquero, M.a Fernanda Gazulla, Encarna Blasco, Mª Pilar Gómez-Tena
The synthesis progression of the crystalline silica polymorph tridymite has been investigated through the crystallization evolution using X-ray diffraction (XRD) technique. The impact of various synthesis variables on the crystallization of tridymite was examined, including the crystallinity of the raw material, the type and concentration of the mineralizer used, as well as the effect of the maximum furnace temperature and soaking time. The evolution of the crystal structure was analyzed using X-ray diffraction, and the best-synthesized final product was characterized by X-ray fluorescence, scanning electron microscopy and specific surface area. Due to the inherently sluggish nature of the tridymite transition, it was not possible to synthesize tridymite without the presence of an alkali in the composition. While all the variables studied influenced the synthesis of tridymite to some extent, the concentration and nature of the nucleation agent were identified as the key parameters to optimize the synthesis process. As a result of this research, a synthetic silica product with high crystalline tridymite phase content was successfully obtained, which could be deemed suitable for use as a secondary reference material in the quantification of crystalline silica, given the lack of reference materials for this kind of structure.
{"title":"Development of tridymite structure studied through crystal growth by X-ray diffraction: Influence of synthesis parameters","authors":"Jessica Gilabert, Eva María Díaz-Canales, Eulalia Zumaquero, M.a Fernanda Gazulla, Encarna Blasco, Mª Pilar Gómez-Tena","doi":"10.1016/j.bsecv.2024.10.004","DOIUrl":"10.1016/j.bsecv.2024.10.004","url":null,"abstract":"<div><div>The synthesis progression of the crystalline silica polymorph tridymite has been investigated through the crystallization evolution using X-ray diffraction (XRD) technique. The impact of various synthesis variables on the crystallization of tridymite was examined, including the crystallinity of the raw material, the type and concentration of the mineralizer used, as well as the effect of the maximum furnace temperature and soaking time. The evolution of the crystal structure was analyzed using X-ray diffraction, and the best-synthesized final product was characterized by X-ray fluorescence, scanning electron microscopy and specific surface area. Due to the inherently sluggish nature of the tridymite transition, it was not possible to synthesize tridymite without the presence of an alkali in the composition. While all the variables studied influenced the synthesis of tridymite to some extent, the concentration and nature of the nucleation agent were identified as the key parameters to optimize the synthesis process. As a result of this research, a synthetic silica product with high crystalline tridymite phase content was successfully obtained, which could be deemed suitable for use as a secondary reference material in the quantification of crystalline silica, given the lack of reference materials for this kind of structure.</div></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"64 1","pages":"Pages 45-56"},"PeriodicalIF":2.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.bsecv.2024.07.004
Julio E. Rodríguez López , Adam Sebastián Gutiérrez Martínez , Luis Carlos Moreno Aldana , Diego E. García Ospina
Using the solid reaction method, it was possible to prepare composites of /Ag (Ca349-Sr/Ag). Its transport properties were studied in the temperature range between 80K and 300K by measurements of Seebeck coefficient S(T), thermal conductivity κ(T) and electrical resistivity ρ(T). The thermoelectric performance was determined through the calculation of the power factor PF and the dimensionless merit figure ZT, these parameters reached maximum values close to 13 μW/K2-cm and 0.18, respectively. The observed increase in thermoelectric performance is the result of the combined effects of substitution of Sr by Ca and the addition of silver on the transport properties of composite. The results obtained make these structures promising materials to be used in the design of thermoelectric devices useful in applications at low temperatures.
{"title":"Compósitos de Ca349-Sr/Ag como material para aplicaciones termoeléctricas de baja temperatura","authors":"Julio E. Rodríguez López , Adam Sebastián Gutiérrez Martínez , Luis Carlos Moreno Aldana , Diego E. García Ospina","doi":"10.1016/j.bsecv.2024.07.004","DOIUrl":"10.1016/j.bsecv.2024.07.004","url":null,"abstract":"<div><div>Using the solid reaction method, it was possible to prepare composites of <span><math><mrow><mi>C</mi><msub><mi>a</mi><mrow><mn>2.95</mn></mrow></msub><mi>S</mi><msub><mi>r</mi><mrow><mn>0.05</mn></mrow></msub><mi>C</mi><msub><mi>o</mi><mn>4</mn></msub><msub><mi>O</mi><mrow><mn>9</mn><mo>+</mo><mi>δ</mi></mrow></msub></mrow></math></span> /Ag (Ca349-Sr/Ag). Its transport properties were studied in the temperature range between 80K and 300K by measurements of Seebeck coefficient S(T), thermal conductivity κ(T) and electrical resistivity ρ(T). The thermoelectric performance was determined through the calculation of the power factor PF and the dimensionless merit figure ZT, these parameters reached maximum values close to 13<!--> <!-->μW/K<sup>2</sup>-cm and 0.18, respectively. The observed increase in thermoelectric performance is the result of the combined effects of substitution of Sr by Ca and the addition of silver on the transport properties of composite. The results obtained make these structures promising materials to be used in the design of thermoelectric devices useful in applications at low temperatures.</div></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"64 1","pages":"Pages 12-20"},"PeriodicalIF":2.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.bsecv.2024.10.002
M.L. Puertas , J.F. Bartolomé , A. Esteban-Cubillo
In this research, a novel ethylene propylene diene monomer rubber (EPDM) formulation for cable with high ceramization efficiency was prepared by the addition of functionalized sepiolite with boron fluxing compound nanoparticles (SEPTB) obtained by precipitation route. Non-functionalized sepiolite (SEP) has been incorporated to the system for reference. EPDM materials were characterized by standardized tests measuring their behavior against fire and important improvements were observed, especially in terms of smoke production (25% reduction of the smoke production compared with the formulation using SEP) presenting a remarkable behaviour against dripping and self-extinction when a flame is directly applied. The mechanism of ceramization under fire conditions was discussed. It was found that EPDM system with SEPTB additive transformed into a rigid ceramic after treating at 1000 °C. In this particular case, the ceramization was more efficient due to the sepiolite transformation to enstatite at lower temperatures (∼750 vs ∼850 °C) combined with the “in situ” formation of a glassy phase which notably enhances the reinforcement of the char layer by forming a reinforcing 3D enstatite fibers net structure that reduces smoke production and even totally avoids the dripping of melted polymer by the action of the heat in a fire event. This work provides new insights for the preparation of high-performance synergist additive based on sepiolite for the enhancement of fire retardance of EPDM system for cable applications.
本研究采用沉淀法得到的硼助熔剂纳米颗粒（SEPTB）加入功能化海泡石，制备了一种新型的高陶化效率的三元乙丙橡胶（EPDM）电缆配方。非功能化海泡石（SEP）已纳入系统供参考。EPDM材料通过标准化测试来测量其防火性能，并观察到重要的改进，特别是在烟雾产生方面（与使用SEP的配方相比，烟雾产生减少25%），当火焰直接施加时，呈现出显着的防滴和自熄行为。探讨了火条件下陶瓷化的机理。结果表明，加入SEPTB的EPDM体系在1000℃热处理后转变为刚性陶瓷。在这种特殊情况下，由于海泡石在较低温度（~ 750 vs ~ 850°C）下转化为顽辉石，再加上玻璃相的“原位”形成，通过形成增强的3D顽辉石纤维网结构，显著增强了炭层的增强，减少了烟雾的产生，甚至完全避免了熔融聚合物在火灾事件中因热量的作用而滴下。本研究为制备基于海泡石的高性能增效剂添加剂以增强电缆用三元乙丙橡胶体系的阻燃性提供了新的见解。
{"title":"Synergistically ceramization of rubber system for fire safety cable by sepiolite functionalized with boron-based nanoparticles","authors":"M.L. Puertas , J.F. Bartolomé , A. Esteban-Cubillo","doi":"10.1016/j.bsecv.2024.10.002","DOIUrl":"10.1016/j.bsecv.2024.10.002","url":null,"abstract":"<div><div>In this research, a novel ethylene propylene diene monomer rubber (EPDM) formulation for cable with high ceramization efficiency was prepared by the addition of functionalized sepiolite with boron fluxing compound nanoparticles (SEPTB) obtained by precipitation route. Non-functionalized sepiolite (SEP) has been incorporated to the system for reference. EPDM materials were characterized by standardized tests measuring their behavior against fire and important improvements were observed, especially in terms of smoke production (25% reduction of the smoke production compared with the formulation using SEP) presenting a remarkable behaviour against dripping and self-extinction when a flame is directly applied. The mechanism of ceramization under fire conditions was discussed. It was found that EPDM system with SEPTB additive transformed into a rigid ceramic after treating at 1000<!--> <!-->°C. In this particular case, the ceramization was more efficient due to the sepiolite transformation to enstatite at lower temperatures (∼750 vs ∼850<!--> <!-->°C) combined with the “in situ” formation of a glassy phase which notably enhances the reinforcement of the char layer by forming a reinforcing 3D enstatite fibers net structure that reduces smoke production and even totally avoids the dripping of melted polymer by the action of the heat in a fire event. This work provides new insights for the preparation of high-performance synergist additive based on sepiolite for the enhancement of fire retardance of EPDM system for cable applications.</div></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"64 1","pages":"Pages 33-44"},"PeriodicalIF":2.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-01DOI: 10.1016/j.bsecv.2024.07.003
Pavel Ctibor , Libor Straka , František Lukáč , Josef Sedláček , Iva Králová
Commercial powders made of two copper oxides were compacted with spark plasma sintering (SPS). Their dielectric properties were studied in a broad range of frequencies and temperatures. Various relaxation phenomena were documented. DC resistivity was measured as well. Microstructure and phase composition were studied, and phase purity was shown for CuO, whereas Cu2O was more sensitive to carbon contamination during the SPS processing. Influence of the sintering temperature on microstructure and electrical properties was described for both materials. Change of DC resistivity induced by visible light irradiation was monitored for 48 h. The overall difference between CuO and Cu2O from the electrical standpoint was finally not so dramatic as the stoichiometry indicated. Both materials exhibited giant permittivity, but extremely dependent on frequency and temperature. Application could find such systems mainly in the branch of sensors.
{"title":"Copper oxides CuO and Cu2O processed by spark plasma sintering—Electrical characterization and photo-activated conductivity","authors":"Pavel Ctibor , Libor Straka , František Lukáč , Josef Sedláček , Iva Králová","doi":"10.1016/j.bsecv.2024.07.003","DOIUrl":"10.1016/j.bsecv.2024.07.003","url":null,"abstract":"<div><div>Commercial powders made of two copper oxides were compacted with spark plasma sintering (SPS). Their dielectric properties were studied in a broad range of frequencies and temperatures. Various relaxation phenomena were documented. DC resistivity was measured as well. Microstructure and phase composition were studied, and phase purity was shown for CuO, whereas Cu<sub>2</sub>O was more sensitive to carbon contamination during the SPS processing. Influence of the sintering temperature on microstructure and electrical properties was described for both materials. Change of DC resistivity induced by visible light irradiation was monitored for 48<!--> <!-->h. The overall difference between CuO and Cu<sub>2</sub>O from the electrical standpoint was finally not so dramatic as the stoichiometry indicated. Both materials exhibited giant permittivity, but extremely dependent on frequency and temperature. Application could find such systems mainly in the branch of sensors.</div></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"63 6","pages":"Pages 413-424"},"PeriodicalIF":2.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-01DOI: 10.1016/j.bsecv.2024.09.006
Manuel García-Heras , Alejandro Pinilla , Fernando Agua , Daniel Morales-Martín , Fátima Quijada , María Ángeles Villegas
An archaeometric study has been undertaken on a set of Fajalauza ceramic materials to in depth understand the technological characteristics and processing of one of the most unique productions of traditional Spanish ceramics. The set comprises a representative selection of fragments that encompass from the end of the Morisque period at the end of the fifteenth century to current productions of the twentieth and twenty first centuries. The fragments dated between the end of the fifteenth century and the middle of the nineteenth century come from recent preventive archaeological excavations carried out in different streets of Granada, while those from current productions come from both private collections and the current production of the Cecilio Morales factory. Clay samples from the old workshop of this factory were also analyzed for comparative purposes. The archaeometric characterization was accomplished using binocular magnifying glass, thin section petrographic observation, XRD, XRF and FESEM with EDS microanalyses. Chemical composition data were also subjected to a multivariate statistical analysis. The main results indicated a notable technological continuity between the seventeenth and twentieth centuries, detecting only discontinuities in the ceramics called Pre-Fajalauza, which differ in body composition and in glaze characteristics, and in the most recent ones of the twenty first century in which the SnO2 has been substituted by ZrO2 as opacifier in the glazes.
{"title":"Evolución tecnológica y arqueometría en el estudio de cerámicas de Fajalauza (Granada, España)","authors":"Manuel García-Heras , Alejandro Pinilla , Fernando Agua , Daniel Morales-Martín , Fátima Quijada , María Ángeles Villegas","doi":"10.1016/j.bsecv.2024.09.006","DOIUrl":"10.1016/j.bsecv.2024.09.006","url":null,"abstract":"<div><div>An archaeometric study has been undertaken on a set of Fajalauza ceramic materials to in depth understand the technological characteristics and processing of one of the most unique productions of traditional Spanish ceramics. The set comprises a representative selection of fragments that encompass from the end of the Morisque period at the end of the fifteenth century to current productions of the twentieth and twenty first centuries. The fragments dated between the end of the fifteenth century and the middle of the nineteenth century come from recent preventive archaeological excavations carried out in different streets of Granada, while those from current productions come from both private collections and the current production of the Cecilio Morales factory. Clay samples from the old workshop of this factory were also analyzed for comparative purposes. The archaeometric characterization was accomplished using binocular magnifying glass, thin section petrographic observation, XRD, XRF and FESEM with EDS microanalyses. Chemical composition data were also subjected to a multivariate statistical analysis. The main results indicated a notable technological continuity between the seventeenth and twentieth centuries, detecting only discontinuities in the ceramics called Pre-Fajalauza, which differ in body composition and in glaze characteristics, and in the most recent ones of the twenty first century in which the SnO<sub>2</sub> has been substituted by ZrO<sub>2</sub> as opacifier in the glazes.</div></div>","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"63 6","pages":"Pages 446-461"},"PeriodicalIF":2.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-01DOI: 10.1016/j.bsecv.2024.11.001
Amador C. Caballero
{"title":"Primeros trabajos del Congreso de la SECV","authors":"Amador C. Caballero","doi":"10.1016/j.bsecv.2024.11.001","DOIUrl":"10.1016/j.bsecv.2024.11.001","url":null,"abstract":"","PeriodicalId":56330,"journal":{"name":"Boletin de la Sociedad Espanola de Ceramica y Vidrio","volume":"63 6","pages":"Page 389"},"PeriodicalIF":2.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号