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Microstructure modulation of a Bi4Ti3O12 thin film system by combining the effect of a simple processing methodology with a co-doping strategy involving Nd3+ and Nb5+ 通过将简单加工方法的效果与 Nd3+ 和 Nb5+ 共掺杂策略相结合来调节 Bi4Ti3O12 薄膜体系的微观结构
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-11-01 DOI: 10.1016/j.bsecv.2024.09.002
Carlos Gumiel , María Colado , David G. Calatayud , Rafael Barea , Marina Villegas , Teresa Jardiel
A microstructure based on plate-like grains is expected in the obtaining of Bi4Ti3O12 ferroelectric ceramics, promoted by the Aurivillius crystalline structure that this material exhibit. This grain morphology would lead to conductivity making the functional response unpractical. In this frame, we address the control of the crystal growth which leads to this grain morphology by combining the effect of a simple thin film obtaining procedure with doping strategies. On the one hand, an aqueous solution-gel plus spin-coating methodology is performed here for the obtaining of these thin films. On the other hand, a simultaneous incorporation of Nd3+ and Nb5+ in the crystal lattice replacing Bi3+ and Ti4+, respectively, is conducted in this contribution. The results obtained by X-ray diffraction, UV–visible measurements and FESEM confirm that the incorporated dopants are able to block (or at least control) the mentioned crystal growth.
由于 Bi4Ti3O12 铁电陶瓷具有奥里维利乌斯晶体结构,因此在获得这种材料时,预计会出现基于板状晶粒的微观结构。这种晶粒形态会导致导电性,使功能响应变得不切实际。在此框架下,我们通过将简单的薄膜获取程序与掺杂策略相结合,解决了导致这种晶粒形态的晶体生长控制问题。一方面,我们采用水溶液-凝胶加旋涂的方法来获得这些薄膜。另一方面,本文在晶格中同时掺入了 Nd3+ 和 Nb5+,分别取代了 Bi3+ 和 Ti4+。通过 X 射线衍射、紫外可见光测量和 FESEM 得出的结果证实,加入的掺杂剂能够阻止(或至少控制)上述晶体生长。
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引用次数: 0
In vitro evaluation of a new endodontic cement based on calcium and strontium aluminate 基于铝酸钙和铝酸锶的新型牙髓胶结物的体外评估
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-11-01 DOI: 10.1016/j.bsecv.2024.06.004
Willams Teles Barbosa , Imarally Vitor de Souza Ribeiro Nascimento , Daniel Bezerra Lima , Francivandi Coelho Barbosa , Benjamin S. Lazarus , Josiane Dantas Viana Barbosa , Marcus Vinicius Lia Fook , Raúl Garcia Carrodeguas , Miguel Ángel Rodriguez
Aluminate-based endodontic cements are promising in root canal treatments. Calcium aluminates have been used as bone and dental fillers, due to their fast setting time, good workability, and biocompatibility, overcoming some of the disadvantages of mineral trioxide aggregate (MTA) currently available. Similarly, strontium aluminates are of interest, due to their potential as hydraulic cement. They have greater radiopacity than their calcium counterparts and the potential to promote osteoblast differentiation which favors bone regeneration. The present study evaluates the in vitro biological properties of the new endodontic cement CS5C (80/20 wt.% of S3A (tri-strontium aluminate (Sr3Al2O6)) and C12A7 (dodeca-calcium hepta-aluminate (Ca12Al14O33))). The in vitro ion release tests showed that Al3+, Ca2+, and Sr2+ ions are responsible for the alkaline pH of the medium, promoting antimicrobial activity against all bacterial strains tested. It also showed biocompatible properties, with promising cellular adhesion and proliferation in vitro. The results revealed that CS5S cement has strong potential for future applications as endodontic cement.
在根管治疗中,以铝酸盐为基础的根管水门汀具有广阔的前景。铝酸钙具有凝固时间快、可加工性好和生物相容性好等优点,克服了目前可用的三氧化物矿物骨料(MTA)的一些缺点,因此已被用作骨和牙科填充物。同样,铝酸锶也因其作为水门汀的潜力而备受关注。与钙质骨料相比,铝酸锶具有更高的放射性和促进成骨细胞分化的潜力,有利于骨再生。本研究评估了新型牙髓水门汀 CS5C(S3A(三锶铝酸盐(Sr3Al2O6))和 C12A7(十二碳七铝酸钙(Ca12Al14O33))的重量百分比为 80/20)的体外生物特性。体外离子释放测试表明,Al3+、Ca2+ 和 Sr2+ 离子是造成培养基 pH 值偏碱性的原因,从而促进了对所有受测细菌菌株的抗菌活性。它还具有生物相容性,在体外具有良好的细胞粘附性和增殖性。研究结果表明,CS5S 骨水泥在未来作为牙髓骨水泥的应用中具有很大的潜力。
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引用次数: 0
Exploring the diversity of clays: Impacts of temperature on physicochemical changes, mechanical characteristics, and permeability, and their relevance to membrane applications 探索粘土的多样性:温度对物理化学变化、机械特性和渗透性的影响及其与膜应用的相关性
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-11-01 DOI: 10.1016/j.bsecv.2024.07.001
Khadija Elataoui , Mohamed Amine Harech , Hajar Qobay , Noureddine Elbinna , Hakima Aouad , Mohamed Waqif , Latifa Saadi
This study investigates the characterization of two clays obtained from the Safi and Fez regions, focusing on their analysis for filtration membrane applications. Various analytical techniques were employed, including chemical composition analysis, elemental analysis, mineralogical characterization, carbonate content determination, color assessment, plasticity evaluation, thermal treatment analysis (DTA-TG), mineralogical transformation study, fusion tests, membrane tests, and scanning electron microscopy (SEM).
The results reveal significant differences between the two clays regarding their chemical composition. The red clay exhibits a mineralogical composition comprising quartz, calcite, dolomite, hematite, illite, and kaolinite, whereas the gray clay contains quartz, calcite, dolomite, illite, talc, and montmorillonite. Furthermore, upon thermal treatment, both clays exhibit changes in their physical properties.
Despite the decrease in porosity and water absorption, as well as the increase in compression strength for both clays, the permeability of the grey clay increases, unlike the red clay, which exhibits a constant permeability beyond 1000 °C.
These findings highlight the diversity and industrial significance of clays from the Safi and Fez regions for filtration membrane applications. The contrasting properties of red and gray clays provide insights into their potential utilization in different industries. Exploring these clays’ behavior can lead to better filtration membranes and new industrial applications.
本研究调查了从萨菲和非斯地区获得的两种粘土的特性,重点分析了它们在过滤膜应用方面的特性。研究采用了多种分析技术,包括化学成分分析、元素分析、矿物学表征、碳酸盐含量测定、颜色评估、可塑性评估、热处理分析(DTA-TG)、矿物学转化研究、熔融试验、膜试验和扫描电子显微镜(SEM)。红色粘土的矿物成分包括石英、方解石、白云石、赤铁矿、伊利石和高岭石,而灰色粘土则含有石英、方解石、白云石、伊利石、滑石和蒙脱石。此外,经过热处理后,两种粘土的物理性质都发生了变化。尽管两种粘土的孔隙率和吸水率都有所下降,压缩强度也有所提高,但灰色粘土的渗透性却增加了,这与红粘土不同,后者的渗透性在 1000 °C 以上保持不变。红粘土和灰粘土截然不同的特性为它们在不同行业的潜在应用提供了启示。对这些粘土行为的探索将带来更好的过滤膜和新的工业应用。
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引用次数: 0
Study of the interaction between low density polyethylene and TiO2 in different environments. Influence of the presence and absence of radiation, and of the atmosphere (O2, N2 or Ar) 研究低密度聚乙烯和二氧化钛在不同环境中的相互作用。有无辐射以及大气(O2、N2 或 Ar)的影响
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-11-01 DOI: 10.1016/j.bsecv.2024.09.005
Ana Castellanos-Aliaga , Laura San-Miguel , Marina Villegas , Ángel Caballero , Marco Peiteado , David González Calatayud
In the process of photocatalytic degradation of plastics, the surface interaction between the plastic material and the photocatalyst results crucial. The present work focuses on using a specific TiO2 photocatalytic semiconductor whose hierarchical structure favours the interaction with low density polyethylene (LDPE), a key component in plastics. An exhaustive study of the nature of this interaction is conducted, analysing the influence of the atmosphere and radiation. The results obtained indicate that the observed interaction can be modulated by controlling the atmosphere, evolving into a degradation process whose mechanism also depends on the absence or the presence of light. This point is particularly relevant as it highlights the dual nature of TiO2 as both photocatalyst and catalyst.
在光催化降解塑料的过程中,塑料材料与光催化剂之间的表面相互作用至关重要。本研究的重点是使用一种特定的二氧化钛光催化半导体,这种半导体的分层结构有利于与塑料的主要成分低密度聚乙烯(LDPE)发生相互作用。对这种相互作用的性质进行了详尽的研究,分析了大气和辐射的影响。研究结果表明,所观察到的相互作用可以通过控制大气来调节,并演变成一种降解过程,其机理也取决于光的存在与否。这一点尤为重要,因为它突出了二氧化钛作为光催化剂和催化剂的双重性质。
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引用次数: 0
Low-temperature sintering of ceramic bricks from clay, waste glass and sand 用粘土、废玻璃和沙子低温烧结陶瓷砖
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-09-01 DOI: 10.1016/j.bsecv.2024.06.003
Mario Flores Nicolás , Marcos M. Chávez , Marina Vlasova , Teresa Pi Puig
In the present work, bricks were made on a real 1:1 scale for the construction of housing. For the preparation of the mixtures, raw materials such as clay, sand and glass obtained from the recycling of brown beer containers were used, applying the method plastic molding for the preparation of the semi-products. It has been established that the addition of sand containing a small amount of montmorillonite to such clay enabled to realization of plastic molding. The incorporation of glass into the clay provided to substantially reduce the sintering time of the bricks up to 8 h and to vary their strength properties. Sintering was carried out at 800 °C in an air atmosphere. The results of X-ray diffraction (XRD), X-ray fluorescence (XRF) and field emission scanning electron microscopy (FESEM) and EDS microanalysis have shown that the raw materials and ceramic bricks contains quartz and feldspars. Low-temperature sintering has made it possible to obtain high-quality, high-strength building bricks in accordance with standards.
在本作品中,砖块是按照 1:1 的真实比例制作的,用于建造住房。在制备混合物时,使用了从回收的棕色啤酒容器中获得的粘土、沙子和玻璃等原材料,并采用塑料成型法制备半成品。已经证实,在这种粘土中加入含有少量蒙脱石的沙子可以实现塑性成型。在粘土中加入玻璃可大大缩短砖块的烧结时间,最长可达 8 小时,并可改变其强度特性。烧结是在 800 °C 的空气环境中进行的。X 射线衍射(XRD)、X 射线荧光(XRF)、场发射扫描电子显微镜(FESEM)和 EDS 显微分析的结果表明,原材料和陶瓷砖含有石英和长石。低温烧结使获得符合标准的高质量、高强度建筑用砖成为可能。
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引用次数: 0
On the use of Afyon clay in Ukrainian clay-free compositions for porcelain tile manufacture 在乌克兰无粘土成分瓷片生产中使用阿菲永粘土
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-09-01 DOI: 10.1016/j.bsecv.2024.05.002
The conflict in Ukraine has meant that the supply of ball clay from this country has been cut off, giving rise to a serious setback for the manufacture of porcelain tile, as this raw material was a basic component for the formulation of this type of ceramic tile. This work proposes the use of a clay from the Afyon area in Turkey as an alternative, which is formed by a complex mixture of clay and non-clay minerals.
In the first part of the study, a complete characterisation of the clay has been carried out, comparing it with a standard Ukrainian clay. In a second part, a composition in which Afyon clay is the main clay component has been formulated and characterised in comparison with a standard composition formulated with Ukrainian clays. Overall, the results show that, although some properties for Afyon clay differ from those for Ukrainian clays, the behaviour of the proposed composition in the different stages of the process, milling/deflocculation, pressing and firing, is similar to that of the standard composition, thus adapting it to the requirements of industrial practice. This provides a feasible alternative way of replacing Ukrainian ball clays.
乌克兰的冲突意味着该国的球粘土供应已被切断,这给瓷质砖的生产带来了严重的挫折,因为这种原材料是配制这种瓷质砖的基本成分。这项研究建议使用土耳其阿菲永地区的一种粘土作为替代品,这种粘土是由粘土和非粘土矿物的复杂混合物组成的。在研究的第一部分,对这种粘土进行了全面的特性分析,并将其与标准的乌克兰粘土进行了比较。在第二部分中,对以阿菲永粘土为主要粘土成分的组合物进行了配制,并将其特征与用乌克兰粘土配制的标准组合物进行了比较。总之,研究结果表明,尽管阿菲永粘土的某些特性与乌克兰粘土不同,但所建议的成分在加工过程的不同阶段(研磨/去絮凝、压制和烧制)的表现与标准成分相似,因此能适应工业实践的要求。这为替代乌克兰球粘土提供了一种可行的替代方法。
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引用次数: 0
Characterization of the dynamic properties of an automotive laminated glass ceiling 汽车夹层玻璃天花板的动态特性表征
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-09-01 DOI: 10.1016/j.bsecv.2024.05.001
Jon García-Barruetabeña, David Miñón, Beatriz Achiaga, Fernando Cortés
This article presents a methodology for the characterization of the dynamic properties of a laminated glass automotive ceiling, motivated by the inherent difficulty in obtaining laboratory samples from this kind of components. This methodology is based on the identification of the effective complex modulus of the laminated glass ceiling through Experimental Modal Analysis in conjunction with a finite element model. Besides, a material behaviour model is proposed for the effective complex module. Then, the dynamic properties of the laminated glass core are extracted from the latter using a reverse homogenized formulation of sandwich plates specifically developed in this work. As a result, a methodology to accurately predict the dynamic behaviour of these key automotive components has been achieved. An additional advantage of this methodology is that the identification of properties is carried out from a manufactured component and not from samples of reduced geometries, considering the impact of the manufacturing process.
本文介绍了一种表征汽车夹层玻璃天花板动态特性的方法,这种方法的动机是由于从此类部件中获取实验室样本存在固有的困难。该方法的基础是通过实验模态分析和有限元模型确定夹层玻璃顶棚的有效复合模量。此外,还提出了有效复合模量的材料行为模型。然后,利用本研究中专门开发的夹层板反向均质化公式,从后者中提取夹层玻璃核心的动态特性。因此,准确预测这些关键汽车组件动态特性的方法得以实现。该方法的另一个优点是,考虑到制造过程的影响,属性识别是通过制造组件而不是缩小几何形状的样品来进行的。
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引用次数: 0
Basic microstructural, mechanical, electrical and optical characterisation of BaTiAl6O12 ceramics BaTiAl6O12 陶瓷的基本微观结构、机械、电气和光学特性分析
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-09-01 DOI: 10.1016/j.bsecv.2024.06.002
Daniel Drdlik , Vojtech Marak , Robert Klement , Pavel Tofel , Katarina Drdlikova , Hynek Hadraba , Zdenek Chlup
In progressive particle or layered composites based on a combination of BaTiO3 and Al2O3, serving as e.g. ceramic harvesters, new phases are formed during heat treatment. The dominant one is BaTiAl6O12. This study provides information about the microstructural, mechanical and optical properties of the BaTiAl6O12 ceramics. The evolution of the phases during the solid-state reaction synthesis of the BaTiAl6O12 was monitored. The fully dense samples prepared by spark plasma sintering had indentation Vickers hardness and indentation elastic modulus within ranges of 10.1–13.7 GPa and 132.0–187.0 GPa, depending on loading force. The three-point bending tests of the BaTiAl6O12 samples resulted in flexural strength of 129.9 MPa and fracture toughness of 1.8 MPa m1/2. The sample showed blue broad-band emission under UV excitation due to the charge-transfer transition of the Ti4+ and defect sites. The BaTiAl6O12 evinced low permittivity (ɛ′) = 16 and dielectric loss (tan δ) <0.0003 at a frequency 1 kHz.
在基于 BaTiO3 和 Al2O3 组合的渐进式颗粒或层状复合材料(如陶瓷收割机)中,在热处理过程中会形成新的相。其中最主要的是 BaTiAl6O12。这项研究提供了有关 BaTiAl6O12 陶瓷的微观结构、机械和光学特性的信息。在 BaTiAl6O12 的固态反应合成过程中,对相的演变进行了监测。通过火花等离子烧结制备的全致密样品的压痕维氏硬度和压痕弹性模量在 10.1-13.7 GPa 和 132.0-187.0 GPa 范围内,具体取决于加载力。BaTiAl6O12 样品的三点弯曲测试结果显示其抗弯强度为 129.9 兆帕,断裂韧性为 1.8 兆帕 m1/2。由于 Ti4+ 和缺陷位点的电荷转移转变,样品在紫外激发下显示出蓝色宽带发射。在频率为 1 kHz 时,BaTiAl6O12 的介电常数(ɛ′)= 16,介电损耗(tan δ)<0.0003。
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引用次数: 0
Spectroscopic insight into the structural and microstructural properties of La2Ce2O7 ceramics 通过光谱深入了解 La2Ce2O7 陶瓷的结构和微观结构特性
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-09-01 DOI: 10.1016/j.bsecv.2024.07.002
María Luisa Sanjuán , Rosa Isabel Merino , Annu Kumar Lakshya , Anirban Chowdhury
Ceria-based compounds with trivalent dopant ions are currently being investigated as electrolytes for solid oxide fuel cells operating at low to intermediate temperatures. In these materials, the dependence of the ionic conductivity on the dopant content, the relative cation size and the dopant/vacancy or vacancy/vacancy interactions are the subject of intense research, but there is scarce information about a possible correlation between these properties and microstructural ones, such as texture. Here, we address this question in the heavily doped fluorite-like La2Ce2O7 oxide, using a combination of X-ray diffraction, electron microscopy, optical absorption, Raman scattering and impedance spectroscopy. In all cases, materials with varying degree of 〈1 1 1〉 texture are compared with untextured samples. In this context, the most relevant Raman signatures are the fluorite-like mode at ∼448 cm−1 and a vacancy-related band at ∼578 cm−1. Although remarkable changes were observed upon varying the sintering temperature or the excitation wavelength, both textured and untextured materials displayed similar evolution. A selective enhancement of the vacancy-related band was observed upon decreasing the excitation wavelength from 647 to 488 nm, which is attributed to a resonance phenomenon involving vacancy-related electronic transitions. An indication of incipient vacancy ordering was given by the observation of an intense band at ∼346 cm−1, denoting C-R2O3-like short-range order; its enhancement with the annealing temperature is attributed to the growth of the C-like regions. Conductivity was measured in textured and untextured, fully dense pellets, in the former along and across the texture direction. Impedance plots suggest that the conductivity is dominated by oxide ions and do not allow to separate a grain boundary contribution in these materials with grain size around 1–2 μm. The conductivity amounts to around 10−5 S/cm at 650 K, with activation energy of 1.08–1.16 eV in the temperature range from around 470 to 870 K. Results were similar in textured and untextured materials. We conclude that there is no significant correlation between texture and vacancy concentration or vacancy ordering. A similar conclusion – no influence of texture – is reached concerning the electrical properties.
目前正在研究将含有三价掺杂离子的铈基化合物作为在中低温下工作的固体氧化物燃料电池的电解质。在这些材料中,离子电导率与掺杂剂含量、相对阳离子尺寸和掺杂剂/空位或空位/空位相互作用的关系是研究的热点,但有关这些特性与微观结构特性(如质地)之间可能存在的相关性的信息却很少。在此,我们结合使用 X 射线衍射、电子显微镜、光学吸收、拉曼散射和阻抗光谱,在重掺杂萤石类 La2Ce2O7 氧化物中解决了这一问题。在所有情况下,具有不同程度〈1 1 1〉纹理的材料都与无纹理样品进行了比较。在这种情况下,最相关的拉曼特征是 ∼448 cm-1 处的萤石样模式和 ∼578 cm-1 处的空位相关带。尽管在改变烧结温度或激发波长时观察到了明显的变化,但有纹理和无纹理材料都显示出类似的演变。当激发波长从 647 纳米降低到 488 纳米时,观察到空位相关带有选择性地增强,这归因于涉及空位相关电子跃迁的共振现象。在 ∼346 cm-1 处观察到一个强烈的条带,表示类似 C-R2O3 的短程有序,这表明了空位有序化的萌芽;它随退火温度的升高而增强,这归因于类似 C 区域的增长。在有纹理和无纹理、完全致密的颗粒中测量了前者沿纹理方向和跨纹理方向的电导率。阻抗图显示,导电性主要由氧化物离子主导,无法从这些晶粒尺寸约为 1-2 μm 的材料中分离出晶界的贡献。在 650 K 时,电导率约为 10-5 S/cm,在约 470 至 870 K 的温度范围内,活化能为 1.08-1.16 eV。我们得出结论:质地与空位浓度或空位排序之间没有明显的相关性。在电学特性方面,我们也得出了类似的结论--质地没有影响。
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引用次数: 0
Inteligencia artificial y materiales 人工智能与材料
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-09-01 DOI: 10.1016/j.bsecv.2024.10.003
Amador C. Caballero
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引用次数: 0
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Boletin de la Sociedad Espanola de Ceramica y Vidrio
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