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Enhancing NiZn ferrite properties through microwave sintering: A comparative study 通过微波烧结提高镍锌铁氧体性能:比较研究
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-05-01 DOI: 10.1016/j.bsecv.2023.10.003
Carolina Clausell-Terol , Antonio Barba-Juan , Andres Mormeneo-Segarra , Piotr Putyra , Lucyna Jaworska

The structural, microstructural, morphological, and electromagnetic properties of a micro- and nanostructured nickel–zinc ferrite ((Cu0.12Ni0.23Zn0.65)Fe2O4) were studied after sintering between 900 and 1100 °C. The microparticulated ferrite (MICRO) was a commercial material, while the nanoparticulated ferrite (NANO) was obtained through high energy milling of the former. The effect of microwave heating (MW), compared to traditional infrared sintering (IR), was investigated.

Microwave sintering successfully controlled the grain growth of both granulometries and produced sintered bodies with high relative densities (low porosity), small average grain size, narrow grain size distribution, and a high value of the complex magnetic permeability-imaginary part (μ″) for the MICRO ferrite. In the case of the NANO ferrite, microwave sintering yielded values similar to those obtained by conventional IR.

Microwave sintering significantly affected the densification and grain growth processes for both granulometries studied. Additionally, reducing the granulometry of the starting ferrite powder had a noticeable impact on the microstructure and electromagnetic properties of the sintered ferrites, regardless of whether microwave or infrared radiation was used. However, the magnetic property (μ″) decreased when the particle size of the starting powder was reduced from micro to nanometric scale, irrespective of the sintering source. This observation is supported by our previously published mathematical models that establish relationships between the complex magnetic permeability, magnetization mechanisms, angular frequency, and ferrite microstructure.

研究了一种微观和纳米结构的镍锌铁氧体((Cu0.12Ni0.23Zn0.65)Fe2O4)在 900 至 1100 °C 烧结后的结构、微观结构、形态和电磁特性。微颗粒铁氧体(MICRO)是一种商用材料,而纳米颗粒铁氧体(NANO)则是通过对前者进行高能研磨获得的。与传统的红外烧结(IR)相比,微波加热(MW)的效果得到了研究。微波烧结成功地控制了两种粒度的晶粒生长,生产出的烧结体相对密度高(孔隙率低)、平均晶粒尺寸小、晶粒尺寸分布窄,并且 MICRO 铁氧体的复合磁导率-虚部(μ″)值高。微波烧结显著影响了所研究的两种粒度的致密化和晶粒生长过程。此外,无论使用微波还是红外辐射,降低初始铁氧体粉末的粒度都会对烧结铁氧体的微观结构和电磁特性产生明显影响。然而,当起始粉末的粒度从微米级减小到纳米级时,磁性能(μ″)会下降,与烧结源无关。我们之前公布的数学模型支持这一观察结果,这些模型建立了复合磁导率、磁化机制、角频率和铁氧体微观结构之间的关系。
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引用次数: 0
Desafíos transversales en cerámica y vidrio 陶瓷和玻璃领域的横向挑战
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-05-01 DOI: 10.1016/j.bsecv.2024.06.001
Amador C. Caballero
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引用次数: 0
Influence of nanosilica in the chloride binding capacity of sustainables ground blast furnace slag and metakaolin 纳米二氧化硅对可持续研磨高炉矿渣和偏高岭土氯化物结合能力的影响
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-05-01 DOI: 10.1016/j.bsecv.2023.09.002
Alberto Isaac Ruiz, Miguel Ángel de la Rubia, Amparo Moragues, Encarnación Reyes

This work investigates the chloride binding capacity combine of two sustainable pozzolanic additions such as granulated blast furnace slag (G) and metakaolin (M) used in cement to decrease its carbon footprint. They are also combined with two nanosilicas with different specific surface area (O and A). Blends of alone M or G and with nanosilica are mixed in water with Ca(OH)2 and chloride (C) to compare chloride binding capacity of both in presence or not of nanosilica. Blends are analysed by XRD, FTIR, DTA–TG and chloride binding capacity is determined too by potentriometric titration with AgNO3. The addition of chlorides to both pozzolanic M and G indicates that M shows higher chloride binding capacity than G although very similar Friedel's salt formation, indicating a higher physisorbed chlorides contain. Chlorides addition meaningfully replaces carbonates in carboaluminates phases to form Friedel's salt, being this exchange higher for samples with M than for G blends. The combination of experimental techniques used in this study have shown that the effect of nanosilica addition to samples with M and G show an opposite effect in Friedel's salt formation, increasing for samples with G and decreasing for samples that contain M.

这项工作研究了水泥中使用的粒化高炉矿渣(G)和偏高岭土(M)这两种可持续添加剂的氯化物结合能力,以减少其碳足迹。它们还与两种具有不同比表面积(O 和 A)的纳米硅结合在一起。将单独的 M 或 G 与纳米二氧化硅的混合物在水中与 Ca(OH)2 和氯化物 (C) 混合,以比较两者在有无纳米二氧化硅存在的情况下的氯化物结合能力。混合物通过 XRD、傅立叶变换红外光谱、DTA-TG 进行分析,氯化物结合能力也通过 AgNO3 的效价滴定来确定。向 M 和 G 两种水青石中添加氯化物的结果表明,虽然弗里德尔盐的形成非常相似,但 M 的氯化物结合能力高于 G,这表明物理吸附氯化物的含量更高。氯化物的加入有意义地取代了碳铝酸盐相中的碳酸盐,从而形成了弗里德尔盐,与 G 混合材料相比,M 混合材料样品中的这种交换量更高。本研究采用的综合实验技术表明,在含有 M 和 G 的样品中添加纳米二氧化硅对弗里德尔盐的形成有相反的影响,含有 G 的样品中的弗里德尔盐会增加,而含有 M 的样品中的弗里德尔盐会减少。
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引用次数: 0
Synthesis and characterisation of hybrids composed of calcined hydrotalcite and residual textile dyes 煅烧水滑石和残留纺织染料组成的混合物的合成与表征
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-05-01 DOI: 10.1016/j.bsecv.2023.09.003
Daniel López-Rodríguez , Jorge Jordan-Nuñez , Bàrbara Micó-Vicent , Raúl Llinares Llopis , María Moncho-Santonja

There is growing concern about the health of our planet, which has led to a search for methods to purify and recover the pollutant materials that are released into the environment. Among all industries, the dyeing sector of the textile industry is considered one of the most polluting. However, advancements in technology, such as the use of nanoadsorbents, have made it possible to effectively treat and clean these wastewaters by harnessing the adsorption capabilities of these minerals. As a result, highly functional pigmentary hybrids with improved characteristics can be obtained. In this study, the research focuses on exploring the potential of hydrotalcite in combination with reactive, disperse, and direct dyes. Colour measurements are conducted using reflection spectrophotometers to evaluate the colour performance of the hybrid materials, yielding successful results. X-ray diffraction (XRD) analysis is used to verify the structural integrity of the hydrotalcite and confirm the adsorption of the dyes. Additionally, thermogravimetric tests (TGA) are carried out to assess the thermal stability of the different samples, while the colorants’ protection provided by the hydrotalcite is evaluated through total soluble recovery (TSR) measurements. An FTIR analysis is used to detect the presence of characteristic functional groups of the dyes in the resulting hybrids. Surface area and porosity measurements utilising the BET method, along with Scanning Electron Microscopy Energy + Dispersive X-ray spectroscopy (SEM–EDX) and X-ray photoelectron spectroscopy (XPS) tests, are also conducted. In summary, this study investigates the potential of hydrotalcite as an effective adsorbent for various dyes used in the textile industry. The research involves comprehensive analyses, including colour evaluation, structural characterisation, thermal stability assessment, and surface morphology examination. These findings contribute to the development of sustainable and environmentally friendly approaches in the treatment of textile wastewater.

人们越来越关注地球的健康,因此开始寻找净化和回收排放到环境中的污染物质的方法。在所有行业中,纺织业的染色行业被认为是污染最严重的行业之一。然而,技术的进步,如纳米吸附剂的使用,使得利用这些矿物的吸附能力有效处理和净化这些废水成为可能。因此,可以获得具有更好特性的高功能性颜料混合物。在本研究中,研究重点是探索水滑石与活性染料、分散染料和直接染料相结合的潜力。使用反射分光光度计进行了颜色测量,以评估混合材料的颜色性能,并取得了成功的结果。X 射线衍射(XRD)分析用于验证水滑石的结构完整性,并确认染料的吸附性。此外,还进行了热重试验(TGA)以评估不同样品的热稳定性,并通过测量总溶解回收率(TSR)来评估水滑石对着色剂的保护作用。傅立叶变换红外光谱分析用于检测所得混合物中染料特征官能团的存在。此外,还利用 BET 方法测量了表面积和孔隙率,并进行了扫描电子显微镜能量+色散 X 射线光谱(SEM-EDX)和 X 射线光电子能谱(XPS)测试。总之,本研究调查了水滑石作为纺织业所用各种染料的有效吸附剂的潜力。研究涉及综合分析,包括颜色评估、结构表征、热稳定性评估和表面形态检查。这些发现有助于开发可持续和环保的纺织废水处理方法。
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引用次数: 0
Cost-efficient natural apatite–metakaolin supported TiO2 mesoporous membrane for dye removal applications 用于去除染料的成本效益型天然磷灰石-高岭土支撑 TiO2 介孔膜
IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-05-01 DOI: 10.1016/j.bsecv.2023.10.002
Youssef Guesmi , Ibtissem Ounifi , Mohamed Khabbouchi , Hassen Agougui , Amor Hafiane , Miguel A. Rodríguez

The synthesis of a TiO2-tight ultrafiltration membrane supported on a low-cost ceramic substrate based on metakaolin and natural apatite was proposed in this study. To optimize the substrate composition, three samples were prepared by combining metakaolin and natural apatite with weight ratios of 25:75 (MK25), 50:50 (MK50), and 75:25 (MK75), and then sintered for 2 h at 850, 900, 950, and 1000 °C. The effect of sintering temperature and metakaolin content on the final properties of the prepared samples was studied in terms of microstructure, porosity, and mechanical strength. According to the results, the mechanical strength increased with increasing temperature and metakaolin content, but at the same time, the porosity decreased. MK50 composition and the temperature of 950 °C were chosen as optimal conditions, and the support was prepared by extrusion. The prepared substrate presented a compressive strength of 4.4 MPa, porosity of 33%, and an average pore size of 2.2 μm. To prepare a crack-free ultrafiltration membrane, the deposition of the TiO2 top layer was favoured over an alumina intermediate layer. The obtained membrane has a pore size of 6.8 nm and water permeability of 5.6 L h−1 m−2 bar−1. The membrane performance was tested for the removal of cationic and anionic dyes. The ultrafiltration experiments have shown a high removal rate for anionic and cationic dyes. Specifically, it was found that the removal rates of these dyes exceeded 75% without adjusting the pH of the solution.

本研究提出了一种基于偏高岭土和天然磷灰石的低成本陶瓷基底的二氧化钛密封超滤膜的合成方法。为了优化基底成分,将偏高岭土和天然磷灰石以 25:75 (MK25)、50:50 (MK50) 和 75:25 (MK75) 的重量比混合制备了三种样品,然后分别在 850、900、950 和 1000 °C 下烧结 2 小时。研究了烧结温度和偏高岭土含量对制备样品最终性能的影响,包括微观结构、孔隙率和机械强度。结果表明,机械强度随温度和偏高岭土含量的增加而增加,但同时孔隙率却降低了。选择 MK50 成分和 950 °C 的温度作为最佳条件,并通过挤压法制备支撑物。制备的基底抗压强度为 4.4 兆帕,孔隙率为 33%,平均孔径为 2.2 微米。为了制备无裂纹超滤膜,二氧化钛表层的沉积优先于氧化铝中间层。获得的膜孔径为 6.8 nm,透水性为 5.6 L h-1 m-2 bar-1。测试了膜去除阳离子和阴离子染料的性能。超滤实验表明,阴离子和阳离子染料的去除率很高。具体来说,在不调节溶液 pH 值的情况下,这些染料的去除率超过了 75%。
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引用次数: 0
Sol–gel derived ZnO thin film as a transparent counter electrode for WO3 based electrochromic devices 溶胶凝胶衍生氧化锌薄膜作为基于 WO3 的电致变色设备的透明对电极
IF 3.4 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-03-01 DOI: 10.1016/j.bsecv.2023.08.002
Ajitha Haridasan Haritha , Martin Rozman , Alicia Duran , Dušan Galusek , José Joaquín Velazquez , Yolanda Castro

Electrochromic devices (ECDs) have the ability to show color even when electrical power is disconnected. However, challenges such as simple and cost-effective electrochromic material preparation, insufficient coloration, slow switching times, and poor cycling stability have yet to be overcome. The paper describes an electrochromic device with WO3 thin film as the electrochromic material for the working electrode and ZnO thin film as a counter electrode fabricated on FTO glass substrates by a simple sol–gel spin coating method. The optical contrast at 600 nm of ZnO counter electrode based ECD (12.4%) is almost double that of graphite counter electrode based ECD (6.5%), showing higher efficiency and better electrochromic response. The properties of ECD devices were also examined using cyclic voltammetry and chronoamperometry measurements with results showing that the devices were stable and the charge required to tint the device (5.6 mA s) is reduced compared to typical graphite-coated counter electrode. These types of devices are promissing candidates to be used as smart windows.

电致变色器件(ECD)能够在断电的情况下显示颜色。然而,电致变色材料制备简单、成本低廉、着色不充分、开关时间慢、循环稳定性差等难题仍有待克服。本文介绍了一种以 WO3 薄膜为工作电极的电致变色材料、以 ZnO 薄膜为对电极的电致变色装置,该装置采用简单的溶胶-凝胶旋涂方法在 FTO 玻璃基底上制备而成。基于氧化锌对电极的 ECD 在 600 纳米波长处的光学对比度(12.4%)几乎是基于石墨对电极的 ECD(6.5%)的两倍,显示出更高的效率和更好的电致变色响应。此外,还使用循环伏安法和时变测量法对 ECD 器件的特性进行了研究,结果表明,与典型的石墨涂层对电极相比,这些器件非常稳定,而且使器件着色所需的电荷(5.6 mA s)也有所减少。这类装置有望用作智能窗户。
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引用次数: 0
Low temperature synthesis of novel (Cr,V)-ZrSiO4 jewel green pigments with near-infrared reflection performance 低温合成具有近红外反射性能的新型 (Cr,V)-ZrSiO4 宝石绿颜料
IF 3.4 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-03-01 DOI: 10.1016/j.bsecv.2023.07.001
Feng Jiang , Junling Yu , Guo Feng , Tao Wang , Xiaojun Zhang , Quan Zhang , Rongchi Zhang , Qian Wu , Qing Hu , Yun Yu , Jianmin Liu

Novel (Cr,V)-ZrSiO4 jewel green pigments with near-infrared reflection performance were prepared at a low temperature of 900 °C. Effects of Cr/Si mole ratio on phase composition, microstructure, Vis–NIR reflection performance, optical properties and thermal stability were studied. The results show that with the increase of Cr/Si mole ratio from 0 to 0.4, the color of the pigment changes from blue to jewel green and then to dark green. When the Cr/Si mole ratio is 0.2, the (Cr,V)-ZrSiO4 jewel green pigment shows the best comprehensive properties, which has rendering performance (L* = 56.69, a* = −18.52, b* = −9.28), thermal stability, and near-infrared reflection performance. The properties especially excellent near-infrared reflection performance make it promising functional pigment in heat insulation.

在 900 ℃ 的低温下制备了具有近红外反射性能的新型 (Cr,V)-ZrSiO4 宝石绿颜料。研究了铬/硅摩尔比对相组成、微观结构、可见光-近红外反射性能、光学性能和热稳定性的影响。结果表明,随着铬/硅摩尔比从 0 增加到 0.4,颜料的颜色从蓝色变为宝石绿,然后变为深绿色。当 Cr/Si 摩尔比为 0.2 时,(Cr,V)-ZrSiO4 宝石绿颜料的综合性能最好,具有渲染性能(L* = 56.69,a* = -18.52,b* = -9.28)、热稳定性和近红外反射性能。这些特性尤其是优异的近红外反射性能,使其成为一种前景广阔的隔热功能颜料。
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引用次数: 0
Developing ABO3 perovskites synthesized by the Pechini method for their potential application as cathode material in solid oxide fuel cells: Structural and electrical properties 开发用 Pechini 法合成的 ABO3 包晶,使其有可能用作固体氧化物燃料电池的阴极材料:结构和电学特性
IF 3.4 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-03-01 DOI: 10.1016/j.bsecv.2023.09.001
Miguel Antonio Domínguez-Crespo , Aidé Minerva Torres-Huerta , Silvia Beatriz Brachetti-Sibaja , Adela Eugenia Rodríguez-Salazar , Francisco Gutiérrez-Galicia , Esther Ramírez-Meneses , Ángela Iveth Licona-Aguilar

In this research, the effect of La substitution by Pr cation in the A-site of ABO3 perovskites was carried out using the Pechini method for use in solid state fuel cells (SOFCs). The atomic compositions of Pr varied from x = 0.35, 0.49, 0.53, 0.56, 0.63 and 0.7 in the La0.7−xPrxCa0.3MnO3 (LPCM) perovskites. The XRD patterns indicated that all the perovskites crystallized in the orthorhombic system with Pnma space group, but only in atomic compositions of 0.53 and 0.70 is possible to obtain pure phases; whereas the other compositions present narrow peaks of La and Pr oxides that are reduced with the amount of the cationic substitution. The Rietveld methodology and its analysis by the Goldsmith tolerance factor indicated that the stability of the samples was achieved through Jahn-Teller distortion in the b-axis. The Mn3+/Mn4+ atomic ratios determined by XPS measurements suggested that the substitution of La ions by Pr promotes the hole doped system instead of electron system. The electrical conductivity showed that the synthesized perovskites are mixed ionic and electronic conductors which positively influence their application in SOFCs. In particular, the La0.17Pr0.53Ca0.3MnO3 may be a good cathode candidate for these devices.

本研究采用 Pechini 法研究了在 ABO3 包晶石的 A 位上用 Pr 阳离子取代 La 对固态燃料电池 (SOFC) 的影响。在 La0.7-xPrxCa0.3MnO3 (LPCM) 包晶石中,Pr 的原子组成在 x = 0.35、0.49、0.53、0.56、0.63 和 0.7 之间变化。X 射线衍射图显示,所有包晶石都在 Pnma 空间群的正方晶系中结晶,但只有原子成分为 0.53 和 0.70 的包晶石才有可能获得纯相;而其他成分的包晶石则出现了窄的 La 和 Pr 氧化物峰,且随着阳离子取代量的增加而减少。里特维尔德方法及其戈德史密斯公差系数分析表明,样品的稳定性是通过 b 轴上的 Jahn-Teller 变形实现的。通过 XPS 测量确定的 Mn3+/Mn4+ 原子比表明,Pr 取代 La 离子促进了空穴掺杂体系而不是电子体系的形成。电导率表明,合成的包晶石是离子和电子混合导体,这对它们在 SOFC 中的应用产生了积极影响。特别是,La0.17Pr0.53Ca0.3MnO3 可能是这些设备的理想阴极。
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引用次数: 0
Template-free hydrothermal preparation of IR-blue light upconverting NaYF4: Yb, Eu phosphors 无模板水热法制备红外蓝光上转换NaYF4:Yb,Eu荧光粉
IF 3.4 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-03-01 DOI: 10.1016/j.bsecv.2023.07.004
Cristina Ruiz-Santaquiteria , David G. Calatayud , Kevin Gutiérrez , Marina Villegas , Marco Peiteado , Teresa Jardiel

Highly efficient IR-blue light up-converting NaYF4: Yb3+, Eu2+ phosphors have been prepared by a template-free hydrothermal method under mild and reductive experimental conditions. It has been demonstrated that for a fixed reaction time and temperature (150 °C/4 h), the α  β NaYF4 conversion can be accurately controlled by modifying the F/Y ratio. UC emission spectroscopy reveals that IR-blue light emission efficiency is greatly improved when β-NaYF4 phase predominates. Under the experimental conditions set in this work, reaching full α  β conversion just by increasing fluoride content entails the co-crystallization of the secondary phase YF3 1.5NH3, but far from causing a detrimental effect on the optical properties, it has been found that the samples where both β-NaYF4 and YF3 1.5NH3 phases coexist, exhibit outstanding optical properties.

在温和的还原实验条件下,通过无模板水热法制备了高效的红外蓝光上转换 NaYF4:Yb3+, Eu2+ 荧光粉。实验证明,在固定的反应时间和温度(150 °C/4小时)下,通过改变 F/Y 比例,可以精确控制α → β NaYF4 的转化率。紫外发射光谱显示,当 β-NaYF4 相占优势时,红外蓝光发射效率大大提高。在本文设定的实验条件下,仅通过增加氟含量就能达到完全的 α → β 转换,会导致次生相 YF3 1.5NH3 共晶,但β-NaYF4 和 YF3 1.5NH3 相共存的样品不但不会对光学特性造成不利影响,反而会表现出优异的光学特性。
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引用次数: 0
Nueva junta de gobierno de la Sociedad Española de Cerámica y Vidrio 西班牙陶瓷和玻璃协会新一届理事会
IF 3.4 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-03-01 DOI: 10.1016/j.bsecv.2024.04.003
Amador C. Caballero
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引用次数: 0
期刊
Boletin de la Sociedad Espanola de Ceramica y Vidrio
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