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Archaeometric characterization of glass and a carnelian bead to study trade networks of two Swahili sites from the Ibo Island (Northern Mozambique) 伊博岛(莫桑比克北部)两个斯瓦希里遗址的贸易网络研究:玻璃和玛瑙珠的考古特征
IF 3.4 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2023-09-01 DOI: 10.1016/j.bsecv.2022.09.001
Manuel García-Heras , Fernando Agua , Hilario Madiquida , Víctor M. Fernández , María Ángeles Villegas , Marisa Ruiz-Gálvez

A representative set of glass from mostly Indo-Pacific type beads and other materials including a carnelian bead from two Swahili sites of the Ibo Island at Northern Mozambique has been archaeometrically characterized to get insights into its likely provenance within the framework of the Indian Ocean trade networks. Selected samples were examined and analyzed by using binocular magnifying glass, field emission scanning electron microscopy with energy dispersive X-ray microanalysis, visible spectrophotometry and X-ray diffraction. Up to four different types of glasses were identified according to its chemical composition: mineral-soda alumina glass from Western India, vegetal-soda alumina glass from Central Asia, a conventional soda-lime silicate glass coming probably from Europe and a lead silicate glass of the PbO-SiO2 binary system most likely from Venice. Red and yellow colours were obtained through colloidal chromophores: cuprite micro-crystals for red brick and lead stannate and/or lead antimoniate micro-crystals for yellow, while deep blue, greenish blue and yellowish colours were obtained through ionic chromophores. Either the carnelian bead or the different types of glass are imported materials resulting from Swahili trade networks of the Indian Ocean, since no evidence of glass production or recycling has been found in archaeological fieldwork.

在莫桑比克北部伊博岛的两个斯瓦希里遗址中,一组具有代表性的玻璃主要由印度-太平洋类型的珠子和其他材料制成,其中包括一颗玛瑙珠,这些材料已被考古鉴定,以深入了解其在印度洋贸易网络框架内的可能来源。采用双筒放大镜、场发射扫描电镜-能量色散x射线显微分析、可见分光光度法和x射线衍射法对所选样品进行了检测和分析。根据其化学成分,鉴定出多达四种不同类型的玻璃:来自西印度的矿物-苏打氧化铝玻璃,来自中亚的植物-苏打氧化铝玻璃,可能来自欧洲的传统钠钙硅酸盐玻璃,以及最有可能来自威尼斯的PbO-SiO2二元体系的铅硅酸盐玻璃。通过胶体发色团可以得到红色和黄色:红砖用的是铜微晶体,黄色用的是锡酸铅和/或锑酸铅微晶体,而离子发色团可以得到深蓝色、绿蓝色和黄色。无论是玛瑙珠还是不同类型的玻璃都是从印度洋的斯瓦希里贸易网络进口的材料,因为在考古现场工作中没有发现玻璃生产或回收的证据。
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引用次数: 0
Efecto de la incorporación de ceniza de bagazo de caña en las propiedades mecánicas y las emisiones de dióxido de carbono del hormigón preparado con residuos de vidrio 甘蔗渣灰分掺量对废玻璃混凝土力学性能和二氧化碳排放的影响
IF 3.4 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2023-09-01 DOI: 10.1016/j.bsecv.2022.08.001
Oscar Felipe Arbeláez Pérez , Karen Alejandra Delgado Varela , Juan David Castañeda Mena

The production of cement depletes natural resources and emits huge amounts of CO2. Using waste materials as replacement for cement is a practical solution to produce green concrete. Cane bagasse ash (CBA) and waste glass (WG) have great potential as supplementary cementitious materials. This work presents the effect of the incorporation of cane bagasse ash on mechanical properties and CO2 emissions of concrete prepared waste glass. Different CBA:WG mass ratio 0:1, 1:3, 1:2, 1:1, 2:1, 3:1 and 1:0 (CBA + WG = 20%) as cement replacement were prepared. The slump decreased with an increase of waste glass and sugar cane bagasse. The incorporation of sugarcane bagasse ash and waste glass it is not related with the density of concrete due to similar density between cementitious materials. The relative compressive strength increased with inclusion of CBA, the 3:1 mixture exhibited the highest relative compressive strength. The CO2 emissions were reduced when WG and CBA were incorporated. The addition of cane bagasse ash to concrete prepared with waste glass may be a potential option to mitigate the impact of residues and to reduce the CO2 emissions in concrete industry.

水泥的生产消耗自然资源,并排放大量的二氧化碳。利用废旧材料替代水泥是生产绿色混凝土的切实可行的解决方案。蔗渣灰(CBA)和废玻璃(WG)作为补充胶凝材料具有很大的潜力。本文介绍了蔗渣灰掺入对废玻璃混凝土的机械性能和二氧化碳排放的影响。制备了不同CBA:WG质量比0:1、1:3、1:2、1:1、2:1、3:1和1:0 (CBA + WG = 20%)作为水泥替代品。随着废玻璃和甘蔗渣用量的增加,坍落度减小。蔗渣灰和废玻璃的掺入与混凝土的密度无关,因为胶凝材料之间的密度相似。相对抗压强度随着CBA掺入量的增加而增加,其中3:1的混合料相对抗压强度最高。当加入WG和CBA时,二氧化碳排放量减少了。在用废玻璃制备的混凝土中加入蔗渣灰烬可能是减轻残留物影响和减少混凝土工业中二氧化碳排放的潜在选择。
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引用次数: 1
Structural and electrical properties of Zr-doped K0.48Na0.52NbO3 ceramics: “Hard” lead-free piezoelectric Zr掺杂K0.48Na0.52NbO3“硬质”无铅压电陶瓷的结构和电学性能
IF 3.4 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2023-09-01 DOI: 10.1016/j.bsecv.2022.12.001
Héctor Beltrán-Mir , Xavier Vendrell , Emerson Luiz dos Santos Veiga , Lourdes Mestres , Eloísa Cordoncillo

The structural and electrical properties of K0.48Na0.52Nb1−xZrxO3−δ (x = 0–0.04) ceramics prepared by the conventional solid-state reaction method were studied. Pellets with composition x  0.03 sintered at 1125 °C for 2 h showed single-phase of potassium sodium niobate (KNN) perovskite structure. Based on X-ray diffraction and Raman results, a mixture of orthorhombic and monoclinic phases was observed in intermediate compositions. The addition of Zr improved the sinterability and the “hard” piezoelectric properties of KNN, increasing the Ec and Qm values. The composition with x = 0.03 presented the highest permittivity at room temperature, ɛr = 363 and the lowest dielectric losses, tan δ = 0.027. Moreover, it was the sample with the highest Qm and d33 values, with Qm = 1781 and d33 = 82 pC/N. It was therefore the best compositions to obtain a “hard” piezoelectric material based on Zr-doped KNN, which makes it promising candidate for use as “hard” lead-free piezoelectric material for high power applications.

研究了用常规固相反应方法制备的K0.48Na0.52Nb1−xZrxO3−δ(x=0–0.04)陶瓷的结构和电学性能。成分x≤0.03的球团在1125°C下烧结2小时,显示出单相铌酸钾钠(KNN)钙钛矿结构。基于X射线衍射和拉曼结果,在中间成分中观察到正交相和单斜相的混合物。Zr的加入提高了KNN的可烧结性和“硬”压电性能,增加了Ec和Qm值。x=0.03的组分在室温下表现出最高的介电常数r′=363和最低的介电损耗tanδ=0.027。此外,它是具有最高Qm和d33值的样品,Qm=1781和d33=82pC/N。因此,它是获得基于Zr掺杂KNN的“硬”压电材料的最佳组成,这使它成为高功率应用的“硬的”无铅压电材料。
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引用次数: 1
CTAB-mediated lithium disilicate branched structures as superb adsorbents to remove Mn2+ in water CTAB介导的二硅酸锂支化结构对水中Mn2+的吸附性能
IF 3.4 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2023-09-01 DOI: 10.1016/j.bsecv.2022.07.001
Hui Zhang, Bo Sun, Ying Qian, Tao Yang, Wenge Chen

Removal of heavy metal Mn2+ ions in water is of great importance for human health and it is urgently needed to develop efficient adsorption materials. Here, a green and effective strategy to prepare mesoporous micro/nanostructured lithium disilicates (LDs) by employing the cation surfactant hexadecyltrimethyl-ammonium bromide (CTAB) as morphology control agent in hydrothermal environment, and investigated its adsorption behavior toward Mn2+ ions. The LDs possessed branched structures that were consisted of scattering pyramidal rods bestrewn with secondary nucleated and aggregated nanoparticles. Due to the mesoporous structures and negatively charged surfaces, LDs exhibited a high adsorption capacity up to 346.84 mg g−1 with corresponding removal efficiency up to 99.82% when initial Mn2+ concentration was 82 mg L−1, and their maximum adsorption capacity reached up to 785.25 mg g−1 toward Mn2+ of 250 mg L−1. Results indicated that the isotherm adsorption behavior of LDs was well described by mono-layer Langmuir model and kinetic adsorption fitted well with pseudo-second-order model, implying them the excellent chemical adsorbent to remove Mn2+ from wastewater. We believe this CTAB-modified approach could be extended to prepare other lithium silicates with mesoporous structures, rendering them wider applications in environmental protection.

去除水中重金属Mn2+离子对人体健康具有重要意义,迫切需要开发高效的吸附材料。本文以阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)为形态控制剂,在水热环境中制备了一种绿色有效的中孔微/纳米结构二硅酸锂(LDs),并研究了其对Mn2+离子的吸附行为。LD具有分支结构,由散射的锥形棒和二次成核和聚集的纳米颗粒组成。由于具有介孔结构和带负电荷的表面,当Mn2+初始浓度为82 mg L−1时,LDs表现出高达346.84 mg g−1的吸附能力,相应的去除率高达99.82%,对250 mg L−的Mn2+的最大吸附能力达到785.25 mg g−1。结果表明,LDs的等温线吸附行为用单层Langmuir模型很好地描述,动力学吸附与拟二阶模型很好拟合,表明它们是去除废水中Mn2+的优良化学吸附剂。我们相信这种CTAB修饰的方法可以扩展到制备其他具有介孔结构的硅酸锂,使其在环境保护中有更广泛的应用。
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引用次数: 0
Luces y sombras 灯光和阴影
IF 3.4 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2023-09-01 DOI: 10.1016/j.bsecv.2023.10.001
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引用次数: 0
Rapid one-step preparation of SrZrO3 using Zr4+ gel and SrSO4 ore under alkaline hydrothermal conditions 碱性水热条件下Zr4+凝胶和SrSO4矿一步快速制备SrZrO3
IF 3.4 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2023-09-01 DOI: 10.1016/j.bsecv.2022.12.002
José Remigio Quiñones-Gurrola , Juan Carlos Rendón-Angeles , Zully Matamoros-Veloza , José Luis Rodríguez-Galicia , Kazumichi Yanagisawa

SrZrO3-structured perovskite particles were prepared under hydrothermal conditions in a KOH (5 M) solution using Zr-gel and SrSO4 mineral precursors. The treatments were conducted between 150 and 240 °C for different reaction intervals (1–96 h), and the KOH solution volume varied between 7.5 and 30 mL. To evaluate the effect of the Zr-gel precursor, the treatments were preliminarily conducted with a coprecipitated pasty Zr-gel (Zr(OH)4·9.64H2O) and subsequently with a lyophilized Zr-gel Zr(OH)4 powder. Generally, SrZrO3 particles were produced by a single-step reaction following the simultaneous bulk dissolution of the Zr4+ gel precursor and the SrSO4 powder. However, in the preliminary experiments, a dehydration reaction of the pasty Zr-gel preceded the ultimate single-step reaction, resulting in complete SrZrO3 particle formation taking place over a longer interval of 96 h at 240 °C. In contrast, when using the dried Zr-gel powder, complete feedstock dissolution occurred more rapidly, producing SrZrO3 particles at 200 °C over 48 h. The SrZrO3 particle sizes varied significantly depending on whether the pasty gel or dried powder Zr precursor was used. Particles prepared with the pasty gel exhibited a bimodal size distribution with mean particle sizes of 25 and 65 μm with pseudocubic and star-shaped cuboidal morphologies, respectively. In contrast, particle growth resulting from the rapid dissolution of solid powder feedstock produced cubic-shaped particles, monomodally distributed with an average particle size of 10 μm. Furthermore, byproduct (SrCO3) formation occurred predominantly under earlier stages together with SrZrO3 particle irrespective of the 5 M KOH filling volume; however, at a volume of 15 mL spontaneously achieved in situ the SrCO3 dissolution at intermediate stages of reaction. This reaction pathway did not proceed at small (7.5 mL) and large (30 mL) volumes of the alkaline fluid. A kinetic study indicated that the activation energy required to produce the SrZrO3 cubic-shaped particles was low in both cases, i.e., 15.05 and 22.27 kJ mol−1 between the powder and pasty Zr4+ precursors, respectively.

在水热条件下,使用Zr凝胶和SrSO4矿物前体在KOH(5M)溶液中制备了SrZrO3结构的钙钛矿颗粒。处理在150和240°C之间进行,反应时间间隔不同(1–96小时),KOH溶液体积在7.5和30 mL之间变化。为了评估Zr凝胶前体的效果,初步用共沉淀的糊状Zr凝胶(Zr(OH)4·9.64H2O)进行处理,然后用冻干的Zr凝胶Zr(OH4)粉末进行处理。通常,在Zr4+凝胶前体和SrSO4粉末同时本体溶解之后,通过单步反应制备SrZrO3颗粒。然而,在初步实验中,糊状Zr凝胶的脱水反应先于最终的单步反应,导致SrZrO3颗粒在240°C下在96小时的较长时间内完全形成。相反,当使用干燥的Zr凝胶粉末时,原料的完全溶解发生得更快,在200°C下48小时内产生SrZrO3颗粒。SrZrO3颗粒尺寸根据使用糊状凝胶还是干燥粉末Zr前体而显著变化。用糊状凝胶制备的颗粒呈现双峰尺寸分布,平均粒径分别为25和65μm,具有假立方体和星形立方体形态。相反,固体粉末原料的快速溶解导致的颗粒生长产生了立方形状的颗粒,单体分布,平均粒径为10μm。此外,副产物(SrCO3)的形成主要在早期阶段与SrZrO3颗粒一起发生,而与5M KOH的填充体积无关;然而,在15mL的体积下,在反应的中间阶段自发地原位实现了SrCO3的溶解。该反应途径在小体积(7.5mL)和大体积(30mL)的碱性流体下没有进行。动力学研究表明,在这两种情况下,制备SrZrO3立方体颗粒所需的活化能都很低,即粉末和糊状Zr4+前体之间的活化能分别为15.05和22.27 kJ mol−1。
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引用次数: 1
Mineralogical analysis of Brazilian Portland cements by the Rietveld method with emphasis on polymorphs M1 and M3 of alite 用Rietveld方法对巴西硅酸盐水泥进行矿物学分析,重点是阿利特的多晶型M1和M3
IF 3.4 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2023-09-01 DOI: 10.1016/j.bsecv.2022.06.005
Cleusa M. Rossetto , Geraldo L. Carezzatto , Luis G. Martinez , Marcelo Pecchio , Xavier Turrillas

Eight samples of Portland cement and a clinker provided by the Brazilian Association of Portland Cement were analysed with different laboratory diffractometers and a synchrotron instrument to determine the statistical variability in the determination of the mass percentage of the main crystalline phases. Five laboratories participated in the experiment. Data collection was performed by each laboratory following its own internal procedures for a standard Rietveld analysis of mineral phases. Both Cu and Mo radiations were used. Reflection geometries—with and without sample rotation—and transmission geometries were also used. The synchrotron diffraction pattern was acquired from a rotating capillary and a wavelength of 0.41290 Å. Analysis of all diffraction patterns was performed with the help of TOPAS Academic v. 6 with the specific purpose of determining the proportions of polymorphs M1 and M3 of alite, since their ratio must be taken into account for the subsequent development of the mechanical properties of concrete.

用不同的实验室衍射仪和同步加速器仪器分析了巴西硅酸盐水泥协会提供的八个硅酸盐水泥和一种熟料样品,以确定主晶相质量百分比测定中的统计变异性。五个实验室参加了实验。每个实验室都按照自己的内部程序进行数据收集,以进行矿物相的标准Rietveld分析。同时使用了Cu和Mo辐射。反射几何结构——有和没有样品旋转——和透射几何结构也被使用。同步加速器衍射图是从旋转毛细管中获得的,波长为0.41290Å。在TOPAS Academic v.6的帮助下对所有衍射图进行分析,具体目的是确定阿利特的多晶型M1和M3的比例,因为在随后的混凝土力学性能的发展中必须考虑它们的比例。
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引用次数: 1
Nano-scale aluminium interaction in synthetic hydrated calcium silicate gel studied by 29Si MAS-NMR 29Si-MAS-NMR研究合成水合硅酸钙凝胶中纳米铝的相互作用
IF 3.4 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2023-09-01 DOI: 10.1016/j.bsecv.2022.06.004
Alberto Isaac Ruiz, Encarnación Reyes, Cristina Argiz, Miguel Angel de la Rubia, Amparo Moragues

This research consists of the fabrication of synthetic gels of hydrated calcium silicate (C-S-H gel) and hydrated calcium aluminate silicates (C-A-S-H gel) in aqueous solution oversaturated in calcium hydroxide. These gels were fabricated using nanomaterials with different specific surface area; two nanosilicas (NS), OX50 and A200 (50 and 200 m2/g respectively) and two nanoaluminas (NA), A65 and A130 (65 and 130 m2/g). Mixtures were carried out maintaining a Ca/Si = 2 ratio and variable Al/Si ratios of 0.1, 0.5 and 1. The effect of aluminium incorporation in the C-S-H gel was studied using the nuclear magnetic resonance technique (29Si MAS-NMR), and the information obtained was further processed using the mathematical deconvolution method. Chemical shift bands were delimited to identify the structures. From the results obtained, modifications of the tetrahedral (Qn) in the dreierketten structure were observed in the different combinations, as well as the modification of the bridging tetrahedral (Q2b) due to the presence of aluminium replacing the silica bridging tetrahedron Q2b(1Al). High Q4 values were detected in the C-S-H gel with NS OX50 and this could be associated to a double chain formation very similar to a perfect tobermorite. The length of the mean chains (MCL) was very variable in each blend, but some trends were observed as the Al/Si = 1 ratio and the Al/Si = 0.1 ratio maintain or increases the MCL respectively. The results are interesting and concrete case mixtures with NS OX50 show original trends that have not yet been reported in the literature.

本研究包括在氢氧化钙过饱和的水溶液中制备水合硅酸钙(C-S-H凝胶)和水合铝酸钙硅酸盐(C-A-S-H凝胶)的合成凝胶。这些凝胶是使用具有不同比表面积的纳米材料制造的;两种纳米二氧化硅(NS)OX50和A200(分别为50和200m2/g)以及两种纳米氧化铝(NA)A65和A130(65和130m2/g)。保持Ca/Si=2的比率和0.1、0.5和1的可变Al/Si比率进行混合物。利用核磁共振技术(29Si-MAS-NMR)研究了铝在C-S-H凝胶中的掺入效应,并利用数学反褶积方法对获得的信息进行了进一步处理。化学位移带被界定以识别结构。从所获得的结果来看,在不同的组合中观察到dreierketten结构中四面体(Qn)的修饰,以及由于存在铝取代二氧化硅桥接四面体Q2b(1Al)而导致的桥接四面体(Q2b)的修饰。在具有NS OX50的C-S-H凝胶中检测到高Q4值,这可能与非常类似于完美托贝莫来石的双链形成有关。在每种共混物中,平均链的长度(MCL)变化很大,但随着Al/Si=1和Al/Si=0.1的比例分别保持或增加MCL,观察到一些趋势。结果令人感兴趣,NS OX50的具体案例混合物显示出文献中尚未报道的原始趋势。
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引用次数: 0
Carbonation of alkali-activated and hybrid mortars manufactured from slag: Confocal Raman microscopy study and impact on wear performance 渣制碱活化砂浆和杂化砂浆的碳化:共聚焦拉曼显微镜研究及其对磨损性能的影响
IF 3.4 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2023-09-01 DOI: 10.1016/j.bsecv.2022.07.003
Segundo Shagñay, Asunción Bautista, Francisco Velasco, Manuel Torres-Carrasco

This work aims to contribute to reducing environmental damage caused by the manufacturing of Portland cements (PC), through in-depth exploration into the durability of two mortars manufactured from blast furnace slag: an alkaline-activated one (AAS) and a hybrid cement (HS) with less than 20% clinker. The carbonation resistance of these eco-friendly mortars is compared to that of a mortar based on Portland IV cement. From a mineralogical point of view, DTA-TG and confocal Raman microscopy (CRM) tests have been carried out, along with measurement of pH changes, compression strength and total porosity. Böhme tests have been performed to evaluate changes due to carbonation in the wear behavior of the mortars under study. Using the CRM technique, it has been possible to establish a relationship between the carbonation of the systems with the unbound carbon content, as well as identify the different polymorphic phases of CaCO3 formed. The results obtained reveal that alternative AAS and HS mortars are more difficult to carbonate than Portland cement mortars, and that the effect of this process on the porosity depends on the nature of the hydroxides previously present in the pore solution. The carbonation of the surfaces also improves the abrasive wear resistance of the mortars under study.

本研究旨在通过深入研究两种由高炉矿渣制成的砂浆(碱活化水泥(AAS)和含低于20%熟料的混合水泥(HS))的耐久性,为减少波特兰水泥(PC)的制造对环境造成的破坏做出贡献。这些环保砂浆的抗碳化性能与波特兰IV水泥砂浆进行了比较。从矿物学的角度来看,进行了DTA-TG和共聚焦拉曼显微镜(CRM)测试,以及pH变化、抗压强度和总孔隙度的测量。Böhme已经进行了试验,以评估所研究的砂浆的磨损行为因碳化而发生的变化。利用CRM技术,可以建立体系碳化与未结合碳含量之间的关系,并确定形成的CaCO3的不同多晶相。结果表明,替代AAS和HS砂浆比硅酸盐水泥砂浆更难碳酸盐化,并且该过程对孔隙率的影响取决于孔隙溶液中先前存在的氢氧化物的性质。表面碳化也提高了所研究砂浆的磨料耐磨性。
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引用次数: 2
Transformation of cuprite to tenorite through a martensitic-like type process in copper-doped glasses annealed in reduced atmosphere with the metal copper formation 掺铜玻璃在还原气氛下退火时,随着金属铜的形成,铜通过类似马氏体的过程转变为tenalite
4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2023-08-01 DOI: 10.1016/j.bsecv.2023.08.001
Safa Toumi, Alaa Adawy, Celia Marcos
The incorporation of copper nanoparticles into the glass matrix has attracted great interest in many fields due to their significant physical and chemical properties and their applications (e.g. opto-electronic and bio-medical tools). Several methodologies, such as the doping method and subsequent annealing of the glass in oxidizing and reducing atmospheres to synthesize copper nanoparticles in a glass are widely used. In this work, the doping method and subsequent annealing of the glass in a Ar/H2 atmosphere has been used. This treatment caused a martensitic-type transformation which, to our knowledge, has not been mentioned in the literature. The result was the transformation from cuprite to tenorite about 300 °C, and the presence of dispersed rounded and polyhedral copper nanoparticles and dendritic shapes of nanoparticles. The reaction of CuO and H2, between 250 and 300 °C, originated metallic copper particles. The mechanism of the martensitic-type transformation has been derived from the characterization results of copper-doped glasses annealed in reduced atmosphere by optical microscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy. The martensitic-like type structure could have imparted shape memory characteristics to the copper-doped glasses annealed in reduced atmosphere, opening a window for future research. La incorporación de nanopartículas de cobre en vidrio es de gran interés en muchos campos debido a sus importantes propiedades físicas y químicas y a sus aplicaciones (por ejemplo, optoelectrónica e instrumentos biomédicos). Metodologías para sintetizar nanopartículas de cobre en vidrio, como el dopaje y posterior recocido del vidrio en atmósferas oxidantes y reductoras, son ampliamente utilizadas. En este trabajo se ha utilizado este método en atmósfera Ar/H2. Este tratamiento provocó una transformación de tipo martensítico que, hasta donde sabemos, no se ha mencionado en la bibliografía. El resultado fue la transformación de cuprita a tenorita alrededor de 300 °C, y la presencia de nanopartículas de cobre dispersas redondeadas y poliédricas y de nanopartículas con formas dendríticas. La reacción de CuO y H2, entre 250-300 °C, originó partículas metálicas de cobre. El mecanismo de la transformación se ha establecido a partir de los resultados de la caracterización de los vidrios dopados con cobre recocidos en atmósfera reducida mediante microscopia óptica, espectroscopia de fotoelectrones de rayos X, microscopia electrónica de barrido y microscopia electrónica de transmisión. La estructura de tipo martensítico podría haber conferido características de memoria de forma a los vidrios dopados con cobre recocidos en atmósfera reducida, abriendo una ventana para futuras investigaciones.
由于铜纳米颗粒具有重要的物理和化学性质及其应用(例如光电和生物医学工具),因此将其掺入玻璃基质中引起了许多领域的极大兴趣。几种方法,如掺杂法和随后在氧化和还原气氛中对玻璃进行退火,以在玻璃中合成铜纳米颗粒被广泛使用。在这项工作中,使用了掺杂方法和随后在Ar/H2气氛中对玻璃进行退火。这种处理引起了马氏体型转变,据我们所知,在文献中没有提到过。结果表明,在300°C左右,铜颗粒由铜晶石转变为钛晶石,并存在分散的圆形和多面体铜纳米颗粒和枝晶状纳米颗粒。在250 ~ 300℃之间,CuO与H2反应生成金属铜颗粒。利用光学显微镜、x射线光电子能谱、扫描电镜和透射电镜等手段对还原气氛退火后的掺铜玻璃进行了表征,得出了马氏体型转变的机理。这种类马氏体结构可能赋予了在还原气氛下退火的掺铜玻璃形状记忆特性,为未来的研究打开了一扇窗。网址incorporación de nanopartículas de cobre en video es de gran intersamas en许多campos debido和sus importantes proprodes físicas y químicas通过sus applications (pere ejemplo, optoelectrónica e instrumentos biomacdios)。Metodologías para sinintetizar nanopartículas de cobre en vidrio, como el dopaje by posterior recocido del vidrio en atmósferas氧化剂通过还原剂,放大利用。他说:“我看到,我利用我的个人资料做了许多工作,例如atmósfera Ar/H2。Este tratamiento provocó una transformación de tipo martensítico que, hasta donde sabemos, no se ha mencionado en la bibliografía。在300°C的高温下,由于nanopartículas的存在,碳芯的分散和碳芯的扩散,以及nanopartículas的形成和dendríticas的形成,导致了结果的变化。La reacción de CuO y H2,中心250-300°C, originó partículas metálicas de cobre。El mechanismo de la transformación se as a partite de los resultados de la caracterización de los vidrios dopados con cobre recocidos en atmósfera还原介质显微镜óptica,光谱学de fotoelectronones de rayos X,显微镜electrónica de barrido y microscopia electrónica de transmisión。知识结构学martensítico podría haber conferido características关于知识的记忆学,关于知识的记忆学,关于知识的记忆学,关于知识的记忆学,关于知识的记忆学,关于知识的记忆学,关于知识的记忆学,关于知识的记忆学,关于知识的记忆学。
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Boletin de la Sociedad Espanola de Ceramica y Vidrio
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