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Corrigendum to “Mapping the effects of activator type and molarity on the rheology of alkali-activated slag using oscillation amplitude testing” [Open Ceramics, 25 (2026), 100920] “用振荡振幅测试绘制活化剂类型和摩尔浓度对碱活性渣流变性的影响”的勘误表[开放陶瓷,25 (2026),100920]
IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-03-01 Epub Date: 2026-02-20 DOI: 10.1016/j.oceram.2026.100927
David Markusík , Patrik Sokola , Vlastimil Bílek Jr
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引用次数: 0
A bone-like structure of alginate-hydroxyapatite 3D printed by laser-induced forward transfer 用激光诱导正向转移3D打印海藻酸羟基磷灰石的骨状结构
IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-03-01 Epub Date: 2025-12-17 DOI: 10.1016/j.oceram.2025.100898
M. Canillas , J. Navarro , A. Saiz , M.A. Rodríguez , M. Morales , S. Lauzurica , C. Molpeceres
Laser-Induced Forward Transfer (LIFT) is a widely used laser-based technique intended to print materials without modifying their properties. One of the main advantages of this transfer technique is that, properly setting the laser parameters and the structure of the donor substrate, materials with different rheology and even physical state can be printed, ranging from low viscosity newtonian fluids to solid state materials. On the other hand, Blister-Assisted Laser-Induced Forward Transfer (BA-LIFT) is a variant of the standard LIFT, wherein a polyimide layer is interposed between the donor substrate and the material to be printed. This configuration eliminates direct laser-material interaction, thereby mitigating photothermal degradation and, in particular in the case of bioinks containing living cells, preserving cell viability. In addition, as nozzle free technologies both avoid clogging problems when ceramic particles are added in the formulation. In this study, we optimized key parameters for the fabrication of three-dimensional scaffolds composed of alginate and tri-calcium phosphate (ALG–TCP) composites using BA-LIFT. The aim was to engineer bone-mimetic constructs capable of acting as extracellular matrices that support cell adhesion and proliferation. The formulation and curing process were tailored and studied to enhance crosslinking efficiency, improving overall biocompatibility while preserving the mechanical stability in the final structure, and minimizing aggressive conditions during the curing process, allowing good cell viability in case of use the formulation to design an ink within embedded living cells. This study demonstrates that a 0.1 M CaCl₂ solution is sufficient to induced effective gelation. Furthermore, the inclusion of TCP particles (20% wt) enhanced the gelation efficiency (75–95%) via surface-mediated release of Ca2+ ions.
激光诱导正向转移(LIFT)是一种广泛使用的基于激光的技术,旨在打印材料而不改变其特性。这种转移技术的主要优点之一是,适当设置激光参数和供体衬底的结构,可以打印从低粘度牛顿流体到固体材料等具有不同流变甚至物理状态的材料。另一方面,泡罩辅助激光诱导正向转移(BA-LIFT)是标准LIFT的一种变体,其中聚酰亚胺层被插入到供体衬底和待打印材料之间。这种结构消除了激光与材料的直接相互作用,从而减轻了光热降解,特别是在含有活细胞的生物墨水的情况下,保持了细胞的活力。此外,由于无喷嘴技术都避免堵塞问题时,陶瓷颗粒添加到配方。在本研究中,我们优化了BA-LIFT法制备海藻酸盐与磷酸三钙(ALG-TCP)复合材料三维支架的关键参数。目的是设计能够作为细胞外基质支持细胞粘附和增殖的骨模拟结构。对配方和固化工艺进行了量身定制和研究,以提高交联效率,提高整体生物相容性,同时保持最终结构的机械稳定性,并最大限度地减少固化过程中的侵蚀条件,从而在使用配方设计嵌入活细胞内的墨水时具有良好的细胞活力。本研究表明,0.1 M的氯化钙溶液足以诱导有效凝胶化。此外,TCP颗粒(20% wt)通过表面介导的Ca2+离子释放提高了凝胶效率(75-95%)。
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引用次数: 0
Influence of aggregate particle packing on the mechanical and microstructural properties of iron-rich laterite-based geopolymer concretes 骨料颗粒充填对富铁红土基地聚合物混凝土力学和微观结构性能的影响
IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-03-01 Epub Date: 2025-12-06 DOI: 10.1016/j.oceram.2025.100893
Rodrigue Cyriaque KAZE , Joseph MARAE DJOUDA , Benjamin Igor DJON LI NDJOCK , Abdolhossein NAGHIZADEH
This study investigated the effect of waste granite aggregate size on the fresh and hardened properties of high-performance concretes produced from iron-rich laterite calcined at 650°C. Three aggregate gradations of F1 (0-10 mm), F2 (0-6.5 mm), and F3 (0-5 mm), were incorporated into laterite-based geopolymer concretes and compared with Portland cement concretes produced under identical mix proportions. The activator-to-binder in geopolymer mixtures and water-to-cement ratio in Portland cement mixtures were fixed at 0.5, while the aggregate-to-binder ratio was kept constant at 2.95, regardless of the binder system. Fresh properties showed a moderate increase in slump when coarse fractions were excluded, rising from 15 to 18 mm in geopolymer mixtures and from 25 to 40 mm in Portland cement mixtures. Hardened concrete property evaluation revealed that mixtures made using F1 aggregates achieved the highest 28-day compressive strength values of 52.2 MPa for geopolymer and 48.1 MPa for Portland cement systems, along with lower porosity (10-11 %) and reduced water absorption (4.3-4.8 %). Conversely, mixes with finer F2 and F3 aggregates exhibited reduced strengths (34-45 MPa), higher porosity (14-16 %), and greater water absorption (6.5-7.2 %), confirming the detrimental effect of insufficient particle packing. Bulk density values ranged from 2230-2260 kg/m³ for mixtures containing F1 aggregate, which were higher than those of 2170 and 2200 kg/m³ for F2 and F3, respectively. Oven curing of geopolymer concretes at 60°C for 24 hours led to significant strength losses (20.3-26.6 MPa), due to rapid moisture loss and incomplete geopolymerization. Overall, the results highlight that particle size distribution plays a decisive role in optimising concrete performance, with F1 aggregates providing the most favourable balance of workability, density, and strength. The study further demonstrates the potential of thermally activated iron-rich laterite, an abundant but underutilised resource in tropical regions, combined with waste granite aggregates to produce sustainable concretes with properties comparable to Portland cement systems.
研究了废花岗岩骨料粒径对富铁红土650℃煅烧制备的高性能混凝土新鲜性能和硬化性能的影响。将F1 (0-10 mm)、F2 (0-6.5 mm)和F3 (0-5 mm)三种骨料级配掺入红土基地聚合物混凝土中,并与相同配合比下生产的波特兰水泥混凝土进行比较。无论采用何种粘结剂体系,地聚合物混合料的活化剂与粘结剂、硅酸盐水泥混合料的水灰比均固定为0.5,而骨料与粘结剂的比均保持恒定为2.95。当排除粗馏分时,新鲜性能显示出适度的坍落度增加,在地聚合物混合物中从15到18 mm增加,在波特兰水泥混合物中从25到40 mm增加。硬化混凝土性能评估显示,使用F1骨料制成的混合物达到了最高的28天抗压强度值,地聚合物为52.2 MPa,波特兰水泥体系为48.1 MPa,同时孔隙率(10- 11%)和吸水率(4.3- 4.8%)也降低了。相反,F2和F3团聚体较细的混合料强度降低(34-45 MPa),孔隙率提高(14- 16%),吸水率提高(6.5- 7.2%),证实了颗粒堆积不足的不利影响。F1骨料混合物的容重值为2230 ~ 2260 kg/m³,分别高于F2和F3的2170和2200 kg/m³。地聚合物混凝土在60°C下进行24小时的烘箱养护,由于水分流失迅速和地聚合物不完全,导致强度损失显著(20.3-26.6 MPa)。总体而言,结果强调粒径分布在优化混凝土性能方面起着决定性作用,F1骨料在和易性、密度和强度方面提供了最有利的平衡。该研究进一步证明了热活化富铁红土的潜力,这是热带地区丰富但未充分利用的资源,与废花岗岩骨料相结合,可以生产出具有与波特兰水泥系统相当性能的可持续混凝土。
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引用次数: 0
Porous SiOC microspheres obtained via photopolymerization-assisted solidification templating of emulsions 光聚合辅助固化模板乳剂制备多孔SiOC微球
IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-03-01 Epub Date: 2026-02-12 DOI: 10.1016/j.oceram.2026.100922
Katharina Rauchenwald , Romana Boubenicek , Elsa Traxler , Vanessa Treml , Thomas Konegger
Porous polysiloxane-derived SiOC microspheres were produced via photopolymerization-assisted solidification templating of preceramic polymer emulsions, demonstrated for four structure-directing solvents (cyclohexane, cyclooctane, l-menthol, camphene). Internal pore morphologies of microspheres correspond to those of the respective monolithic analogues. In addition to unidirectional solidification of emulsions, a novel method is introduced for selective solidification and photopolymerization of cyclooctane/polymer droplets within the liquid water phase, significantly improving process efficiency. Cryomicroscopy supported evaluation of solidification kinetics of oil/water phases. Stirring intensity was found to control microsphere size. For the stirred-tank setup, SiOC microspheres showed monomodal size distributions (d50 = 199 µm) and modal pore opening diameters of 5.2 µm. A proof-of-principle was delivered for implementation of this process in a continuous-flow solidification/photoreactor, providing a base for future upscaling. The open-porous SiOC microspheres are a promising materials concept for application in catalysis or adsorption.
通过光聚合辅助固化模板法制备了多孔聚硅氧烷衍生的SiOC微球,该微球适用于四种定向结构溶剂(环己烷、环辛烷、l-薄荷醇、莰烯)。微球的内部孔隙形态与各自的整体类似物相对应。除了乳液的单向凝固外,还介绍了一种在液态水相中选择性凝固和光聚合环辛烷/聚合物液滴的新方法,显著提高了工艺效率。低温显微镜支持评价油/水相的凝固动力学。搅拌强度对微球粒径有一定的控制作用。在搅拌槽装置中,SiOC微球呈单模态尺寸分布(d50 = 199µm),模态孔径为5.2µm。在连续流固化/光反应器中实现了该工艺的原理验证,为未来的升级提供了基础。开孔SiOC微球是一种很有前途的催化或吸附材料概念。
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引用次数: 0
Visible-light-activated Cu and Fe-doped TiO2 thin films on glass: photocatalytic, antibacterial and self-cleaning performance 玻璃上的可见光活化Cu和fe掺杂TiO2薄膜:光催化、抗菌和自清洁性能
IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-03-01 Epub Date: 2026-01-26 DOI: 10.1016/j.oceram.2026.100916
Ehsan Mehmandoustesfahani , Fatemeh Hakimi , Jorge Rodríguez-Chueca , José Antonio Díaz–López , Antonio Nieto–Márquez
In this study, TiO2 thin films doped with varying loadings of Cu and Fe (0.8, 1.5, 2.2, and 3.0 wt.%) were synthesized via sol–gel dip-coating onto glass substrates at room temperature. The structural and optical properties of the photocatalysts were characterized using X-ray diffraction and specific surface area analyses, field emission scanning electron microscopy (FE-SEM), photoluminescence and UV–Vis spectrophotometry.
Photocatalytic performance was evaluated through methylene blue (MB) degradation, water contact angle (WCA), and Escherichia coli inactivation under visible light. Doping TiO2 with Cu²⁺ and Fe³⁺ affected nanoparticle size and modified optical absorption, reducing the band gap. XRD confirmed anatase as the dominant crystalline phase for both pure and doped TiO2 calcined at 500 °C, with crystallite sizes of 11–30 nm.
Tauc plot analysis showed band gap narrowing from ∼3.20 eV for pure TiO2 to ∼2.65 eV for Fe–TiO2 and ∼2.40 eV for Cu–TiO2. Cu-doped TiO2 exhibited enhanced MB degradation at low dopant levels, but activity declined beyond 0.8% Cu, likely due to agglomeration. Fe-doped TiO2 showed progressive activity increases with higher dopant concentrations. Additionally, 0.8% Cu- and 3% Fe-doped TiO2 displayed greater hydrophilicity (WCA 9.8° and 18°, respectively) than pure TiO2 under visible light.
Comparing both dopants, 0.8% Cu-TiO2 achieved higher MB degradation than 3% Fe–TiO2. Antibacterial assays revealed that Cu–TiO2 had superior activity against Escherichia coli compared to pure and Fe-doped TiO2. The best levels for enhanced hydrophilicity and photocatalytic performance were identified as 0.8% Cu and 3.0% Fe, respectively.
在本研究中,在室温下通过溶胶-凝胶浸渍法在玻璃衬底上合成了不同Cu和Fe(0.8、1.5、2.2和3.0 wt.%)掺杂量的TiO2薄膜。采用x射线衍射和比表面积分析、场发射扫描电镜(FE-SEM)、光致发光和紫外可见分光光度法对光催化剂的结构和光学性能进行了表征。通过亚甲基蓝(MB)降解、水接触角(WCA)和大肠杆菌在可见光下的失活来评价光催化性能。用Cu²+和Fe³+掺杂TiO2影响了纳米颗粒的大小,修饰了光吸收,减小了带隙。XRD证实,500℃煅烧后的纯TiO2和掺杂TiO2均以锐钛矿为主晶相,晶粒尺寸在11 ~ 30 nm之间。tac图分析显示,纯TiO2的带隙从~ 3.20 eV缩小到Fe-TiO2的~ 2.65 eV和Cu-TiO2的~ 2.40 eV。Cu掺杂的TiO2在低掺杂水平下表现出对MB的增强降解,但超过0.8% Cu时活性下降,可能是由于团聚。fe掺杂TiO2的活性随掺杂浓度的增加而逐渐增加。此外,在可见光下,掺0.8% Cu和3% fe的TiO2比纯TiO2表现出更高的亲水性(WCA分别为9.8°和18°)。对比两种掺杂剂,0.8% Cu-TiO2比3% Fe-TiO2对MB的降解效果更好。抑菌实验表明,Cu-TiO2对大肠杆菌的抑菌活性优于纯TiO2和掺铁TiO2。提高亲水性和光催化性能的最佳水平分别为0.8% Cu和3.0% Fe。
{"title":"Visible-light-activated Cu and Fe-doped TiO2 thin films on glass: photocatalytic, antibacterial and self-cleaning performance","authors":"Ehsan Mehmandoustesfahani ,&nbsp;Fatemeh Hakimi ,&nbsp;Jorge Rodríguez-Chueca ,&nbsp;José Antonio Díaz–López ,&nbsp;Antonio Nieto–Márquez","doi":"10.1016/j.oceram.2026.100916","DOIUrl":"10.1016/j.oceram.2026.100916","url":null,"abstract":"<div><div>In this study, TiO<sub>2</sub> thin films doped with varying loadings of Cu and Fe (0.8, 1.5, 2.2, and 3.0 wt.%) were synthesized via sol–gel dip-coating onto glass substrates at room temperature. The structural and optical properties of the photocatalysts were characterized using X-ray diffraction and specific surface area analyses, field emission scanning electron microscopy (FE-SEM), photoluminescence and UV–Vis spectrophotometry.</div><div>Photocatalytic performance was evaluated through methylene blue (MB) degradation, water contact angle (WCA), and <em>Escherichia coli</em> inactivation under visible light. Doping TiO<sub>2</sub> with Cu²⁺ and Fe³⁺ affected nanoparticle size and modified optical absorption, reducing the band gap. XRD confirmed anatase as the dominant crystalline phase for both pure and doped TiO<sub>2</sub> calcined at 500 °C, with crystallite sizes of 11–30 nm.</div><div>Tauc plot analysis showed band gap narrowing from ∼3.20 eV for pure TiO<sub>2</sub> to ∼2.65 eV for Fe–TiO<sub>2</sub> and ∼2.40 eV for Cu–TiO<sub>2</sub>. Cu-doped TiO<sub>2</sub> exhibited enhanced MB degradation at low dopant levels, but activity declined beyond 0.8% Cu, likely due to agglomeration. Fe-doped TiO<sub>2</sub> showed progressive activity increases with higher dopant concentrations. Additionally, 0.8% Cu- and 3% Fe-doped TiO<sub>2</sub> displayed greater hydrophilicity (WCA 9.8° and 18°, respectively) than pure TiO<sub>2</sub> under visible light.</div><div>Comparing both dopants, 0.8% Cu-TiO<sub>2</sub> achieved higher MB degradation than 3% Fe–TiO<sub>2</sub>. Antibacterial assays revealed that Cu–TiO<sub>2</sub> had superior activity against <em>Escherichia coli</em> compared to pure and Fe-doped TiO<sub>2</sub>. The best levels for enhanced hydrophilicity and photocatalytic performance were identified as 0.8% Cu and 3.0% Fe, respectively.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"25 ","pages":"Article 100916"},"PeriodicalIF":2.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146173384","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}
引用次数: 0
Development and industrial testing of a novel stopper ring filter system for steel foundry applications 炼钢用新型塞环过滤系统的研制与工业试验
IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-03-01 Epub Date: 2026-02-12 DOI: 10.1016/j.oceram.2026.100921
Tony Wetzig , Jan-Hendrik Ziebarth , Florian Kerber , Kirsten Moritz , Tobias Dubberstein , Christos G. Aneziris
In the present study, ring filters were applied directly in a steel casting ladle for the first time. The carbon-bonded alumina filter system was fitted to the existing stopper system enabling steel melt filtration directly above the shroud without risk of filter blockage. Two identical casting trials were performed, whereby one resulted in successful retrieval of the filter and one resulted in filter failure. Analysis of cast steel samples regarding their inclusion population revealed that the filter failure did not impair the steel quality. The intact filter was analyzed via digital light microscopy, SEM/EDS and XRD. Contact zones revealed location-dependent morphological and chemical differences indicating inclusion removal and limited damage by slag contact. Overall, the investigation showed that the new principle is feasible and the risk due to filter failure is limited, which makes room for future casting trials to quantify the filtration efficiency and the impact of filter geometry.
本文首次将环形过滤器直接应用于铸钢钢包中。碳结合氧化铝过滤系统安装在现有的塞子系统上,使钢熔体过滤直接在罩体上方,没有过滤器堵塞的风险。进行了两次相同的铸造试验,其中一次成功地回收了过滤器,另一次导致过滤器失败。对铸钢试样夹杂物含量的分析表明,过滤器失效并不影响钢的质量。通过数码光镜、SEM/EDS、XRD等手段对滤光片进行分析。接触区显示出位置依赖的形态和化学差异,表明夹杂物的去除和有限的渣接触损伤。总体而言,研究表明,新原理是可行的,过滤器失效的风险是有限的,这为未来的铸造试验提供了空间,以量化过滤效率和过滤器几何形状的影响。
{"title":"Development and industrial testing of a novel stopper ring filter system for steel foundry applications","authors":"Tony Wetzig ,&nbsp;Jan-Hendrik Ziebarth ,&nbsp;Florian Kerber ,&nbsp;Kirsten Moritz ,&nbsp;Tobias Dubberstein ,&nbsp;Christos G. Aneziris","doi":"10.1016/j.oceram.2026.100921","DOIUrl":"10.1016/j.oceram.2026.100921","url":null,"abstract":"<div><div>In the present study, ring filters were applied directly in a steel casting ladle for the first time. The carbon-bonded alumina filter system was fitted to the existing stopper system enabling steel melt filtration directly above the shroud without risk of filter blockage. Two identical casting trials were performed, whereby one resulted in successful retrieval of the filter and one resulted in filter failure. Analysis of cast steel samples regarding their inclusion population revealed that the filter failure did not impair the steel quality. The intact filter was analyzed via digital light microscopy, SEM/EDS and XRD. Contact zones revealed location-dependent morphological and chemical differences indicating inclusion removal and limited damage by slag contact. Overall, the investigation showed that the new principle is feasible and the risk due to filter failure is limited, which makes room for future casting trials to quantify the filtration efficiency and the impact of filter geometry.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"25 ","pages":"Article 100921"},"PeriodicalIF":2.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146173459","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}
引用次数: 0
Coated beads and bead structures based on aluminium oxide and niobium using alginate gelation 海藻酸盐凝胶法制备氧化铝和铌涂层珠和珠结构
IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-03-01 Epub Date: 2026-02-04 DOI: 10.1016/j.oceram.2026.100919
M. Oppelt , T. Zienert , J. Hubálková , E. Storti , C.G. Aneziris
Spherical beads consisting of 70% Al2O3 and 30% niobium were produced using alginate gelation. The suspension for producing the beads contained sodium alginate as gelling agent and was added dropwise to a calcium chloride solution to serve as a solidifying agent. The beads were then coated with 100% Nb-slurry. After drying, the composite spheres were sintered in an inert atmosphere. The samples in green and sintered state were characterised using various testing methods and processed into bead structures. On the one hand, they were used as aggregates in casting slurry, whereby the matrix contained niobium in one case and pure Al2O3 in the other. In addition, the beads were bonded into structures using a Nb-matrix and isostatic pressing. After sintering, electrical resistance was measured to evaluate whether coupling is possible. It was found that a matrix of Al2O3 is sufficient for coupling, and thus the Nb-content can be significantly reduced.
采用海藻酸盐凝胶法制备了由70% Al2O3和30%铌组成的球形微珠。生产微球的悬浮液中含有海藻酸钠作为胶凝剂,并将其滴入氯化钙溶液中作为固化剂。然后用100% nb浆料包覆微珠。干燥后,复合球在惰性气氛中烧结。采用各种测试方法对绿态和烧结态试样进行表征,并将其加工成球头结构。一方面,它们作为集料在浇铸浆中使用,其中一种情况下基体中含有铌,另一种情况下含有纯Al2O3。此外,利用nb基质和等静压将珠子粘合成结构。烧结后,测量电阻以评估是否可能耦合。结果表明,Al2O3的基体足以进行耦合,从而显著降低了铌的含量。
{"title":"Coated beads and bead structures based on aluminium oxide and niobium using alginate gelation","authors":"M. Oppelt ,&nbsp;T. Zienert ,&nbsp;J. Hubálková ,&nbsp;E. Storti ,&nbsp;C.G. Aneziris","doi":"10.1016/j.oceram.2026.100919","DOIUrl":"10.1016/j.oceram.2026.100919","url":null,"abstract":"<div><div>Spherical beads consisting of 70% Al<sub>2</sub>O<sub>3</sub> and 30% niobium were produced using alginate gelation. The suspension for producing the beads contained sodium alginate as gelling agent and was added dropwise to a calcium chloride solution to serve as a solidifying agent. The beads were then coated with 100% Nb-slurry. After drying, the composite spheres were sintered in an inert atmosphere. The samples in green and sintered state were characterised using various testing methods and processed into bead structures. On the one hand, they were used as aggregates in casting slurry, whereby the matrix contained niobium in one case and pure Al<sub>2</sub>O<sub>3</sub> in the other. In addition, the beads were bonded into structures using a Nb-matrix and isostatic pressing. After sintering, electrical resistance was measured to evaluate whether coupling is possible. It was found that a matrix of Al<sub>2</sub>O<sub>3</sub> is sufficient for coupling, and thus the Nb-content can be significantly reduced.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"25 ","pages":"Article 100919"},"PeriodicalIF":2.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146173460","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}
引用次数: 0
Sintering temperature dependence on microstructure and electrical properties of Co2.38Mn1.62Fe1.6Zn0.4O8 ceramics for NTC thermistors 烧结温度对Co2.38Mn1.62Fe1.6Zn0.4O8 NTC热敏电阻显微结构和电性能的影响
IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-03-01 Epub Date: 2025-12-06 DOI: 10.1016/j.oceram.2025.100894
Jinghao Rong, Tingqing Cai, Haichao Li, Shuai Wang, Jiayao Zhang, LiangKui Peng, Shizhao Liu
Co–Mn–Fe–Zn–O-based ceramics are important negative temperature coefficient (NTC) materials. To clarify the processing-property relationship, Co₂.₃₈Mn₁.₆₂Fe₁.₆Zn₀.₄O₈ ceramics were prepared via the solid-state method, and the effects of sintering temperature (1100–1300°C) on their microstructure, electrical properties, and aging behavior were systematically investigated. XRD and SEM analyses revealed that higher temperatures promoted grain growth and densification, with the average grain size increasing from 1.6 μm to 5.3 μm. The room-temperature resistivity (ρ₂₅) exhibited a non-monotonic trend, initially increasing from 3327 Ω·cm at 1100°C to a maximum of 4287 Ω·cm at 1250°C, then decreasing to 3020 Ω·cm at 1300°C. XPS analysis indicated that the Mn³⁺/Mn⁴⁺ ratio decreased monotonically from 99.5% to 65.4% with increasing sintering temperature. This suggests that the resistivity evolution is governed by a transition in the dominant mechanism: small polaron hopping between Mn³⁺ and Mn⁴⁺ ions at lower temperatures (≤1250°C), and grain boundary scattering due to significant grain growth at higher temperatures (≥1250°C). Furthermore, all samples demonstrated excellent aging stability with a resistance drift (ΔR/R) below 0.20% over 800 hours, with the sample sintered at 1250°C achieving the optimal combination of high resistivity (4287 Ω·cm) and minimal drift (0.16%), attributable to its dense microstructure and balanced cation valence. This work provides valuable insights for optimizing the sintering process of NTC ceramics to achieve superior electrical performance and long-term stability.
co - mn - fe - zn基陶瓷是一种重要的负温度系数材料。为明确加工性质关系,Co₂.₃₈Mn₁.₆Fe₁.₆Zn₀。采用固相法制备了₄O₈陶瓷,系统研究了烧结温度(1100 ~ 1300℃)对其微观结构、电学性能和时效性能的影响。XRD和SEM分析表明,高温促进了晶粒的生长和致密化,平均晶粒尺寸从1.6 μm增加到5.3 μm。室温电阻率(ρ₂₅)呈现非单调趋势,最初从1100℃时的3327 Ω·cm增加到1250℃时的最大值4287 Ω·cm,然后在1300℃时下降到3020 Ω·cm。XPS分析表明,随着烧结温度的升高,Mn³+ /Mn⁴+的比值从99.5%单调下降到65.4%。这表明电阻率的演化受主导机制的转变支配:在较低温度(≤1250°C)下,Mn³+和Mn⁴+离子之间存在较小的极化子跳变,在较高温度(≥1250°C)下,晶粒生长导致晶界散射。此外,所有样品在800小时内均表现出优异的时效稳定性,电阻漂移(ΔR/R)低于0.20%,其中1250℃烧结的样品由于其致密的微观结构和平衡的阳离子价,实现了高电阻率(4287 Ω·cm)和最小漂移(0.16%)的最佳组合。这项工作为优化NTC陶瓷的烧结工艺以获得优异的电性能和长期稳定性提供了有价值的见解。
{"title":"Sintering temperature dependence on microstructure and electrical properties of Co2.38Mn1.62Fe1.6Zn0.4O8 ceramics for NTC thermistors","authors":"Jinghao Rong,&nbsp;Tingqing Cai,&nbsp;Haichao Li,&nbsp;Shuai Wang,&nbsp;Jiayao Zhang,&nbsp;LiangKui Peng,&nbsp;Shizhao Liu","doi":"10.1016/j.oceram.2025.100894","DOIUrl":"10.1016/j.oceram.2025.100894","url":null,"abstract":"<div><div>Co–Mn–Fe–Zn–O-based ceramics are important negative temperature coefficient (NTC) materials. To clarify the processing-property relationship, Co₂.₃₈Mn₁.₆₂Fe₁.₆Zn₀.₄O₈ ceramics were prepared via the solid-state method, and the effects of sintering temperature (1100–1300°C) on their microstructure, electrical properties, and aging behavior were systematically investigated. XRD and SEM analyses revealed that higher temperatures promoted grain growth and densification, with the average grain size increasing from 1.6 μm to 5.3 μm. The room-temperature resistivity (ρ₂₅) exhibited a non-monotonic trend, initially increasing from 3327 Ω·cm at 1100°C to a maximum of 4287 Ω·cm at 1250°C, then decreasing to 3020 Ω·cm at 1300°C. XPS analysis indicated that the Mn³⁺/Mn⁴⁺ ratio decreased monotonically from 99.5% to 65.4% with increasing sintering temperature. This suggests that the resistivity evolution is governed by a transition in the dominant mechanism: small polaron hopping between Mn³⁺ and Mn⁴⁺ ions at lower temperatures (≤1250°C), and grain boundary scattering due to significant grain growth at higher temperatures (≥1250°C). Furthermore, all samples demonstrated excellent aging stability with a resistance drift (ΔR/R) below 0.20% over 800 hours, with the sample sintered at 1250°C achieving the optimal combination of high resistivity (4287 Ω·cm) and minimal drift (0.16%), attributable to its dense microstructure and balanced cation valence. This work provides valuable insights for optimizing the sintering process of NTC ceramics to achieve superior electrical performance and long-term stability.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"25 ","pages":"Article 100894"},"PeriodicalIF":2.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145839987","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}
引用次数: 0
Editorial for the Special Issue “Young Ceramists Leading the Future” 《青年陶艺家引领未来》特刊社论
IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-03-01 Epub Date: 2026-01-17 DOI: 10.1016/j.oceram.2026.100912
Nicolas Somers , Erkka Frankberg , David Karl , Giorgia Franchin , Awais Qadir , Soňa Hříbalová , Andrea Zocca , Danica Piper , Alejandro Monton Zarazaga
{"title":"Editorial for the Special Issue “Young Ceramists Leading the Future”","authors":"Nicolas Somers ,&nbsp;Erkka Frankberg ,&nbsp;David Karl ,&nbsp;Giorgia Franchin ,&nbsp;Awais Qadir ,&nbsp;Soňa Hříbalová ,&nbsp;Andrea Zocca ,&nbsp;Danica Piper ,&nbsp;Alejandro Monton Zarazaga","doi":"10.1016/j.oceram.2026.100912","DOIUrl":"10.1016/j.oceram.2026.100912","url":null,"abstract":"","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"25 ","pages":"Article 100912"},"PeriodicalIF":2.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023052","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}
引用次数: 0
Simultaneous effects of firing temperatures and porogenic agent type on properties of low-cost ceramic membranes: Application in the treatment of pretreated and non-pretreated wastewater by brewery WWTP 烧制温度和致气孔剂类型对低成本陶瓷膜性能的同时影响:在啤酒污水处理厂预处理和未预处理废水处理中的应用
IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2025-12-01 Epub Date: 2025-09-25 DOI: 10.1016/j.oceram.2025.100854
Kouotou Mfomboum Yacouba , NJindam Oumar Ramadan , Pountouenchi Amdou , Mountapbeme Ibrahim Cherif , Njoya André , Gisèle Laure Lecomte–Nana , Njoya Dayirou
This work focuses on the study of membrane properties with increasing temperature and their efficiency in wastewater treatment pretreated and non- pretreated by the Brewery Wastewater Treatment Plant (WWTP) in Yaounde. The raw materials and ceramic membranes were characterized. The M3, M8 and M13 formulations were sintered at 1050, 1100 and 1150 °C. The M8 membrane containing MSS pore-forming agents obtained at 1100 °C was more satisfactory in terms of its high porosity of 53.64 %, its hydraulic permeability of 298.59 L.h-1m-2bar-1 and its pore diameter of 0.096 µm. It has produced impressive results with 97.88 % and 98 % of COD; 96.96 % and 97.60 % of BOD5; 89.71 % and 88.16 % of suspended solids; 90.21 % and 90.65 % of turbidity values respectively for the non-pretreated and pretreated samples. This research has developed new ceramic membranes, offering potential solutions to the challenges of organic waste management and industrial wastewater treatment.
本文主要研究了雅温得啤酒废水处理厂(WWTP)预处理和非预处理后膜的温度变化及其处理效率。对原料和陶瓷膜进行了表征。M3、M8和M13配方分别在1050、1100和1150℃下烧结。1100℃条件下制备的含MSS成孔剂的M8膜孔隙率为53.64%,水力渗透率为298.59 l - h-1m-2bar-1,孔径为0.096µm。COD去除率分别为97.88%和98%,效果显著;BOD5分别为96.96%和97.60%;悬浮物含量分别为89.71%和88.16%;未预处理和预处理样品的浊度值分别为90.21%和90.65%。该研究开发了新型陶瓷膜,为有机废物管理和工业废水处理的挑战提供了潜在的解决方案。
{"title":"Simultaneous effects of firing temperatures and porogenic agent type on properties of low-cost ceramic membranes: Application in the treatment of pretreated and non-pretreated wastewater by brewery WWTP","authors":"Kouotou Mfomboum Yacouba ,&nbsp;NJindam Oumar Ramadan ,&nbsp;Pountouenchi Amdou ,&nbsp;Mountapbeme Ibrahim Cherif ,&nbsp;Njoya André ,&nbsp;Gisèle Laure Lecomte–Nana ,&nbsp;Njoya Dayirou","doi":"10.1016/j.oceram.2025.100854","DOIUrl":"10.1016/j.oceram.2025.100854","url":null,"abstract":"<div><div>This work focuses on the study of membrane properties with increasing temperature and their efficiency in wastewater treatment pretreated and non- pretreated by the Brewery Wastewater Treatment Plant (WWTP) in Yaounde. The raw materials and ceramic membranes were characterized. The M3, M8 and M13 formulations were sintered at 1050, 1100 and 1150 °C. The M8 membrane containing MSS pore-forming agents obtained at 1100 °C was more satisfactory in terms of its high porosity of 53.64 %, its hydraulic permeability of 298.59 L.h<sup>-1</sup>m<sup>-2</sup>bar<sup>-1</sup> and its pore diameter of 0.096 µm. It has produced impressive results with 97.88 % and 98 % of COD; 96.96 % and 97.60 % of BOD<sub>5</sub>; 89.71 % and 88.16 % of suspended solids; 90.21 % and 90.65 % of turbidity values respectively for the non-pretreated and pretreated samples. This research has developed new ceramic membranes, offering potential solutions to the challenges of organic waste management and industrial wastewater treatment.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"24 ","pages":"Article 100854"},"PeriodicalIF":2.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145324756","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}
引用次数: 0
期刊
Open Ceramics
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