Ceramics International最新文献_第7页

B-site Cu-doped PrBa0.5Sr0.5Co2O5+δ as novel low temperature-solid oxide fuel cells cathodes with reduced thermal expansion coefficient and enhanced oxygen-ion diffusion b位cu掺杂PrBa0.5Sr0.5Co2O5+δ作为低温固体氧化物燃料电池阴极，具有降低热膨胀系数和增强氧离子扩散的特点

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-19 DOI: 10.1016/j.ceramint.2026.01.233

Weihua Jia , Yuqi Wang , Jianbing Huang , Yunting Hou , Sinan Guan , Le Wu , Lan Zheng , Lei Ge

PrBa_0.5Sr_0.5Co₂O_5+δ (PBSC) has attracted considerable attention as a layered perovskite cathode for solid oxide fuel cells (SOFCs) due to its favorable electrochemical properties, while also holds significant potential for modification into an efficient low-temperature cathode. However, its high thermal expansion coefficient and sluggish oxygen-ion diffusion remain critical challenges for achieving stable operation of SOFCs at reduced temperatures (below 650 °C). To overcome these limitations, we employe first-principles calculations to screen the suitable B-site dopants (M = Fe, Ni, Cu) for PBSC, aiming to optimize its structural and electrochemical characteristics. Guided by these theoretical insights, a series of PrBa0_.5Sr_0.5Co_2-xCu_xO_5+δ (x = 0, 0.5, 1.0) cathode materials were synthesized and systematically investigated with respect to their phase structure, elemental valence states, thermogravimetric properties, and microstructure. Among the tested dopants, Cu substitution proves to be the most effective in enhancing the electrochemical performance of PBSCCx cathodes, owing to the rigid Cu-O coordination and suppressed Co redox that limit lattice expansion, progressive lattice contraction upon Cu incorporation, and enriched oxygen vacancies that facilitate oxygen ion transport. Consequently, the PBSCC1.0 cathode manifests a more than 24 % reduction in thermal expansion coefficient, a 29 % decrease in polarization resistance, and an 8 % drop in activation energy compared to undoped PBSC, highlighting the effectiveness of Cu doping in optimizing cathode properties. Furthermore, the single cell employing PBSCC1.0 cathode could achieve a peak power density of 0.222 W

\cdot

cm⁻² at 650 °C, representing an evident enhancement of over 149 % compared to undoped PBSC under the identical conditions.

由于其良好的电化学性能，PrBa0.5Sr0.5Co2O5+δ (PBSC)作为固体氧化物燃料电池（sofc）的层状钙钛矿阴极受到了广泛的关注，同时也有很大的潜力被改性成高效的低温阴极。然而，其高热膨胀系数和缓慢的氧离子扩散仍然是实现sofc在低温（低于650℃）下稳定运行的关键挑战。为了克服这些限制，我们采用第一性原理计算筛选适合PBSC的b位掺杂剂（M = Fe, Ni, Cu），旨在优化其结构和电化学特性。在这些理论见解的指导下，合成了一系列PrBa0.5Sr0.5Co2-xCuxO5+δ (x = 0,0.5, 1.0)正极材料，并对其相结构、元素价态、热重性能和微观结构进行了系统的研究。在测试的掺杂剂中，Cu取代被证明是提高PBSCCx阴极电化学性能最有效的，因为Cu- o的刚性配位和抑制Co氧化还原限制了晶格膨胀，Cu掺入后晶格逐渐收缩，并且富集了氧空位，促进了氧离子的传输。因此，与未掺杂的PBSC相比，PBSCC1.0阴极的热膨胀系数降低了24%以上，极化电阻降低了29%，活化能降低了8%，突出了Cu掺杂在优化阴极性能方面的有效性。此外，采用PBSCC1.0阴极的单电池在650°C下的峰值功率密度为0.222 W·cm - 2，与未掺杂的PBSC相比，在相同条件下提高了149%以上。

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引用次数: 0

Controlled microstructure, thermal and mechanical property anisotropy of binder jetting 3D-printed SiC ceramics by reaction bonding 反应键合控制粘结剂喷射3d打印SiC陶瓷的微观结构、热性能和力学性能各向异性

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-19 DOI: 10.1016/j.ceramint.2026.01.234

Xiaotong Chen, Xiong Gao, Wenqing Wang, Rujie He

This study explores the anisotropy in SiC ceramics fabricated by Binder Jetting (BJ) 3D printing. BJ-3D printing forms complex SiC shapes but introduces interlayer defects, causing anisotropy. SiC green bodies were printed in various directions, and their mechanical properties were tested. The green bodies built parallel to the printing direction had the highest flexural strength, while other directions showed a 40 % – 53 % reduction. After reaction bonding and sintering, the anisotropy decreased significantly. The flexural strength of samples built parallel to the printing direction was 229.36 MPa, with other directions showing only a 7 % – 14 % reduction. The anisotropy evaluation index (σ₀/σ_x) decreased from 2.13 to 1.09 after reaction bonding. Thermal properties of sintered SiC in different directions showed no significant differences. Reaction bonding effectively reduces anisotropy, providing valuable insights for BJ-3D printed SiC ceramics.

本研究探讨了粘结剂喷射（BJ） 3D打印制备的SiC陶瓷的各向异性。BJ-3D打印形成了复杂的碳化硅形状，但引入了层间缺陷，导致各向异性。对SiC绿体进行了不同方向的印刷，并对其力学性能进行了测试。与印刷方向平行的绿色体具有最高的抗弯强度，而其他方向的抗弯强度降低了40% - 53%。反应键合和烧结后，各向异性显著降低。与印刷方向平行的样品抗弯强度为229.36 MPa，其他方向仅降低7% ~ 14%。反应成键后，各向异性评价指标（σ0/σx）由2.13降至1.09。不同方向烧结SiC的热性能差异不显著。反应键合有效地降低了各向异性，为BJ-3D打印SiC陶瓷提供了有价值的见解。

引用次数: 0

Molten salt synthesis and infrared radiation properties of narrow-bandgap layered perovskite La2CuO4 窄带隙层状钙钛矿La2CuO4的熔盐合成及红外辐射性能

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2025-12-29 DOI: 10.1016/j.ceramint.2025.12.463

Hao Chen , Hao Wang , Jianjie Tang , Dong Xu , Hao Bai

Materials with high-infrared emissivity in the 3–5 μm and 8–14 μm atmospheric windows are critical for enhancing the thermal efficiency of industrial furnaces and heating systems, contributing to the energy savings. However, current materials often underperform in terms of emissivity, anti-attenuation properties, and overall effectiveness in these windows, falling short of modern energy-saving requirements. Thus, the development of high-performance materials with optimal emissivity and robust anti-attenuation capabilities is essential for energy-efficient heating equipment. In this regard, a Ruddlesden-Popper perovskite-type material, La₂CuO₄, was synthesized via the molten salt method. This material demonstrates exceptional infrared radiation performance across both the 3–5 μm and 8–14 μm bands, with emissivity values of 0.987 and 0.998, respectively, for the sample synthesized at 900 °C. After exposure to 10 h at 1200 °C, the emissivity remained high at 0.983 (3–5 μm) and 0.988 (8–14 μm). The synthesis temperature significantly impacts the infrared emissivity of La₂CuO₄. Higher synthesis temperatures increase oxygen vacancy concentrations, narrowing the bandgap and enhancing emissivity in the 3–5 μm range. However, the Burstein-Moss effect, which arises from high carrier concentrations, widens the bandgap and reduces emissivity when synthesis temperatures exceed 900 °C. Additionally, elevated synthesis temperatures intensify lattice vibrations, improving radiative performance in the 8–14 μm range, although excessively high temperatures can increase electrical conductivity, potentially reducing emissivity. Notably, La₂CuO₄ coatings retained an emissivity greater than 0.9 after undergoing 10 thermal shock cycles at 1000 °C. This study provides a theoretical foundation for the development of advanced infrared radiation materials.

在3-5 μm和8-14 μm大气窗口中具有高红外发射率的材料对于提高工业炉和加热系统的热效率和节能至关重要。然而，目前的材料在这些窗户的发射率、抗衰减性能和整体效率方面往往表现不佳，达不到现代节能要求。因此，开发具有最佳发射率和强大抗衰减能力的高性能材料对于节能加热设备至关重要。为此，采用熔盐法合成了一种Ruddlesden-Popper钙钛矿型材料La2CuO4。该材料在3-5 μm和8-14 μm波段均表现出优异的红外辐射性能，在900℃下合成的样品的发射率分别为0.987和0.998。在1200℃下辐照10 h后，发射率保持较高，分别为0.983 （3-5 μm）和0.988 （8-14 μm）。合成温度对La2CuO4的红外发射率有显著影响。较高的合成温度增加了氧空位浓度，缩小了带隙，提高了3 ~ 5 μm范围内的发射率。然而，当合成温度超过900°C时，由高载流子浓度引起的Burstein-Moss效应会使带隙变宽并降低发射率。此外，升高的合成温度加剧了晶格振动，改善了8-14 μm范围内的辐射性能，尽管过高的温度会增加电导率，潜在地降低发射率。值得注意的是，在1000℃下经历10次热冲击循环后，La2CuO4涂层的发射率仍大于0.9。该研究为开发先进的红外辐射材料提供了理论基础。

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引用次数: 0

Design of rare earth free hard magnetic and microwave absorbing Sr hexaferrite nanoparticles via ionic substitution strategy 离子取代法设计无稀土硬磁微波吸收锶六铁氧体纳米粒子

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-02 DOI: 10.1016/j.ceramint.2025.12.493

Rashmi A. Thite , Manisha R. Patil , Akash V. Fulari , Y.S. Madansure , Sagar E. Shirsath , R.H. Kadam

In this study, Cr³⁺ and Al³⁺ co-substituted M-type hexaferrites with the general formula SrFe_12-2xCr_xAl_xO₁₉ (x = 0.0–0.4) were synthesized via the sol–gel auto-combustion method and sintered at 1200 °C to investigate their structural, microstructural, magnetic, dielectric, and microwave absorption properties. X-ray diffraction confirmed the formation of a single-phase magnetoplumbite structure for all compositions, with a systematic lattice contraction attributed to the incorporation of smaller Cr³⁺ and Al³⁺ ions. Scanning and transmission electron microscopy revealed refined grain morphology, enhanced densification, and high crystallinity upon substitution. Magnetic measurements showed a reduction in saturation magnetization with a concurrent increase in coercivity, reaching a maximum of 9788 Oe at x = 0.4, indicating improved magneto-anisotropic behavior. Notably, the sample with x = 0.2 exhibited the most effective microwave absorption (−32.2 dB), achieving optimal impedance matching and broad bandwidth due to the balanced contribution of dielectric and magnetic loss mechanisms. Impedance spectroscopy and dielectric analyses further demonstrated enhanced conductivity, reduced loss tangent, and improved polarization dynamics with substitution. These results position Cr–Al co-substituted SrFe₁₂O₁₉, as a promising multifunctional material for applications in permanent magnet, electromagnetic interference (EMI) shielding, and microwave absorption systems.

本研究采用溶胶-凝胶自燃烧法合成了通式为SrFe12-2xCrxAlxO19 （x = 0 ~ 0.4）的Cr3+和Al3+共取代m型六铁体，并在1200℃下烧结，研究了其结构、微观结构、磁性、介电性和微波吸收性能。x射线衍射证实了所有成分都形成了单相磁铅石结构，由于较小的Cr3+和Al3+离子的加入，形成了系统的晶格收缩。扫描电镜和透射电镜显示，取代后晶粒形态变细，致密化增强，结晶度高。磁性测量表明，饱和磁化强度降低，矫顽力同时增加，在x = 0.4时达到最大值9788 Oe，表明磁各向异性行为得到改善。值得注意的是，x = 0.2的样品表现出最有效的微波吸收（- 32.2 dB），由于介电损耗和磁损耗机制的平衡贡献，实现了最佳的阻抗匹配和宽带。阻抗谱和介电分析进一步证明了替代增强了电导率，降低了正切损耗，并改善了极化动力学。这些结果表明，Cr-Al共取代SrFe12O19是一种很有前途的多功能材料，可用于永磁、电磁干扰屏蔽和微波吸收系统。

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引用次数: 0

Toward 3D printed “vascular ceramics” with vat photopolymerization: Determining the minimum printable open channel size 用还原光聚合技术3D打印“血管陶瓷”：确定最小可打印的开放通道尺寸

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2025-12-31 DOI: 10.1016/j.ceramint.2025.12.495

Zachary Alsup , Mohaimenul Hasan , Sudip Kumar Sarkar , Moein Khakzad , Zahra Sepasi , Narendra B. Dahotre , Majid Minary-Jolandan

Ceramic components with embedded internal channels—termed “vascular ceramics”—enable active cooling, fluid transport, and multifunctional performance in extreme environments where polymers and metals fail. Digital light processing (DLP) stereolithography is a promising route for fabricating such architectures, yet reliably printing fine, fully enclosed channels is often limited by lateral overcure, light scattering, and sintering shrinkage. We present a systematic framework to both determine the minimum printable open channel size and correct geometric tapering in DLP-printed ceramics. By varying cure depth-to-layer height ratios, we found that shallower cures produced smaller open channels—down to 0.6 mm—by reducing lateral overgrowth, whereas deeper cures required larger diameters to remain open after sintering. Across all sizes, channels exhibited a repeatable symmetric taper (∼10–15 % narrowing at mid-length). Using this profile, we inverse-designed pre-compensated geometries that printed with <3 % deviation from the target diameter. These results provide quantitative guidelines for exposure selection to preserve fine feature openness and introduce a generalizable geometric correction method. Together, they enable more predictable design of vascular ceramic architectures for high-temperature heat exchangers, catalytic reactors, and biomedical implants.

具有嵌入式内部通道的陶瓷组件-称为“血管陶瓷”-在聚合物和金属失效的极端环境中实现主动冷却，流体输送和多功能性能。数字光处理（DLP）立体光刻是制造这种结构的一种很有前途的途径，但是可靠地打印精细、全封闭的通道通常受到横向过固化、光散射和烧结收缩的限制。我们提出了一个系统的框架来确定最小可打印的开通道尺寸和正确的几何锥度在dlp印刷陶瓷。通过改变固化深度-层高比，我们发现较浅的固化产生更小的开放通道（低至0.6 mm），从而减少了横向过度生长，而较深的固化在烧结后需要更大的直径来保持开放。在所有尺寸中，通道都表现出可重复的对称锥度（在中长度处缩小~ 10 - 15%）。使用该轮廓，我们反设计了与目标直径偏差3%的预补偿几何形状。这些结果为曝光选择提供了定量指导，以保持良好的特征开放性，并引入了一种可推广的几何校正方法。它们共同为高温热交换器、催化反应器和生物医学植入物的血管陶瓷结构设计提供了更可预测的设计。

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引用次数: 0

Synthesis of intrinsically magnetic MBene via molten salt etching of Mn2AlB2 熔融盐蚀刻法合成本征磁性MBene

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.490

Ying Wang , Xiaofeng Zhao , Ying Yu , Xiang Gao , Chunpeng Ai

As emerging nanomaterials, MBenes (two-dimensional transition metal borides) have attracted increasing attention, but synthesis strategies still face limitations. In this study, MnB MBene was successfully synthesized via molten salt etching of the Mn₂AlB₂ precursor, with a systematic investigation of the effects of etching conditions on the etched products. Characterization revealed that under optimal conditions (a Mn₂AlB₂ to ZnCl₂ molar ratio of 1:2, etching temperature of 650 °C, and etching time of 4 h), the products exhibited high crystallinity and a well-defined thin-layer nanosheet structure. Furthermore, the intrinsic magnetism of the MnB MBene was investigated through macroscopic magnetic response and hysteresis loop analysis. Macroscopically, the MnB MBene powder demonstrates clear magnetism, as it is visibly attracted to a permanent magnet. The hysteresis loop analysis shows that the MnB MBene has a saturation magnetization of 42 emu/g and a coercivity of 228 Oe at room temperature. Moreover, temperature-dependent hysteresis loop measurements revealed that both saturation magnetization and coercivity decrease with increasing temperature, while the MnB MBene retains its magnetism even at 400 K.

MBenes（二维过渡金属硼化物）作为新兴的纳米材料越来越受到人们的关注，但其合成策略仍存在局限性。在本研究中，通过熔盐蚀刻Mn2AlB2前驱体成功合成了MnB MBene，并系统地研究了蚀刻条件对蚀刻产物的影响。表征表明，在最佳条件下（Mn2AlB2与ZnCl2的摩尔比为1:2，刻蚀温度为650℃，刻蚀时间为4 h），产物具有较高的结晶度和良好的薄层纳米片结构。通过宏观磁响应和磁滞回线分析，研究了MnB - MBene的本征磁性。宏观上看，MnB MBene粉末表现出明显的磁性，因为它明显地被永磁体吸引。磁滞回线分析表明，MnB MBene在室温下的饱和磁化强度为42 emu/g，矫顽力为228 Oe。此外，温度相关的磁滞回线测量表明，饱和磁化强度和矫顽力随温度升高而降低，而MnB MBene即使在400k时仍保持其磁性。

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引用次数: 0

Sol-gel coatings prepared by dip coating method with admixture of β-TCP and CaTiO3 powders: Influence of relative ratio and grain size of powders on coating surface properties and hydroxyapatite formation β-TCP与CaTiO3粉末混合浸涂法制备溶胶-凝胶涂层：粉末相对比和粒径对涂层表面性能和羟基磷灰石形成的影响

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-07 DOI: 10.1016/j.ceramint.2025.12.497

Zuzana Budinská , Zdenek Tolde , Diana Horkavcová , Jan Drahokoupil

In this work, new sol-gel layers were prepared with the addition of different weight ratios of CaTiO₃ and β-TCP powders with different grain sizes. An analysis of the influence of concentration and grain size on the properties and bioactivity of the coated samples is presented. Polished titanium was used as the substrate, and the layers were prepared by dip coating, where CaTiO₃ powders were mixed into the titanium sol-gel mixture in combination with coarse TCP and fine TCP powders in weight ratios of 1g+4g, 2.5g + 2.5g, and 4g+1g. Before immersing the samples in simulated body fluid (SBF), SEM, EDS, and XRD analyses were performed, and the wettability and adhesion of the coatings were measured. The samples were then left in SBF for 21 days, with the solution being changed every 7 days, and these characteristics were measured again. The influence of the powder concentration in the sol-gel and the grain size on the growth and thickness of the hydroxyapatite layer was confirmed. After evaluating all the results, the best sample was found to be the “half and half” sample, where 2.5 g of CaTiO₃ powder and 2.5 g of fine β-TCP powder were mixed into the sol-gel. CaTiO₃ powder increases the polar component of surface energy and improves the wettability of the coating, while TCP powder provides the necessary phosphorus. The amount of calcium and phosphorus must be properly balanced, as certain combinations did not result in hydroxyapatite growth in SBF. Thanks to the relatively easy coating method and excellent bioactive properties, these new composite coatings have the potential for use in the field of biomaterials.

在本工作中，通过添加不同重量比的CaTiO3和不同粒径的β-TCP粉末制备了新的溶胶-凝胶层。分析了浓度和粒径对包覆样品性质和生物活性的影响。以抛光后的钛为基材，采用浸涂法制备涂层，将CaTiO3粉末与粗、细TCP粉末按1g+4g、2.5g + 2.5g、4g+1g的重量比例混合到钛溶胶-凝胶混合物中。将样品浸泡在模拟体液（SBF）中，进行SEM、EDS和XRD分析，并测量涂层的润湿性和附着力。然后将样品放置在SBF中21天，每7天更换一次溶液，再次测量这些特征。证实了溶胶-凝胶中粉末浓度和颗粒尺寸对羟基磷灰石层生长和厚度的影响。通过对所有结果的评价，我们发现最好的样品是“对半”样品，即在溶胶-凝胶中加入2.5 g CaTiO3粉末和2.5 g细β-TCP粉末。CaTiO3粉末增加了表面能的极性组分，改善了涂层的润湿性，而TCP粉末则提供了必需的磷。钙和磷的量必须适当平衡，因为某些组合不会导致SBF中羟基磷灰石的生长。由于其相对简单的涂层方法和优异的生物活性，这些新型复合涂层在生物材料领域具有潜在的应用前景。

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引用次数: 0

Chelating agent-driven modulation of thermal, structural and magnetic properties in sol-gel synthesized zinc ferrite nanoparticles 螯合剂驱动的溶胶-凝胶合成铁酸锌纳米颗粒的热、结构和磁性能调制

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-14 DOI: 10.1016/j.ceramint.2025.12.511

Rohit Shendkar , Jayant Yadav , Akshay Vyas , Mandar Shirolkar , Yogesh Patil

Nanocrystalline zinc ferrite (ZnFe₂O₄) nanoparticles were synthesized via sol-gel method using tartaric acid, citric acid, and glycine as chelating agents. Thermogravimetric analysis confirmed phase formation at ∼400 °C. The enthalpy of formation (ΔH) and average number of capping molecules per nanoparticle (N) were estimated. Rietveld refinement of X-ray diffraction data revealed lattice parameter variation, with tartaric acid-derived samples exhibiting the highest value (a = 8.441 Å) and an average crystallite size of ∼22 nm. Raman spectroscopy confirmed phase purity, while X-ray photoelectron spectroscopy indicated fuel-dependent cation inversion (Fe²⁺ ↔ Fe³⁺) and oxygen vacancy formation. Transmission electron microscopy showed nearly spherical particles (21–45 nm), consistent with XRD results. Magnetic characterization via electron paramagnetic resonance and vibrating sample magnetometry revealed fuel-dependent g-value shifts and superexchange interactions (Fe³⁺–O–Fe³⁺ and Fe²⁺–O–Fe³⁺). All samples exhibited superparamagnetic behavior with low coercivity (Hc), remanence (Mr), and squareness ratio (Mr/Ms < 0.1). Tartaric acid-synthesized ZnFe₂O₄ showed the highest saturation magnetization (12.55 emu/g) and magnetic moment per Fe atom. Field-cooled/zero-field-cooled (FC-ZFC) study also indicated superparamagnetic behavior for all the synthesized samples, with the lowest blocking (66.41 K) and irreversible (115 K) temperature for tartaric acid synthesized ZnFe₂O₄.

以酒石酸、柠檬酸和甘氨酸为螯合剂，采用溶胶-凝胶法制备了纳米铁酸锌（ZnFe2O4）。热重分析证实在~ 400°C形成相。估计了生成焓（ΔH）和每个纳米颗粒的平均盖层分子数(N)。x射线衍射数据的Rietveld细化揭示了晶格参数的变化，酒石酸衍生的样品显示出最高的值（a = 8.441 Å），平均晶粒尺寸为~ 22 nm。拉曼光谱证实了相纯度，而x射线光电子能谱显示了燃料依赖的阳离子倒置（Fe2+↔Fe3+）和氧空位的形成。透射电镜观察到颗粒呈近球形（21 ~ 45 nm），与XRD结果一致。通过电子顺磁共振和振动样品磁强计进行的磁性表征揭示了燃料依赖的g值偏移和超交换相互作用（Fe3+ -O-Fe3 +和Fe2+ -O-Fe3 +）。所有样品均表现出低矫顽力（Hc）、低剩余物（Mr）和低方形比（Mr/Ms < 0.1）的超顺磁性行为。酒石酸法合成的ZnFe2O4具有最高的饱和磁化强度（12.55 emu/g）和每个Fe原子的磁矩。场冷/零场冷（FC-ZFC）研究表明，所有合成样品均具有超顺磁性，酒石酸合成的ZnFe2O4具有最低的阻滞温度（66.41 K）和不可逆温度（115 K）。

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引用次数: 0

Enhancing electrical and optical performance in PbO-doped TiO2–Al2O3–CaO–Na2O–SiO2 glasses: Structure–property relationship pbo掺杂TiO2-Al2O3-CaO-Na2O-SiO2玻璃的电学和光学性能：结构-性能关系

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2025-12-29 DOI: 10.1016/j.ceramint.2025.12.442

Sadiye Cetinkaya Colak

Sodium-titanium-silicate glasses with the nominal composition of 1TiO₂ - 1Al₂O₃ - 3CaO - 25Na₂O - (70−x)SiO₂: xPbO (x = 0, 5, 10, 15 wt%) were synthesized via the conventional melt-quenching method to investigate the impact of PbO incorporation on their electrical and optical properties. The study comprehensively evaluted density, molar volume, DC conductivity over a wide temperature range, and UV–Vis absorption behavior. The addition of PbO led to a measurable increase in both density and molar volume, which was attributed to the high atomic mass and structural influence of Pb²⁺ ions within the glass matrix. All compositions exhibited insulating behavior at room temperature, while low-temperature conductivity was governed by a small polaron hopping mechanism. Optical measurements revealed that moderate PbO content (5 wt%) enhanced transparency, whereas higher levels introduced localized defects that reduced overall transmittance. Furthermore, the estimated optical band gap (E_opt), Urbach energy (E_U), and defect energy (E_d) values indicated a gradual reduction in structural disorder with increasing PbO content. In addition, spectroscopic ellipsometry analysis provided refractive index (n) and extinction coefficient (k) spectra in the near-infrared range, confirming that PbO incorporation results in a slight but consistent increase in optical density. This behavior is attributed to the combined effects of Pb²⁺ polarizability, increased material density, and the formation of non-bridging oxygen sites. These results hifhlight that PbO can be effectively utilized to tune the structural and functional properties of silicate-based glasses, suggesting their potential applicability in optical and insulating devices.

采用传统的熔融猝灭法合成了标称成分为1TiO2 - 1Al2O3 - 3CaO - 25Na2O -(70−x)SiO2: xPbO （x = 0,5,10,15 wt%）的硅酸钠玻璃，研究了PbO掺入对其电学和光学性能的影响。该研究综合评估了密度、摩尔体积、宽温度范围内的直流电导率和UV-Vis吸收行为。PbO的加入导致了密度和摩尔体积的显著增加，这是由于玻璃基体中Pb2+离子的高原子质量和结构影响。所有成分在室温下都表现出绝缘行为，而低温电导率则由一个小的极化子跳变机制控制。光学测量显示，适度的PbO含量（5wt %）增强了透明度，而较高的PbO含量会引入局部缺陷，降低了整体透过率。此外，光学带隙（Eopt）、乌尔巴赫能（EU）和缺陷能（Ed）的估计值表明，随着PbO含量的增加，结构无序性逐渐降低。此外，光谱椭偏分析提供了近红外范围内的折射率(n)和消光系数(k)光谱，证实了PbO的加入导致光密度轻微但一致的增加。这种行为归因于Pb2+极化率、材料密度增加和非桥氧位形成的综合作用。这些结果表明PbO可以有效地用于调整硅酸盐基玻璃的结构和功能特性，表明它们在光学和绝缘器件中的潜在适用性。

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引用次数: 0

Carbonisation behaviour of steelmaking slag-modified aluminate cement paste under high-temperature, high-pressure, and supercritical CO2 炼钢渣改性铝酸盐水泥浆在高温、高压和超临界CO2下的碳化行为

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-03 DOI: 10.1016/j.ceramint.2025.12.516

Kaiqiang Liu , Zexiang Gong , Haigui Li , Minghui Hu , Xingguo Zhang

In this study, a slag-modified aluminate cement (SAC) paste was developed to cement CO₂ geological storage wells. The carbonisation behaviour and mechanisms of this paste under high-temperature and high-pressure (HTHP) and supercritical CO₂ (scCO₂) were investigated using scanning electron microscopy, X-ray diffraction, thermogravimetry, and N₂ adsorption methods. The results revealed that the primary hydration products in the SAC paste were stratlingite and katoite, and no conversion process or strength retrogression was observed. The compressive strength of the paste cured for 28 days at 90 and 120 °C was 208.12 % and 175.36 % higher than that of unmodified aluminate cement, respectively. Under HTHP-scCO₂ conditions, the carbonisation depth of the SAC paste increased with rising temperature; notably, the carbonisation process did not compromise the compressive strength of the paste. Under these carbonisation conditions, stratlingite and katoite were converted to laminated aragonite and Al(OH)₃. The aggregated Al(OH)₃ covered aragonite, effectively reducing the latter's leaching. Furthermore, the carbonisation products altered the pore structure, leading to narrow slit-like pores that contributed to pore refinement and densification in the SAC paste. Consequently, the microstructure of the paste became denser, resulting in enhanced compressive strength. When the SAC paste was carbonised for 28 days at 90 °C under 20 MPa scCO₂, its compressive strength reached 23.23 MPa, 15.45 % higher than the uncarbonised paste's compressive strength. These findings provide new insights into the suitability of the SAC system for HTHP-scCO₂ conditions.

研究了一种矿渣改性铝酸盐水泥（SAC）膏体，用于固井。采用扫描电镜、x射线衍射、热重法和N2吸附法研究了该浆料在高温高压（HTHP）和超临界CO2 （scCO2）条件下的碳化行为和机理。结果表明：SAC膏体的主要水化产物为平层石和katoite，未发生转化过程和强度倒退；经90℃和120℃处理28 d后，膏体抗压强度分别比未改性铝酸盐水泥高208.12%和175.36%。在高温高压scco2条件下，SAC膏体的碳化深度随着温度的升高而增加；值得注意的是，碳化过程没有损害膏体的抗压强度。在这些碳化条件下，平层石和katoite转化为层状文石和Al(OH)3。聚集的Al(OH)3覆盖文石，有效地减少了文石的浸出。此外，炭化产物改变了SAC膏体的孔隙结构，形成狭窄的裂隙状孔隙，有助于孔隙的细化和致密化。因此，膏体的微观结构变得更加致密，从而提高了抗压强度。在20 MPa scCO2条件下，90℃下碳化28 d， SAC膏体抗压强度达到23.23 MPa，比未碳化膏体抗压强度提高15.45%。这些发现为SAC系统在高温高压scco2条件下的适用性提供了新的见解。

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