Ceramics International最新文献_第4页

Inspection of structural and high temperature dielectric characteristics of CAO-Zn ceramic material for high frequency applications 高频用CAO-Zn陶瓷材料结构及高温介电特性检测

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

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2025-12-30 DOI: 10.1016/j.ceramint.2025.12.496

Mamta , Neha Singh , Anita , Shalini Verma , S. Ravi , P.A. Alvi , Aakansha

This work is dedicated to the exclusive exploration of structural and dielectric properties of Zn substituted Cobalt aluminate (Co_1-xZn_xAl₂O₄ (CAO-Zn) for x = 0, 0.25, 0.5, 0.75 and 1.00 mol %) synthesized via sol-gel chemical method. The material is prepared purely in single phase with no impurity imprints, deduced through the X-ray diffraction pattern. Rietveld refinement was carried out using Fullprof software and structural parameter are retrieved. With Zn²⁺ substitution lattice constant reduced slightly at x = 0.25 and beyond that it increased. Microstructure analysis shows the compact grains along with grain boundaries and with Zn²⁺ substitution particle size increases from 18 μm for x = 0.0–38 μm for x = 0.5 and then reduced to 27 μm for x = 1.00. Additionally, Tauc plot analysis derived the direct band gap varying from 2.34 eV for x = 0–4.17 eV for x = 1.00. Further, dielectric analysis is executed at high temperature (50 °C–400 °C). The frequency variation of impedance in the synthesized material is explained based on Maxwell-Wagner polarization. Reduction in impedance value with rise in temperature directs towards negative temperature coefficient of resistance indicates the semiconducting behavior of the synthesized material at higher temperatures. Moreover, the overall value of dielectric constant enhances (13 for x = 0 to 30 for x = 0.5 at f = 1 MHz and T = 50 °C) and the dissipation factor has reduced <1 with increase in conductivity with Zn substitution up to x = 0.5. The ac conductivity demonstrated through Jonscher power Law which shows the lifts up in conduction energy from 0.14 eV to 0.28 eV. These improved structural and dielectric properties making Zn substituted Cobalt aluminate a promising material for high frequency dielectric applications. The simulation is also carried out, and resonance frequency for host CAO and Zn substituted CAO lies in the K band (18 GHz–27 GHz) which directs applicability of synthesized aluminates towards high frequency applications.

本文专门研究了用溶胶-凝胶化学方法合成的锌取代铝酸钴（Co1-xZnxAl2O4 (CAO-Zn), x = 0、0.25、0.5、0.75和1.00 mol %）的结构和介电性能。该材料是纯单相制备的，没有杂质印记，通过x射线衍射图推断。利用Fullprof软件进行Rietveld细化，检索结构参数。随着Zn2+取代晶格常数在x = 0.25时略有下降，在此之后晶格常数增加。显微组织分析表明，随着Zn2+取代，晶粒沿晶界致密化，晶粒尺寸从x = 0.0时的18 μm增大到x = 0.5时的38 μm，然后减小到x = 1.00时的27 μm。此外，Tauc图分析得出，x = 1.00时，直接带隙从2.34 eV变化为4.17 eV。此外，在高温（50°C - 400°C）下进行介电分析。利用麦克斯韦-瓦格纳极化理论解释了合成材料中阻抗的频率变化。阻抗值随温度升高而减小，导致电阻温度系数为负，表明合成材料在较高温度下具有半导体性能。此外，在f = 1 MHz和T = 50℃时，介电常数的总体值增加（当x = 0时为13，当x = 0.5时为30），并且随着电导率的增加，损耗因子降低了<；1， Zn取代达到x = 0.5。通过Jonscher幂定律证明了交流电导率，表明传导能从0.14 eV上升到0.28 eV。这些改进的结构和介电性能使锌取代铝酸钴成为高频介电应用的有前途的材料。模拟结果表明，主氧化钙和锌取代氧化钙的共振频率在K波段（18 GHz - 27 GHz），这表明合成的铝酸盐适用于高频应用。

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引用次数: 0

Interlayer-thickness effects of energy storage in NaNbO3-modulated BiFeO3-BaTiO3 multilayer ceramic capacitor nanbo3调制BiFeO3-BaTiO3多层陶瓷电容器的层间-厚度储能效应

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.2026.01.013

Rhea Fe G. Sinajon , R.R. Chien , Rhys Montecillo , Cheng-Sao Chen , J. Anthoniappen , Kuei-Chih Feng , Chi-Shun Tu

Sustainable dielectric ceramic capacitors featuring high energy-storage capability, temperature stability, and fatigue resistance have become crucial for advancing energy storage technologies. This study explores the ceramic-interlayer thickness effects of energy storage capability in antiferroelectric NaNbO₃ modified 0.7BiFeO₃–0.3BaTiO₃ multilayer ceramic capacitors (MLCC). The breakdown electric strength (E_b) was remarkably increased from 350 kV/cm to 600 kV/cm as ceramic-interlayer thickness was reduced from 57 μm to 18 μm. Hence, recoverable energy density (W_rec) was enhanced from 3.0 J/cm³ to 7.0 J/cm³ with efficiencies >70 %. The energy storage performance in MLCCs with thinner ceramic interlayers was significantly enhanced due to the synergistic effect of multiple phases, nanostructures, and interfacial electric fields at grain boundaries. In addition, MLCCs with thicker ceramic interlayers exhibited enhanced charge-discharge fatigue resistance, maintaining a variation of less than 8 % after 1 × 10⁴ cycles at a charging electric field of 200 kV/cm. This study demonstrates the potential of NaNbO₃ modulated BiFeO₃-BaTiO₃ multilayer ceramics for advanced capacitive energy storage applications.

具有高储能能力、温度稳定性和抗疲劳性能的可持续介质陶瓷电容器已成为推进储能技术的关键。本研究探讨了反铁电NaNbO3修饰的0.7BiFeO3-0.3BaTiO3多层陶瓷电容器（MLCC）的陶瓷层间厚度对储能能力的影响。当陶瓷层厚度从57 μm减小到18 μm时，击穿电强度（Eb）从350 kV/cm显著增加到600 kV/cm。因此，可回收能量密度（Wrec）从3.0 J/cm3提高到7.0 J/cm3，效率为70%。由于多相、纳米结构和晶界处界面电场的协同作用，薄陶瓷夹层的储能性能得到了显著提高。此外，具有较厚陶瓷夹层的mlcc具有增强的充放电疲劳抗力，在200 kV/cm的充电电场下，在1 × 104次循环后保持小于8%的变化。该研究证明了NaNbO3调制BiFeO3-BaTiO3多层陶瓷在先进电容储能应用中的潜力。

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引用次数: 0

Unraveling metal-dependent ultrafast dynamics and nonlinear optical behavior in curcumin-based Co (II) and Pd (II) complexes 揭示基于姜黄素的Co （II）和Pd （II）配合物中金属依赖的超快动力学和非线性光学行为

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

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-07 DOI: 10.1016/j.ceramint.2026.01.005

S. Supriya , K.B. Manjunatha , Vikas Jha , E. Siva Subramaniam Iyer , Jong-Ryul Jeong , Dileep Ramakrishna , Srivathsava Surabhi

This study investigates the ultrafast nonlinear optical properties and excited-state dynamics of two curcumin-based metal complexes, namely, Cobalt (II)-Triphenylphosphine-Curcumin (CoTppCur) and Palladium (II)-Triphenylphosphine-Curcumin (PdTppCur), where TppCur denotes a triphenylphosphine-capped curcumin framework. Using femtosecond transient absorption spectroscopy (TAS), Z-scan, and optical Kerr gate (OKG) techniques, we reveal how the central metal ion influences third-order susceptibility (χ³), relaxation kinetics, and absorption phenomena. UV–Vis spectra confirm complexation through LMCT and d–d transitions, with CoTppCur showing red-shifted peaks due to stronger orbital overlap. TAS identifies two main decay pathways: fast ligand-to-metal charge transfer (LMCT) and slower S_n → S₁ relaxation. CoTppCur exhibits faster dynamics, linked to its smaller ionic radius and higher electron affinity, enabling efficient internal conversion and intersystem crossing. Z-scan measurements show strong saturable absorption in both complexes, with CoTppCur displaying a larger nonlinear absorption coefficient (β = −23 cm/GW) compared to PdTppCur (β = −18 cm/GW). OKG analysis supports these findings, revealing instantaneous birefringence with biexponential decay. Density Functional Theory (DFT) calculations complement experiments: PdTppCur is more stable (ΔE = 3.34 eV) but less optically active, while CoTppCur, with a smaller gap (ΔE = 2.43 eV), is softer and more polarizable. Frontier orbital mapping shows charge localization along the metal–ligand axis, consistent with LMCT behavior. Finite-Difference Time-Domain (FDTD) simulations further confirm higher local field enhancement and faster refractive index modulation in CoTppCur thin films under femtosecond excitation. Overall, the combined experimental–theoretical approach highlights the role of metal centers in tuning ultrafast relaxation and nonlinear responses. These results suggest that curcumin-based transition metal complexes, particularly CoTppCur, hold strong potential for ultrafast photonic device applications.

本研究研究了两种基于姜黄素的金属配合物，即钴(II)-三苯基膦-姜黄素（CoTppCur）和钯(II)-三苯基膦-姜黄素（PdTppCur）的超快非线性光学性质和激发态动力学，其中TppCur表示三苯基膦-姜黄素框架。利用飞秒瞬态吸收光谱（TAS）、z扫描和光学克尔门（OKG）技术，我们揭示了中心金属离子如何影响三阶磁化率（χ3）、弛豫动力学和吸收现象。紫外可见光谱通过LMCT和d-d跃迁证实了络合作用，由于轨道重叠较强，CoTppCur出现了红移峰。TAS确定了两种主要的衰变途径：快速配体到金属电荷转移（LMCT）和较慢的Sn→S1弛豫。CoTppCur表现出更快的动力学，这与它更小的离子半径和更高的电子亲和力有关，从而实现有效的内部转换和系统间交叉。z扫描结果表明，两种配合物均具有较强的饱和吸收，其中CoTppCur的非线性吸收系数（β = - 23 cm/GW）高于PdTppCur （β = - 18 cm/GW）。OKG分析支持这些发现，揭示了双指数衰减的瞬时双折射。密度泛函理论（DFT）的计算补充了实验结果：PdTppCur更稳定（ΔE = 3.34 eV），但光活性更低，而CoTppCur的间隙更小（ΔE = 2.43 eV），更柔软，更极化。前沿轨道映射显示沿金属配体轴的电荷局域化，与LMCT行为一致。时域有限差分（FDTD）仿真进一步证实了在飞秒激励下，CoTppCur薄膜具有更高的局域场增强和更快的折射率调制。总的来说，实验-理论结合的方法强调了金属中心在调谐超快弛豫和非线性响应中的作用。这些结果表明，基于姜黄素的过渡金属配合物，特别是CoTppCur，在超快光子器件应用中具有很强的潜力。

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引用次数: 0

Superhydrophobicity and in situ barrier: A dual-functional coating for hydration-resistant MgO-CaO refractories 超疏水性和原位屏障：抗水化氧化镁-氧化钙耐火材料的双功能涂层

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.2026.01.006

Jingxuan Luo , Rong Li , Wenhao Li , Shuhui Zhou , Zhiyuan Xu , Bangbang Liu , Chen Chen , Naijing Bu , Xiaodong Mao , Shaowei Zhang , Qiang Zhen

Hydration resistance is a critical performance indicator for MgO-CaO refractories in industrial applications. In this study, a novel anti-hydration strategy was developed through the construction of a composite organic–inorganic coating on MgO-CaO aggregates using a facile impregnation approach. The coating comprises a ZrCl₄-derived sol, docosanoic acid (DCA, C₂₂H₄₄O₂), and nano-ZrO₂ particles. The modified aggregates exhibited super-hydrophobicity properties, with a water contact angle of 150.47°, which effectively inhibited moisture penetration. Upon heat treatment, the ZrCl₄-derived sol decomposed and further reacted with CaO to form a dense CaZrO₃ layer, providing long-term hydration resistance. Hydration tests demonstrated exceptional stability, with a weight gain of only 0.025 % after 10 days of exposure to humid environments (at 25 °C and 85 % relative humidity). This work offers a scalable approach to enhance the durability of MgO-CaO refractories by integrating short-term hydrophobicity and long-term ceramic passivation.

在工业应用中，抗水化性能是氧化镁-氧化钙耐火材料的重要性能指标。在这项研究中，通过使用易浸渍方法在MgO-CaO聚集体上构建有机-无机复合涂层，开发了一种新的抗水化策略。该涂层包括zrcl4衍生的溶胶、二十二酸（DCA, C22H44O2）和纳米zro2颗粒。改性聚集体具有超疏水性，水接触角为150.47°，有效抑制了水分的渗透。热处理后，zrcl4衍生的溶胶分解并与CaO进一步反应形成致密的CaZrO3层，具有长期的抗水化能力。水化试验显示出优异的稳定性，暴露在潮湿环境（25°C和85%相对湿度）10天后，体重仅增加0.025%。这项工作提供了一种可扩展的方法，通过整合短期疏水性和长期陶瓷钝化来提高MgO-CaO耐火材料的耐久性。

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引用次数: 0

Low-temperature fabrication mechanisms and optical properties of ZrO2-La2O3 co-doped Er2O3 transparent ceramics ZrO2-La2O3共掺Er2O3透明陶瓷的低温制备机理及光学性能

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.2026.01.008

Hong-Lan Liu, Lin-Lin Zhu, Si-Yuan Tong, Wei-Ming Guo, Hua-Tay Lin

The highly transparent Er₂O₃ ceramics were prepared with ZrO₂ and La₂O₃ sintering aids in vacuum. The experimental results demonstrate that the presence of ZrO₂ consistently suppresses grain boundary migration, while La₂O₃ promotes it. And the ability of ZrO₂ to reduce grain boundary migration rate surpasses the effect of La₂O₃ in promoting grain boundary migration. At 1600 °C, the Er₂O₃ transparent ceramics doped with 10 at.% La₂O₃ and 1 at.% ZrO₂ achieved optimal transparency with in-line transmittance of 76.7 % at 1100 nm. The Er₂O₃ sample doped with 10 at.% La₂O₃ and 3 at.% ZrO₂, sintered at 1800 °C, exhibited the highest transmittance, reaching 80.3 % at 1100 nm, corresponding to 99.1 % of the theoretical in-line transmittance of Er₂O₃ single crystal. Up/down-conversion emissions in Er₂O₃ ceramic doped with 10 at.% La₂O₃ and 3 at.% ZrO₂ were observed across the visible, near-infrared, and mid-infrared regions, exhibiting promising potential for applications as fluorescent displays, up-conversion luminescent materials, and infrared lasers.

采用ZrO2和La2O3助烧剂在真空中制备了高透明Er2O3陶瓷。实验结果表明，ZrO2的存在持续抑制晶界迁移，而La2O3的存在促进晶界迁移。ZrO2降低晶界迁移速率的能力超过了La2O3促进晶界迁移的作用。在1600℃时，Er2O3透明陶瓷掺杂10at。% La2O3和1 at。ZrO2在1100nm处的在线透过率为76.7%，达到了最佳的透明度。掺10at的Er2O3样品。% La2O3和3at。在1800℃下烧结的ZrO2在1100nm处透光率最高，达到80.3%，相当于Er2O3单晶理论在线透光率的99.1%。掺10at的Er2O3陶瓷的上/下转换发射。% La2O3和3at。% ZrO2在可见光、近红外和中红外区域都被观察到，显示出在荧光显示器、上转换发光材料和红外激光器方面有很大的应用潜力。

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引用次数: 0

Controllable synthesis of Bi3.2Mo0.8O7.5 nanoparticles and Bi2MoO6 nanoplates in a hydrothermal process with dielectric and ferroelectric explorations after sintering at 600 °C 600℃烧结后水热法制备Bi3.2Mo0.8O7.5纳米粒子和Bi2MoO6纳米板，并进行介电和铁电探索

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.2025.12.436

Kang Yong , Zheng Chen , Zhimin Fu , Changyun Li , Lei Xu , Hanzhuo Zhang

The increasing demand for microelectronic and multi-functional devices has triggered extensive studies on low-temperature sintered bismuth-molybdenum oxides. In this study, nanostructured Bi₂MoO₆ and Bi_3.2Mo_0.8O_7.5 were synthesized in a facile hydrothermal process by varying pH values in aqueous solutions. Materials characterization confirmed that Aurivillius type of Bi₂MoO₆ nanoparticles came from the acid conditions, while fluorite type of Bi_3.2Mo_0.8O_7.5 nanoflakes were obtained from alkaline treatment. Thermal analysis revealed phase transition of Bi₂MoO₆ around 713 °C and decomposition of Bi_3.2Mo_0.8O_7.5 at 662 °C respectively. Dielectric and ferroelectric properties were examined after both bismuth molybdates were sintered at 600 °C for 4 h into dense ceramics. Both dielectric constant and loss were decreased as the frequency increased from 10² Hz to 10⁶ Hz, while Bi_3.2Mo_0.8O_7.5 exhibited ultra-low dielectric loss around 0.07 at 10⁶ Hz in temperature range of 25–250 °C. Linear dielectric and ferroelectric features of both bismuth molybdates were confirmed, where Bi₂MoO₆ exhibited the maximum polarization intensity of 2.4 μC/cm².

随着微电子和多功能器件需求的不断增长，低温烧结铋钼氧化物得到了广泛的研究。在本研究中，通过改变水溶液pH值，在简易水热法中合成了纳米结构Bi2MoO6和Bi3.2Mo0.8O7.5。材料表征证实了Aurivillius型Bi2MoO6纳米片来源于酸性条件，而萤石型Bi3.2Mo0.8O7.5纳米片来源于碱性条件。热分析表明，Bi2MoO6在713℃左右相变，Bi3.2Mo0.8O7.5在662℃分解。将两种钼酸铋在600℃下烧结4 h制成致密陶瓷，考察其介电性能和铁电性能。当频率从102 Hz增加到106 Hz时，介电常数和介电损耗均降低，而在25 ~ 250℃温度范围内，Bi3.2Mo0.8O7.5在106 Hz时的介电损耗为0.07左右。证实了两种钼酸铋的线性介电和铁电特性，其中Bi2MoO6的最大极化强度为2.4 μC/cm2。

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引用次数: 0

Resistive switching properties of sol-gel derived Sm2Zr2(1-x)Mg2xO7 (x = 0–0.09) thin films 溶胶-凝胶衍生Sm2Zr2(1-x)Mg2xO7 （x = 0-0.09）薄膜的电阻开关特性

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

Ceramics International

Pub Date : 2026-03-01 Epub Date: 2026-01-01 DOI: 10.1016/j.ceramint.2025.12.434

Hsin-Ching Tai, Cheng-Liang Huang

Sm₂Zr_2(1-x)Mg_2XO₇ (SZMO) thin films, employed as the switching layer in RRAM devices, were synthesized via the sol–gel process. The effects of Mg⁺² doping concentration, annealing temperature, and the formation of an interfacial AlO_x layer (induced by post-metallization annealing, PMA) on the resistive switching performance were systematically investigated. The Mg⁺²-doped sample exhibits a reduced variability in both the LRS and HRS, a lower operating voltage and enhanced RS uniformity. Thermal treatments contribute to increase the memory window and improve the stability of the resistive states of the devices. The AlO_x layer acts as an oxygen reservoir, further enhancing the generation of oxygen vacancies within the SZMO film. Additionally, the diffusion of aluminum and indium ions into the film during PMA contributes to improved filament stability, resulting in more reliable and robust switching behavior. Among all devices, the Al/SZMO (x = 0.05_PMA, 300 °C)/ITO device exhibited the most favorable performance, featuring the lowest operating voltages (−1.25 V/0.25 V), the highest endurance cycles (2333), and a clean and well-confined resistance window (10³). The results offer new insights into tuning the RS behavior and enhancing the performance of SZMO-based RRAM devices through doping and thermal treatments.

采用溶胶-凝胶法制备了Sm2Zr2(1-x)Mg2XO7 （SZMO）薄膜，作为RRAM器件的开关层。系统地研究了Mg+2掺杂浓度、退火温度和界面AlOx层的形成（由金属化后退火（PMA）诱导）对电阻开关性能的影响。Mg+2掺杂样品显示LRS和HRS的变异性降低，工作电压降低，RS均匀性增强。热处理有助于增加记忆窗口和提高器件电阻状态的稳定性。AlOx层作为氧气库，进一步促进了SZMO膜内氧空位的生成。此外，在PMA过程中，铝和铟离子在薄膜中的扩散有助于提高灯丝的稳定性，从而产生更可靠和稳健的开关行为。在所有器件中，Al/SZMO (x = 0.05_PMA, 300°C)/ITO器件表现出最有利的性能，具有最低的工作电压（- 1.25 V/0.25 V），最高的续航周期（2333）和干净且良好的电阻窗口（103）。研究结果为通过掺杂和热处理来调整基于szmo的RRAM器件的RS行为和提高其性能提供了新的见解。

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引用次数: 0

Biocompatibility screening of additively manufactured Ti alloys with electrophoretic deposition of nano-hydroxyapatite composite layers 纳米羟基磷灰石复合层电泳制备钛合金的生物相容性筛选

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.2025.12.461

S. Gunasekaran , D. Manjubashini , K. Gobi Saravanan , Dmitry V. Shtansky , B. Subramanian

Due to its unique benefits, additive manufacturing (AM) is increasingly being studied for producing biomedical implants. However, additively manufactured components often have a distinct microstructure and surface finish compared to traditional methods, and they generally show limited bioactivity. This study aimed to improve the bioactivity of AM fabricated Ti-6Al-4V alloy by applying nano-hydroxyapatite (n-HAp) and Hydroxyapatite/Titanium dioxide nanocomposite (nc-HAp/TiO₂) coatings using electrophoretic deposition. Systematically, the deposition parameters were varied with different voltages ranging from 5, 10, 15, and 20 V, with an optimized deposition duration of 300 s. Laser Raman analysis and FT-IR spectroscopy techniques were used to identify the formation of the n-HAp and nc-HAp/TiO₂ coatings. XRD analysis indicated that these coatings exhibited a polycrystalline structure, with the (121) plane demonstrating the highest intensity among the observed planes. Field emission scanning electron microscopy (FESEM) confirmed the microstructure and surface finish, while the elemental composition of the coatings was confirmed by EDAX and XPS techniques. Contact angle measurements showed that both coatings are hydrophilic in nature. The incorporation of TiO₂ with n-HAp showed better mechanical properties than pristine n-HAp coatings. In vitro studies showed that nc-HAp/TiO₂ coating had better antibacterial activity, lower hemolytic ratio, and improved hemostasis performance. The electrochemical corrosion studies using Simulated Body Fluid (SBF) as an electrolyte showed that the coatings have higher corrosion resistance performance than the bare Ti alloy substrate.

由于其独特的优势，增材制造（AM）越来越多地被研究用于生产生物医学植入物。然而，与传统方法相比，增材制造的组件通常具有独特的微观结构和表面光洁度，并且它们通常显示有限的生物活性。本研究旨在通过电泳沉积纳米羟基磷灰石（n-HAp）和羟基磷灰石/二氧化钛纳米复合材料（nm - hap /TiO2）涂层来提高AM制备的Ti-6Al-4V合金的生物活性。系统地改变了5、10、15和20 V不同电压下的沉积参数，并优化了沉积时间为300 s。采用激光拉曼分析和傅里叶红外光谱技术鉴定了n-HAp和nc-HAp/TiO2涂层的形成过程。XRD分析表明，涂层呈多晶结构，其中（121）面强度最高。场发射扫描电子显微镜（FESEM）证实了涂层的微观结构和表面光洁度，并用EDAX和XPS技术证实了涂层的元素组成。接触角测量表明，这两种涂层本质上都是亲水的。TiO2与n-HAp的掺入比原始n-HAp涂层具有更好的力学性能。体外研究表明，nc-HAp/TiO2涂层具有较好的抗菌活性，较低的溶血率，改善了止血性能。以模拟体液（SBF）为电解液的电化学腐蚀研究表明，涂层的耐腐蚀性能优于裸钛合金基体。

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引用次数: 0

Regulate strength, ductility and thermodynamic properties of W2AlC MAX ceramics for ultrahigh temperature applications 调节超高温应用中W2AlC MAX陶瓷的强度、延展性和热力学性能

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.2025.12.457

Lirong Xu, Yong Pan

W₂AlC MAX phase is regarded as a promising ultrahigh-temperature ceramic due to the mixed high melting point, high temperature strength and excellent oxidation resistance. However, further enhancing its overall properties and promoting its potential application in future ultrahigh-temperature environments has significant engineering importance. To solve these problems, the influence of refractory metals (TM) on the structural stability, mechanical, and thermodynamic properties of W₂AlC is studied using first-principles methods. Two doped sites: W-site and Al-site are considered. The result shows that TM-doping at the W-site exhibits good structural stability in comparison to the Al-site. Importantly, these refractory metals can enhance the shear deformation resistance and elastic stiffness of W₂AlC, with Mo-doping increasing Vickers hardness by 45.1 %. In addition, W₂AlC also exhibits good ductility even with enhanced mechanical strength. Moreover, Mo-doping and Cr-doping increase the Debye temperature and melting point of W₂AlC. Essentially, these improvements are that TM-doping enhances the localized hybridization between W and C atoms in shear direction, which is confirmed by the change of W-C bond. Therefore, Mo as an effective doping that significantly enhances the mechanical and thermodynamic properties of W₂AlC while maintaining its ductility, which improving its structural reliability under high-temperature and extreme conditions.

W2AlC MAX相具有高熔点、高温强度和优异的抗氧化性能，被认为是一种很有前途的超高温陶瓷。然而，进一步提高其整体性能并促进其在未来超高温环境中的潜在应用具有重要的工程意义。为了解决这些问题，采用第一性原理方法研究了难熔金属（TM）对W2AlC结构稳定性、力学性能和热力学性能的影响。考虑了两个掺杂位点：w位点和al位点。结果表明，与al位点相比，tm在w位点的掺杂表现出良好的结构稳定性。重要的是，这些难熔金属可以提高W2AlC的抗剪切变形能力和弹性刚度，mo的掺杂使W2AlC的维氏硬度提高45.1%。此外，在机械强度提高的情况下，W2AlC也表现出良好的延展性。mo和cr的掺杂提高了W2AlC的Debye温度和熔点。本质上，这些改进是tm掺杂增强了W和C原子在剪切方向上的局部杂化，这一点通过W-C键的变化得到了证实。因此，Mo作为一种有效的掺杂，在保持W2AlC延展性的同时，显著提高了W2AlC的力学和热力学性能，提高了W2AlC在高温和极端条件下的结构可靠性。

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引用次数: 0

Yttrium-induced modification of structural, magnetic, optical, and photocatalytic characteristics in Ni-Zn–Mn nanoferrites for versatile applications 钇诱导的镍锌锰纳米铁氧体结构、磁性、光学和光催化特性的改性，用于多种应用

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.2025.12.484

N.S. Al-Bassami , S.F. Mansour , Mahaboob Beevi Mohamed Yusuf , N. Usha , Nada H. Alsmail , M.A. Abdo

Rare earth elements are crucial for advanced technologies, industrial production, and defense systems, but their global supply remains a significant concern. This study examines yttrium as an alternative rare-earth dopant to improve the functional performance of nickel-zinc–manganese nanoferrites for various industrial uses. A series of Y-doped Ni-Zn–Mn ferrites, with the general formula Ni_0.5Zn_0.3Mn_0.2Y_xFe_2-xO₄ (x = 0.00–0.80), were produced using the citrate combustion method. Structural and morphological analyses using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning transmission electron microscopy (STEM), and energy-dispersive X-ray spectroscopy (EDX) confirmed the formation of nano-spinel ferrites with crystallite sizes ranging from 7.93 to 3.62 nm. The saturation magnetisation (M_s) steadily decreased from 61.25 emu/g (x = 0.00) to 44.64 emu/g (x = 0.08), showing that Y³⁺ substitution weakens the overall magnetic order in the spinel structure by disrupting exchange interactions between magnetic ions. The composition Ni0.5Zn0.3Mn0.2Y₀.₆Fe₁.₉₄O₄ exhibited low coercivity (94.78 Oe) and moderate magnetisation (42.83 emu/g), making it suitable for soft magnetic applications, while Ni_0.5Zn_0.3Mn_0.2Y_0.08Fe_1.92O₄ had the lowest squareness ratio (0.168), ideal for transformer cores. Optical analysis using the Kubelka–Munk model showed a tunable band gap from 1.78 to 1.62 eV. The Ni_0.5Zn_0.3Mn_0.2Y_0.08Fe_1.92O₄ sample achieved 97.84 % efficiency in degrading methylene blue and maintained excellent stability over five cycles. These results demonstrate that Y³⁺ addition effectively adjusts the magnetic, optical, and photocatalytic properties of Ni-Zn–Mn ferrites, supporting their use in energy-efficient electronics and wastewater treatment technologies.

稀土元素对先进技术、工业生产和国防系统至关重要，但其全球供应仍然是一个重大问题。本研究探讨了钇作为一种替代稀土掺杂剂，以改善各种工业用途的镍锌锰纳米铁氧体的功能性能。采用柠檬酸盐燃烧法制备了一系列y掺杂的Ni-Zn-Mn铁氧体，其通式为Ni0.5Zn0.3Mn0.2YxFe2-xO4 （x = 0.00-0.80）。利用x射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、扫描透射电子显微镜（STEM）和能量色散x射线能谱（EDX）进行结构和形态分析，证实形成了晶粒尺寸为7.93 ~ 3.62 nm的纳米尖晶石铁氧体。饱和磁化强度（Ms）从61.25 emu/g （x = 0.00）稳定下降到44.64 emu/g (x = 0.08)，表明Y3+取代通过破坏磁性离子之间的交换作用削弱了尖晶石结构中的整体磁性秩序。Ni0.5Zn0.3Mn0.2Y0.6Fe1.94O4具有低矫顽力（94.78 Oe）和中等磁化强度（42.83 emu/g），适合软磁应用，而Ni0.5Zn0.3Mn0.2Y0.08Fe1.92O4具有最低的方度比（0.168），是变压器铁心的理想材料。使用Kubelka-Munk模型的光学分析表明，带隙在1.78 ~ 1.62 eV之间可调。ni0.5 zn0.3 mn0.2 y0.08 fe1.92 2o4样品降解亚甲基蓝的效率为97.84%，并在5次循环中保持良好的稳定性。这些结果表明，Y3+的加入有效地调节了Ni-Zn-Mn铁氧体的磁性、光学和光催化性能，支持了它们在节能电子和废水处理技术中的应用。

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