Ceramics International最新文献_第4页

Crystallization behavior, phase separation and fluorescence properties of lunar-soils-based glass-ceramics: Effects of Eu2O3 月壤微晶玻璃的结晶行为、相分离和荧光特性：Eu2O3的影响

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

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.11.057

Wenjie Ge , Haoye Gu , Ye Jin , Haishen Ren , Shaohu Jiang , Zhongyuan Gu , Huixing Lin

In this work, the dual effects of Eu₂O₃ on crystallization behavior, phase separation and fluorescence properties in simulated-lunar-soils-based SiO₂-MgO-CaO-Al₂O₃-K₂O-TiO₂-Na₂O glass-ceramics (SMCA-Eu) were investigated and analyzed. It was demonstrated that as Eu₂O₃ concentration increased, the crystallization activation energy of SMCA-Eu glass declined from 343.42 kJ/mol to 310.01 kJ/mol, subsequently rebounded to 318.43 kJ/mol. The Avrami parameter (n) exhibited distinctive surface crystallization of SMCA-Eu glass-ceramics system with crystalline phases of CaMgSi₂O₆, (Na,Ca)(Al,Si)₄O₈ and Mg₂Al₄Si₅O₁₈. According to SEM and TEM results, the (Na,Ca)(Al,Si)₄O₈ of SMCA-Eu glass-ceramics without Eu₂O₃ transformed into CaAl₂Si₂O₈ and Mg₂Al₄Si₅O₁₈ with increasing of Eu₂O₃ content due to significant phase separation between Ca-rich and Si-rich regions. The optimal incorporation concentration was identified as 1 mol% Eu₂O₃, which yielded a fluorescence lifetime of 1.909 ms. Fluorescence intensity increased by a factor of 2.11 at 613 nm after crystallization, while significant phase separation in high-concentration Eu³⁺ glass-ceramics enhanced fluorescence intensity despite limited crystallization. These findings indicated that SMCA-Eu glass-ceramics exhibit excellent red-blue light emission characteristics, making them promising candidates for plant growth lighting applications in lunar base environments.

本文研究并分析了Eu2O3对模拟月壤型SiO2-MgO-CaO-Al2O3-K2O-TiO2-Na2O微晶玻璃（SMCA-Eu）结晶行为、相分离和荧光性能的双重影响。结果表明，随着Eu2O3浓度的增加，SMCA-Eu玻璃的结晶活化能从343.42 kJ/mol下降到310.01 kJ/mol，随后反弹到318.43 kJ/mol。Avrami参数(n)显示出SMCA-Eu微晶玻璃体系的独特表面结晶，晶相为CaMgSi2O6、（Na,Ca）（Al,Si）4O8和Mg2Al4Si5O18。SEM和TEM结果表明，不含Eu2O3的SMCA-Eu微晶玻璃的（Na,Ca）（Al,Si）4O8随着Eu2O3含量的增加转变为CaAl2Si2O8和Mg2Al4Si5O18，这是由于富Ca区和富Si区之间存在明显的相分离。最佳掺入浓度为1 mol% Eu2O3，荧光寿命为1.909 ms。结晶后613 nm处的荧光强度增加了2.11倍，而高浓度Eu3+微晶玻璃的显著相分离增强了荧光强度，尽管结晶程度有限。这些发现表明，SMCA-Eu微晶玻璃具有优异的红蓝光发射特性，使其成为月球基地环境中植物生长照明的有希望的候选者。

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引用次数: 0

Hydrothermally synthesized snow-flake-like MnCo2O4 supercapacitor material: Structural, electrical and magnetic study 水热合成雪花状MnCo2O4超级电容器材料：结构、电学和磁学研究

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

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.11.119

Priyambada Nayak , Snigdha Sudha Chandana Mohapatra , Balaram Polai , Subrata Karmakar

On considering the advanced electro-ceramic engineering, in this study we focused on snow-flake-like MnCo₂O₄ electrode system for supercapacitor application. Simple hydrothermal approach has been adopted for preparing the sample with “urea” used as a stabilizing agent. The structural characterization and morphological analysis were studied by X-ray diffraction technique (XRD) and Scanning electron microscopy (SEM). The observed XRD data at ambient condition confirmed that the prepared sample was cubic spinel phase, whereas snow-flake-like structure of MnCo₂O₄ was confirmed from the SEM study. We have studied the detailed impedance analysis from 100Hz to 1 MHz frequency with temperature variation from RT (Room temperature) to 150 °C. The AC and DC conductivity results were analyzed in detail and the activation energy (E_a) related to conductivity was calculated. At the same time, electrochemical characterization was performed in order to assess the cyclic-voltammetry (CV) and galvanostatic-charge-discharge (GCD) performance. The prepared MnCo₂O₄ electrode material led to pseudo capacitance behavior with a specific capacitance (C_sp) value 279 Fg⁻¹ at current density 1 Ag⁻¹. The prepared sample also displayed excellent cyclic stability with same retention value of specific capacitance after 5000 cycles. The Magnetic characterization was performed at 120 K. Based on all the above findings, MnCo₂O₄ sample may be suitable candidate for supercapacitor and magnetic acoustic system application.

考虑到先进的电陶瓷工程技术，本研究重点研究了用于超级电容器的雪花状MnCo2O4电极系统。以尿素为稳定剂，采用简单水热法制备样品。采用x射线衍射技术（XRD）和扫描电镜（SEM）对其进行了结构表征和形态分析。室温条件下的XRD观测数据证实制备的样品为立方尖晶石相，而SEM研究证实制备的MnCo2O4为雪花状结构。我们研究了从100Hz到1mhz频率的详细阻抗分析，温度变化从RT（室温）到150°C。详细分析了交流和直流电导率结果，并计算了电导率相关的活化能（Ea）。同时进行了电化学表征，以评价其循环伏安（CV）和恒流充放电（GCD）性能。制备的MnCo2O4电极材料在电流密度为1ag−1时具有伪电容行为，比电容（Csp）值为279 Fg−1。制备的样品在5000次循环后保持相同的比电容值，表现出良好的循环稳定性。在120 K下进行了磁性表征。综上所述，MnCo2O4样品可能是超级电容器和磁声系统应用的合适候选材料。

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引用次数: 0

Preparation of Cr3+/Ni2+ doped calcium phosphate pigments with high near-infrared reflectance 高近红外反射率Cr3+/Ni2+掺杂磷酸钙颜料的制备

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

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.10.389

Zhigang Wen , Shenggao Yang , Lingjie Zeng , Jianxin Xie , Fang Long , Jiyu Zeng

In response to social demands for mitigating the urban heat island effect and conserving energy, pigments have once again emerged as a focal point of research. Metal ion doped calcium phosphate pigments are more environmentally friendly. This study employed sodium dodecylbenzen sulfonate as a regulating reagent to synthesize Ca_3-xCr_x(PO₄)₂ green pigments and Ca_3-yNi_y(PO₄)₂ yellow pigments via a hydrothermal method under low-temperature conditions. The morphologies and crystal phases of the synthesized products were thoroughly characterized using X-ray diffraction and field-emission scanning electron microscopy, and the results revealed that Ca_2.85Cr_0.15(PO₄)₂ and Ca_2.85Ni_0.15(PO₄)₂ pigments formed aggregates with diameters of approximately 1.2 μm and 2 μm, respectively. Portable spectrophotometer analysis confirmed that the concentration of doped ions significantly influenced the color properties of both Ca_3-xCr_x(PO₄)₂ pigments and Ca_3-yNi_y(PO₄)₂ pigments. The ability to prepare different pigments within the same matrix better aligns with engineering requirements. Ultraviolet spectrum analysis yielded band gap values of 4.86 eV and 4.96 eV for Ca_2.85Cr_0.15(PO₄)₂ and Ca_2.85Ni_0.15(PO₄)₂ pigments, respectively. Furthermore, their infrared reflectivities of Ca_2.85Cr_0.15(PO₄)₂ and Ca_2.85Ni_0.15(PO₄)₂ pigments at 2500 nm were measured at 70.95 % and 61.78 %, respectively. When Ca_2.85Ni_0.15(PO₄)₂ was utilized as a colorant and sintered at 850 °C, a ceramic glaze was successfully produced. Experimental results demonstrated the suitability of Ca_3-xCr_x(PO₄)₂ and Ca_3-yNi_y(PO₄)₂ pigments for insulation materials and yellow ceramic glaze.

为了响应社会对缓解城市热岛效应和节约能源的需求，颜料再次成为研究的焦点。金属离子掺杂磷酸钙颜料更环保。本研究以十二烷基苯磺酸钠为调节剂，在低温条件下通过水热法合成Ca3-xCrx(PO4)2绿色颜料和Ca3-yNiy(PO4)2黄色颜料。利用x射线衍射和场发射扫描电镜对合成产物的形貌和晶相进行了全面表征，结果表明，Ca2.85Cr0.15(PO4)2和Ca2.85Ni0.15(PO4)2颜料形成了直径分别约为1.2 μm和2 μm的聚落。便携式分光光度计分析证实，掺杂离子的浓度对Ca3-xCrx(PO4)2颜料和Ca3-yNiy(PO4)2颜料的颜色性能都有显著影响。在同一基质内制备不同颜料的能力更符合工程要求。紫外光谱分析表明，Ca2.85Cr0.15(PO4)2和Ca2.85Ni0.15(PO4)2的带隙值分别为4.86 eV和4.96 eV。在2500 nm处测得Ca2.85Cr0.15(PO4)2和Ca2.85Ni0.15(PO4)2颜料的红外反射率分别为70.95%和61.78%。以Ca2.85Ni0.15(PO4)2为着色剂，850℃烧结制得陶瓷釉料。实验结果表明，Ca3-xCrx(PO4)2和Ca3-yNiy(PO4)2颜料适合作为绝缘材料和黄色陶瓷釉料。

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引用次数: 0

Influence of oxidation time on microstructure and properties of plasma electrolytic oxidation coatings on Hf-Nb-Ta-Zr high-entropy alloy 氧化时间对Hf-Nb-Ta-Zr高熵合金等离子体电解氧化涂层组织和性能的影响

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

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.10.423

Hu Chen , Xin Li , Wanhuan Yang , Lijiao Wang , Luqi Chai , Chi Xu , Jiancheng Du , Xiaoyue Jin , Wenbin Xue

Plasma electrolytic oxidation (PEO) coatings were fabricated on an equimolar Hf-Nb-Ta-Zr refractory high-entropy alloy (RHEA) in a phosphate electrolyte for 20, 40, and 60 min. Coating thickness increased with oxidation time (4–7.5 μm), while average micropore size slightly enlarged (1.49–1.84 μm). The coatings comprised predominantly tetragonal ZrO₂/HfO₂, alongside monoclinic ZrO₂/HfO₂, Nb₂O₅, and Ta₂O₅ phases. Glow discharge optical emission spectrometry (GDOES) revealed elemental enrichment (P, O, H, Na) from the electrolyte at the surface and distinct hydrogen/phosphorus peaks at the coating/substrate interface. Surface properties significantly improved: microhardness rose substantially (up to 635.4 HV), hydrophobicity/oleophobicity increased, surface energy decreased (down to 35.67 mJ/m²), and adhesion strength strengthened (up to 12.85 N). All PEO coatings dramatically enhanced corrosion resistance in 3.5 wt% NaCl solution compared to the bare substrate, evidenced by a two-order-of-magnitude reduction in corrosion current density (lowest i_corr 2.12 × 10⁻⁹ A/cm² for 60-min coating), positive shift in corrosion potential (up to −0.281 V), increased polarization resistance (up to 1.13 × 10⁷ Ω cm²), and higher impedance modulus. The 60-min coating exhibited optimal performance. Enhanced corrosion resistance is attributed to increased coating thickness, the presence of a dense amorphous barrier layer inhibiting ionic ingress, and the protective synergy of the complex oxide mixture.

在等摩尔Hf-Nb-Ta-Zr难熔高熵合金（RHEA）上制备等离子体电解氧化（PEO）涂层，并分别在磷酸盐电解质中沉积20、40和60 min。随着氧化时间的延长，涂层厚度逐渐增大（4 ~ 7.5 μm），平均微孔尺寸略有增大（1.49 ~ 1.84 μm）。涂层主要由四方相ZrO2/HfO2、单斜相ZrO2/HfO2、Nb2O5和Ta2O5组成。辉光放电发射光谱（GDOES）显示，表面电解质元素富集（P， O， H, Na），涂层/衬底界面有明显的氢/磷峰。表面性能显著改善：显微硬度大幅提高（可达635.4 HV），疏水/疏油性提高，表面能降低（可达35.67 mJ/m2），附着强度增强（可达12.85 N）。与裸基板相比，所有PEO涂层在3.5 wt% NaCl溶液中的耐腐蚀性都得到了显著提高，腐蚀电流密度降低了两个数量级（60分钟涂层的最低icorr为2.12 × 10−9 a /cm2），腐蚀电位正偏移（高达- 0.281 V），极化电阻增加（高达1.13 × 107 Ω cm2），阻抗模量更高。60 min涂层效果最佳。增强的耐蚀性归因于涂层厚度的增加，抑制离子进入的致密无定形阻挡层的存在，以及复合氧化物混合物的保护协同作用。

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引用次数: 0

Temperature dependent resistivity changes of LaMnO3 modified CaCeNbMoO8 ceramics LaMnO3修饰CaCeNbMoO8陶瓷的电阻率随温度变化

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

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.10.079

Yinghao Li , Qiang Tu , Jingkang Feng , Yanqing Li , Lili Zhi , Aimin Chang , Zhilong Fu

The negative temperature coefficient (NTC) behaviors of (1-x)CaCeNbMoO₈-xLaMnO₃ (CCNMO -LMO) composite ceramics prepared by conventional sintering was regulated by increasing the content of CCNMO. The structure of the composite ceramics is composed of a tetragonal phase CaMoO₄, an orthorhombic phase LaMnO₃ and cubic phase Ca₂Nb₂O₇ and CeO₂. As LMO increases, cubic CeO₂ phase abnormally increases. The increased LMO phase content is beneficial for promoting the formation of the CeO₂ phase. The increased LMO phase content is beneficial for promoting the formation of the cubic CeO₂ phase. The appearance of the cubic CeO₂ phase can promote the regular change of temperature resistivity of composites, i.e., the linear relationship between the logarithmic resistivity (lnρ) and the inverse temperature (1000/T) is gradually enhanced. When x = 0.1 and 0.3, the relationship between lnρ and 1000/T of the composites exhibits a linear behavior and is expected to be a candidate material for high-temperature NTC thermistors devices applications in the273K–1373K temperature span.

通过增加CCNMO的含量来调节常规烧结制备的（1-x）CaCeNbMoO8-xLaMnO3 （CCNMO -LMO）复合陶瓷的负温度系数（NTC）行为。复合陶瓷的结构由四方相CaMoO4、正交相LaMnO3、立方相Ca2Nb2O7和CeO2组成。随着LMO的增加，立方CeO2相异常增加。LMO相含量的增加有利于促进CeO2相的形成。LMO相含量的增加有利于促进立方CeO2相的形成。立方CeO2相的出现促进了复合材料温度电阻率的规律性变化，即对数电阻率（lnρ）与逆温度（1000/T）之间的线性关系逐渐增强。当x = 0.1和0.3时，复合材料的lnρ与1000/T之间呈现线性关系，有望成为273k - 1373k温度范围内高温NTC热敏电阻器件应用的候选材料。

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引用次数: 0

Regularities of calcium dialuminate synthesis in the process of solid-phase synthesis from aluminum micro- and nanopowders 铝微粉和纳米粉固相合成双铝酸钙的规律

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

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.10.425

D. Tokarev , A. Mostovshchikov , A. Nikolaeva , O. Nazarenko

The synthesis of calcium dialuminate samples doped with manganese was carried out in this work. This material can be used as an inexpensive red fluorescent material for LED technology, as well as in building and construction for decorative purposes. The influence of the use of various inorganic manganese compounds (manganese carbonate, manganese sulfate, manganese oxide) as sources of activator ions, as well as the method of introducing the activator (mechanical dry mixing and introducing the activator solution) on the structure and luminescent properties of the resulting product was studied. The possibility and feasibility of using micron and nanopowders of aluminum for the synthesis of luminescent materials was assessed.

本文研究了掺杂锰的双铝酸钙样品的合成。这种材料可以用作LED技术的廉价红色荧光材料，也可以用于建筑和建筑装饰目的。研究了使用各种无机锰化合物（碳酸锰、硫酸锰、氧化锰）作为活化剂离子来源，以及引入活化剂的方法（机械干混和引入活化剂溶液）对产物结构和发光性能的影响。评价了利用微米级和纳米级铝粉合成发光材料的可能性和可行性。

引用次数: 0

Structural, magnetic, electrical, and dielectric properties of polyvinylidene fluoride–NiFe2O4 nanocomposites with enhanced β-phase formation 增强β相形成的聚偏氟乙烯- nife2o4纳米复合材料的结构、磁性、电学和介电性能

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

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.11.012

Manish Singh, Bharat K. Gupta, Deepash Shekhar Saini, Nikhil Kumar

Polyvinylidene fluoride (PVDF)– NiFe₂O₄ (NFO Nickel Ferrite) nanocomposites were synthesized by preparing NFO nanoparticles via sol–gel auto-combustion and incorporating them into PVDF through solution casting. X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR) analyses confirmed a significant enhancement of the electroactive β-phase, increasing from ∼37 % in pristine PVDF to 81.1 % and 84.1 % at 3 and 5 wt% NFO, before slightly decreasing to 82.2 % at 7 wt%. Field Emission Scanning Electron Microscopy (FESEM) images revealed that NFO served as an effective nucleating agent, refining the globular structure from ∼16.5 μm to ∼12.6 μm and enhancing homogeneity. Magnetic measurements revealed ferromagnetic behavior with saturation magnetization (Ms) rising from 8.4 emu/cc (3 wt%) to 40 emu/cc (7 wt%), while remanent magnetization increased from 5.3 to 22 emu/cc and coercivity remained at 0.1–0.2 T. Electrical studies (100 Hz–1 MHz, 40–120 °C) indicated enhanced ac conductivity via hopping conduction, following Jonscher's law and the Jump Relaxation Model. The dielectric constant (ε′) showed strong interfacial polarization, peaking at 3–5 wt% but declining at 7 wt% due to agglomeration. Impedance spectra confirmed NTCR behavior, with bulk resistance decreasing from ∼3527 MΩ at 40 °C to ∼34 MΩ at 120 °C. Modulus analysis indicated reduced electrode polarization and thermally activated relaxation shifting to higher frequencies. Overall, PVDF–NFO nanocomposites exhibit remarkable improvements in structural, magnetic, and electrical performance. Optimal NFO loading (3–5 wt%) maximizes β-phase formation, dielectric response, and magnetic strength, making these composites highly promising for flexible electronics, sensors, actuators, and magnetoelectric applications.

采用溶胶-凝胶自燃烧法制备NFO纳米颗粒，并通过溶液浇铸将其掺入PVDF中，合成了聚偏氟乙烯(PVDF) - NiFe2O4 （NFO镍铁氧体）纳米复合材料。x射线衍射（XRD）和傅里叶变换红外光谱（FTIR）分析证实了电活性β相的显著增强，在原始PVDF中从~ 37%增加到3和5 wt% NFO时的81.1%和84.1%，然后在7 wt% NFO时略微下降到82.2%。场发射扫描电镜（FESEM）图像显示，NFO作为一种有效的成核剂，将球状结构从~ 16.5 μm细化到~ 12.6 μm，并增强了均匀性。磁测量表明，饱和磁化强度（Ms）从8.4 emu/cc （3wt %）上升到40 emu/cc (7wt %)，而剩余磁化强度从5.3增加到22 emu/cc，矫顽力保持在0.1-0.2 t。电学研究（100 Hz-1 MHz, 40 - 120°C）表明，根据Jonscher定律和跳变弛豫模型，通过跳变传导增强了交流电导率。介电常数ε′表现出强烈的界面极化，在3-5 wt%处达到峰值，但在7 wt%处由于团聚而下降。阻抗谱证实了NTCR的行为，体电阻从40°C时的~ 3527 MΩ降至120°C时的~ 34 MΩ。模量分析表明电极极化减少，热激活弛豫向更高频率转移。总体而言，PVDF-NFO纳米复合材料在结构、磁性和电性能方面表现出显著的改善。最佳的NFO负载（3-5 wt%）使β相形成、介电响应和磁性强度最大化，使这些复合材料在柔性电子、传感器、执行器和磁电应用中非常有前途。

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引用次数: 0

Eu2+-doping induced phase transformation and blue–cyan luminescence in KAlSi3O8 phosphors Eu2+掺杂诱导KAlSi3O8荧光粉的相变和蓝绿色发光

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

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.11.104

Yang Luo , Maohua Wang , Yu Jiang , Long Chen , Yuebin Xu , Jiuyang He , Aierken Sidike

Cyan-emitting phosphors are essential to compensate for the emission gap of conventional white light-emitting diodes (WLEDs) in the 480–500 nm range, thus considerably increasing the color rendering index (Ra) and gamut coverage to achieve high-quality full-spectrum lighting. In this work, we developed a phase-tunable Eu²⁺-doped KAlSi₃O₈ multiphase phosphor via a solid-state reaction, in which controlled Eu²⁺ doping (0.000–0.040) induced a phase transition and generated dual emission centers, resulting in a remarkable redshift from 406 nm to 480 nm with a broadened full width at half maximum (FWHM) (67 → 177 nm) to cover the blue–cyan–green regions. The combination of a 365 nm near-UV (NUV) LED chip, KAlSi₃O₈:0.040Eu²⁺, and commercial red phosphor yields a white LED device with a high color rendering index (Ra) of 96.1 and chromaticity coordinates of (0.3276, 0.3350). These results demonstrate that this blue–cyan phosphor not only simplifies the fabrication process of white LEDs but also effect ively compensates for the cyan spectral gap, making it a promising candidate material for NUV phosphor-converted WLEDs.

青色发光荧光粉弥补了传统白光二极管（wled）在480-500 nm范围内的发射间隙，从而大大提高了显色指数（Ra）和色域覆盖范围，从而实现了高质量的全光谱照明。在这项工作中，我们通过固态反应开发了一种相位可调的Eu2+掺杂KAlSi3O8多相荧光粉，其中受控的Eu2+掺杂（0.000-0.040）诱导相变并产生双发射中心，导致从406 nm到480 nm的显著红移，半宽宽（FWHM）（67→177 nm）覆盖蓝绿色区域。将365nm近紫外（NUV） LED芯片KAlSi3O8:0.040Eu2+与商用红色荧光粉相结合，可获得显色指数（Ra）为96.1，色度坐标为（0.3276,0.3350）的白光LED器件。这些结果表明，这种蓝-青色荧光粉不仅简化了白光led的制造过程，而且有效地补偿了青色光谱间隙，使其成为一种有希望的超低紫外磷光转换wled的候选材料。

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引用次数: 0

Citrate-directed phase engineering of CdS-CdCO3@g-C3N4 heterojunctions for enhanced solar photocatalysis 柠檬酸盐导向的CdS-CdCO3@g-C3N4异质结相工程用于增强太阳能光催化

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

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.11.060

Ki-Seong Lim , Abhijit N. Kadam , Sang-Wha Lee

Identifying the key properties of photocatalysts and optimizing their heterojunction phase structures are indispensable for achieving efficient charge separation and improving solar-driven photocatalysis. Herein, the phase transformation and photocatalytic performance of CdS-based composites were investigated, focusing on the hexagonal (H) wurtzite and cubic (C) zinc blende structures formed with and without citrate addition, respectively. As-synthesized CdS with hexagonal and cubic crystalline phases was hydrothermally treated with g-C₃N₄ nanosheets (NSs), during which an additional phase of CdCO₃ spontaneously emerged around the CdS surface. This hydrothermal method led to the fabrication of ternary heterojunction composites, CdS(H)-CdCO₃@g-C₃N₄ and CdS(C)-CdCO₃@g-C₃N₄. The photocatalytic activity of CdS(H)-CdCO₃@g-C₃N₄ was 99.87 % towards methyl orange (MO) degradation (10 ppm, 100 mL) within 120 min under simulated solar light, which was 5.6 times higher performance than that of its cubic analog, highlighting the potential of the CdS(H)-CdCO₃@g-C₃N₄ for improving the photocatalytic activity of CdS-based composites under simulated solar light. The optimal degradation efficiency was achieved under operational conditions of initial MO pH ≈ 7, catalyst amount of 0.030 g/100 mL, and 10 ppm MO dye. This study emphasized the critical role of citrate additives in the formation and stabilization of hexagonal CdS structures for applications in green energy production and environmental remediation.

确定光催化剂的关键性质并优化其异质结相结构是实现高效电荷分离和改进太阳能驱动光催化的必要条件。本文研究了cds基复合材料的相变和光催化性能，重点研究了添加柠檬酸盐和未添加柠檬酸盐分别形成的六方(H)纤锌矿和立方(C)闪锌矿结构。用g-C3N4纳米片（NSs）对具有六方晶相和立方晶相的合成CdS进行水热处理，在此过程中，CdCO3在CdS表面自发出现。这种水热法制备了三元异质结复合材料CdS(H)-CdCO3@g-C3N4和CdS(C)-CdCO3@g-C3N4。在模拟太阳光下，CdS(H)-CdCO3@g-C3N4在120 min内降解甲基橙（10 ppm, 100 mL）的光催化活性为99.87%，是其立方模拟物的5.6倍，突出了CdS(H)-CdCO3@g-C3N4在模拟太阳光下提高CdS基复合材料光催化活性的潜力。在初始MO pH≈7、催化剂用量为0.030 g/100 mL、MO染料用量为10 ppm的操作条件下，获得了最佳的降解效率。本研究强调了柠檬酸盐添加剂在六方CdS结构的形成和稳定中的关键作用，并将其应用于绿色能源生产和环境修复中。

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引用次数: 0

High-temperature thermal conductivity and infrared emissivity of Sc2O3–Y2O3 co-stabilized ZrO2 ceramics for thermal protective coatings 热防护涂层用Sc2O3-Y2O3共稳定ZrO2陶瓷的高温导热系数和红外发射率

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

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.11.055

Chenxi Xia , Min Xie , Yonghe Zhang , Jianwei Xiao , Wenjun Yuan , Rende Mu , Zhigang Wang , Xiwen Song

Sc₂O₃-doped yttria-stabilized zirconia (YSZ) ceramics are considered a promising alternative to traditional YSZ ceramics due to their low thermal conductivity and excellent phase stability at elevated temperatures. However, the effect of varying Sc₂O₃ doping concentrations on their high-temperature thermal conductivity and infrared emissivity remains insufficiently investigated. In this study, the high-temperature solid-state reaction method was used to substitute Y₂O₃ with Sc₂O₃ in 8 % weight percent (8 wt%) YSZ at varying molar ratios. A series of Sc_xY_0.09−xZr_0.91O₂ ceramics (x = 0.02, 0.04, 0.06, 0.08) were synthesized and hereinafter referred to as Sc_xYSZ. At 1000 °C, increasing Sc₂O₃ content results in a reduction of the thermal conductivity of Sc_xYSZ ceramics, decreasing from 2.323 W m⁻¹ K⁻¹ in the undoped sample to 2.147 W m⁻¹ K⁻¹. Concurrently, the average infrared emissivity within the 3–5 μm wavelength range increases from 0.526 to 0.732. Ultraviolet–visible–near-infrared (UV–Vis–NIR) spectroscopy was used to determine the band gap energy (Eg), which decreased from 3.093 eV to 2.884 eV upon Sc₂O₃ doping. This reduction indicates that changes in carrier concentration play a significant role in modulating the infrared emissivity of Sc_xYSZ ceramics. Furthermore, the enhanced infrared emissivity corroborates the observed trend in thermal conductivity variation. These findings are of considerable importance for advancing the understanding of thermal shielding performance in thermal barrier coatings under high-temperature operating conditions.

sc2o3掺杂钇稳定氧化锆（YSZ）陶瓷由于其低导热性和在高温下优异的相稳定性被认为是传统YSZ陶瓷的一个有前途的替代品。然而，不同Sc2O3掺杂浓度对其高温导热系数和红外发射率的影响还没有得到充分的研究。在本研究中，采用高温固相反应方法，在8%重量% （8wt %）的YSZ中以不同的摩尔比用Sc2O3代替Y2O3。合成了一系列ScxY0.09−xzr0.910 o2陶瓷（x = 0.02, 0.04, 0.06, 0.08），以下简称scxyysz。在1000℃时，Sc2O3含量的增加导致ScxYSZ陶瓷的导热系数降低，从未掺杂样品的2.323 W m−1 K−1降低到2.147 W m−1 K−1。同时，3 ~ 5 μm波长范围内的平均红外发射率由0.526提高到0.732。用紫外-可见-近红外光谱（UV-Vis-NIR）测定了带隙能（Eg）， Sc2O3掺杂后带隙能从3.093 eV降低到2.884 eV。这表明载流子浓度的变化对ScxYSZ陶瓷的红外发射率有重要的调节作用。此外，红外发射率的增强证实了热导率变化的趋势。这些发现对于进一步了解热障涂层在高温工况下的热屏蔽性能具有重要意义。

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