Ceramics International最新文献

{"title":"Facile fabrication of Y₂O₃-MgO nanocomposite transparent ceramics with enhanced optical properties","authors":"Liu Xiao-Jing ,&nbsp;Yang Hui ,&nbsp;Zhong Fu-Ping ,&nbsp;Xu Hou-Long ,&nbsp;Shi Zi-Yuan ,&nbsp;Wei Meng-Jia ,&nbsp;Yang Jie ,&nbsp;Lu Chen ,&nbsp;Li Wen-Yao ,&nbsp;Liang Tong-Xiang ,&nbsp;Jiang Hong-Hui","doi":"10.1016/j.ceramint.2025.01.514","DOIUrl":"10.1016/j.ceramint.2025.01.514","url":null,"abstract":"<div><div>In this study, we synthesized Y₂O₃-MgO composite nanopowders using yttrium nitrate hexahydrate and magnesium oxalate tetrahydrate as raw materials via a sol-gel self-combustion method. The resulting powders were processed through calcination, ball milling, isostatic pressing, and hot sintering to produce Y₂O₃-MgO nanocomposite transparent ceramics. Comprehensive analyses including XRD, FTIR, SEM, and EDS were conducted to evaluate the phase composition, particle morphology, size, and element distribution of the composite powders. The optimal mass ratio of Y₂O₃ to MgO was determined to be 100:60, and the calcination temperature was set at 850 °C, yielding powders with an average particle size of 55 nm and uniform element distribution. Ball milling for 12 h reduced the average particle size to 35 nm. Following hot pressing sintering at 1230 °C under 50 MPa, the ceramics achieved an infrared transmittance exceeding 80 % in the 4–6 μm wavelength range. The thermal conductivity was measured at 15.48 W/(m·K), hardness at 10.43 GPa, and fracture toughness at 2.63 MPa m^1/2. These findings highlight the potential of Y₂O₃-MgO nanocomposite ceramics for advanced optical and structural applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17415-17422"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Robust, fire-resistant, and thermal-stable HSMSS@SiBCN ceramic fiber membranes with blocked axial and radial heat transfer for high-temperature thermal superinsulation","authors":"Hongli Liu ,&nbsp;Kun Yu ,&nbsp;Wenjin Yuan ,&nbsp;Baojie Zhang ,&nbsp;Peng Chu ,&nbsp;Yuhao Liu ,&nbsp;Weiqiang Xie ,&nbsp;Shaojie Zhang ,&nbsp;Yao Song ,&nbsp;Wenjing Zu ,&nbsp;Chenghao Bian ,&nbsp;Ziyang Peng","doi":"10.1016/j.ceramint.2025.01.517","DOIUrl":"10.1016/j.ceramint.2025.01.517","url":null,"abstract":"<div><div>Ceramic nanofibers with robust mechanical properties, high-temperature resistance, and superior thermal insulation performance are promising thermal insulators used under extreme conditions. However, developing of ceramic fibers with both high-temperature thermal stability and excellent mechanical properties remains a significant challenge. Herein, a novel hollow SiO₂ microspheres (HSMS_S) - SiBCN ceramic fiber membranes (HSMS_S@SiBCN) with excellent high-temperature insulation effect was designed by electrospinning technology. The microstructure, phase composition, and thermal insulation properties of HSMS_S@SiBCN ceramic fiber membranes were investigated under various heat treatment temperatures. The results showed that HSMS_S form a stable closed cell structure inside the fiber, synchronously hindering the axial and radial heat transfer, and endowed it with excellent thermal insulation performance (∼0.0316 W m⁻¹ K⁻¹). In addition, the prepared porous SiBCN ceramic fiber membranes also exhibit good tensile properties and high-temperature thermal stability (≥1200 °C). This work provides a new solution for researching and developing high-temperature thermal protection materials for ultra high-speed aircraft.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17445-17452"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Monte Carlo simulation and comprehensive analysis of bismuth borate glasses: Structural, elastic, optical, and radiation shielding properties for radioactive waste management applications","authors":"K. Maheshvaran ,&nbsp;K. Kannan ,&nbsp;M. Vijayakumar ,&nbsp;C. Selvakumar ,&nbsp;S. Ram Atithya ,&nbsp;Abdullah G. Al-Sehemi ,&nbsp;Nagaraj Basavegowda","doi":"10.1016/j.ceramint.2025.01.537","DOIUrl":"10.1016/j.ceramint.2025.01.537","url":null,"abstract":"<div><div>Nuclear shielding efficacy of novel bismuth borate glass matrices was examined by methodically varying the altering proportions of Ca²⁺ and Ba²⁺ cations within a multicomponent glass composition: 60B₂O₃+15Na₂O+5Bi₂O₃+(20-x)CaO + xBaO (where x = 0, 5, 10, 15, and 20 wt%). The radiation protecting ability has been estimated and validated using Phy-X and Monte Carlo simulations using FLUKA algorithm to predict radiation attenuation behaviour under realistic conditions. Structural alterations in the glass specimens were identified and validated using FTIR and XRD investigations, indicating the influence of Ca²⁺ ions replacement with the Ba²⁺ modifiers onto the glass structure. Physical characteristics, including density and molar volume, influenced estimations of structural and elastic features, with the impact of modifiers highlighting the endurance and efficacy of the glass matrix as a possible shielding material. The addition of Ba²⁺ in place of Ca²⁺ improves the physical properties of these bismuth borate glasses by increasing rigidity and elastic behavior at moderate concentrations, while higher BaO content tends to decrease hardness and promote a more open network structure. Optical bandgap and Urbach energy values were determined from absorption spectra, whereas Urbach energy values showed the minimal structural disorder and increased homogeneity of the glass structure. The Monte Carlo simulation findings, together with actual Phy-X data, underline the improved efficiency of the synthesized bismuth borate glasses with the combination of Ba²⁺ and Ca²⁺ ions in radiation attenuation over a wider range of energy, presenting a possible path for enhanced nuclear radiation screening in numerous scenarios.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17641-17656"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation of highly dense glass-ceramic by sintering ultrafine CaO-MgO-Al2O3-SiO2-CaCl2 glass powder","authors":"Hong-Yang Wang,&nbsp;Shu-Qiang Jiao,&nbsp;Guo-Hua Zhang","doi":"10.1016/j.ceramint.2025.01.564","DOIUrl":"10.1016/j.ceramint.2025.01.564","url":null,"abstract":"<div><div>This work prepared a highly dense glass-ceramic (GC) by the powder sintering method. The ultrafine glass powder (<em>D</em>₅₀ = 1.07 μm) was uniaxially pressed at 50 MPa and heat treated at 875–950 °C for densification and crystallization. According to the XRD results (X-ray diffraction analysis), the as-prepared GC was comprised of augite and anorthite. The crystallinity of GC was ranged from 1 to 90 % by changing the sintering temperature and time. It was found that increasing the crystallinity improved the bending strength, Vickers hardness, and fracture toughness of the GC provided that the crystallization did not cause an increase in porosity. The use of ultrafine powder promoted the densification and microstructure uniformity of GC. Sample sintered at 925 °C for 2 h exhibited a high crystallinity (78 %) and a low porosity (&lt;0.1 vol%), thus showing the highest bending strength and Vickers hardness of 201 MPa and 6.82 GPa, respectively.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17919-17927"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Significantly reduced thermal conductivity through dual-site high-entropy strategy in rare-earth hexaaluminates","authors":"Lin Zhou,&nbsp;Ji-Xuan Liu,&nbsp;Pai Peng,&nbsp;Qinghong Zhang,&nbsp;Guo-Jun Zhang","doi":"10.1016/j.ceramint.2025.01.520","DOIUrl":"10.1016/j.ceramint.2025.01.520","url":null,"abstract":"<div><div>LaMgAl₁₁O₁₉ (LMA) is an important thermal barrier coating (TBC) material due to its remarkable fracture toughness, excellent sintering resistance and better thermal stability, but the relatively high thermal conductivity limits its application. In this work, single-site high-entropy rare-earth hexaaluminates (La_0.2Nd_0.2Sm_0.2Eu_0.2Gd_0.2)MgAl₁₁O₁₉ (HE-L), La(Mg_0.2Co_0.2Ni_0.2Cu_0.2Zn_0.2)Al₁₁O₁₉ (HE-M) and dual-site high-entropy rare-earth hexaaluminates (La_0.2Nd_0.2Sm_0.2Eu_0.2Gd_0.2)(Mg_0.2Co_0.2Ni_0.2Cu_0.2Zn_0.2)Al₁₁O₁₉ (HE-LM) ceramics were successfully fabricated by solid-state reaction sintering, and their phase evolution process, mechanical and thermal properties were analyzed. The phase evolution process for the high-entropy rare-earth hexaaluminate is similar to that of the single-component LMA. The dual-site HE-LM ceramic exhibits a significant increase in Vickers hardness (13.63 GPa), fracture toughness (4.18 MPa‧m^1/2) and a decrease in thermal conductivity (2.02–2.55 W·m⁻¹·K⁻¹, 25–1100 °C) as compared to the LMA ceramics. This work demonstrates the excellent mechanical and thermophysical properties of the HE-LM ceramics. It is expected that the high-entropy rare-earth hexaaluminates will be a promising candidate for TBC.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17473-17483"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Designing innovative Zn3(VO)4/BiVO4 heterojunction for enhanced photodegradation under solar irradiation","authors":"Sovela Baig ,&nbsp;Muhammad Danish Khan ,&nbsp;Masood ul Hassan Farooq ,&nbsp;Iqra Fareed ,&nbsp;M. Yasir Rafique ,&nbsp;Sitara Baig ,&nbsp;Areej Zubair ,&nbsp;Hafiza Sadia Anam ,&nbsp;Zulfiqar Ali","doi":"10.1016/j.ceramint.2025.01.526","DOIUrl":"10.1016/j.ceramint.2025.01.526","url":null,"abstract":"<div><div>The design of hybrid photocatalysts has gained significant attention as an innovative strategy to enhance the separation of photogenerated charge carriers, thereby boosting photocatalytic efficiency. Herein, nanocomposites comprising of zinc vanadate and bismuth vanadate in varying proportions are synthesized via co-precipitation method to evaluate their potential in degrading organic dyes. Among the synthesized composites, ZBVO-60 demonstrates optimal performance, achieving 96.92 % degradation of methylene blue (MB) with a rate constant of 0.0191 min⁻¹ and 95.63 % degradation of methyl green (MG) with k = 0.0148 min⁻¹ upon solar irradiation. The superior photocatalytic efficiency is attributed to its enhanced light absorption, supported by narrow bandgap of 2.23 eV, decreased charge transfer resistance and efficient transport of photogenerated carriers at the interface. Moreover, the activation energy on the account of Arrhenius equation is noted to be 59.55 J/mol for MB and 97.83 J/mol for MG. ⋅OH is identified as the primary contributors to degradation in reactive-species trapping experiments, while Z-scheme mechanism is proposed to elucidate the charge transfer and separation dynamics. The stability tests confirm robustness of ZBVO-60, with negligible variations in photocatalytic efficiency across 5 cycles. These findings underscore the capability of hybrid as promising and sustainable photocatalysts for wastewater treatment and environmental remediation applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17535-17546"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of gadolinium doping on the structural, morphological, vibrational, and optical properties of β−Ga2O3: A solid-state combustion approach","authors":"Abhishek Sharma,&nbsp;Vir Singh Rangra","doi":"10.1016/j.ceramint.2025.01.532","DOIUrl":"10.1016/j.ceramint.2025.01.532","url":null,"abstract":"&lt;div&gt;&lt;div&gt;This study explores the synthesis and comprehensive characterization of gadolinium (Gd)-doped &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;β&lt;/mi&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Ga&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; nanoparticles, prepared for the first time via the solid-state combustion method, with Gd doping concentrations of 1%, 2%, and 3%. To date, no prior studies have reported the successful synthesis of Gd-doped &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;β&lt;/mi&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Ga&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; using this method. X-ray diffraction (XRD) analysis confirmed the retention of the monoclinic crystal structure, with &lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;Gd&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; ion incorporation leading to peak broadening, reduced intensity, and shifts to higher &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mi&gt;θ&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; angles. These changes, validated through Scherrer and Williamson–Hall analyses, are attributed to lattice strain, reduced crystallite size, and structural distortion induced by substituting smaller &lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;Ga&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; ions (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;62&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mtext&gt;Å&lt;/mtext&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;) with larger &lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;Gd&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; ions (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;93&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mtext&gt;Å&lt;/mtext&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;). Morphological analysis using field emission scanning electron microscopy (FESEM) revealed polydispersed nanoparticles with irregular shapes and a decrease in particle size with increasing Gd concentration. Energy-dispersive spectroscopy (EDS) confirmed the stoichiometric incorporation of Gd ions into the &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;β&lt;/mi&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Ga&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; lattice. Raman and Fourier-transform infrared (FTIR) spectroscopy showed reduced intensities, peak broadening, and shifts to higher wavenumbers, indicating increased lattice distortion and strain. UV–Vis spectroscopy demonstrated a reduction in the optical bandgap from 4.6 eV for pure &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;β&lt;/mi&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Ga&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; to 4.11 eV for 1% Gd doping, with minor increases to 4.16 eV and 4.18 eV at 2% and 3% doping, respectively. This narrowing of the bandgap is attributed to the introduction of defect states within the bandgap, facilitating electronic transitions at lower energies. Photoluminescence (PL) spectra revealed broad emission bands in the 400-600 nm range, with deconvolution identifying prominent p","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17583-17592"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ZnS@Co(OH)2 nanostructured materials with high-performance energy storage and superior electrocatalytic activity","authors":"Hong-Sheng Chu ,&nbsp;Dong-Mei Ma ,&nbsp;Fufa Wu ,&nbsp;Rong-Da Zhao ,&nbsp;Jun Xiang ,&nbsp;Li-fen Li ,&nbsp;Xingming Zhao ,&nbsp;Tianlin Wang","doi":"10.1016/j.ceramint.2025.01.536","DOIUrl":"10.1016/j.ceramint.2025.01.536","url":null,"abstract":"<div><div>This paper reports the synthesis of Co(OH)₂ nanowires on a ZnS substrate with a multi-layer structure using a multi-step hydrothermal method. Co(OH)₂ nanowires can increase the charge transfer rate and provide more electron storage space and reactive sites with the substrate of ZnS nanosheets. The results showed that at a current density of 1 A/g, the GCD charge-discharge curve of the ZnS@Co(OH)₂ electrode reached 2305 s, with a specific capacitance of 1063 F/g. The supercapacitor assembled demonstrated an energy density of 52.92 Wh/kg at a power density of 980 W/kg, maintaining 83.3 % of its capacity after 6000 charge-discharge cycles. At an overpotential of 219.2 mV, the HER current density reached 50 mA/cm². Additionally, the ZnS@Co(OH)₂ electrode remained stable after 12 h of hydrogen evolution reaction, showing promise as a material for both energy storage and electrocatalytic hydrogen production systems.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17630-17640"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and fabrication of enhanced room temperature NH3 sensors based on Sn-doped WO3 thin films deposited using nebulizer spray pyrolysis technique","authors":"S. Vinoth ,&nbsp;Inigo Valan Isaiarasu ,&nbsp;R.S. Rimal Isaac ,&nbsp;A. Vimala Juliet ,&nbsp;Aayesha Sagir Khan ,&nbsp;Ashwani Kumar ,&nbsp;Mohd Shkir","doi":"10.1016/j.ceramint.2025.01.515","DOIUrl":"10.1016/j.ceramint.2025.01.515","url":null,"abstract":"<div><div>The growing need for effective room temperature (RT) NH₃ gas sensors stems from potential health risks associated with NH₃ exposure. This research introduces WO₃:Sn (0–5 wt%) thin films, prepared via nebulizer-assisted spray pyrolysis, as novel NH₃ sensing materials. The crystallite structure analysis confirmed the hexagonal crystal structure of WO₃ films, with 3 wt% Sn-doping showing increased crystallinity. The morphological study revealed a unique mesh-like porous surface morphology in Sn-doped films, conducive to gas adsorption/desorption processes. Optical analysis showed bandgap reduction in WO₃ thin films up to 3 wt% doping. Photoluminescence (PL) study confirms the increase in oxygen related defect states (i.e oxygen vacancies (O_v) for the 3 wt% doping in WO₃. The WO₃:Sn (3wt%) sensor demonstrated superior performance, with exceptionally high gas response of 552 and low response/recovery times of 8.1 s/5.4 s to 250 ppm NH₃ at room temperature. The study briefly discusses the gas sensing mechanism in n-type WO₃ and compares the present results with previously reported WO₃-based NH₃ sensors for their suitability in the application of commercial gas sensors.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17423-17432"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancement of tin-doping on the structural, electrical, and optical properties of copper oxide thin films for optoelectronic applications","authors":"Isra Stambouli ,&nbsp;Madiha Zerouali ,&nbsp;Radouane Daïra ,&nbsp;Dikra Bouras ,&nbsp;Gamal A. El-Hiti ,&nbsp;Souren Grigorian ,&nbsp;Mamoun Fellah","doi":"10.1016/j.ceramint.2025.01.540","DOIUrl":"10.1016/j.ceramint.2025.01.540","url":null,"abstract":"<div><div>This study investigates the structural, optical, and electrical properties of Sn-doped CuO thin films, which were synthesized using a simple solution-based method. X-ray diffraction (XRD) analysis confirmed that the doping of Sn did not induce phase transitions in CuO, as the films maintained the monoclinic structure. The crystallite size decreased from 90 nm for the un-doped sample to 37 nm for the film doped with 5 % Sn. Scanning electron microscopy (SEM) revealed that the Sn doping affected both the grain size and morphology, leading to a reduction in average grain size from 1.2 μm to 0.8 μm as the Sn concentration increased. Raman spectroscopy revealed that the characteristic Cu-O vibrational modes (Ag and Bg) remained consistent, indicating there were no significant changes to the crystal structure. Optical analysis showed a reduction in the bandgap of CuO films, decreasing from 4.03 eV for the undoped sample to 1.5eV for that doped with 5 wt% Sn. This reduction was accompanied by a redshift in the absorption edge, which can be attributed to the introduction of defect states and structural modifications. The electrical resistivity significantly decreased with increasing concentration of Sn, dropping from 380 Ω cm for the un-doped sample to 156 Ω cm at 5 wt% Sn. This reduction suggests that the introduction of free carriers enhances conductivity. These findings highlight the potential of Sn-doped CuO thin films for applications in optoelectronic devices, such as gas sensors and photovoltaics, by enhancing both optical and electrical properties while maintaining structural integrity.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17689-17703"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}