Ceramics International最新文献

{"title":"In-situ synthesis of polyethylene glycol-assisted combined semiconductor metallic oxides nanocomposite for solar cell, supercapacitor, photocatalytic, and antibacterial applications","authors":"Yaseen Ayub ,&nbsp;Muhammad Akhyar Farrukh ,&nbsp;Sana Ben Khalifa ,&nbsp;Saleh Chebaane ,&nbsp;Refka Ghodhbani ,&nbsp;Mostafa A. Ismail ,&nbsp;Muhammad Ibrar ,&nbsp;Tauseef Munawar ,&nbsp;Suleyman I. Allakhverdiev","doi":"10.1016/j.ceramint.2025.06.177","DOIUrl":"10.1016/j.ceramint.2025.06.177","url":null,"abstract":"<div><div><span><span><span>The rapid development of industries and populations causes environmental and energy related critical issues worldwide. Regarding energy crisis and environmental pollution, electrochemical energy storage, solar energy production, and photocatalysis/antibacterial activity are the utmost attractive strategies for the sustainable environment and energy industry. In this work, we synthesized ternary metallic </span>oxide semiconductor structures PEG/NiO/CuO/ZnO (PNCZ) using polyethylene glycol as a capping agent in a sol-gel approach. The optical/structural properties of prepared nanocomposites were studied in detail using UV–vis and XRD/FT-IR analysis. The thermodynamic parameters were calculated using a TGA-DSC analysis. The prepared PNCZ nanocomposite displays 97 % and 99 % </span>photocatalytic<span> degradation of congo red (CR) and methylene blue (MB) dyes. The PNCZ composite also has good reusability for up to six cycles for CR dye. The prepared PNCZ nanocomposite positively responded against </span></span><em>S. aureus, P. aeruginosa,</em> and <em>E. coli</em> microbes with Zone of inhibition (ZOI) 2.9 cm, 1.8 cm, and 2.1 cm at 60 μL dosage. The PNCZ shows an extensive specific capacity of 3574 Cg^-1 at 1 A g⁻¹ and delivers a high specific energy of 75.52 Wh Kg⁻¹ at a specific power of 65 W kg⁻¹ with a capacitive retention of 96.5 % after 5000 cycles. PNCZ solar cell fabricated showed the highest efficiency of 7.4 % with V_OC of 10 V, J_SC of 8.24 mAcm⁻², and FF of 0.74 %. Our present finding proposes designing and fabricating more efficient composite materials for energy (supercapacitor, solar cells) and environmental (photocatalysis, antimicrobial agent) applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 39432-39444"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922349","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 Sm2O3 on the microstructure and piezoelectric properties of 0.28PIN-0.32PZN-0.1PZ-0.3 PT ceramics","authors":"Xiaoyu Xu ,&nbsp;Xiaoying Feng ,&nbsp;Xin Xu ,&nbsp;Liyang Zhou ,&nbsp;Hui Wang ,&nbsp;Bin Yan ,&nbsp;Jie Xu ,&nbsp;Feng Gao","doi":"10.1016/j.ceramint.2025.06.210","DOIUrl":"10.1016/j.ceramint.2025.06.210","url":null,"abstract":"<div><div>In this work, Sm₂O₃-doped 0.28PIN-0.32PZN-0.1PZ-0.3PT ceramics were synthesized by solid-state method. We systematically examined the influence of Sm₂O₃ concentration on the microstructure and electrical properties of the resulting samples. X-ray diffraction analysis indicated that all compositions retained the perovskite structure, with a minor pyrochlore phase emerging at higher Sm₂O₃ levels. Increasing Sm₂O₃<span> content promoted a phase transition from rhombohedral to tetragonal symmetry, causing samples to depart from the morphotropic phase boundary (MPB). The enhanced tetragonal fraction led to greater lattice distortion, hindering domain switching and thereby reducing piezoelectric<span> performance. Transmission electron microscopy (TEM) and piezoresponse force microscopy (PFM) characterization elucidated the mechanism by which an optimal Sm</span></span>₂O₃ doping (0.5 mol %) improved piezoelectricity: at this concentration, the piezoelectric coefficient (<em>d</em>₃₃<span>) reached 650 pC/N, the electromechanical coupling factor (</span><em>k</em>_p<span>) was 0.54, and the Curie temperature (</span><em>T</em>_c<span>) increased to 267 °C. These findings provide insight into extending the operational temperature range of piezoelectric ceramics for practical applications.</span></div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 39750-39758"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144921142","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":"Synergistic Si substitution and in-situ Al2O3 for enhanced mechanical and oxidation resistant properties of Ti3AlC2","authors":"Hui Li ,&nbsp;Faming Zhang ,&nbsp;Qifa Wan ,&nbsp;Weiwei Sun","doi":"10.1016/j.ceramint.2025.06.184","DOIUrl":"10.1016/j.ceramint.2025.06.184","url":null,"abstract":"<div><div>Herein, we used a synergistic strategy combining Si substitution in A-site and <em>in</em>-<em>situ</em> Al₂O₃ reinforcement to push the inherent limitation of Ti₃AlC₂. The Ti₃AlC₂<span> with 99.54 % purity and near-full density was fabricated, which serves as an ideal platform for MAX phase composites. The composition and microstructure of Ti</span>₃(Al_1-<em>x</em>,Si_<em>x</em>)C₂/Al₂O₃ (<em>x</em><span> = 0.05–0.2) were analyzed using XRD, SEM, and TEM. The results confirmed the successful synthesis of composites with designed </span><em>x</em><span> value. The formation mechanism revealed the evolution of intermetallic compounds and the forming process of Al</span>₂O₃<span><span><span><span>. DFT calculations investigated the atomic-scale interfacial structure and </span>electron distribution<span>. It demonstrates that Si substitution simultaneously improved the matrix strength and the </span></span>interfacial adhesion<span> energy, which achieves good Vickers hardness, </span></span>flexural strength<span>, and compressive strength<span>. The unique oxide scale of Ti</span></span></span>₃(Al_1-<em>x</em>,Si_<em>x</em>)C₂/Al₂O₃ composed of the inner Al₂O₃ layer and the outer SiO₂-TiO₂<span><span> mixture shows a cooperative protection mechanism. This dual-modification strategy shows synergistic superiority in improving the mechanical and oxidation </span>resistant properties of Ti</span>₃AlC₂.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 39486-39497"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922242","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":"Structural and electro-magnetic properties of Na2O-BaO-Al2O3-P2O5 glasses doped with CdO for sensors and magnetic storage devices","authors":"K.A. Aly ,&nbsp;H.A. Abo-Mosallam ,&nbsp;Ebrahim A. Mahdy ,&nbsp;Mohamad M. Ebrahium","doi":"10.1016/j.ceramint.2025.06.173","DOIUrl":"10.1016/j.ceramint.2025.06.173","url":null,"abstract":"<div><div><span>The role of CdO additions on the structural, magnetic, and electrical properties of the amorphous </span><strong>20</strong>Na₂O-25BaO-(15-x)Al₂O₃ -xCdO-40P₂O₅ (mol%) glasses with (0.0 <span><math><mrow><mo>≤</mo><mi>x</mi><mo>≤</mo></mrow></math></span><span><span> 15.0 mol%) has been investigated. The prepared glasses were characterized by using XRD, FTIR, and VSM approaches. The FTIR spectra revealed the presence of various structural groups with the forming of P-O-Cd bonds. Embedding the studied glass with CdO enhances its magnetic characteristics in an overlapping </span>magnetic field. Furthermore, the Ac conductivity (</span><span><math><mrow><msub><mi>σ</mi><mrow><mi>a</mi><mi>c</mi></mrow></msub></mrow></math></span><span>) and complex dielectric constant (real and imaginary) were studied at the 50–500 kHz range of frequency and 300–370 K temperature. The frequency dependence of </span><span><math><mrow><msub><mi>σ</mi><mrow><mi>a</mi><mi>c</mi></mrow></msub></mrow></math></span> is successfully described by the Almond-West formula relationship. The fitting parameters <span><math><mrow><msub><mi>σ</mi><mrow><mi>d</mi><mi>c</mi></mrow></msub><mo>,</mo><msub><mi>ω</mi><mrow><mi>h</mi><mi>f</mi></mrow></msub><mo>,</mo><mtext>and</mtext></mrow></math></span> n have been precisely estimated. Values of <span><math><mrow><msub><mi>σ</mi><mrow><mi>a</mi><mi>c</mi></mrow></msub></mrow></math></span> has been increasing with the increase of temperature and/or frequency. This would be expected due to CdO additions leading to a network made up of P₂O₅ and Al₂O₃<span> that may be broken up by CdO, forming non-bridging oxygens that make ion transport simpler. The values of the activation energies for </span><span><math><mrow><msub><mi>E</mi><mrow><mi>a</mi><mi>c</mi></mrow></msub></mrow></math></span>, <span><math><mrow><msub><mi>E</mi><mrow><mi>d</mi><mi>c</mi></mrow></msub></mrow></math></span>, and <span><math><mrow><msub><mi>W</mi><mi>M</mi></msub></mrow></math></span> are found to decrease with increasing CdO content. This evidence affirms that as Na⁺ (and Ba²⁺<span><span>) ions require less activation energy to hop between non-bridging oxygen sites, the ionic conductivity increases. As a result, these glasses can serve as </span>solid electrolytes<span> in batteries<span> or fuel cells, facilitating ion transport. Both the complex dielectric constant (real, </span></span></span><span><math><mrow><msub><mi>ε</mi><mn>1</mn></msub><mtext>,</mtext></mrow></math></span> and imaginary, <span><math><mrow><msub><mi>ε</mi><mn>2</mn></msub><mtext>,</mtext></mrow></math></span><span>), dielectric loss, </span><span><math><mrow><mi>tan</mi><mrow><mo>(</mo><mi>δ</mi><mo>)</mo></mrow><mtext>,</mtext></mrow></math></span> and material capacity, C_p<span> have been estimated and well discussed. These parameters incre","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 39390-39398"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922345","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":"Site substitution and tunable luminescence of Eu2+ activated Ba1-xSrxLiZn3(PO4)3 phosphor for plant growth","authors":"Wencong Yi ,&nbsp;Jiayong Si ,&nbsp;Junwei Tang ,&nbsp;Gemei Cai","doi":"10.1016/j.ceramint.2025.06.179","DOIUrl":"10.1016/j.ceramint.2025.06.179","url":null,"abstract":"<div><div><span>The regulation of emission wavelength, luminescence intensity, and thermal stability in phosphors is essential for plant growth applications. This study explores the site substitution and tunable luminescence of Eu</span>²⁺ in Ba_1-<em>x</em>Sr_<em>x</em>LiZn₃(PO₄)₃, where Ba is partially replaced by Sr. Initially, Eu²⁺ occupies only the Ba²⁺ site within a highly symmetrical crystal structure. As Sr²⁺ substitutes Ba²⁺<span><span>, a new emission band emerges at 420 nm, attributed to crystal field splitting and </span>centroid displacement changes. The local environment of the Eu</span>²⁺ has changed due to Sr²⁺ substitution for Ba²⁺. When <em>x</em><span> changing from 0 to 0.4, the emission peak red-shifts from 387 nm to 420 nm, with luminescence intensity reaching 485 % of the initial value. The incorporation of Sr</span>²⁺ induces cation disorder, broadening the band gap. This disorder enhances thermal stability, as evidenced by the luminescence intensity at 150 °C increasing from 60.5 % (<em>x</em> = 0) to 64.2 % (<em>x</em> = 0.4) relative to the initial intensity at 25 °C. The optimized B_0.59S_0.4LZP:0.01Eu²⁺<span><span> phosphor aligns well with plant pigment absorption spectra. Artificial plant growth experiments under natural and </span>LED supplementary light showed a 13.40 % increase in hydrocotyle vulgaris weight after 15 days, indicating the potential of B</span>_{0.99-<em>x</em>}S_<em>x</em>LZP:0.01Eu²⁺ as a blue phosphor for plant growth LEDs.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 39457-39467"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922351","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":"Achieving multicolor luminescence via Mn2+ single doped in simple CaCdGe7O16 particles for multimode anti-counterfeiting","authors":"Siyi Mo ,&nbsp;Xinyi Yang ,&nbsp;Sisi Liu ,&nbsp;Xinyu Wang ,&nbsp;Luoyun Zhang ,&nbsp;Zhen Guo ,&nbsp;Zhidong Ma","doi":"10.1016/j.ceramint.2025.06.251","DOIUrl":"10.1016/j.ceramint.2025.06.251","url":null,"abstract":"<div><div><span>The multicolor and multimode<span> luminescence material possess the advantages of multicolor, multimode luminescence, easy identification, so that it is widely concerned in the field of optical anti-counterfeiting and optical information<span> storage. Therefore, it is makes sense of that this study use the doping of a single luminescent center to regulate the color of the luminescent color instead of simple mixing of different materials to achieve multicolor multimode luminescence. The as-prepared versatile CaCdGe</span></span></span>₇O₁₆:Mn²⁺<span> luminescent microparticles<span><span> prepared by high-temperature solid-phase method. The luminescent microparticles reveal the color from blue to orange-red under 254 nm UV light, while the 410 nm </span>photoluminescence<span> (PL) is attributed to the photoluminescence of CaCdGe</span></span></span>₇O₁₆ (CCGO) host and 606 nm photoluminescence is attributed to the ⁴T₁ - ⁶A₁ transition of Mn²⁺. And revealing orange when 254 nm UV light is turned off or when 254 nm UV light is turned off and heated, along with the change of Mn²⁺ concentration (wavelength is 606 nm), due to the ⁴T₁ - ⁶A₁ transition of Mn²⁺<span>. Under 254 nm UV light irradiation for 4 min, the afterglow time of the materials was 16000 s. Based on these superior properties, this study designs the dynamic multicolor and multimode luminescence Quick Response (QR) code pattern and a binary pattern, which offers the anti-counterfeiting technology toward a wide variety of applications to a certain extent.</span></div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 40184-40192"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922828","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":"Structural evolution, electrical properties, and non-ohmic behavior of barium-doped CaCu3Ti4O12 ceramics synthesized via solid-state method","authors":"El Houcine Lahrar ,&nbsp;Abdechafik EL Harrak ,&nbsp;El Hassan Yahakoub ,&nbsp;Amine Bendahhou ,&nbsp;Hafida Essaoudi ,&nbsp;Abdessamad Faik","doi":"10.1016/j.ceramint.2025.06.244","DOIUrl":"10.1016/j.ceramint.2025.06.244","url":null,"abstract":"<div><div><span>Barium-doped calcium copper titanate ceramics Ca</span>_1-xBa_xCu₃Ti₄O₁₂<span> with x = 0, 0.05, 0.1 and 0.2 were synthesized by the conventional solid-state method. We studied the effects of substituting Ca for Ba in the perovskite compound CCTO on structural evolution and electrical responses by changing the value of x. Processing the results of X-ray diffraction analysis using the Rietveld refinement method revealed that all the powders of the compounds studied in this work present a single perovskite phase with cubic symmetry of the Im </span><span><math><mrow><mover><mn>3</mn><mo>‾</mo></mover></mrow></math></span><span> space group. SEM analysis<span> revealed that Ba doping promotes a reduction in grain size and a more uniform grain distribution. Complex impedance analysis highlighted a marked reduction in grain boundary resistance and an increase in relaxation time with Ba substitution. Dielectric measurements shows that all the doped ceramics have a lower dielectric permittivity value (ε</span></span>_r<span>) than CCTO, due to the low grain boundary resistivity of the barium-doped compounds. AC conductivity showed frequency-dependent behavior consistent with hopping conduction mechanism, while barium doping reduced conductivity, due probably to lower carrier mobility and finer grain size. The breakdown field (E</span>_b) and the non-linear coefficient (α) were significantly improved with Ba doping, reaching maximum values of 5.01 kV/cm and 7.45, respectively.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 40098-40107"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922813","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":"Optical and structural insights into Ta2O5/n-Si heterojunctions: detailed characterization and material properties","authors":"Ramazan Lök","doi":"10.1016/j.ceramint.2025.06.247","DOIUrl":"10.1016/j.ceramint.2025.06.247","url":null,"abstract":"<div><div><span>A detailed investigation into the physical and optical properties of Ta</span>₂O₅<span> thin films is essential for evaluating their potential in semiconductor applications. In this study, Ta</span>₂O₅<span> films were deposited via RF magnetron sputtering and thermally annealed at temperatures of as-deposited, </span><em>250,500,750</em> and <em>1000 °C</em>. Structural, optical, and electrical characterizations were performed using <span><em>XRD</em><em>, FTIR, AFM, UV–Vis</em></span> spectroscopy, and <em>C–V/G–V</em> measurements. <em>XRD</em><span><span> results showed that crystallinity improved, </span>defect density decreased, and grain size increased with rising annealing temperature. </span><em>FTIR</em> confirmed the formation of a SiO₂<span> interfacial layer around 1100 cm</span>⁻¹<em>,</em> which significantly reduced interface defects and leakage currents. <em>AFM</em> images revealed smoother surfaces and larger grains, particularly in the <em>1000 °C</em> annealed films. <em>UV–Vis</em> analysis using the Kubelka–Munk function demonstrated increased reflectance and a slight widening of the optical band gap from <em>4.</em>07 eV to <em>4.</em>13 eV, indicating sensitivity to grain size, crystal quality, and lattice strain. The <em>C–V</em> characteristics of as-deposited samples lacked distinct accumulation or inversion regions due to poor interface quality and high trap density. With increasing annealing temperature, <em>C–V</em> curves improved, corresponding to enhanced crystallinity and reduced defect states. Band-to-band transitions became dominant, and the barrier height (<em>Φ</em>_<em>B</em><span>) slightly decreased due to reduced interface states and improved charge transport. The effective charge density (</span><em>Q</em>_<em>eff</em>) and interface state density (<em>D</em>_<em>it</em>) decreased significantly with annealing, from <em>10</em>^<em>12</em> to <em>10</em>^<em>11</em> <em>cm</em>^{<em>−2</em>} and from <em>10</em>^<em>14</em> to <em>10</em>^<em>10</em> <em>eV</em>^{<em>−1</em>} <em>cm</em>^{<em>−2</em>}, respectively. These findings confirm that thermal treatment plays a crucial role in optimizing the structural and electronic properties of <em>Ta</em>_<em>2</em><em>O</em>_<em>5</em><span> thin films for advanced electronic devices.</span></div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 40131-40141"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922818","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":"Synergistic defect and interface engineering in Fe3O4/rGO Hybrids: Toward high-efficiency microwave absorbers with thickness-adaptive broadband effectiveness","authors":"Lan Zhang ,&nbsp;Wei Qiao ,&nbsp;Tao Sun ,&nbsp;Zhanjun Wu","doi":"10.1016/j.ceramint.2025.06.213","DOIUrl":"10.1016/j.ceramint.2025.06.213","url":null,"abstract":"<div><div><span>The growing demand for high-efficiency electromagnetic wave absorption and shielding materials has accelerated research into magnetic-carbon hybrid systems. This work presents a facile, environment-tunable, and cost-effective binary composite of Fe</span>₃O₄<span>/reduced graphene oxide (rGO) (FRG), fabricated through a three-step synthesis protocol that integrates ultrasonic dispersion, solvothermal reaction, and freeze-drying processes. Structural characterization confirms the uniform anchoring of Fe</span>₃O₄<span> nanoparticles<span> (average diameter: 13.05 nm) on rGO surfaces and their intercalation between rGO layers, with freeze-drying enhancing interfacial bonding and lower density of FRG. Defect analysis reveals that FRG exhibits a reduced defect distance (L</span></span>_D<span> = 3.65 nm) and higher defect density (n</span>_D = 2.45 × 10¹¹<span><span>) compared to GO, promoting dipole polarization and defect polarization. The </span>electromagnetic absorption<span> performance demonstrates a critical dependence on GO concentration: increasing GO content initially enhances, but eventually degrades performance due to a conductivity-permittivity imbalance. Optimized FRG with 11.25 wt% GO achieves a minimum reflection loss of −49.47 dB at 8.17 GHz (4.00 mm thickness), while a 2.50 mm thick sample exhibits broadband absorption (RL &lt; −10 dB) over 6.19 GHz (11.81–18.00 GHz). Furthermore, increasing FRG loading extends the RL &lt; −20 dB effective bandwidth. This work establishes a scalable strategy for designing lightweight binary microwave absorbers with coupled dielectric/magnetic loss mechanisms.</span></span></div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 39782-39793"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144921157","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":"Enhancing the welding joint strength of aluminum nitride ceramic and polycarbonate by micro-texture treatment","authors":"Fanshuo Jia,&nbsp;Dachao Sun,&nbsp;Guangjie Wang,&nbsp;Yayun Liu,&nbsp;Xue Jiang,&nbsp;Ning Jiang,&nbsp;Chuanyang Wang","doi":"10.1016/j.ceramint.2025.06.211","DOIUrl":"10.1016/j.ceramint.2025.06.211","url":null,"abstract":"<div><div><span><span>Ceramic microfluidic chips with high similarity to real bone have great potential in bone-related fields. Packaging the transparent polymer window on the top of the ceramic microfluidic chip makes it possible to monitor the internal conditions of the chip in real time. Thus, a dual wavelength </span>laser welding<span> method of joining aluminum nitride<span> (AlN) ceramics and polycarbonate<span> (PC) is proposed to achieve the high-strength joining of ceramics to polymers. The micro-textures are generated after micro-texture treatment on the AlN ceramic surface. Subsequently, AlN ceramic and PC are welded using dual wavelength laser welding. The influences of the micro-texture parameters and welding parameters on welding </span></span></span></span>joint<span> strength<span> are investigated. The results show that micro-texture parameters change the contact area at the welding joint, thus affecting the welding joint strength. The optimal micro-texture parameters are 200 μm of micro-texture size, 150 μm of micro-texture spacing and 200 μm of micro-texture depth. Under the optimal micro-texture parameter, the welding joint strength attends to 17.9 MPa. The appropriate welding parameters provide the PC with enough heat input to melt and bond with the micro-texture interface adequately. The optimal 980 nm laser power is 110 W, 1710 nm laser power is 15 W and welding speed is 2 mm/s.</span></span></div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 39759-39771"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144921155","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}