Ceramics International最新文献

{"title":"Heterointerfacial engineered NdBaCo2O5+δ/BaCo0.8Ta0.2O3−δ composite cathodes with mitigated thermal expansion and accelerated ORR kinetics for IT-SOFCs","authors":"Qingyuan Sheng,&nbsp;Jiahui Zhu,&nbsp;Xiaofei Zhu,&nbsp;Qiwei Chen,&nbsp;Shangyu Li,&nbsp;Wenfu Yan,&nbsp;Defeng Zhou,&nbsp;Jinghe Bai","doi":"10.1016/j.ceramint.2026.07.345","DOIUrl":"10.1016/j.ceramint.2026.07.345","url":null,"abstract":"<div><div>Improving the oxygen reduction reduction activity and thermal stability of cathode materials is critical to advancing the commercialization of intermediate-temperature solid oxide fuel cells (IT-SOFCs). In this study, a high-performance mixed ionic-electronic conductor (MIEC) BaCo_0.8Ta_0.2O_3-δ phase is incorporated into the lattice of NdBaCo₂O_5+δ (NBC) double perovskite. Such composite construction elevates the oxygen vacancy concentration, lowers the thermal expansion coefficient (TEC) of NBC-based materials, and simultaneously improves electrocatalytic activity and long-term operational durability of IT-SOFCs. By fitting the distribution of relaxation times, it is concluded that the composite cathode material (NBC&amp;BCT2) significantly accelerates the oxygen dissociation and adsorption kinetics compared with NBC. At 700 °C, the symmetric cell with NBC&amp;BCT2 exhibits an area-specific resistance of only 0.034 Ω cm², approximately 23% of that of NBC. When used as the cathode in IT-SOFCs, the NBC&amp;BCT2-based cells achieve a maximum power density of 1.01 W cm² at 700 °C, which is 1.4 times higher than that of NBC. Furthermore, composite modification with BCT alleviates the long-term stability drawbacks originating from the excessively high TEC of Co-based materials. Single cells equipped with NBC&amp;BCT2 maintain stable operation over 100 h under a constant rated voltage, with an output current density 1.5 times higher than that of NBC-based cells. This work establishes a reliable modification strategy to promote the electrocatalytic performance of Co-based perovskites and resolve stability limitations induced by high TEC.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 25","pages":"Pages 44677-44686"},"PeriodicalIF":6.0,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149174991","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 Al2O3/SiO2 mass ratio on the microstructure and properties of boron aluminosilicate glass used for high-performance glass fibers","authors":"Qingqing Yang,&nbsp;Yue Mi,&nbsp;Cong Ao,&nbsp;Zhehui Sun,&nbsp;Yanbo Cheng,&nbsp;Qinghuang Zhang,&nbsp;Binchang Zhang,&nbsp;Lixiong Han,&nbsp;Dehua Xiong","doi":"10.1016/j.ceramint.2026.07.452","DOIUrl":"10.1016/j.ceramint.2026.07.452","url":null,"abstract":"<div><div>This study investigates the effects of Al/Si mass ratio on the structure and properties of boron aluminosilicate glass under aluminum-rich conditions, as well as the influence of forming process adjustments on fiber drawability. The results reveal that, with decreasing Al₂O₃/SiO₂ mass ratio from 0.34 to 0.20, the amount of Al-containing structural units is reduced, which modifies the modifier-assisted charge-compensation balance among Al- and B-centered units. Since both [AlO₄]^- and [BO₄]^- units require charge compensation by modifier cations such as Ca²⁺ and Mg²⁺, the reduced Al content is associated with a decrease in higher-coordinated Al contributions and an increase in tetrahedrally coordinated Al contribution. Meanwhile, the charge-compensation environment becomes more favorable for stabilizing [BO₄]^- units, leading to an increase in the [BO₄] fraction. As a result, the flexural strength of the glass improves from 114.3 MPa to 146.0 MPa, while the dielectric constant and dielectric loss decrease from 4.75 to 4.37 and from 3.99 × 10⁻³ to 1.86 × 10⁻³ at 10 GHz, respectively. The optimal comprehensive performance is achieved at an Al₂O₃/SiO₂ mass ratio of 0.20, where the glass exhibits both low dielectric constant (4.37 at 10 GHz) and favorable mechanical strength (146.0 MPa). Additionally, laboratory-scale fiber drawing experiments were performed for the optimized AS-4 composition. The fiber diameter decreased with increasing drawing temperature under fixed drawing conditions, and the smaller-diameter fibers exhibited higher single-filament tensile strength. This work provides insights into the composition-structure-property relationships in low-dielectric glass fibers and offers a processing strategy for performance optimization.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 25","pages":"Pages 45773-45785"},"PeriodicalIF":6.0,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149174994","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 Fe addition on microstructure and mechanical properties of SiC joint brazed with Ti-42Si filler","authors":"Renxin Li,&nbsp;Jiang Wu,&nbsp;Liang Wang,&nbsp;Haojiang Shi,&nbsp;Qi Wu,&nbsp;Yuping Xiao,&nbsp;Huabei Peng,&nbsp;Wenbo Liu,&nbsp;Ning Li,&nbsp;Jiazhen Yan","doi":"10.1016/j.ceramint.2026.07.268","DOIUrl":"10.1016/j.ceramint.2026.07.268","url":null,"abstract":"<div><div>Although a TiSi brazing filler reacts in situ with SiC to form a Ti₃SiC₂ phase, the required brazing temperature (&gt;1500 °C) can damage the fibres in SiC_f/SiC composites. Therefore, this study employs an Fe microalloying strategy to reduce brazing temperatures, elucidates the mechanism of SiC joint formation, and investigates the effects of Fe content on brazing processability, microstructure of the brazed joint and high-temperature mechanical properties. Research indicates that dense SiC joints were achieved at 1400 °C for 10 min. The brazed seam primarily consists of high-melting-point Ti₃SiC₂ and FeSi₂Ti phases, ensuring the joint's high-temperature mechanical properties. When the Fe content in the brazing filler is 8 wt%, the shear strength of the joint at room temperature reaches 93 ± 16 MPa, and the shear strength can be maintained at 43 MPa at 1300 °C. After undergoing oxidation treatment at 1200 °C for 10 h and thermal shock treatment at 1200 °C for 10 cycles, the shear strength of the SiC joints brazed with Ti-Si-Fe brazing filler stabilized at 48 MPa and 68 MPa, respectively, demonstrating excellent comprehensive high-temperature service performance.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 24","pages":"Pages 43794-43804"},"PeriodicalIF":6.0,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149071196","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":"Effective construction of S-scheme PtO/SrTiO3 heterojunction photocatalyst for visible-light catalytic degradation of tetracycline antibiotic","authors":"Mona A. Alenezi,&nbsp;Maha Alhaddad,&nbsp;Naif S. Aljohani,&nbsp;Abdulrahman Abdullah Abutaleb,&nbsp;Fatehy M. Abdel-Haleem,&nbsp;Ahmed Shawky,&nbsp;Reda M. Mohamed","doi":"10.1016/j.ceramint.2026.07.233","DOIUrl":"10.1016/j.ceramint.2026.07.233","url":null,"abstract":"<div><div>Developing a novel photocatalytic system to tackle the challenging limitations of the conventional routes is crucial to effectively eliminate antibiotic residuals. Herein, a series of porous PtO/SrTiO₃ S-scheme heterostructure photocatalysts with varying PtO contents was efficiently synthesized using a modified sol-gel technique, followed by wet impregnation and annealing. The synthesized heterojunctions were systematically characterized via several analytical tools (XRD, XPS, FE-SEM, TEM, UV-vis DRS, PL, etc.) and employed for tetracycline oxidation under visible illumination. Results demonstrated the successful decoration of the SrTiO₃ perovskite phase with PtO nanoparticles (NPs), which synergistically enhanced its physicochemical, optical, photoelectrochemical, and catalytic properties. The energy band gap decreased from 3.07 eV (SrTiO₃) to 2.74 eV (3.0 wt% PtO/SrTiO₃), leading to a redshift of the light absorption edge from 404 nm to 451 nm. The decoration of SrTiO₃ with 3.0 wt% PtO significantly reduced its PL intensity by approximately threefold. Moreover, the electron lifetime (τ) was augmented from 0.92 ms (SrTiO₃) to 1.59 ms (3.0 wt% PtO/SrTiO₃. These findings indicated a superior spatial separation of photoinduced carriers after 3.0 wt% PtO loading. Therefore, the optimized 3.0 wt% PtO/SrTiO₃ succeeded in eliminating ∼100% of tetracycline within 90 min under visible illumination, at a rate of 2.4480 μM min⁻¹, which was greater than that obtained utilizing pure SrTiO₃ (0.0211 μM min⁻¹) by ∼70.8-fold. Additionally, the 3.0 wt% PtO/SrTiO₃ showcased superior ability to be recovered and reused for five experimental cycles, affirming its excellent stability/durability for various sustained applications. Overall, the rational design of a novel mesoporous PtO/SrTiO₃ S-scheme heterojunction was well clarified, and its role in enhancing the photodegradation of tetracycline was thoroughly studied. This study presents a novel perspective on an efficient method for sustained elimination of harmful organic substances, thereby mitigating environmental harm and promoting sustainable use.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 24","pages":"Pages 43479-43491"},"PeriodicalIF":6.0,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149071479","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":"Guiding micro-arc discharge via a built-in conductive network for controllable sintering of ceramic coatings","authors":"Hongjian Huang,&nbsp;Yonggang Wang,&nbsp;Yuan Wan,&nbsp;Hongyu Peng,&nbsp;Manxi Sun","doi":"10.1016/j.ceramint.2026.07.248","DOIUrl":"10.1016/j.ceramint.2026.07.248","url":null,"abstract":"<div><div>Micro-arc sintering (MAS) is a novel technology that utilizes plasma discharge to rapidly convert silicate pre-coatings on metal surfaces into ceramic coatings. Compared with traditional micro-arc oxidation (MAO), the MAS process offers a higher coating growth rate and lower energy consumption, demonstrating considerable application potential. However, in the initial stage of MAS, the low-energy plasma discharge passively generated by coating defects causes structural damage to the forming coating. In this work, an aluminum-modified micro-arc sintering (AMMAS) technology was proposed. Specifically, a conductive network was constructed during MAS by doping Al microparticles into the silicate pre-coating to actively guide the plasma discharge. The discharge mode was transformed from vertically centralized bombardment into a network-like discharge, enabling the fabrication of a dense and smooth AMMAS coating approximately 100 μm thick within 10-15 min. Moreover, the friction coefficient of the AMMAS coating is as low as ∼0.25, and its wear cross-sectional area is only ∼0.00784 mm², which is one order of magnitude lower than that of MAS coatings (∼0.0857 mm²). Meanwhile, the AMMAS coating achieved a remarkably low corrosion current density of 3.45 × 10⁻⁸ A cm⁻² in a 3.5 wt% NaCl solution, which is approximately 1/23 of that of the MAS coating (7.84 × 10⁻⁷ A cm⁻²). Overall, the proposed AMMAS technology establishes a new approach for efficiently preparing thick ceramic coatings by regulating plasma discharge through a pre-coating.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 24","pages":"Pages 43623-43638"},"PeriodicalIF":6.0,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149071491","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, elastic, magnetic, magnetocaloric, and critical properties of Bi-substituted Cu0.5Cd0.5Fe2-xBixO4 ferrites prepared by sol–gel synthesis","authors":"Chiheb Azri,&nbsp;Sobhi Hcini,&nbsp;Fikria Jabli,&nbsp;E.K. Hlil,&nbsp;Abdulrahman Mallah,&nbsp;Mohamed Lamjed Bouazizi,&nbsp;Abdessalem Dhahri,&nbsp;Rached Ben Younes","doi":"10.1016/j.ceramint.2026.07.206","DOIUrl":"10.1016/j.ceramint.2026.07.206","url":null,"abstract":"<div><div>A series of Cu_0.5Cd_0.5Fe_2-xBi_xO₄ spinel ferrites with x = 0, 0.05, and 0.1 was synthesized by the sol–gel technique in order to assess the influence of Bi³⁺ substitution on their XPS, structural, elastic, magnetic, magnetocaloric, and critical characteristics. The oxidation states and lattice-site distributions of the metal cations were characterized via X-ray photoelectron spectroscopy (XPS). X-ray diffraction (XRD) and Rietveld refinement confirmed a cubic spinel structure (<span><math><mrow><mi>F</mi><mi>d</mi><mover><mn>3</mn><mo>‾</mo></mover><mi>m</mi></mrow></math></span>), with a secondary Bi₂O₃ phase detected in the Bi-substituted compositions (x = 0.05 and 0.10). Lattice parameters, crystallite size, and X-ray density increased with x, attributed to the larger ionic radius of Bi³⁺. Infrared spectroscopy and derived elastic constants revealed a significant enhancement in lattice stiffness, force constants, and Debye temperature, indicating strengthened interatomic bonding. Magnetization measurements showed a decrease in Curie temperature (<em>T</em>_C) and magnetization with increasing Bi concentration, due to the dilution of Fe³⁺–O²⁺–Fe³⁺ superexchange interactions by non-magnetic Bi³⁺ ions. The ferrimagnetic–paramagnetic transition remains of second order, as confirmed by the Arrott plot analysis. Under an applied magnetic field of 5 T, the maximum magnetic entropy change (<span><math><mrow><mo>|</mo><mrow><mo>Δ</mo><msubsup><mi>S</mi><mi>M</mi><mi>max</mi></msubsup></mrow><mo>|</mo></mrow></math></span>) and the relative cooling power (RCP) reach 1.67 J kg⁻¹ K⁻¹ and 115 J kg⁻¹, respectively, for the undoped sample (x = 0), and both quantities systematically decrease with increasing Bi substitution. Critical exponent analysis, employing modified Arrott plots and the Kouvel-Fisher method, demonstrated that the phase transition belongs to the three-dimensional Heisenberg universality class (<em>β</em> = 0.365, <em>γ</em> = 1.336, <em>δ</em> = 4.8). Moreover, increasing Bi content leads to a systematic decrease in <em>β</em> and increase in <em>γ</em> and <em>δ</em>, reflecting enhanced critical spin fluctuations due to the progressive magnetic dilution of the Fe³⁺ sublattice by non-magnetic Bi³⁺ ions.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 24","pages":"Pages 43180-43198"},"PeriodicalIF":6.0,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149071644","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":"Enhanced sintering behavior and dielectric performance in ZnZrTa2O8 through dual ions substitution strategy","authors":"Chaomin Yin,&nbsp;Hao Yuan,&nbsp;Yun Zhang,&nbsp;Lan Gao,&nbsp;Liang Shi,&nbsp;Xinghua Zhu,&nbsp;Shihua Ding","doi":"10.1016/j.ceramint.2026.07.211","DOIUrl":"10.1016/j.ceramint.2026.07.211","url":null,"abstract":"<div><div>ZnZr_1-<em>x</em>(Ga_1/2Ta_1/2)_<em>x</em>Ta₂O₈ and ZnZr_1-<em>y</em>(Al_1/2Nb_1/2)_<em>y</em>Ta₂O₈ were designed in this work. All components retained single monoclinic wolframite structure. (Al_1/2Nb_1/2)⁴⁺ doping decreased the sintering temperature from 1400 °C to 1350 °C with relative density reaching up to 97.53%. Based on Phillips-Van Vechten-Levine (<em>P</em>-<em>V</em>-<em>L</em>) chemical bond theory, the dependence of structure on properties was analyzed. Compared to ionic polarizability, bond ionicity dominated the <em>ε</em>_<em>r</em> variations. ‌Internal loss and external loss exhibited equivalent contributions‌ to <em>Q</em>×<em>ƒ</em> enhancement, from 77,256 GHz at <em>x</em> = 0 to 92,814 GHz at <em>x</em> = 0.04 (95,368 GHz, at <em>y</em> = 0.06). Importantly, (Al_1/2Nb_1/2)⁴⁺ doping enabled the temperature coefficient |<em>τ</em>_ƒ| to meet practical application standard. It was explained from the structural perspective, through calculating oxygen bond valence <em>V</em>_<em>O</em>. Upon sintering at 1400 °C, the ZnZr_0.96(Ga_1/2Ta_1/2)_0.04Ta₂O₈ ceramic demonstrated <em>ε</em>_<em>r</em> = 22.89, <em>Q×f</em> = 92,814 GHz, and <em>τ</em>_<em>f</em> = −34.33 ppm/°C. Similarly, the ZnZr_0.94(Al_1/2Nb_1/2)_0.06Ta₂O₈ ceramic achieved <em>ε</em>_<em>r</em> = 24.07, <em>Q×f</em> = 95,368 GHz, and <em>τ</em>_<em>f</em> = −9.98 ppm/°C at 1350 °C.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 24","pages":"Pages 43248-43255"},"PeriodicalIF":6.0,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149071648","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":"Non-destructive ultrasound phase spectroscopy study of the influence of Y2O3 and graphite addition on the cyclic thermal shock behavior of Al2O3-B4C composites","authors":"Mohammed Nazeer,&nbsp;Ajit Kumar Naik,&nbsp;Tapas Laha,&nbsp;Siddhartha Roy","doi":"10.1016/j.ceramint.2026.07.204","DOIUrl":"10.1016/j.ceramint.2026.07.204","url":null,"abstract":"<div><div>Al₂O₃-based ceramic cutting tools are promising for high-temperature machining because of their high hardness, chemical stability, and wear resistance. However, they exhibit poor thermal shock resistance, limiting their applications. Al₂O₃-B₄C composites hold promise as advanced cutting tools due to their outstanding mechanical properties, enabled by the addition of B₄C reinforcements. Additives such as Y₂O₃ and graphite (Gr) can further enhance the properties of Al₂O₃-B₄C composites, thereby improving performance. In the present study, ultrasound phase spectroscopy (UPS) was employed as a non-destructive evaluation technique to investigate the effects of Y₂O₃ and graphite additions on the cyclic thermal-shock behavior of spark plasma-sintered Al₂O₃-B₄C composites. Thermal shock tests were performed at effective temperature differences of Δ<em>T</em> = 500 °C and 800 °C, and the relative drop in the longitudinal elastic constant (C₁₁) after each quenching cycle was used as a quantitative measure of thermal shock resistance. Among all compositions, composites containing 30 vol% of fine B₄C particles and 5 vol% Y₂O₃ consistently showed the best cyclic thermal shock resistance. In composites without Y₂O₃ addition, a deleterious Al₁₈B₄O₃₃ phase formed during sintering, thereby affecting densification. The addition of Y₂O₃ suppressed the formation of this deleterious phase and, in addition, led to the formation of the Y₃Al₅O₁₂ phase as a transient liquid phase, which facilitated densification. Overall, the study establishes UPS as a sensitive and effective non-destructive method for tracking cyclic thermal shock damage in ceramic composites and demonstrates that Y₂O₃ addition is a powerful strategy for enhancing the thermal shock performance of Al₂O₃-B₄C composites.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 24","pages":"Pages 43147-43157"},"PeriodicalIF":6.0,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149071719","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 of Al2O3-ZrO2-La2O3 fibrous membrane and the effects on high-temperature stability","authors":"Lin Wang,&nbsp;Chenfei Gao,&nbsp;Yuhang Jiang,&nbsp;Zepeng Xu,&nbsp;Han Wei,&nbsp;Kangkang Yuan,&nbsp;Xiaotong Jin","doi":"10.1016/j.ceramint.2026.07.165","DOIUrl":"10.1016/j.ceramint.2026.07.165","url":null,"abstract":"<div><div>Structural evolution is essential for the fundamental understanding of high-temperature behavior and optimizing of ceramic micro/nanofibers. In the present work, the effects of structural evolution on the high temperature stability and flexibility of Al₂O₃-ZrO₂-La₂O₃ (AZLO) fibrous membranes were fully investigated. The evolution of precursor fiber pyrolysis, phase transformation and microstructure were characterized by TG/DSC, IR, XRD, SEM, ESB and HRTEM. From 800 to 1200°C, the dual-phasic structure of amorphous Al₂O₃ and fine ZrO₂ and La₂Zr₂O₇ grain contributed to the thermal stability and flexibility of AZLO fibrous membranes. At 1300°C, solid-state metathesis reaction between amorphous Al₂O₃ and intermediate phase La₂Zr₂O₇ led to the formation of fine LaAl₁₁O₁₈ and ZrO₂ grain. The interlaced distribution of fine ZrO₂ particles and platelet-like LaAl₁₁O₁₈ became the new fundament of thermal stability and flexibility of AZLO fibrous membranes. AZLO fibrous membranes could maintain its excellent high temperature stability and flexibility up to 1300°C and possessed a low room temperature thermal conductivity of 35.7 mW m⁻¹ K⁻¹. The present work provided a novel perspective for the rational design of Al₂O₃-ZrO₂ fibers from the view of structural evolution.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 24","pages":"Pages 42766-42774"},"PeriodicalIF":6.0,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149071888","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":"A laminated hybrid structure of bulk PZT and electrohydrodynamically printed thick films for miniature modal composite piezoelectric motors","authors":"Kuipeng Zhao,&nbsp;Fangshun Teng,&nbsp;Yuchi Liu,&nbsp;Zhenzhan Huang,&nbsp;Feng Wang,&nbsp;Yuanbiao Piao,&nbsp;Weidong Guo,&nbsp;Yunhao Cui,&nbsp;Dongming Li","doi":"10.1016/j.ceramint.2026.07.168","DOIUrl":"10.1016/j.ceramint.2026.07.168","url":null,"abstract":"<div><div>This study proposes a laminated hybrid excitation structure composed of bulk PZT piezoelectric ceramics and electrohydrodynamically printed PZT thick films for driving a miniature modal composite piezoelectric motor. By employing electrohydrodynamic printing to achieve continuous and precise micrometre-scale thickness compensation in high-strain regions, precise consistency regulation of the target resonant frequencies is realised while maintaining a high driving capability of the bulk PZT piezoelectric ceramics. With a total mass of only 0.13 g, the tiny motor exhibits a driving speed per unit mass and voltage that is ten times higher than that of piezoelectric motors of the same type. Scanning electron microscopy images of the surface and cross-section of the printed piezoelectric ceramic show that the PZT particles are uniformly distributed and the film surface is smooth, with good thickness uniformity and a printed thickness of 38 μm. X-ray diffraction patterns exhibit the characteristic diffraction peaks of a perovskite structure, indicating a favourable functional phase composition. The thick film exhibits a remanent polarization intensity (Pr) of 15.5 μC/cm², which is twice that of the PZT film fabricated by the spin-coating method. The motor prototype achieves a linear velocity of 12.13 mm/s, with a velocity per unit mass voltage of 2.67 mm/(V·g), an order of magnitude greater than comparable micro-motors. Finally, the miniature motor has been successfully applied to precision stepping drive of microlenses, enabling laser beam focusing adjustments from 3270 to 23,900 lx, validating that this hybrid laminated structure provides a new strategy for the miniaturisation of piezoelectric devices.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 24","pages":"Pages 42803-42812"},"PeriodicalIF":6.0,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149071891","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}