Ceramics International最新文献

{"title":"Dielectric, magnetic, and magnetodielectric change mechanisms in Y-type BaSrZn2Fe12O22 ceramics regulated by doping Al3+ and Ga3+ ions","authors":"Meng Sun ,&nbsp;Yang Yang ,&nbsp;Jian-Ping Zhou ,&nbsp;Qinghui Jiang ,&nbsp;Weijia Wang ,&nbsp;Xiao-ming Chen","doi":"10.1016/j.ceramint.2024.09.405","DOIUrl":"10.1016/j.ceramint.2024.09.405","url":null,"abstract":"<div><div>We systematically investigated the dielectric, magnetic, and magnetodielectric (MD) properties of Y-type hexaferrite doped with Al³⁺ and Ga³⁺ ions. Al³⁺ ions preferentially enter the spin-up octahedral lattice sites while Ga³⁺ ions occupy the spin-down octahedral lattice sites first and then, enter the spin- octahedral sites with the increase in doping amount. The initial magnetization reaches saturation from outside of the hysteresis loops, exhibiting a non-collinear spin order. The step-like increase in magnetization with magnetic field indicates the ferroelectric changes in longitudinal conical spin order. The positive MD effect at low temperatures and the negative MD effect after warming for the doped samples are controlled by non-collinear spin ordering and electron hopping, respectively. The Al-doped and Ga-doped samples exhibit different ferroelectric behaviors driven by magnetic fields. Their ferroelectric phase diagrams were proposed on the basis of magnetic and MD properties. The results associate the physical properties with the doped ions in Y-type hexaferrite.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 50595-50606"},"PeriodicalIF":5.1,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700442","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":"Salt-induced anisotropic SrTiO3 to boost piezo-photocatalytic processes","authors":"Yuying Jiang,&nbsp;Huijun Ma,&nbsp;Ke Yang,&nbsp;Guifang Zheng,&nbsp;Zhenhui Ma","doi":"10.1016/j.ceramint.2024.09.386","DOIUrl":"10.1016/j.ceramint.2024.09.386","url":null,"abstract":"<div><div>Piezo-photocatalysis materials that can combine the piezoelectric effect in photocatalytic processes are very attractive for promising applications in water splitting and contaminant degradation. The perovskite oxides with adjustable exposed crystal facets are expected to optimize the catalysis activities by exposing the high-energy planes. In this work, we develop a salt-assisted strategy that controllably prepares anisotropic SrTiO₃ particles with a large number of surface defects, which exhibit good piezo-photocatalytic features. The exposure of the crystal facets can be tuned by changing the assistants (NaCl or SrCl₂). The SrCl₂ can lead to the exposure of the (110) plane in one-dimensional SrTiO₃ particles and NaCl can induce the cubic SrTiO₃ particles with the exposure plane of (200). Attributed to the exposed high-energy facets and abundant oxygen vacancies, the latter show higher activities than the former in both water splitting and dye degradation under light irradiation and ultrasonic vibration. Our work provides an approach to optimize piezo-photocatalytic activities by tuning the exposed crystal facets.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 50410-50417"},"PeriodicalIF":5.1,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700444","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":"Microwave dielectric properties of novel Mg3Ga2TiO8 ceramic","authors":"Linzhao Ma,&nbsp;Qianbiao Du,&nbsp;Guo Tian,&nbsp;Hongzhi Xiao,&nbsp;Longxiang Jiang,&nbsp;Hao Li","doi":"10.1016/j.ceramint.2024.09.422","DOIUrl":"10.1016/j.ceramint.2024.09.422","url":null,"abstract":"<div><div>Mg₃Ga₂TiO₈ ceramics were prepared using a solid-phase method. The ceramics sintered at 1440 °C exhibited excellent microwave dielectric properties (<em>ε</em>_<em>r</em> = 12.07, <em>Q</em> × <em>f</em> = 89,270 GHz, and τ_<em>f</em> = −40.7 ppm/°C). The typical spinel structure of the Mg₃Ga₂TiO₈ ceramic was confirmed through Rietveld refinement and Raman spectroscopy. High-resolution transmission electron microscopy indicated local lattice distortion in the Mg₃Ga₂TiO₈ ceramics, with a Vickers hardness of 12.53 GPa. The values of <em>ε</em>_<em>r</em> and <em>Q</em> × <em>f</em> for the Mg₃Ga₂TiO₈ ceramics were affected by the relative density. The theoretical <em>ε</em>_<em>r</em> obtained from the C-M equation was lower than the measured <em>ε</em>_<em>r</em>, plausibly due to underestimation of the polarizability of the Ti ions. According to the P-V-L theory, Ti2-O1 has the highest <em>f</em>_<em>i</em> value, contributing 29.92 % to <em>ε</em>_<em>r</em>. The contribution rate of the Ga2-O1 bond to <em>U</em> was 35.76 %, with the greatest impact on <em>Q</em> × <em>f</em>.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 50774-50779"},"PeriodicalIF":5.1,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700311","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":"In situ boro-mullite phase formation in Glass–Ceramic glazes: Anatase–rutile phase transformations and microstructure properties","authors":"Fahriye Taşkıran ,&nbsp;Yasemen Kalpaklı","doi":"10.1016/j.ceramint.2024.09.411","DOIUrl":"10.1016/j.ceramint.2024.09.411","url":null,"abstract":"<div><div>‘‘Boro-mullite’’ is the name for mullites produced through the synthesis of boron-rich material and playing a critical role in producing high-performance materials. Also, the stability of the anatase phase in the glaze and against temperature has been addressed and improved by many studies. In situ boro-mullite crystals generated using various glass-ceramic glaze compositions that contain TiO₂ and their impact on the transformation of anatase into a rutile phase were examined in this study. Additionally, the samples' water absorption, bulk density, apparent porosity and shrinkage, Vickers hardness, and optical properties were evaluated at various Al₂O₃ and B₂O₃ amounts at 700 °C, 800 °C, 900 °C, 1000 °C and 1100 °C. X-ray diffraction analysis revealed that as the temperature and Al₂O₃ ratio rose, it triggered the boro-mullite phase formation. On the other hand, increasing the Al₂O₃ ratio led to a rise in the samples' sintering temperature and delayed the anatase to rutile phase transformation. Furthermore, the presence of corundum crystals retarded the anatase crystal size growth during the remodelling process of the conversion of anatase to rutile. While the increase in the B₂O₃ ratio sharpened the peaks of albite crystals, the formation of rutile crystals accelerated with the increase in temperature and caused inhibition of albite formation. The albite phase's presence facilitated the creation of the liquid phase and achieved the 0.010 % water absorption and 0 % apparent porosity values as well the highest bulk density and microhardness with 2.476 g/cm3 and 550 H V. The yellowness (+b∗) values were found to be the highest at 1100 °C where the rutile crystals reached their maximum size. The anatase-rutile conversion is postponed and the increase in the yellowness value is prevented by the glaze's formation of boro-mullite. FESEM-EDS analysis showed that the temperature was the driving force in the transformation of acicular boro-mullite crystal into highly acicular prismatic needle crystal and spherical anatase crystals into the rod shape rutile.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 50667-50679"},"PeriodicalIF":5.1,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700430","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":"Mechanical properties and structural evolution of sodium borosilicate glasses during uniaxial tension: Molecular dynamics simulation and experiments","authors":"Zeyu Kang ,&nbsp;Pengfei Xu ,&nbsp;lulu Zhang ,&nbsp;Ziang Liu ,&nbsp;Yan Liu ,&nbsp;Wenkai Gao ,&nbsp;Yi Cao ,&nbsp;Yunlong Yue ,&nbsp;Junfeng Kang","doi":"10.1016/j.ceramint.2024.09.413","DOIUrl":"10.1016/j.ceramint.2024.09.413","url":null,"abstract":"<div><div>The mechanical properties and structural evolution of sodium borosilicate glasses under the uniaxial tensile process were investigated through molecular dynamics simulation. The simulated properties of sodium borosilicate glasses were in good agreement with the experimental values. [BO₃] and Na⁺ compensated [BO₄] groups were generated in the glass network in low boron content, while [BO₃] appeared with increasing boron oxide. The structure descriptor, F_net synthesized the structure and energy information of the glass network which was positively correlated with Young's modulus. The strength has been diminished due to the decreased degree of polymerization of the glass network and the migration of Na⁺ cations. Simultaneously, the elastic deformation of sodium borosilicate glass arose from the motion of Na⁺ cations and alterations in the Si-O-Si bond angle. Moreover, the plastic deformation of sodium borosilicate glasses was attributed to the transition from [BO₄] to [BO₃] and the higher mobility of [BO₃] than [BO₄] and [SiO₄].</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 50690-50696"},"PeriodicalIF":5.1,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700432","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 novel synthesis of porous Ba2Co2Mn1.2Fe10.8O22/carbon composites for high efficiency electromagnetic wave absorption","authors":"Yongkang Lai ,&nbsp;Feng Tian ,&nbsp;Yu Gao ,&nbsp;Chen Li ,&nbsp;Qikui Man ,&nbsp;Baogen Shen","doi":"10.1016/j.ceramint.2024.09.393","DOIUrl":"10.1016/j.ceramint.2024.09.393","url":null,"abstract":"<div><div>Designing an electromagnetic wave (EMW) absorbing material with ultra-wide effective absorption bandwidth (EAB) and low filling ratio is the key to solving the problem of electromagnetic pollution. In this study, the porous Ba₂Co₂Mn_1.2Fe_10.8O₂₂/C (Mn-Co₂Y/C) composites were prepared by radial freeze-drying method as well as high temperature carbonization process (400 °C, 500 °C, 600 °C, and 700 °C). The research results indicate that the sample annealed at 600 °C exhibits superior EMW absorption properties, achieving the widest EAB of 5.77 GHz at a thickness of 1.7 mm, which is attributed to the synergistic effect of multiple reflections of EMWs within microchannels of the samples and the interfacial polarization between Mn-Co₂Y ferrite and C material. Samples prepared at 600 °C have the best impedance matching, which makes it easier for EMWs to enter the material, thus exhibiting better EMW absorption performance. The magnetic loss mainly originates from natural resonance at low frequencies and eddy current loss at high frequencies, and the dielectric loss stems from relaxation loss and conductivity loss.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 50484-50495"},"PeriodicalIF":5.1,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700325","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":"Hardness and compressive properties of negative thermal expansion ceramic ZrMgMo3O12 reinforced 2024Al composites","authors":"Junrui Yang ,&nbsp;Chaofan Yin ,&nbsp;Binbin Dong ,&nbsp;Jianjun Chen ,&nbsp;Wei Luo ,&nbsp;Ming Liu ,&nbsp;Jiahui Tang ,&nbsp;Xinhe Yang ,&nbsp;Guopeng Zhang ,&nbsp;Zhongxia Liu","doi":"10.1016/j.ceramint.2024.09.395","DOIUrl":"10.1016/j.ceramint.2024.09.395","url":null,"abstract":"<div><div>This work investigated the Vickers hardness and compressive properties of 0–30 % ZrMgMo₃O_12p/2024Al composites with controlled thermal expansion. The composites exhibited superior Vickers hardness and compressive properties, highly dependent on the ZrMgMo₃O₁₂ content. Under identical preparation conditions, an increase in ZrMgMo₃O₁₂ content allows for adjusting the Vickers hardness from 163 to 280 HV and the compressive yield strength from 330 to 702 MPa. Additionally, the 5 % and 10 % ZrMgMo₃O₁₂ composites exhibited 23 % and 8 % compressive strains, respectively. The Orowan strengthening effect of the ZrMgMo₃O₁₂ particles and the thermal mismatch stress at the particle-matrix interface were identified as the key strengthening mechanisms for the composites. However, excessive stress can lead to interfacial debonding and composite failure. Agglomeration of the ZrMgMo₃O₁₂ particles was observed beyond 10 % content. At 30 %, the thermal mismatch stress exceeded the binding strength, causing interfacial debonding and composite failure. The controlled mechanical properties of the 0–30 % ZrMgMo₃O_12p/2024Al composites indicate a promising potential for application in the aerospace and automotive industries and electronics and optical instruments sectors.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 50496-50503"},"PeriodicalIF":5.1,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700326","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":"Garnet-structure phosphors with ultra-high color purity red emission for potential warm WLED and flexible-transparent displays","authors":"Yongbin Hua ,&nbsp;Wen-Xing Yang ,&nbsp;Weiguang Ran","doi":"10.1016/j.ceramint.2024.09.397","DOIUrl":"10.1016/j.ceramint.2024.09.397","url":null,"abstract":"<div><div>Red-emitting phosphors play a pivotal role in the field of lighting technologies. This study introduces an innovative class of Li₆SrEu₂Sb₂O₁₂ garnet-structured phosphors, distinguished by the resistance to concentration quenching. A comprehensive examination of the crystal structure, electronic configuration, and photoluminescence characteristics has been conducted. Notably, the doping Eu³⁺ ions and their doping concentrations barely affected the crystal structure and morphology, and the band gap slightly decreased as the doping concentration increased. Interestingly, the obtained samples exhibit an ultra-high color purity, good thermal stability (78.60 % at 423 K), and suitable internal photoluminescence quantum yield (44.18 %). Consequently, a phosphor-converted white LED has been successfully fabricated, which boasts an outstanding correlated color temperature of 3271 K. Beyond conventional application, this research also introduces the concept of innovative flexible-transparent displays harnessing the phosphor film. Overall, this work has synthesized a groundbreaking red-emitting phosphor, poised to enhance traditional lighting sources and potentially pave the way for new applications in the field of advanced optical displays.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 50516-50525"},"PeriodicalIF":5.1,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700328","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":"The effect of solid content on the anisotropy for 3D printed barium titanate piezoelectric ceramics","authors":"Zihua Cheng ,&nbsp;Liuli Chen ,&nbsp;Yuhang Liao,&nbsp;Maodan Yuan,&nbsp;Lvming Zeng,&nbsp;Fei Zuo,&nbsp;Yan Chen,&nbsp;Xuanrong Ji","doi":"10.1016/j.ceramint.2024.09.414","DOIUrl":"10.1016/j.ceramint.2024.09.414","url":null,"abstract":"<div><div>3D printing technique can be used to fabricating complex-structure ceramics, but the internal microstructure and properties along vertical and horizontal directions may show certain anisotropy due to the layer-by-layer process. This work aims to evaluate 3D printing anisotropy quantitatively for performance optimization via the stereolithography method. The square-shaped barium titanate (BTO) ceramics with three different solid contents (75 %, 80 % and 85 %) were prepared to characterize the differences between the vertical and horizontal directions of the ceramics, including microstructure, phase structure, electrical properties and mechanical properties. The electrical and mechanical performances of the printed BTO ceramics in vertical direction are superior to that of horizontal direction, and the differences firstly decrease with the solid contents increasing to 80 % and then increase slightly with further solid content increasing. Besides, the printed BTO ceramic with 80 wt% solid content has excellent electrical performance. This study may provide a potential way for achieving high performance and low anisotropy in the vertical and horizontal of printed ceramics.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 50697-50703"},"PeriodicalIF":5.1,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700433","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":"Fabrication of carbon fiber reinforced SiC composites based on laser directed energy deposition","authors":"Chuang Yang,&nbsp;Tiantian Wang,&nbsp;Fan Jiao,&nbsp;Wei Li,&nbsp;Longxue Lv,&nbsp;Xiaohong Shi,&nbsp;Hejun Li","doi":"10.1016/j.ceramint.2024.09.416","DOIUrl":"10.1016/j.ceramint.2024.09.416","url":null,"abstract":"<div><div>Carbon fiber reinforced silicon carbide ceramic matrix composites (CF/SiC) are widely applied in aerospace and other industries fields for its extraordinary properties. Nevertheless, traditional preparation processes encounter the challenges of long cyclicality, high economic cost due to the increasing requests. Consequently, this work integrates the CF/SiC composites with the novel laser directed energy deposition (L-DED) printing technology, which is differing from conventional 3D printing technology for it omits the post-processing procedure. CF/SiC composites are designed and manufactured efficiently, and the effects of carbon fiber addition are analyzed. Mechanical properties are utilized to characterize the internal bonding strength and the results reveal that the maximum flexural and compressive reach 119.33 ± 4.04 MPa and 396.20 ± 10.21 MPa, respectively, attributed to the enhanced crack propagation resistance caused by the carbon fiber addition. At the same time, this paper not only characterizes the performance through objective experimental data, but also expounds the formation mechanism of pores and cracks through material analysis. In conclusion, this work pioneers the application of L-DED molding technology to CF/SiC composites fabrication and validated its preparation capability, which not only improves the efficiency but also opens up a new path for CF/SiC composites preparation in the field of 3D printing.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 50713-50725"},"PeriodicalIF":5.1,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700435","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}