Pub Date : 2024-09-23DOI: 10.1016/j.ceramint.2024.09.261
Mengfei Yan , Jitao Cao , Shaopeng He , Shijun Liu , Gang Zhou , Changgui Lin , Shixun Dai , Peiqing Zhang
Infrared microlens arrays (IR MLAs) are crucial for infrared imaging, target detection, and night vision, but creating high-quality large-scale IR MLAs is costly and challenging. This study presents a precision molding method to produce 500 × 500 microlenses on chalcogenide glass. The method involves creating concave silica molds with femtosecond laser-assisted chemical etching, which are then used to press convex MLAs onto the chalcogenide glass surface. By using single-pulse direct writing technology, a microlens array template containing 500 × 500 microlenses can be completed within 25 min. Meanwhile, the chemical etching method offers a highly efficient and low-cost way to prepare mold. The resulting MLAs exhibited smooth surfaces, uniform structures, and good imaging and focusing capabilities, indicating the effectiveness of this approach for large-scale MLA patterning and batch production.
{"title":"Efficient fabrication of large-scale chalcogenide glass microlens arrays via precision molding method","authors":"Mengfei Yan , Jitao Cao , Shaopeng He , Shijun Liu , Gang Zhou , Changgui Lin , Shixun Dai , Peiqing Zhang","doi":"10.1016/j.ceramint.2024.09.261","DOIUrl":"10.1016/j.ceramint.2024.09.261","url":null,"abstract":"<div><div>Infrared microlens arrays (IR MLAs) are crucial for infrared imaging, target detection, and night vision, but creating high-quality large-scale IR MLAs is costly and challenging. This study presents a precision molding method to produce 500 × 500 microlenses on chalcogenide glass. The method involves creating concave silica molds with femtosecond laser-assisted chemical etching, which are then used to press convex MLAs onto the chalcogenide glass surface. By using single-pulse direct writing technology, a microlens array template containing 500 × 500 microlenses can be completed within 25 min. Meanwhile, the chemical etching method offers a highly efficient and low-cost way to prepare mold. The resulting MLAs exhibited smooth surfaces, uniform structures, and good imaging and focusing capabilities, indicating the effectiveness of this approach for large-scale MLA patterning and batch production.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49194-49199"},"PeriodicalIF":5.1,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664355","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}
Pub Date : 2024-09-23DOI: 10.1016/j.ceramint.2024.09.297
Yu Lei Liu , Jian Yong Huang , Liang Bin Li , Chang Feng Liu , Hai Chao Qi , Jing Bin Hou , Chao Li , Heng Li , Yan Feng
It is a good choice to mix hollow SiO2 nanoparticles with organic resins to prepare mechanically robust and flexible anti-reflective coating. In this paper, hollow SiO2 nanoparticles with adjustable size, good dispersion and homogeneity were prepared by polyacrylic acid template, in which the size of the hollow silica nanoparticles can be adjusted between 60 and 370 nm. Hollow SiO2 nanoparticles were compounded with UV-cured silsesquioxanes sol to prepare four sets of composite coatings with refractive indices of 1.11, 1.20, 1.27 and 1.36. Each of these coatings can result in a significant reduction in the reflectance of the PET substrate and can result in the lowest reflectance of the PET substrate to 1.63 %, 1.26 %, 0.96 % and 1.45 %, respectively. Among them, the coating with the lowest reflectance result can reduce the average reflectivity of the PET substrate in the 400–1000 nm band from 5.92 % to 2.02 %. In addition, the organic resins can connect the hollow SiO2 nanoparticles together to improve the mechanically robust of the coating. The results of the pencil hardness tester showed that the mechanical properties of the composite coating were significantly improved. The composite anti-reflective coating with hollow SiO2 nanoparticles and organic resin not only has excellent anti-reflective performance in flexible substrate materials, but also has great application prospects in photovoltaic glass, architectural glass and other fields.
{"title":"Mechanically robust and flexible antireflection coatings from UV-cured organic-inorganic composites","authors":"Yu Lei Liu , Jian Yong Huang , Liang Bin Li , Chang Feng Liu , Hai Chao Qi , Jing Bin Hou , Chao Li , Heng Li , Yan Feng","doi":"10.1016/j.ceramint.2024.09.297","DOIUrl":"10.1016/j.ceramint.2024.09.297","url":null,"abstract":"<div><div>It is a good choice to mix hollow SiO<sub>2</sub> nanoparticles with organic resins to prepare mechanically robust and flexible anti-reflective coating. In this paper, hollow SiO<sub>2</sub> nanoparticles with adjustable size, good dispersion and homogeneity were prepared by polyacrylic acid template, in which the size of the hollow silica nanoparticles can be adjusted between 60 and 370 nm. Hollow SiO<sub>2</sub> nanoparticles were compounded with UV-cured silsesquioxanes sol to prepare four sets of composite coatings with refractive indices of 1.11, 1.20, 1.27 and 1.36. Each of these coatings can result in a significant reduction in the reflectance of the PET substrate and can result in the lowest reflectance of the PET substrate to 1.63 %, 1.26 %, 0.96 % and 1.45 %, respectively. Among them, the coating with the lowest reflectance result can reduce the average reflectivity of the PET substrate in the 400–1000 nm band from 5.92 % to 2.02 %. In addition, the organic resins can connect the hollow SiO<sub>2</sub> nanoparticles together to improve the mechanically robust of the coating. The results of the pencil hardness tester showed that the mechanical properties of the composite coating were significantly improved. The composite anti-reflective coating with hollow SiO<sub>2</sub> nanoparticles and organic resin not only has excellent anti-reflective performance in flexible substrate materials, but also has great application prospects in photovoltaic glass, architectural glass and other fields.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49520-49528"},"PeriodicalIF":5.1,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664155","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}
SiCf/SiC composites provide a possibility to achieve the structure-function integration of military stealth materials used for aircraft tail. However, how to overcome narrow-band electromagnetic wave (EMW) absorption remains challenging. Herein, based on the adjustable permittivity of SiC fibers and the flexible design of woven structures, a gradient-structured SiCf/SiC hybrid woven metamaterial (GHWMM) is engineered with three different permittivity SiC fibers. The absorbing properties and mechanisms of the GHWMM were studied by combining experiment and simulation. Benefiting from the synergistic effect of strong dielectric loss, structural loss, and impedance matching, the GHWMM harvests an average reflection loss (RL) of −12 dB (93.7 % absorptivity), with an effective absorption bandwidth (EAB, RL ≤ −10 dB) of up to 10.7 GHz in the 4–18 GHz. Surprisingly, at high temperature of 1000 °C, the GHWMM still exhibits a RL below −5 dB in most frequency bands. Moreover, the GHWMM displays excellent wide-angle incidence characteristics, while possessing a remarkable flexural strength of 226.4 MPa. This work lays a foundation for the renewal of textile structures and the preparation of large-size assemblies, which holds promising prospect for application in the field of aircraft hot end components.
{"title":"Gradient-structured SiCf/SiC hybrid woven metamaterials with superior broadband absorption and high-load bearing","authors":"Majuan Zhao, Jianhua Zheng, Xiaoxu Wang, Jiajing Zhang, Diantang Zhang","doi":"10.1016/j.ceramint.2024.09.284","DOIUrl":"10.1016/j.ceramint.2024.09.284","url":null,"abstract":"<div><div>SiC<sub>f</sub>/SiC composites provide a possibility to achieve the structure-function integration of military stealth materials used for aircraft tail. However, how to overcome narrow-band electromagnetic wave (EMW) absorption remains challenging. Herein, based on the adjustable permittivity of SiC fibers and the flexible design of woven structures, a gradient-structured SiC<sub>f</sub>/SiC hybrid woven metamaterial (GHWMM) is engineered with three different permittivity SiC fibers. The absorbing properties and mechanisms of the GHWMM were studied by combining experiment and simulation. Benefiting from the synergistic effect of strong dielectric loss, structural loss, and impedance matching, the GHWMM harvests an average reflection loss (RL) of −12 dB (93.7 % absorptivity), with an effective absorption bandwidth (EAB, RL ≤ −10 dB) of up to 10.7 GHz in the 4–18 GHz. Surprisingly, at high temperature of 1000 °C, the GHWMM still exhibits a RL below −5 dB in most frequency bands. Moreover, the GHWMM displays excellent wide-angle incidence characteristics, while possessing a remarkable flexural strength of 226.4 MPa. This work lays a foundation for the renewal of textile structures and the preparation of large-size assemblies, which holds promising prospect for application in the field of aircraft hot end components.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49400-49411"},"PeriodicalIF":5.1,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664264","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}
Pub Date : 2024-09-23DOI: 10.1016/j.ceramint.2024.09.294
Yasi Chen , Shaohao Quan , Sirui Huang , Wenhui Liu , Zhenyi Chen , Jinhao Liu , Changwei Li , Hui Yang
The objective of bone tissue engineering is to develop materials and techniques that can repair large segmental bone defects by locally adding bioactive materials in precise configurations. This field has advanced significantly since the introduction of scaffold materials, requiring breakthroughs in materials science, biomechanics, biomedical engineering, and regenerative medicine. 3D printing technology, due to its precision and customization capabilities, has gained prominence in creating personalized scaffolds that enhance bone healing and modulate immune responses. The review delves into the mechanisms of bone injury healing, highlighting the crucial role of the immune system and macrophage polarization in the healing process. It covers various 3D printing techniques, including extrusion-based 3D printing (EP), fused deposition modeling (FDM), and light curing 3d printing, discussing their suitability for fabricating complex scaffold structures. The materials discussed include calcium phosphate ceramics, silicate ceramics, and ceramic/polymer and ceramic/metal composites. Key factors influencing the immune regulatory functions of these scaffolds, such as surface nano-structures, pore size and porosity, surface charge, and the release of metal ions, are examined. Despite significant advancements, challenges remain in clinical applications, including issues with raw materials, high-temperature shrinkage, printing precision, structural stability, and immune regulation. Future research directions involve improving material selection, optimizing scaffold design, and leveraging advanced 3D printing technologies to enhance the biocompatibility, bioactivity, and mechanical properties of bioceramic scaffolds. This review provides a comprehensive understanding of current progress and future prospects in the field of 3D printed bioceramic scaffolds for bone tissue repair and immune regulation.
骨组织工程学的目标是开发材料和技术，通过在局部添加生物活性材料，以精确的配置修复大块骨缺损。自支架材料问世以来，这一领域取得了长足的进步，需要在材料科学、生物力学、生物医学工程和再生医学方面取得突破。三维打印技术因其精确性和定制能力，在创建可促进骨愈合和调节免疫反应的个性化支架方面取得了突出成就。这篇综述深入探讨了骨损伤愈合的机制，强调了免疫系统和巨噬细胞极化在愈合过程中的关键作用。它涵盖了各种三维打印技术，包括基于挤压的三维打印（EP）、熔融沉积建模（FDM）和光固化三维打印，讨论了它们在制造复杂支架结构方面的适用性。讨论的材料包括磷酸钙陶瓷、硅酸盐陶瓷以及陶瓷/聚合物和陶瓷/金属复合材料。研究还探讨了影响这些支架免疫调节功能的关键因素，如表面纳米结构、孔径和孔隙率、表面电荷以及金属离子的释放。尽管取得了重大进展，但临床应用仍面临挑战，包括原材料、高温收缩、印刷精度、结构稳定性和免疫调节等问题。未来的研究方向包括改进材料选择、优化支架设计以及利用先进的三维打印技术来提高生物陶瓷支架的生物相容性、生物活性和机械性能。本综述全面介绍了用于骨组织修复和免疫调节的 3D 打印生物陶瓷支架领域的当前进展和未来前景。
{"title":"Applications and progress of 3D printed bioceramic scaffolds in bone tissue repair and immune regulation","authors":"Yasi Chen , Shaohao Quan , Sirui Huang , Wenhui Liu , Zhenyi Chen , Jinhao Liu , Changwei Li , Hui Yang","doi":"10.1016/j.ceramint.2024.09.294","DOIUrl":"10.1016/j.ceramint.2024.09.294","url":null,"abstract":"<div><div>The objective of bone tissue engineering is to develop materials and techniques that can repair large segmental bone defects by locally adding bioactive materials in precise configurations. This field has advanced significantly since the introduction of scaffold materials, requiring breakthroughs in materials science, biomechanics, biomedical engineering, and regenerative medicine. 3D printing technology, due to its precision and customization capabilities, has gained prominence in creating personalized scaffolds that enhance bone healing and modulate immune responses. The review delves into the mechanisms of bone injury healing, highlighting the crucial role of the immune system and macrophage polarization in the healing process. It covers various 3D printing techniques, including extrusion-based 3D printing (EP), fused deposition modeling (FDM), and light curing 3d printing, discussing their suitability for fabricating complex scaffold structures. The materials discussed include calcium phosphate ceramics, silicate ceramics, and ceramic/polymer and ceramic/metal composites. Key factors influencing the immune regulatory functions of these scaffolds, such as surface nano-structures, pore size and porosity, surface charge, and the release of metal ions, are examined. Despite significant advancements, challenges remain in clinical applications, including issues with raw materials, high-temperature shrinkage, printing precision, structural stability, and immune regulation. Future research directions involve improving material selection, optimizing scaffold design, and leveraging advanced 3D printing technologies to enhance the biocompatibility, bioactivity, and mechanical properties of bioceramic scaffolds. This review provides a comprehensive understanding of current progress and future prospects in the field of 3D printed bioceramic scaffolds for bone tissue repair and immune regulation.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 48891-48908"},"PeriodicalIF":5.1,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664295","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}
Pub Date : 2024-09-23DOI: 10.1016/j.ceramint.2024.09.302
Chaofan Yin , Junrui Yang , Jianjun Chen , Li Wang , Binbin Dong , Keke Zhang , Kai Peng , Xiangcheng Li
Graphite-based composite materials have emerged as a crucial alternative to traditional flake graphite for optimizing the performance of Al2O3-SiC-C (ASC) castables after decarburization. In this paper, high wetting SiC@C composites powder was prepared via a sol-gel method combined with a carbothermal reduction reaction, and its effect on the oxidation behavior of ASC castables is explored. The results showed that SiC@C composites was synthesized under microwave conditions at 1000 °C, forming a structure where SiC whiskers are coated. And its contact angle with water decreases from 107° to 35°. Upon incorporation into ASC castables, the SiC whiskers within the sample continued to grow and develop with increasing addition of graphite-based composite materials. At a 2 wt% addition, the SiC whiskers began to form a cylindrical structure. Simultaneously, both the cold crushing strength and cold modulus of rupture exhibited a gradual increase. At the optimal 2 wt% addition, these values reached their maximum, 79.5 MPa and 11.4 MPa, respectively. The substitution of graphite-based composite materials also conferred good oxidation resistance to the ASC samples. Under oxidizing atmosphere conditions, the SiC whiskers on the composite material's surface facilitated the formation of a SiO2 coating layer, which impeded the contact between oxygen and graphite, thereby enhancing the oxidation resistance of the material. Consequently, the oxidation index was reduced from 75.58 % to 42.71 %.
{"title":"Oxidation behavior of Al2O3-SiC-C castable with highly wettable SiC@C composites","authors":"Chaofan Yin , Junrui Yang , Jianjun Chen , Li Wang , Binbin Dong , Keke Zhang , Kai Peng , Xiangcheng Li","doi":"10.1016/j.ceramint.2024.09.302","DOIUrl":"10.1016/j.ceramint.2024.09.302","url":null,"abstract":"<div><div>Graphite-based composite materials have emerged as a crucial alternative to traditional flake graphite for optimizing the performance of Al<sub>2</sub>O<sub>3</sub>-SiC-C (ASC) castables after decarburization. In this paper, high wetting SiC@C composites powder was prepared via a sol-gel method combined with a carbothermal reduction reaction, and its effect on the oxidation behavior of ASC castables is explored. The results showed that SiC@C composites was synthesized under microwave conditions at 1000 °C, forming a structure where SiC whiskers are coated. And its contact angle with water decreases from 107° to 35°. Upon incorporation into ASC castables, the SiC whiskers within the sample continued to grow and develop with increasing addition of graphite-based composite materials. At a 2 wt% addition, the SiC whiskers began to form a cylindrical structure. Simultaneously, both the cold crushing strength and cold modulus of rupture exhibited a gradual increase. At the optimal 2 wt% addition, these values reached their maximum, 79.5 MPa and 11.4 MPa, respectively. The substitution of graphite-based composite materials also conferred good oxidation resistance to the ASC samples. Under oxidizing atmosphere conditions, the SiC whiskers on the composite material's surface facilitated the formation of a SiO<sub>2</sub> coating layer, which impeded the contact between oxygen and graphite, thereby enhancing the oxidation resistance of the material. Consequently, the oxidation index was reduced from 75.58 % to 42.71 %.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49568-49576"},"PeriodicalIF":5.1,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664120","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}
Pub Date : 2024-09-22DOI: 10.1016/j.ceramint.2024.09.293
Rui Zhang , Huiming Zhang , Fuyan Liu , Miao Sun , Shuai Ma
The oxidation behavior and oxidation mechanism of Ti3SiC2/Cu composites were investigated using constant temperature oxidation method. The Ti3SiC2/Cu composites were prepared at different sintering temperatures. Results showed that the relationship between the oxidation reaction rate of Ti3SiC2/Cu composites in air at 700 °C–900 °C and the oxidation temperature was in accordance with the parabolic law of oxidation kinetics. The oxidation weight gain and oxide layer thickness of Ti3SiC2/Cu composites at 700 °C and 800 °C were insignificant, with oxidation reaction rates of 3.0692 × 10−9 kg2m−4h−1 and 6.9856 × 10−9 kg2m−4h−1, respectively, and the oxidation rate of Ti3SiC2/Cu composites at 900 °C was enhanced to 1.00907 × 10−8 kg2m−4h−1. Ti3SiC2/Cu composites oxidized at 900 °C formed a protective oxide layer, which was mainly a multilayer structure composed of different kinds of oxides: the outer layer was mainly composed of TiO2; the intermediate layer mainly consisted of CuO; the inner layer mainly made up of TiO2 and SiO2.
{"title":"High temperature oxidation resistance behavior of Ti3SiC2/Cu composites under migration of Ti and Cu atomic","authors":"Rui Zhang , Huiming Zhang , Fuyan Liu , Miao Sun , Shuai Ma","doi":"10.1016/j.ceramint.2024.09.293","DOIUrl":"10.1016/j.ceramint.2024.09.293","url":null,"abstract":"<div><div>The oxidation behavior and oxidation mechanism of Ti<sub>3</sub>SiC<sub>2</sub>/Cu composites were investigated using constant temperature oxidation method. The Ti<sub>3</sub>SiC<sub>2</sub>/Cu composites were prepared at different sintering temperatures. Results showed that the relationship between the oxidation reaction rate of Ti<sub>3</sub>SiC<sub>2</sub>/Cu composites in air at 700 °C–900 °C and the oxidation temperature was in accordance with the parabolic law of oxidation kinetics. The oxidation weight gain and oxide layer thickness of Ti<sub>3</sub>SiC<sub>2</sub>/Cu composites at 700 °C and 800 °C were insignificant, with oxidation reaction rates of 3.0692 × 10<sup>−9</sup> kg<sup>2</sup>m<sup>−4</sup>h<sup>−1</sup> and 6.9856 × 10<sup>−9</sup> kg<sup>2</sup>m<sup>−4</sup>h<sup>−1</sup>, respectively, and the oxidation rate of Ti<sub>3</sub>SiC<sub>2</sub>/Cu composites at 900 °C was enhanced to 1.00907 × 10<sup>−8</sup> kg<sup>2</sup>m<sup>−4</sup>h<sup>−1</sup>. Ti<sub>3</sub>SiC<sub>2</sub>/Cu composites oxidized at 900 °C formed a protective oxide layer, which was mainly a multilayer structure composed of different kinds of oxides: the outer layer was mainly composed of TiO<sub>2</sub>; the intermediate layer mainly consisted of CuO; the inner layer mainly made up of TiO<sub>2</sub> and SiO<sub>2</sub>.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49490-49500"},"PeriodicalIF":5.1,"publicationDate":"2024-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664109","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}
Pub Date : 2024-09-22DOI: 10.1016/j.ceramint.2024.09.289
Lin-Chao Yang , Quan Zhou , Jin-Qiu Liu , Zhuo Wang , Yue-Chan Song , Wen-Wen Wu , Peng Liu
Extensive studies on TiO2-based colossal permittivity (CP, dielectric constant ε’ >103) materials have focused on the cation doping of metal elements; however, little attention has been paid to nonmetallic dopants. Compared to metallic elements, nonmetallic atoms with small radii and high activities, such as H, C, B, and N, can be used as anion-doping elements. Their incorporation into the TiO2 lattice includes interstitial and substitutional doping, which can influence the bandgap of TiO2 and its electron transport performance differently, thereby exhibiting considerable potential in TiO2-based applications. In this study, different N-containing compounds (BN and NH4Cl) were doped into rutile TiO2, while homogeneous ceramics of single-phase rutile TiO2 were prepared via solid-state sintering. The effects of co-doping N, Cl, and N, B on the dielectric properties of rutile TiO2 ceramics were investigated. While N and Cl doping showed no considerable effect on the dielectric properties of rutile TiO2 ceramics, the co-doping of N and B doping in rutile TiO2 considerably increased the dielectric constant to >104 with suppressed tan δ in a wide frequency range from 1 kHz to 10 MHz. These ceramics exhibited excellent frequency stability (up to 100 MHz) and temperature stability (153–513 K), which outperforms most reported transition metal co-doped TiO2 ceramics, thereby highlighting the untapped potential of the non-metallic dopants in enhancing dielectric materials.
对基于二氧化钛的巨大介电常数（CP，介电常数ε'>103）材料的广泛研究主要集中在金属元素的阳离子掺杂上，但对非金属掺杂物的关注却很少。与金属元素相比，H、C、B 和 N 等具有小半径和高活性的非金属原子可用作阴离子掺杂元素。它们在二氧化钛晶格中的掺杂包括间隙掺杂和取代掺杂，可对二氧化钛的带隙及其电子传输性能产生不同的影响，从而在基于二氧化钛的应用中展现出巨大的潜力。本研究在金红石 TiO2 中掺入了不同的含氮化合物（BN 和 NH4Cl），并通过固态烧结制备了单相金红石 TiO2 均质陶瓷。研究了共掺杂 N、Cl 和 N、B 对金红石 TiO2 陶瓷介电性能的影响。虽然 N 和 Cl 的掺杂对金红石 TiO2 陶瓷的介电性能没有显著影响，但在 1 kHz 至 10 MHz 的宽频范围内，金红石 TiO2 中 N 和 B 的共掺杂大大提高了介电常数至 104，并抑制了 tan δ。这些陶瓷表现出卓越的频率稳定性（高达 100 MHz）和温度稳定性（153-513 K），优于大多数已报道的过渡金属共掺杂 TiO2 陶瓷，从而凸显了非金属掺杂物在增强介电材料方面尚未开发的潜力。
{"title":"Dielectric properties of (N, B) and (N, Cl) co-doped rutile TiO2 ceramics","authors":"Lin-Chao Yang , Quan Zhou , Jin-Qiu Liu , Zhuo Wang , Yue-Chan Song , Wen-Wen Wu , Peng Liu","doi":"10.1016/j.ceramint.2024.09.289","DOIUrl":"10.1016/j.ceramint.2024.09.289","url":null,"abstract":"<div><div>Extensive studies on TiO<sub>2</sub>-based colossal permittivity (CP, dielectric constant ε’ >10<sup>3</sup>) materials have focused on the cation doping of metal elements; however, little attention has been paid to nonmetallic dopants. Compared to metallic elements, nonmetallic atoms with small radii and high activities, such as H, C, B, and N, can be used as anion-doping elements. Their incorporation into the TiO<sub>2</sub> lattice includes interstitial and substitutional doping, which can influence the bandgap of TiO<sub>2</sub> and its electron transport performance differently, thereby exhibiting considerable potential in TiO<sub>2</sub>-based applications. In this study, different N-containing compounds (BN and NH<sub>4</sub>Cl) were doped into rutile TiO<sub>2</sub>, while homogeneous ceramics of single-phase rutile TiO<sub>2</sub> were prepared via solid-state sintering. The effects of co-doping N, Cl, and N, B on the dielectric properties of rutile TiO<sub>2</sub> ceramics were investigated. While N and Cl doping showed no considerable effect on the dielectric properties of rutile TiO<sub>2</sub> ceramics, the co-doping of N and B doping in rutile TiO<sub>2</sub> considerably increased the dielectric constant to >10<sup>4</sup> with suppressed tan δ in a wide frequency range from 1 kHz to 10 MHz. These ceramics exhibited excellent frequency stability (up to 100 MHz) and temperature stability (153–513 K), which outperforms most reported transition metal co-doped TiO<sub>2</sub> ceramics, thereby highlighting the untapped potential of the non-metallic dopants in enhancing dielectric materials.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49450-49458"},"PeriodicalIF":5.1,"publicationDate":"2024-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664105","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}
In this study, Bi0.9Er0.1FeO3/In2O3 composites were prepared by sol-gel method. The structure, morphology, elemental valence and ethanol gas sensing performance were characterized and studied. At 330 °C, Bi0.9Er0.1FeO3/In2O3 composite sensor exhibits a response of 112 when exposed to 100 ppm ethanol, roughly 7 times higher than Bi0.9Er0.1FeO3. The response/recovery time of the sensor is 5 s/75 s, alongside good selectivity, anti-interference and stability. The improved performance in gas sensing may be ascribed to heterojunctions between Bi0.9Er0.1FeO3 nanoparticles and In2O3 nanoparticles. Meanwhile, Bi0.9Er0.1FeO3/In2O3 composites have larger specific surface area, which increases adsorption sites and supports reactions more effectively.
{"title":"Highly sensitive ethanol gas sensors based on Bi0.9Er0.1FeO3/In2O3 composites","authors":"Xiaolian Liu, Xiaolin You, Zhipeng Sun, Guohua Cao, Junjun Wang, Lanlan Guo, Guodong Wang","doi":"10.1016/j.ceramint.2024.09.291","DOIUrl":"10.1016/j.ceramint.2024.09.291","url":null,"abstract":"<div><div>In this study, Bi<sub>0.9</sub>Er<sub>0.1</sub>FeO<sub>3</sub>/In<sub>2</sub>O<sub>3</sub> composites were prepared by sol-gel method. The structure, morphology, elemental valence and ethanol gas sensing performance were characterized and studied. At 330 °C, Bi<sub>0.9</sub>Er<sub>0.1</sub>FeO<sub>3</sub>/In<sub>2</sub>O<sub>3</sub> composite sensor exhibits a response of 112 when exposed to 100 ppm ethanol, roughly 7 times higher than Bi<sub>0.9</sub>Er<sub>0.1</sub>FeO<sub>3</sub>. The response/recovery time of the sensor is 5 s/75 s, alongside good selectivity, anti-interference and stability. The improved performance in gas sensing may be ascribed to heterojunctions between Bi<sub>0.9</sub>Er<sub>0.1</sub>FeO<sub>3</sub> nanoparticles and In<sub>2</sub>O<sub>3</sub> nanoparticles. Meanwhile, Bi<sub>0.9</sub>Er<sub>0.1</sub>FeO<sub>3</sub>/In<sub>2</sub>O<sub>3</sub> composites have larger specific surface area, which increases adsorption sites and supports reactions more effectively.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49470-49479"},"PeriodicalIF":5.1,"publicationDate":"2024-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664107","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}
Pub Date : 2024-09-22DOI: 10.1016/j.ceramint.2024.09.295
Guanghui Liu , Xiaosong Zhang , Chao Li , Xinru Wang , Baozeng Zhou , Enze Jin , Jianping Xu , Lan Li
Mid-infrared (MIR) light sources have gained significant importance across various applications in spectroscopy, sensing, astronomy, communications and medical surgery. The diverse spectral characteristics of rare earth ions, particularly lanthanide ions, stemming from their distinctive 4f intershell transitions, offer a multitude of potential transitions spanning the UV–visible–infrared spectrum. Despite recent advancements in MIR gain luminescence, the investigation of tunable MIR luminescence mechanisms remains a major technical challenge. Herein, an effective mechanism to modulate the local crystal field of rare earth ions by altering its crystal structure has been revealed, resulting in tunable broad-spectrum emission in the MIR luminescence range of 2800–3000 nm and multi-peak emission in the near-infrared band of Ho3+. Notably, the local crystal field of Ho3+ is adjusted by manipulating the lattice symmetry of CsPb1-xHoxBr3 perovskite through the incorporation of fluoride glass reticulation to control the crystal size of the perovskite and thereby modify the lattice symmetry of CsPb1-xHoxBr3 perovskite. The energy level transition of Ho3+ is influenced by adjusting the crystal field asymmetry, resulting in the splitting of the 5I6 energy level depending on the crystal field. This cleavage affects the transitions from the 5I5 level to 5I6 at 1480 nm and from 5I6 to 5I7 at 2880 nm. As 5I6 acts as the common upper level for the two emission peaks, the infrared peaks at 1480 nm and 2880 nm widen and develop into a dual-peak emission phenomenon. The infrared luminescence produced aligns closely with the distinctive infrared absorption peaks of carbon dioxide, leading to the development of a convenient, high-precision device for monitoring of CO2 concentration in hydrogen energy in real time. These findings are anticipated to pave the way for extensive utilization of novel tunable MIR luminescence.
{"title":"Highly efficient tunable mid-infrared luminescence achieved by crystal field modulation of CsPb1-xHoxBr3 halide perovskite AlF3-based fluoride glass","authors":"Guanghui Liu , Xiaosong Zhang , Chao Li , Xinru Wang , Baozeng Zhou , Enze Jin , Jianping Xu , Lan Li","doi":"10.1016/j.ceramint.2024.09.295","DOIUrl":"10.1016/j.ceramint.2024.09.295","url":null,"abstract":"<div><div>Mid-infrared (MIR) light sources have gained significant importance across various applications in spectroscopy, sensing, astronomy, communications and medical surgery. The diverse spectral characteristics of rare earth ions, particularly lanthanide ions, stemming from their distinctive 4f intershell transitions, offer a multitude of potential transitions spanning the UV–visible–infrared spectrum. Despite recent advancements in MIR gain luminescence, the investigation of tunable MIR luminescence mechanisms remains a major technical challenge. Herein, an effective mechanism to modulate the local crystal field of rare earth ions by altering its crystal structure has been revealed, resulting in tunable broad-spectrum emission in the MIR luminescence range of 2800–3000 nm and multi-peak emission in the near-infrared band of Ho<sup>3+</sup>. Notably, the local crystal field of Ho<sup>3+</sup> is adjusted by manipulating the lattice symmetry of CsPb<sub>1-x</sub>Ho<sub>x</sub>Br<sub>3</sub> perovskite through the incorporation of fluoride glass reticulation to control the crystal size of the perovskite and thereby modify the lattice symmetry of CsPb<sub>1-x</sub>Ho<sub>x</sub>Br<sub>3</sub> perovskite. The energy level transition of Ho<sup>3+</sup> is influenced by adjusting the crystal field asymmetry, resulting in the splitting of the <sup>5</sup>I<sub>6</sub> energy level depending on the crystal field. This cleavage affects the transitions from the <sup>5</sup>I<sub>5</sub> level to <sup>5</sup>I<sub>6</sub> at 1480 nm and from <sup>5</sup>I<sub>6</sub> to <sup>5</sup>I<sub>7</sub> at 2880 nm. As <sup>5</sup>I<sub>6</sub> acts as the common upper level for the two emission peaks, the infrared peaks at 1480 nm and 2880 nm widen and develop into a dual-peak emission phenomenon. The infrared luminescence produced aligns closely with the distinctive infrared absorption peaks of carbon dioxide, leading to the development of a convenient, high-precision device for monitoring of CO<sub>2</sub> concentration in hydrogen energy in real time. These findings are anticipated to pave the way for extensive utilization of novel tunable MIR luminescence.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49501-49513"},"PeriodicalIF":5.1,"publicationDate":"2024-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664111","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}
Two structural designs are based on the arapaima fish scale structure to enhance the performance of composites. A double-layer SiC/PyC coating was deposited to modify C/C-HfC-SiC composites by chemical vapor deposition. The introduction of PyC coating reduced the porosity and roughness of composites. Ar-O2-Al2O3 plasma ablation system was used to assess the composites. The composites with arapaima fish scale structure showed good flexural and ultra-temperature particle erosion resistance. The samples with the introduction of PyC layer showed higher flexural strength of 220 MPa, which is 40.13 % higher than that of without. After ablation 40 s, the linear ablation rates decreased from 5.95 μm/s to −4.6 μm/s. This study provides new ideas to develop C/C composites with improved ablation-resistant and mechanical properties.
{"title":"Ablation resistance and mechanical properties of C/C-HfC-SiC composites with a bulletproof-like layer","authors":"Zhiqiang Liu, Yujun Jia, Shubo Zhang, Jian Zhang, Jingtong Li, Luncheng Tang, Jiaping Zhang, Qiangang Fu","doi":"10.1016/j.ceramint.2024.09.292","DOIUrl":"10.1016/j.ceramint.2024.09.292","url":null,"abstract":"<div><div>Two structural designs are based on the arapaima fish scale structure to enhance the performance of composites. A double-layer SiC/PyC coating was deposited to modify C/C-HfC-SiC composites by chemical vapor deposition. The introduction of PyC coating reduced the porosity and roughness of composites. Ar-O<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> plasma ablation system was used to assess the composites. The composites with arapaima fish scale structure showed good flexural and ultra-temperature particle erosion resistance. The samples with the introduction of PyC layer showed higher flexural strength of 220 MPa, which is 40.13 % higher than that of without. After ablation 40 s, the linear ablation rates decreased from 5.95 μm/s to −4.6 μm/s. This study provides new ideas to develop C/C composites with improved ablation-resistant and mechanical properties.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49480-49489"},"PeriodicalIF":5.1,"publicationDate":"2024-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664108","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}
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