IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-24 DOI: 10.1016/j.vacuum.2025.114368

Yu Wu , Ling Dong , Zhengyang Qiao , Hongchuan Jiang , Xiaohui Zhao , Yang Li , Jiawei Tian

{"title":"Lattice structure evolution mechanism of carbon and hydrogen co-doped AlN thin films with temperature","authors":"Yu Wu , Ling Dong , Zhengyang Qiao , Hongchuan Jiang , Xiaohui Zhao , Yang Li , Jiawei Tian","doi":"10.1016/j.vacuum.2025.114368","DOIUrl":"10.1016/j.vacuum.2025.114368","url":null,"abstract":"<div><div>Carbon and hydrogen co-doped AlN thin films (AlN&C-H) are deposited on quartz glass with different N<sub>2</sub>/CH<sub>4</sub> gas flow ratios. The influence of N<sub>2</sub>/CH<sub>4</sub> ratio on the lattice structure of AlN&C-H samples is studied. X-ray diffraction peak of AlN&C-H samples shifts to the left obviously, which illustrates that C and H co-doping lead to lattice expansion of AlN thin films. XPS results indicate the interstitial C-H and the substitutional C-H on the lattice sites of Al. High-resolution TEM images exhibit that carbon and hydrogen co-doping causes mass dislocations. High-temperature annealing is used to repair the defects of AlN&C-H samples. The lattice structure evolution law of AlN&C-H samples with temperature is clarified. X-ray diffraction angle (2<em>θ</em>) is carried out to indicate the lattice structure repair degree. In the temperature range of 700∼1100 °C, the 2<em>θ</em> value increases linearly with temperature. The linear variation relation of 2<em>θ</em> with temperature can be used as a criterion for temperature measurement.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114368"},"PeriodicalIF":3.8,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143878468","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}

引用次数: 0

Hierarchical TaO2F microspheres assembled by nanosheets and their application in infrared and microwave transparency and lithium-ion batteries 纳米片组装的层次化陶2f微球及其在红外、微波透明和锂离子电池中的应用

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-24 DOI: 10.1016/j.vacuum.2025.114367

Tong Liu , Xin Geng , Yanpeng Mu , Chenglin Fan , Shifeng Huang

{"title":"Hierarchical TaO2F microspheres assembled by nanosheets and their application in infrared and microwave transparency and lithium-ion batteries","authors":"Tong Liu , Xin Geng , Yanpeng Mu , Chenglin Fan , Shifeng Huang","doi":"10.1016/j.vacuum.2025.114367","DOIUrl":"10.1016/j.vacuum.2025.114367","url":null,"abstract":"<div><div>Transition metal oxyfluorides possess enormous promise as high-performance anodes for energy storage and transparent materials for modern communication systems. In this study, a series of hierarchical TaO<sub>2</sub>F microspheres composed of single crystalline nanosheets, were synthesized via a straightforward hydrothermal method at 160 °C for 6–48 h. The growth of TaO<sub>2</sub>F nanosheets is governed through hydrolysis-condensation reactions of tantalum ions, enhanced by the use of acetic acid, which leads to the formation of well-defined, hierarchical microsphere structures through aggregation and self-assembly. These TaO<sub>2</sub>F microspheres exhibit high infrared and microwave transparency, with transmittance exceeding 90 % within the 2–18 GHz frequency range at a thickness of 1.5 mm, attributable to their low imaginary permittivity, low dielectric loss tangent and well-formed crystalline structure. As anodes for LIBs, TaO<sub>2</sub>F microspheres demonstrate good lithium storage properties including a high reversible capacity, notable high-rate capability (107 mA h g<sup>−1</sup> at 1250 mA g<sup>−1</sup>), and robust cyclic stability. This performance results from a synergistic effect of a large surface area (75 m<sup>2</sup> g<sup>−1</sup>), sub-50 nm particle size, and porous structure, which contribute to efficient Li ion transport and lower bandgap energy.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114367"},"PeriodicalIF":3.8,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070423","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}

引用次数: 0

Optical properties of β-tricalcium phosphate and hydroxyapatite for droplet-free hydroxyapatite coating by pulsed-laser deposition 脉冲激光沉积无液滴羟基磷灰石涂层中β-磷酸三钙和羟基磷灰石的光学性质

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-23 DOI: 10.1016/j.vacuum.2025.114331

Hidehiko Yashiro , Hiroshi Takashima , Hideki Ohmura , Masayuki Kakehata , Daisuke Kawagoe

{"title":"Optical properties of β-tricalcium phosphate and hydroxyapatite for droplet-free hydroxyapatite coating by pulsed-laser deposition","authors":"Hidehiko Yashiro , Hiroshi Takashima , Hideki Ohmura , Masayuki Kakehata , Daisuke Kawagoe","doi":"10.1016/j.vacuum.2025.114331","DOIUrl":"10.1016/j.vacuum.2025.114331","url":null,"abstract":"<div><div>Droplet deposition by pulsed-laser ablation is one of the most serious drawbacks to pulsed-laser deposition coatings, especially for the deposition of high-flatness hydroxyapatite coatings onto biomaterial implants. The eclipse-type scheme for geometric droplet elimination enables the deposition of an ideal flat hydroxyapatite coating layer onto zirconia substrates, where the coating layer is completely changed to crystalline hydroxyapatite <em>via</em> a low-temperature <em>in situ</em> annealing process. However, this scheme decreases the deposition rate drastically. If droplet ejection is suppressed by the selection of an appropriate ablation laser, the deposition rate increases and the laser irradiation configuration becomes simple. To elucidate the relation between the photon energy of the ablation laser and the optical properties of hydroxyapatite and β-TCP used as targets, the particles ablated from these targets using the 4th harmonic of a Nd:YAG laser and an ArF excimer laser were characterized. An ArF excimer laser, which has a higher photon energy than the bandgap energy of the dielectric targets, was found to suppress droplet deposition.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114331"},"PeriodicalIF":3.8,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144147617","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}

引用次数: 0

Numerical and experimental investigation of magnetic fluid sealing under high-speed conditions 高速条件下磁力流体密封的数值与实验研究

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-23 DOI: 10.1016/j.vacuum.2025.114366

Yajing Qiao , Decai Li , Yao Ge , Sijia Liu , Xiancai Li

{"title":"Numerical and experimental investigation of magnetic fluid sealing under high-speed conditions","authors":"Yajing Qiao , Decai Li , Yao Ge , Sijia Liu , Xiancai Li","doi":"10.1016/j.vacuum.2025.114366","DOIUrl":"10.1016/j.vacuum.2025.114366","url":null,"abstract":"<div><div>To address the issue of traditional magnetic fluid sealing failing under high-speed conditions, which makes them unsuitable for vacuum sealing applications, a high-speed-resistant magnetic fluid sealing structure was designed and compared with the conventional magnetic fluid sealing structure. The magnetization and rheological properties of two ester-based magnetic fluids were investigated to assess their suitability for high-speed magnetic fluid sealing. The effects of single and dual magnetic sources, pole teeth position, and rotational shaft speed on the sealing performance were compared, providing valuable insights for the design of high-speed-resistant magnetic fluid sealing. A high-speed-resistant magnetic fluid sealing was designed, manufactured, and tested, demonstrating long-term stable operation under high-speed conditions with a 45 mm diameter rotational shaft at 30,000 rpm (surface linear velocity of 70.65 m/s). The results of this study are of significant importance for the design of magnetic fluid sealing capable of meeting the demands of high-speed operating conditions.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114366"},"PeriodicalIF":3.8,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887051","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}

引用次数: 0

Precipitation behavior of the secondary L12-Al3(Sc, Zr) phase in the SLM fabricated Al-4Cu-2Mg-0.3Sc-0.7Zr alloy during aging process 时效过程中Al-4Cu-2Mg-0.3Sc-0.7Zr合金中次生L12-Al3（Sc, Zr）相的析出行为

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-23 DOI: 10.1016/j.vacuum.2025.114365

Haolan Zhang , Zhongwei Chen , Weijiang Song , Yijun Wu , Bo An

{"title":"Precipitation behavior of the secondary L12-Al3(Sc, Zr) phase in the SLM fabricated Al-4Cu-2Mg-0.3Sc-0.7Zr alloy during aging process","authors":"Haolan Zhang , Zhongwei Chen , Weijiang Song , Yijun Wu , Bo An","doi":"10.1016/j.vacuum.2025.114365","DOIUrl":"10.1016/j.vacuum.2025.114365","url":null,"abstract":"<div><div>The precipitation behavior of the secondary L1<sub>2</sub>-Al<sub>3</sub>(Sc, Zr) precipitates in the selective laser melting (SLM) fabricated Al-4Cu-2Mg-0.3Sc-0.7Zr alloy is investigated. And the distribution of Sc and Zr atoms in the secondary Al<sub>3</sub>(Sc, Zr) precipitates at different aging temperatures was studied by HAADF-STEM. The secondary L1<sub>2</sub>-Al<sub>3</sub>(Sc, Zr) precipitates are predominantly comprise Al and Sc atoms after direct aging at 225 °C for 2.5 h, and this indicating that Sc elements primarily control the nucleation and the growth of the L1<sub>2</sub>-Al<sub>3</sub>(Sc, Zr) phase at 225 °C. The distinct Al<sub>3</sub>Sc-rich core and Al<sub>3</sub>Zr-rich shell structure were observed when the aging temperature increases to 440 °C, and both Sc atoms and Zr atoms actively participate in the nucleation and growth of Al<sub>3</sub>(Sc, Zr) particles at 440 °C. Furthermore, Cu element enriched at the interface between Al<sub>3</sub>(Sc, Zr) precipitate and Al matrix following direct aging treatment at 440 °C for 0.5 h. And during non-isothermal aging process, the oxidation was observed occurs at the grain boundary mainly when the aging temperatures were higher than 440 °C.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114365"},"PeriodicalIF":3.8,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874022","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}

引用次数: 0

Simulation of yttria hot cathode and radiative emissivity impact on its performances and the work function measurement 钇热阴极模拟及辐射发射率对其性能和功函数测量的影响

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-23 DOI: 10.1016/j.vacuum.2025.114363

Audrey Mayrat , Quentin Rafhay , Claire Verrier , Jean-Luc Deschanvres

引用次数: 0

Effect of oxidation time on the composition and structure evolution of the oxide film on Al-Mg-Sc-Zr alloy 氧化时间对Al-Mg-Sc-Zr合金氧化膜组成及组织演化的影响

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-23 DOI: 10.1016/j.vacuum.2025.114359

Mingjin Wu

{"title":"Effect of oxidation time on the composition and structure evolution of the oxide film on Al-Mg-Sc-Zr alloy","authors":"Mingjin Wu","doi":"10.1016/j.vacuum.2025.114359","DOIUrl":"10.1016/j.vacuum.2025.114359","url":null,"abstract":"<div><div>The oxidation behavior of Al-Mg-Sc-Zr alloy at 300 °C for different oxidation times was systematically studied, the influence of oxidation time on the composition of the oxide scale and the microstructure of the substrate was revealed, and the relationship between oxidation time, microstructure of substrate and oxide scale composition and structure was established. The results showed that with the increase of oxidation time, the morphology of the oxide scale changed from irregular and thin film to a loose structure oxide scale with MgO particle aggregates, and finally formed a thick and dense oxide scale. Initially, Al<sub>2</sub>O<sub>3</sub> dominated the oxide scale composition, but with increasing oxidation time, the MgO content gradually increased. At 1.5h, the MgO content in the oxide scale exceeded that of Al<sub>2</sub>O<sub>3</sub>, eventually becoming the predominant component. And at 2.0 h, the composition of the oxide scale changed to MgO, MgAl<sub>2</sub>O<sub>4</sub>, and a few Al<sub>2</sub>O<sub>3</sub>, and MgAl<sub>2</sub>O<sub>4</sub> was present largely in the deep part of the oxide scale, gradually replacing MgO in the thickness direction as the oxidation time prolonged. At the same time, the orientation of the matrix grains changed, and the proportion of HAGBs increased dramatically, which increased the diffusion rate of Mg atoms. As the oxidation time increased, changes in dislocation density and precipitation of nanoparticles also affected the path and speed of atomic migration, thereby determining the phase composition and structural stability of the oxide scale on Al-Mg-Sc-Zr alloy.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114359"},"PeriodicalIF":3.8,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868310","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}

引用次数: 0

Thermal activation of co-evaporated Ti, Zr and V-based binary and ternary getter alloy thin films: characterization by electrical measurements during hydrogenation 共蒸发Ti， Zr和v基二、三元吸气剂合金薄膜的热活化：加氢过程中的电测量表征

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-22 DOI: 10.1016/j.vacuum.2025.114354

Sylvain Lemettre , Charlotte Kutyla , Clément Bessouet , Laetitia Leroy , Alain Bosseboeuf , Thierry Sauvage , Olivier Wendling , Aurélien Bellamy , Stéphanie Escoubas , Christophe Guichet , Olivier Thomas , Johan Moulin

{"title":"Thermal activation of co-evaporated Ti, Zr and V-based binary and ternary getter alloy thin films: characterization by electrical measurements during hydrogenation","authors":"Sylvain Lemettre , Charlotte Kutyla , Clément Bessouet , Laetitia Leroy , Alain Bosseboeuf , Thierry Sauvage , Olivier Wendling , Aurélien Bellamy , Stéphanie Escoubas , Christophe Guichet , Olivier Thomas , Johan Moulin","doi":"10.1016/j.vacuum.2025.114354","DOIUrl":"10.1016/j.vacuum.2025.114354","url":null,"abstract":"<div><div>Ti, Zr, V, Zr-Ti, Zr-V, Ti-V and Ti-Zr-V alloy thin films were co-evaporated under UHV. Their composition was characterized by Rutherford Backscattering Spectrometry while their microstructure was characterized directly by X-ray diffraction and scanning electronic microscopy, and indirectly by electrical measurements. Depending on their composition, films are polycrystalline or amorphous and have a resistivity ranging from 60 to 160 μΩ cm. Amorphous films exhibit resistivities higher than 150 μΩ cm and negative TCRs, in accordance with Mooij rule. No bulk oxidation in ambient air was detected by electrical measurements over a period as long as 2 years. After deposition, films were activated during a thermal annealing at 5 °C/min up to 400 °C under 10<sup>−7</sup> mbar vacuum or 10<sup>−3</sup> mbar of H<sub>2</sub>. An in situ sheet resistance monitoring of the films during annealing allowed to detect their hydrogenation and thus to compare their activation temperatures. Films with amorphous microstructure (ZrV, TiZrV) have lower activation temperatures than single element films and nanocrystalline ZrTi and TiV films. TiZrV has the lowest activation temperature, while single metal films have the highest activation temperatures.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114354"},"PeriodicalIF":3.8,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143873894","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}

引用次数: 0

Efficient carrier transfer in the van der Waals straddling heterostructure 范德华跨层异质结构中的高效载流子传输

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-22 DOI: 10.1016/j.vacuum.2025.114364

Xiangna Cong , Muhammad Najeeb Ullah Shah , Wenlong He

引用次数: 0

Achieving excellent properties of Cu-2wt%Ag wire by annealing treatment and large deformation 通过退火处理和大变形，获得Cu-2wt%Ag丝的优异性能

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-22 DOI: 10.1016/j.vacuum.2025.114362

Lin Qi , Xin Wang , Wenbin Tian , Jia Cai , Yuping Ren , Hongxiao Li , Min Jiang , Gaowu Qin

引用次数: 0

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