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Amorphous SiCxNy:H thin films produced with various nitrogen sources: A comparative study 不同氮源制备非晶SiCxNy:H薄膜的比较研究
IF 3.9 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-01-22 DOI: 10.1016/j.vacuum.2026.115106
E. Ermakova , A. Plehanov , A. Saraev , E. Gerasimov , V. Shayapov , E. Maksimovskiy , V. Sulyaeva , A. Kolodin , M. Kosinova
Hydrogenated silicon carbonitride (SiCxNy:H) films have received much attention for applications in microelectronics, particularly as interlayer dielectrics and copper diffusion barriers. However, the demonstrated properties are crucially dependent on the elemental composition and chemical bonding structure. Thus, precise control over the type of precursors and deposition conditions is necessary for the development of efficient experimental procedure. In this study, SiCxNy:H films were deposited at 200–450 °C by plasma-enhanced chemical vapor deposition (PECVD) using hexamethyldisilane (HMDS, Me3Si–SiMe3) in mixtures with nitrogen or ammonia, as well as hexamethyldisilazane (HMDSN, Me3Si–NH–SiMe3) with helium. The motivation is to establish a fundamental correlation between the plasma chemistry, driven by different nitrogen sources (N2, NH3, or the amine group in HMDSN), and film properties. Under low-power conditions the three distinct series of non-porous materials, characterized as Si–C-type and two Si–N-type, were obtained. Refractive index and dielectric constant changed in the range of 1.62–1.99 and 3.8–5.4, respectively, were related to the deposition conditions and chemical composition of the films. Transmittance electron microscopy (TEM) investigation showed the films are suitable as diffusion barriers for Cu/low-k damascene integration.
氢化碳氮化硅(SiCxNy:H)薄膜在微电子领域的应用备受关注,特别是作为层间介质和铜扩散屏障。然而,所证明的性能关键取决于元素组成和化学键结构。因此,对前驱体类型和沉积条件的精确控制对于开发有效的实验程序是必要的。在本研究中,采用等离子体增强化学气相沉积(PECVD)方法,在200-450℃下用六亚甲基二硅烷(HMDS, Me3Si-SiMe3)与氮气或氨气混合,以及六亚甲基二硅烷(HMDSN, Me3Si-NH-SiMe3)与氦气混合沉积SiCxNy:H薄膜。目的是在不同氮源(N2、NH3或HMDSN中的胺基)驱动下,建立等离子体化学与薄膜性质之间的基本相关性。在低功率条件下,得到了si - c型和两个si - n型三种不同系列的无孔材料。折射率和介电常数的变化范围分别为1.62 ~ 1.99和3.8 ~ 5.4,与薄膜的沉积条件和化学成分有关。透射电镜(TEM)研究表明,该薄膜适合作为Cu/低k damascene集成的扩散屏障。
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引用次数: 0
Erosion of cathode materials with different melting points in a pulsed vacuum arc 脉冲真空电弧中不同熔点阴极材料的腐蚀
IF 3.9 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-01-22 DOI: 10.1016/j.vacuum.2026.115132
G. Yu Yushkov, V.D. Gridilev, A.G. Nikolaev, E.M. Oks
We present the results of our experiments of specific erosion of 13 different cathode materials in a microsecond pulsed vacuum arc with current 200 A. The specific erosion of materials with relatively high melting points, greater than Тmelt = 650 °C for magnesium, was found to lie within the range from 30 to 100 μg/C, which is typical of erosion in vacuum arc cathode spots. For materials with low melting points, below Тmelt = 328 °C for lead, anomalously high specific erosion in the range from 500 to 1000 μg/C was observed. We find that this high erosion is due to the contribution of a microdroplet component to the erosion products from vacuum arc cathode spots, when the cathode surface melts to the depth of tens of micrometers during the arc pulse and splashing of the melt due to electro explosive processes in the cathode spots.
本文介绍了13种不同阴极材料在200 a微秒脉冲真空电弧中比蚀的实验结果。熔点较高的材料(镁的熔点大于Тmelt = 650℃)的比蚀在30 ~ 100 μg/C范围内,是典型的真空电弧阴极点蚀。对于熔点较低的材料,铅在Тmelt = 328℃以下,在500 ~ 1000 μg/C范围内观察到异常高的比侵蚀。我们发现,这种高侵蚀是由于微液滴成分对真空电弧阴极点侵蚀产物的贡献,当阴极表面在电弧脉冲期间熔化到几十微米的深度时,阴极点上的电爆炸过程导致熔体飞溅。
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引用次数: 0
Editorial Board and Vacuum units 编辑委员会和真空单位
IF 3.9 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-01-22 DOI: 10.1016/S0042-207X(26)00050-3
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引用次数: 0
Engineering anisotropic room-temperature exchange bias in D019-Mn3Ga/CoFeB bilayer grown on Al2O3 substrates via Ru seed layer-induced interface modulation Ru种子层诱导界面调制在Al2O3衬底上生长的D019-Mn3Ga/CoFeB双分子层的工程各向异性室温交换偏置
IF 3.9 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-01-22 DOI: 10.1016/j.vacuum.2026.115127
Wei-Chih Chang
Room-temperature exchange bias (EB) in Mn-based noncollinear antiferromagnets has drawn increasing attention for spintronic applications. However, in D019-Mn3Ga/CoFeB system, the EB effect is usually restricted to low temperatures. Here, we demonstrate that introducing a Ru seed layer enables a tunable and anisotropic EB at room temperature. Interfacial strain induced by the Ru layer modulates the lattice symmetry and reconfigures the Dzyaloshinskii-Moriya interaction (DMI). These strain-mediated modifications promote the formation of nanoscale ferromagnetic (FM) clusters driven by the reconfiguration of magnetic octupole symmetry and the displacement of Weyl nodes in momentum space, which act as topological interfacial pinning centers. This selectively enhances the in-plane (IP) EB field to 35.68 Oe while reducing the out-of-plane (OOP) component. The anisotropic EB can be independently controlled by adjusting the Mn3Ga thickness: the IP EB decreases with increasing thickness due to lattice relaxation, whereas the OOP EB increases, revealing distinct interfacial and bulk topological contributions related to the stabilization of the relaxed magnetic octupole state. The observed waist-shaped hysteresis loops indicate an asynchronous reversal mechanism governed by a graded pinning landscape originating from the interplay between lattice-induced DMI and Weyl node dynamics. These results establish that both the Ru seed layer and Mn3Ga thickness are effective tuning parameters for engineering room-temperature anisotropic EB effect, providing a promising route toward noncollinear antiferromagnetic MRAM and orientation-dependent spintronic devices.
mn基非共线反铁磁体的室温交换偏置(EB)在自旋电子领域的应用越来越受到关注。然而,在D019-Mn3Ga/CoFeB体系中,EB效应通常局限于低温。在这里,我们证明了引入Ru种子层可以在室温下实现可调谐和各向异性的EB。钌层引起的界面应变调节了晶格对称性,重新配置了Dzyaloshinskii-Moriya相互作用(DMI)。这些应变介导的修饰通过磁八极对称的重新配置和动量空间中Weyl节点的位移来促进纳米铁磁(FM)簇的形成,Weyl节点作为拓扑界面钉钉中心。这选择性地将面内(IP) EB场增强到35.68 Oe,同时减少了面外(OOP)分量。各向异性EB可以通过调节Mn3Ga厚度来独立控制:由于晶格弛豫,IP EB随着厚度的增加而降低,而OOP EB则随着厚度的增加而增加,显示出与松弛磁八极子态稳定相关的明显的界面和体拓扑贡献。观察到的腰形迟滞环表明,由晶格诱导的DMI和Weyl节点动力学之间的相互作用引起的渐变钉钉景观控制的异步反转机制。这些结果表明,Ru种子层和Mn3Ga厚度都是工程室温各向异性EB效应的有效调谐参数,为非共线反铁磁MRAM和取向相关自旋电子器件提供了一条有希望的途径。
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引用次数: 0
CMOS-compatible MBE-grown germanium quantum dots for high-performance photodetectors and solar cells 用于高性能光电探测器和太阳能电池的cmos兼容mbe生长锗量子点
IF 3.9 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-01-21 DOI: 10.1016/j.vacuum.2026.115124
S. Ghalab , Mansour Aouassa , A.K. Aladim , Saud A. Algarni , Majed Alharbi , Mohammed Ibrahim , K.M.A. Saron , Mohammed Bouabdellaoui , Isabelle Berbezier
In this work, we grow and investigate CMOS-compatible Ge quantum dots (Ge QDs) integrated into metal–oxide–semiconductor (MOS) photodetectors, with a focus on their electrical transport and photocurrent response. Crystalline Ge QDs with an average diameter of ≈5.8 nm, hemispherical shape, and a high density (∼5 × 1012 cm−2) are formed by solid-state dewetting of a 1 nm amorphous Ge film grown by molecular beam epitaxy (MBE) on SiO2/Si, subsequently capped with a 45 nm SiO2 layer, and finally converted into MOS Ge-QD photodetectors by depositing transparent AuPd pads. Temperature-dependent current–voltage and capacitance–voltage measurements, complemented by photocurrent analysis, reveal the formation of a Schottky-like MOS photodetector exhibiting a rectification ratio close to 102 and a low dark current. Charge transport is governed by thermionic emission assisted by Fowler–Nordheim tunneling, with the embedded Ge QDs acting as efficient charge-relay centers in the oxide, facilitating carrier injection and reducing the threshold voltage without degrading the capacitive behavior of the structure. Under illumination, the Ge-QD–based MOS photodetectors show a pronounced enhancement of photosensitivity, particularly in the visible spectral range, consistent with strong quantum confinement in the QDs. These results demonstrate that MBE-grown Ge QDs obtained by solid-state dewetting provide a promising platform for the realization of CMOS-compatible, low-power, high-performance optoelectronic devices, especially photodetectors and, more broadly, quantum-dot–engineered solar-cell architectures.
在这项工作中,我们生长和研究了集成到金属氧化物半导体(MOS)光电探测器中的cmos兼容的Ge量子点(Ge QDs),重点研究了它们的电输运和光电流响应。通过分子束外延(MBE)在SiO2/Si上生长1 nm非晶态Ge薄膜,然后加盖45 nm SiO2层,最后通过沉积透明的AuPd衬垫转化为MOS Ge- qd光电探测器,形成平均直径≈5.8 nm、半球形、高密度(~ 5 × 1012 cm−2)的Ge量子点晶体。温度相关的电流电压和电容电压测量,加上光电流分析,揭示了肖特基式MOS光电探测器的形成,其整流比接近102,暗电流低。电荷输运由Fowler-Nordheim隧道效应辅助的热离子发射控制,嵌入的Ge量子点在氧化物中充当有效的电荷中继中心,促进载流子注入并降低阈值电压,而不会降低结构的电容性。在光照下,基于锗量子点的MOS光电探测器表现出明显的光敏性增强,特别是在可见光谱范围内,这与量子点中的强量子约束一致。这些结果表明,通过固态脱湿获得的mbe生长的Ge量子点为实现cmos兼容,低功耗,高性能光电器件,特别是光电探测器以及更广泛的量子点工程太阳能电池架构提供了一个有前途的平台。
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引用次数: 0
Enhancement of interfacial structure and mechanical properties of Zr-3 alloy and 304L stainless steel diffusion bonded joint via Ti interlayer introduction 引入Ti中间层增强Zr-3合金与304L不锈钢扩散焊接头界面结构和力学性能
IF 3.9 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-01-21 DOI: 10.1016/j.vacuum.2026.115129
Zhuofu Wei , Xiwen Hu , Shiyu Niu , Yuxin Wang , Zhongliang Liu , Zhenwen Yang , Ying Wang
To obtain the high-strength joint of zirconium alloy and stainless steel for nuclear applications, this study utilized a Ti interlayer for diffusion bonding of Zr-3 alloy and 304L stainless steel. Direct diffusion bonding resulted in the formation of numerous brittle intermetallic compounds, including Zr2(Fe, Ni) and Zr(Fe, Cr)2. The introduction of the Ti interlayer eliminated these phases, and the typical interfacial reaction layer of the joints was Zr-3/(Ti, Zr)/Ti/NiTi/TiFe/TiCr2/(Fe, Cr)/304L. The diffusion layer at the Ti/304L interface was identified as the key factor governing the joint's mechanical properties. Within this layer, TiFe and NiTi phases formed preferentially, followed by TiCr2 and (Fe, Cr) phases. Higher bonding temperatures and longer holding times significantly promoted the interdiffusion of Ti with Fe and Cr from the 304L steel. This enrichment of brittle TiFe and TiCr2 phases at the interface consequently degraded the joint properties. The joint achieved a peak shear strength of 247 MPa under the parameters of 760 °C/60 min/10 MPa, representing a 115 % increase compared to the direct diffusion-bonded joint. The fracture was primarily initiated in the brittle phases, such as TiFe and TiCr2, within the Ti/304L diffusion layer.
为了获得核用锆合金与不锈钢的高强度接头,本研究采用Ti中间层对Zr-3合金与304L不锈钢进行扩散连接。直接扩散键合形成了许多脆性金属间化合物,包括Zr2(Fe, Ni)和Zr(Fe, Cr)2。Ti中间层的引入消除了这些相,接头的典型界面反应层为Zr-3/(Ti, Zr)/Ti/NiTi/TiFe/TiCr2/(Fe, Cr)/304L。Ti/304L界面处的扩散层是控制接头力学性能的关键因素。在该层中,优先形成的是TiFe和NiTi相,其次是TiCr2和(Fe, Cr)相。较高的结合温度和较长的保温时间显著促进了Ti与304L钢中Fe和Cr的相互扩散。界面处脆性fe和TiCr2相的富集导致接头性能下降。在760℃/60 min/10 MPa条件下,接头的峰值抗剪强度达到247 MPa,比直接扩散接头提高了115%。断裂主要发生在Ti/304L扩散层内的脆性相,如TiFe和TiCr2。
{"title":"Enhancement of interfacial structure and mechanical properties of Zr-3 alloy and 304L stainless steel diffusion bonded joint via Ti interlayer introduction","authors":"Zhuofu Wei ,&nbsp;Xiwen Hu ,&nbsp;Shiyu Niu ,&nbsp;Yuxin Wang ,&nbsp;Zhongliang Liu ,&nbsp;Zhenwen Yang ,&nbsp;Ying Wang","doi":"10.1016/j.vacuum.2026.115129","DOIUrl":"10.1016/j.vacuum.2026.115129","url":null,"abstract":"<div><div>To obtain the high-strength joint of zirconium alloy and stainless steel for nuclear applications, this study utilized a Ti interlayer for diffusion bonding of Zr-3 alloy and 304L stainless steel. Direct diffusion bonding resulted in the formation of numerous brittle intermetallic compounds, including Zr<sub>2</sub>(Fe, Ni) and Zr(Fe, Cr)<sub>2</sub>. The introduction of the Ti interlayer eliminated these phases, and the typical interfacial reaction layer of the joints was Zr-3/(Ti, Zr)/Ti/NiTi/TiFe/TiCr<sub>2</sub>/(Fe, Cr)/304L. The diffusion layer at the Ti/304L interface was identified as the key factor governing the joint's mechanical properties. Within this layer, TiFe and NiTi phases formed preferentially, followed by TiCr<sub>2</sub> and (Fe, Cr) phases. Higher bonding temperatures and longer holding times significantly promoted the interdiffusion of Ti with Fe and Cr from the 304L steel. This enrichment of brittle TiFe and TiCr<sub>2</sub> phases at the interface consequently degraded the joint properties. The joint achieved a peak shear strength of 247 MPa under the parameters of 760 °C/60 min/10 MPa, representing a 115 % increase compared to the direct diffusion-bonded joint. The fracture was primarily initiated in the brittle phases, such as TiFe and TiCr<sub>2</sub>, within the Ti/304L diffusion layer.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"247 ","pages":"Article 115129"},"PeriodicalIF":3.9,"publicationDate":"2026-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080117","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
Distribution of ion energy and concentration in the expansion region of radio-frequency inductive coupled plasmas with deuterium and deuterium-nitrogen mixtures 氘和氘氮混合物射频电感耦合等离子体膨胀区的离子能量和浓度分布
IF 3.9 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-01-20 DOI: 10.1016/j.vacuum.2026.115125
Xiao Xi , Xuxu Liu , Wei Jin , Jipeng Zhu , Hai Jin , Xiaoqiu Ye , Changan Chen
In this study, a 13.56 MHz radio frequency power supply was used to generate an external solenoid inductively coupled plasma source. An ion energy mass spectrometer equipped with a Bessel box and quadrupole mass filter was employed to investigate the characteristics of ion in expansion region. The ion species, concentration and their energy distributions with different working gases, including deuterium, nitrogen and their mixtures, have been analyzed by adjusting the gas flow rate or relative concentration over a wide parametric range. The results give the evolution of deuterium series D+/D2+/D3+, nitrogen series N+/N2+/N2D+, and the ammonia series ND+/ND2+/ND3+/ND4+. The ion energy distribution of D3+, N2+ and ND4+ display multi-peak distributions, indicating sheath voltage modulation and frequent collisional production in gas phase. The signal intensities and peak energies of these ions show distinct trends with respect to the gas flow rate. The reaction processes been given to illustrate the transformation path within and between different ion series. The reactions can be divided into three stages: ionization regime, intermediate regime and recombination regime, depending on the overall gas flow rate. And the N2D+ is an effective media during molecular assisted recombination stage. These results benefit plasma processing and chemical synthesis.
在本研究中,使用13.56 MHz射频电源产生外部电磁电感耦合等离子体源。采用配备贝塞尔箱和四极杆质量过滤器的离子能量质谱仪研究了膨胀区离子的特性。通过在较宽的参数范围内调节气体流速或相对浓度,分析了不同工作气体(包括氘、氮及其混合物)下离子的种类、浓度及其能量分布。得到了氘系D+/D2+/D3+、氮系N+/N2+/N2D+、氨系ND+/ND2+/ND3+/ND4+的演化规律。D3+、N2+和ND4+离子能量分布呈多峰分布,表明鞘层电压调制,气相频繁发生碰撞。这些离子的信号强度和峰值能量随气体流速的变化有明显的趋势。给出了反应过程来说明不同离子系内部和之间的转化路径。根据总气体流速的不同,反应可分为电离态、中间态和复合态三个阶段。N2D+是分子辅助重组阶段的有效载体。这些结果有利于等离子体加工和化学合成。
{"title":"Distribution of ion energy and concentration in the expansion region of radio-frequency inductive coupled plasmas with deuterium and deuterium-nitrogen mixtures","authors":"Xiao Xi ,&nbsp;Xuxu Liu ,&nbsp;Wei Jin ,&nbsp;Jipeng Zhu ,&nbsp;Hai Jin ,&nbsp;Xiaoqiu Ye ,&nbsp;Changan Chen","doi":"10.1016/j.vacuum.2026.115125","DOIUrl":"10.1016/j.vacuum.2026.115125","url":null,"abstract":"<div><div>In this study, a 13.56 MHz radio frequency power supply was used to generate an external solenoid inductively coupled plasma source. An ion energy mass spectrometer equipped with a Bessel box and quadrupole mass filter was employed to investigate the characteristics of ion in expansion region. The ion species, concentration and their energy distributions with different working gases, including deuterium, nitrogen and their mixtures, have been analyzed by adjusting the gas flow rate or relative concentration over a wide parametric range. The results give the evolution of deuterium series D<sup>+</sup>/D<sub>2</sub><sup>+</sup>/D<sub>3</sub><sup>+</sup>, nitrogen series N<sup>+</sup>/N<sub>2</sub><sup>+</sup>/N<sub>2</sub>D<sup>+</sup>, and the ammonia series ND<sup>+</sup>/ND<sub>2</sub><sup>+</sup>/ND<sub>3</sub><sup>+</sup>/ND<sub>4</sub><sup>+</sup>. The ion energy distribution of D<sub>3</sub><sup>+</sup>, N<sub>2</sub><sup>+</sup> and ND<sub>4</sub><sup>+</sup> display multi-peak distributions, indicating sheath voltage modulation and frequent collisional production in gas phase. The signal intensities and peak energies of these ions show distinct trends with respect to the gas flow rate. The reaction processes been given to illustrate the transformation path within and between different ion series. The reactions can be divided into three stages: ionization regime, intermediate regime and recombination regime, depending on the overall gas flow rate. And the N<sub>2</sub>D<sup>+</sup> is an effective media during molecular assisted recombination stage. These results benefit plasma processing and chemical synthesis.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"247 ","pages":"Article 115125"},"PeriodicalIF":3.9,"publicationDate":"2026-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025511","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
Research on the phase interface structure and orientation relationship of the intermetallic compounds layer in Sn-3.0Ag-0.5Cu/Cu joints during isothermal aging Sn-3.0Ag-0.5Cu/Cu接头等温时效过程中金属间化合物层相界面结构及取向关系研究
IF 3.9 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-01-20 DOI: 10.1016/j.vacuum.2026.115123
Dongdong Chen , Zan Long , Sirong Zhu , Huaxin Liang , Yuan Teng , Cunji Pu , Jikang Yan , Yanqing Lai , Jianhong Yi
The structure of the interfacial layer is important for evaluating the reliability of an electronic package. Herein, we comprehensively investigated the changes in morphology and thickness of intermetallic compounds interlayer during aging, the diffusion of elements during the reflow soldering and isothermal aging, as well as the phase structural and crystallographic relationships among β-Sn, Cu6Sn5, and Cu3Sn phases. After aging, Cu6Sn5/β-Sn interface exhibited special [010]βSn//[210]Cu6Sn5 crystallographic relationship, while the angle between (101)βSn and (121)Cu6Sn5 was 174.1°. Cu6Sn5/Cu3Sn interface showed special [111]Cu6Sn5//[001]Cu3Sn crystallographic relationship, while the angle between (312)Cu6Sn5 and (210)Cu3Sn was 58.7°. The growth patterns of Cu6Sn5 and Cu3Sn phases during isothermal aging were investigated further based on the interface orientation relationship. This study reported the growth of the interface IMCs layer via the interfacial structure of Cu6Sn5/β-Sn, Cu6Sn5/Cu3Sn, and Cu3Sn/Cu, which further improves the orientation relationship of interface phases. Meanwhile, this work provides a valuable basis for improving the reliability of solder service.
界面层的结构是评价电子封装可靠性的重要因素。本文全面研究了时效过程中金属间化合物层间形貌和厚度的变化,回流焊和等温时效过程中元素的扩散,以及β-Sn、Cu6Sn5和Cu3Sn相的相结构和晶体学关系。时效后,Cu6Sn5/β-Sn界面呈现出特殊的[010]β−Sn//[210]Cu6Sn5结晶关系,而(1 - 01)β−Sn与(1 - 21)Cu6Sn5之间的夹角为174.1°。Cu6Sn5/Cu3Sn界面表现出特殊的[111]Cu6Sn5//[001]Cu3Sn结晶关系,而(31 - 2)Cu6Sn5与(21 - 0)Cu3Sn之间的夹角为58.7°。基于界面取向关系,进一步研究了等温时效过程中Cu6Sn5和Cu3Sn相的生长规律。本研究报道了Cu6Sn5/β-Sn、Cu6Sn5/Cu3Sn、Cu3Sn/Cu三种界面结构下界面IMCs层的生长,进一步改善了界面相取向关系。同时,为提高焊料服务的可靠性提供了有价值的依据。
{"title":"Research on the phase interface structure and orientation relationship of the intermetallic compounds layer in Sn-3.0Ag-0.5Cu/Cu joints during isothermal aging","authors":"Dongdong Chen ,&nbsp;Zan Long ,&nbsp;Sirong Zhu ,&nbsp;Huaxin Liang ,&nbsp;Yuan Teng ,&nbsp;Cunji Pu ,&nbsp;Jikang Yan ,&nbsp;Yanqing Lai ,&nbsp;Jianhong Yi","doi":"10.1016/j.vacuum.2026.115123","DOIUrl":"10.1016/j.vacuum.2026.115123","url":null,"abstract":"<div><div>The structure of the interfacial layer is important for evaluating the reliability of an electronic package. Herein, we comprehensively investigated the changes in morphology and thickness of intermetallic compounds interlayer during aging, the diffusion of elements during the reflow soldering and isothermal aging, as well as the phase structural and crystallographic relationships among β-Sn, Cu<sub>6</sub>Sn<sub>5</sub>, and Cu<sub>3</sub>Sn phases. After aging, Cu<sub>6</sub>Sn<sub>5</sub><strong>/</strong>β-Sn interface exhibited special <span><math><mrow><msub><mrow><mo>[</mo><mn>010</mn><mo>]</mo></mrow><mrow><mi>β</mi><mo>−</mo><mi>S</mi><mi>n</mi></mrow></msub><mo>/</mo><mo>/</mo><msub><mrow><mo>[</mo><mn>210</mn><mo>]</mo></mrow><mrow><mi>C</mi><msub><mi>u</mi><mn>6</mn></msub><mi>S</mi><msub><mi>n</mi><mn>5</mn></msub></mrow></msub></mrow></math></span> crystallographic relationship, while the angle between <span><math><mrow><msub><mrow><mo>(</mo><mrow><mover><mn>1</mn><mo>‾</mo></mover><mn>01</mn></mrow><mo>)</mo></mrow><mrow><mi>β</mi><mo>−</mo><mi>S</mi><mi>n</mi></mrow></msub></mrow></math></span> and <span><math><mrow><msub><mrow><mo>(</mo><mrow><mover><mn>1</mn><mo>‾</mo></mover><mn>21</mn></mrow><mo>)</mo></mrow><mrow><mi>C</mi><msub><mi>u</mi><mn>6</mn></msub><mi>S</mi><msub><mi>n</mi><mn>5</mn></msub></mrow></msub></mrow></math></span> was 174.1°. Cu<sub>6</sub>Sn<sub>5</sub><strong>/</strong>Cu<sub>3</sub>Sn interface showed special <span><math><mrow><msub><mrow><mo>[</mo><mn>111</mn><mo>]</mo></mrow><mrow><mi>C</mi><msub><mi>u</mi><mn>6</mn></msub><mi>S</mi><mi>n</mi><mn>5</mn></mrow></msub><mo>/</mo><mo>/</mo><msub><mrow><mo>[</mo><mn>001</mn><mo>]</mo></mrow><mrow><mi>C</mi><msub><mi>u</mi><mn>3</mn></msub><mi>S</mi><mi>n</mi></mrow></msub></mrow></math></span> crystallographic relationship, while the angle between <span><math><mrow><msub><mrow><mo>(</mo><mrow><mn>3</mn><mover><mn>1</mn><mo>‾</mo></mover><mover><mn>2</mn><mo>‾</mo></mover></mrow><mo>)</mo></mrow><mrow><mi>C</mi><msub><mi>u</mi><mn>6</mn></msub><mi>S</mi><msub><mi>n</mi><mn>5</mn></msub></mrow></msub></mrow></math></span> and <span><math><mrow><msub><mrow><mo>(</mo><mrow><mn>2</mn><mover><mn>1</mn><mo>‾</mo></mover><mn>0</mn></mrow><mo>)</mo></mrow><mrow><mi>C</mi><msub><mi>u</mi><mn>3</mn></msub><mi>S</mi><mi>n</mi></mrow></msub></mrow></math></span> was 58.7°. The growth patterns of Cu<sub>6</sub>Sn<sub>5</sub> and Cu<sub>3</sub>Sn phases during isothermal aging were investigated further based on the interface orientation relationship. This study reported the growth of the interface IMCs layer via the interfacial structure of Cu<sub>6</sub>Sn<sub>5</sub><strong>/</strong>β-Sn, Cu<sub>6</sub>Sn<sub>5</sub><strong>/</strong>Cu<sub>3</sub>Sn, and Cu<sub>3</sub>Sn/Cu, which further improves the orientation relationship of interface phases. Meanwhile, this work provides a valuable basis for improving the reliability of solder service.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"247 ","pages":"Article 115123"},"PeriodicalIF":3.9,"publicationDate":"2026-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146025498","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
A carbon nanotubes cathode ionization gauge with a straight path of electrons 一种碳纳米管阴极电离计,具有电子的直线路径
IF 3.9 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-01-20 DOI: 10.1016/j.vacuum.2026.115102
Guoheng Yu , Detian Li , Huzhong Zhang , Weijun Huang , Changkun Dong , Zhenhua Xi , Gang Li , Zhangyi Zhong , Weidong Kang
Carbon nanotubes (CNTs) are a type of field emission cathode material with broad application potential. Compared with hot filament cathodes, CNTs cathodes possess advantages such as low operating temperature and energy efficiency. In this article, a CNTs electron emitter is integrated into an ionization gauge featuring a straight electron path. A series of tests were performed on the CNTs cathode and the prototype gauge. The optimal operating potential of the prototype gauge was determined through simulations and experiments. The prototype achieved a sensitivity of 0.317 Pa1 in argon and 0.240 Pa1 in nitrogen. This prototype gauge exhibits good linearity in the range from 10−6 Pa to 10−3 Pa in argon and nitrogen, while its sensitivity fluctuations are 1.17 % and 3.2 %, and within half an hour, the sensitivity fluctuations in the two gases are 1.6 % and 2.2 % respectively. Under simulated normal operating conditions, the repeatability is less than 3 %. This novel developed ionization gauge has simultaneously achieved high sensitivity and good stability. This study provides insights for the application of CNTs cathodes in the ionization gauges.
碳纳米管是一种具有广泛应用潜力的场发射阴极材料。与热丝阴极相比,CNTs阴极具有工作温度低、能效高等优点。在本文中,将碳纳米管电子发射器集成到具有直电子路径的电离计中。对碳纳米管阴极和原型压力表进行了一系列测试。通过仿真和实验,确定了原型仪表的最佳工作电位。样品在氩气和氮气中的灵敏度分别为0.317 Pa−1和0.240 Pa−1。在10−6 Pa ~ 10−3 Pa的氩气和氮气环境中,样品表具有良好的线性关系,灵敏度波动幅度分别为1.17%和3.2%,半小时内,两种气体的灵敏度波动幅度分别为1.6%和2.2%。在模拟正常工作条件下,重复性小于3%。这种新型电离计具有高灵敏度和良好的稳定性。本研究为碳纳米管阴极在电离计中的应用提供了新的思路。
{"title":"A carbon nanotubes cathode ionization gauge with a straight path of electrons","authors":"Guoheng Yu ,&nbsp;Detian Li ,&nbsp;Huzhong Zhang ,&nbsp;Weijun Huang ,&nbsp;Changkun Dong ,&nbsp;Zhenhua Xi ,&nbsp;Gang Li ,&nbsp;Zhangyi Zhong ,&nbsp;Weidong Kang","doi":"10.1016/j.vacuum.2026.115102","DOIUrl":"10.1016/j.vacuum.2026.115102","url":null,"abstract":"<div><div>Carbon nanotubes (CNTs) are a type of field emission cathode material with broad application potential. Compared with hot filament cathodes, CNTs cathodes possess advantages such as low operating temperature and energy efficiency. In this article, a CNTs electron emitter is integrated into an ionization gauge featuring a straight electron path. A series of tests were performed on the CNTs cathode and the prototype gauge. The optimal operating potential of the prototype gauge was determined through simulations and experiments. The prototype achieved a sensitivity of 0.317 Pa<sup>−</sup><sup>1</sup> in argon and 0.240 Pa<sup>−</sup><sup>1</sup> in nitrogen. This prototype gauge exhibits good linearity in the range from 10<sup>−6</sup> Pa to 10<sup>−3</sup> Pa in argon and nitrogen, while its sensitivity fluctuations are 1.17 % and 3.2 %, and within half an hour, the sensitivity fluctuations in the two gases are 1.6 % and 2.2 % respectively. Under simulated normal operating conditions, the repeatability is less than 3 %. This novel developed ionization gauge has simultaneously achieved high sensitivity and good stability. This study provides insights for the application of CNTs cathodes in the ionization gauges.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"247 ","pages":"Article 115102"},"PeriodicalIF":3.9,"publicationDate":"2026-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026014","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
Fabrication and characterization of core-shell HEA-reinforced 316L composite prepared by LPBF LPBF制备核壳hea增强316L复合材料的制备与表征
IF 3.9 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-01-20 DOI: 10.1016/j.vacuum.2026.115122
Qiqi Chen, Xueli Zhao, Shaoning Niu, Xini Xiong, Yongjuan Dai, Shaofeng Yang
This study introduced the laser powder bed fusion of core-shell AlCrFeCoNi high-entropy alloy (HEA)-reinforced 316L stainless steel matrix composites (MMCs) with enhanced mechanical performance. To prevent diffusion between the HEA and the 316L matrix during the forming process, a core-shell structured HEA-reinforcing phase was prepared by an in-situ hydrolysis reaction of a silicon source salt. The microstructural characteristics and mechanical properties of LPBF-fabricated MMCs containing 20 wt% AlCrFeCoNi were systematically examined. Microstructural analysis revealed that core-shell HEAs with a single BCC phase were homogeneously dispersed within the 316L matrix, effectively transforming the coarse-grained microstructure into a refined one. This grain refinement can be attributed to the heterogeneous nucleation effect induced by the core-shell HEA particles during solidification. The 20 wt% HEA-316L composite exhibited higher strength and fracture toughness, namely a yield strength of 759±2 MPa, ultimate tensile strength of 798±2 MPa, and elongation of 29.6 ± 1.5 %.
本研究采用激光粉末床熔接技术制备了具有增强力学性能的AlCrFeCoNi高熵合金增强316L不锈钢基复合材料。为了防止HEA在形成过程中与316L基体之间的扩散,采用硅源盐原位水解法制备了核壳结构的HEA增强相。系统地研究了含20wt % AlCrFeCoNi的lpbf制备的mmc的显微组织特征和力学性能。显微组织分析表明,具有单一BCC相的核壳HEAs均匀分散在316L基体中,有效地将粗晶组织转变为精细化组织。这种晶粒细化可归因于核壳HEA颗粒在凝固过程中诱导的非均质成核效应。20 wt%的HEA-316L复合材料具有较高的强度和断裂韧性,屈服强度为759±2 MPa,极限抗拉强度为798±2 MPa,伸长率为29.6±1.5%。
{"title":"Fabrication and characterization of core-shell HEA-reinforced 316L composite prepared by LPBF","authors":"Qiqi Chen,&nbsp;Xueli Zhao,&nbsp;Shaoning Niu,&nbsp;Xini Xiong,&nbsp;Yongjuan Dai,&nbsp;Shaofeng Yang","doi":"10.1016/j.vacuum.2026.115122","DOIUrl":"10.1016/j.vacuum.2026.115122","url":null,"abstract":"<div><div>This study introduced the laser powder bed fusion of core-shell AlCrFeCoNi high-entropy alloy (HEA)-reinforced 316L stainless steel matrix composites (MMCs) with enhanced mechanical performance. To prevent diffusion between the HEA and the 316L matrix during the forming process, a core-shell structured HEA-reinforcing phase was prepared by an in-situ hydrolysis reaction of a silicon source salt. The microstructural characteristics and mechanical properties of LPBF-fabricated MMCs containing 20 wt% AlCrFeCoNi were systematically examined. Microstructural analysis revealed that core-shell HEAs with a single BCC phase were homogeneously dispersed within the 316L matrix, effectively transforming the coarse-grained microstructure into a refined one. This grain refinement can be attributed to the heterogeneous nucleation effect induced by the core-shell HEA particles during solidification. The 20 wt% HEA-316L composite exhibited higher strength and fracture toughness, namely a yield strength of 759±2 MPa, ultimate tensile strength of 798±2 MPa, and elongation of 29.6 ± 1.5 %.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"247 ","pages":"Article 115122"},"PeriodicalIF":3.9,"publicationDate":"2026-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080124","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
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Vacuum
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