Electronic Materials Letters最新文献_第8页

Relationship Between Electrical Conductivity and Supercapacitor Properties of Co3O4 Nanofibers Fabricated by Electrospinning 电纺丝法制造的 Co3O4 纳米纤维的电导率与超级电容器性能之间的关系

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Electronic Materials Letters

Pub Date : 2023-10-24 DOI: 10.1007/s13391-023-00461-0

Hyo-Min Choi, Jong-Won Yoon

Co₃O₄ with a spinel structure has been utilized as supercapacitor materials due to their active surface sites, strong absorption capacity, excellent electrochemical activity, and stability. In this study, we tried to explore the optimized electrospinning conditions, including heat-treatment temperature for Co₃O₄ nanofiber fabrication for supercapacitor applications. The X-ray diffraction patterns of Co₃O₄ nanofibers annealed at 600 and 800 ºC showed a cubic spinel crystal structure without a secondary phase, but CoO was found in the specimens annealed at 400 ºC. From the XPS curve fitting, Co³⁺ increased in the Co³⁺/Co²⁺ ratio with increasing heat-treatment temperature. The electrical conductivity of the Co₃O₄ nanofibers heated at 400, 600, and 800 ºC is 7.53 × 10⁻³, 1.12 × 10⁻², and 6.26 × 10⁻³ Ω⁻¹ cm⁻¹, respectively. The Co₃O₄ nanofibers heat treated at 600 ºC showed the highest conductivity value, and the conduction mechanism was polaron hopping between Co³⁺ and Co²⁺. The supercapacitor properties of Co₃O₄ nanofibers are evaluated by cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance measurement using a three-electrode system in a 3 M KOH electrolyte. The GCD tests showed that the Co₃O₄ nanofibers heated at 600 ºC had the highest specific capacitance of 579.66 F/g. From the electrochemical impedance measurements, the charge transfer resistance (R_ct) of calcined Co₃O₄ nanofibers at 600 ºC showed the lowest value of 1.27 Ω. Also, the Co₃O₄ nanofiber exhibits excellent cycle stability with capacitance retention over 99% until 1000 cycles at a current density of 2 A/g. Therefore, the excellent supercapacitor performance of Co₃O₄ nanofibers annealed at 600 ºC is due to its nanofiber structure without a secondary phase providing a larger surface area and charge transfer.

Graphical Abstract

具有尖晶石结构的 Co3O4 因其表面活性位点、强大的吸收能力、优异的电化学活性和稳定性而被用作超级电容器材料。在本研究中，我们试图探索用于制造超级电容器用 Co3O4 纳米纤维的最佳电纺条件，包括热处理温度。在 600 ºC 和 800 ºC 下退火的 Co3O4 纳米纤维的 X 射线衍射图样显示出立方尖晶石晶体结构，没有第二相，但在 400 ºC 下退火的试样中发现了 CoO。从 XPS 曲线拟合结果来看，随着热处理温度的升高，Co3+/Co2+ 的比值增大。在 400、600 和 800 ºC 下加热的 Co3O4 纳米纤维的导电率分别为 7.53 × 10-3、1.12 × 10-2 和 6.26 × 10-3 Ω-1 cm-1。在 600 ºC 下热处理的 Co3O4 纳米纤维显示出最高的电导率值，其传导机制是 Co3+ 和 Co2+ 之间的极子跳变。在 3 M KOH 电解液中使用三电极系统，通过循环伏安法（CV）、电静态充放电法（GCD）和电化学阻抗测量法评估了 Co3O4 纳米纤维的超级电容器特性。GCD 测试表明，在 600 ºC 下加热的 Co3O4 纳米纤维的比电容最高，达到 579.66 F/g。电化学阻抗测量结果表明，在 600 ºC 下煅烧的 Co3O4 纳米纤维的电荷转移电阻（Rct）最低，为 1.27 Ω。此外，Co3O4 纳米纤维还表现出优异的循环稳定性，在电流密度为 2 A/g 的条件下，循环 1000 次后电容保持率超过 99%。因此，在 600 ºC 下退火的 Co3O4 纳米纤维之所以具有优异的超级电容器性能，是因为它的纳米纤维结构没有次级相，具有更大的表面积和电荷转移能力。

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引用次数: 0

Rationalized Molten-Salt Synthesis of Carbon-Enriched Pb-C Composite for Lead-Acid Battery Positive Electrode Grids 铅酸电池正极栅格富碳铅碳复合材料的合理熔盐合成

4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Electronic Materials Letters

Pub Date : 2023-10-10 DOI: 10.1007/s13391-023-00463-y

Jaewook Kim, Jahun Koo, Byungwoo Park, Chunjoong Kim, Chong Rae Park

引用次数: 0

Spin Route Flipping in FeCo/RR-P3HT/ NiFe Organic Spin-Valve Device FeCo/RR-P3HT/ NiFe 有机自旋阀器件中的自旋路线翻转

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Electronic Materials Letters

Pub Date : 2023-09-28 DOI: 10.1007/s13391-023-00460-1

Manikandan Gunasekaran, Dhanalakshmi Dhandapani, Manivel Raja Muthuvel

An organic semiconductor (OSC) is a potential material in spintronics which is posses a long spin diffusion length due to its low spin-orbit coupling and hyperfine interaction. Among the OSC P3HT that already exists, in spintronic devices. In this report, An organic spin valve (OSV) device was fabricated using Regioregular Poly 3-hexylthiophene-2,5- diyl (RR-P3HT). The RR-P3HT was used as a spacer layer, with FeCo and NiFe used as bottom and top electrodes, respectively. The device magnetoresistance (MR) was observed to be a positive MR of 2.9% at 50 K while negative MR of 0.6, 0.4, and 0.014% were observed at 150, 200, and 300 K, respectively. Observed AMR is positive at room temperature for Feco and NiFe single layer as 0.08 and 0.18%, respectively. The magnetic electrodes were prepared using Ultra High Vacuum DC magnetron sputtering, and RR-P3HT was prepared using a spin coater. The magnetic properties of the device were studied by vibrating sample magnetometer (VSM) analysis. The VSM results conclude that both electrodes are magnetic materials with different coercive forces. The FeCo and NiFe, both electrodes crystal structures were analyzed from Gracing Incidence X-Ray Diffraction (GI-XRD) using Cobalt K alpha. FeCo and NiFe were the Body-Centered Cubic crystal structures, and the electrode’s JCPDS card numbers are 50–0795 and 37–0474, respectively.

Graphical Abstract

有机半导体（OSC）是一种潜在的自旋电子学材料，由于其自旋轨道耦合和超细相互作用较低，因此具有较长的自旋扩散长度。在已有的自旋电子器件中，P3HT 是一种有机半导体。在本报告中，我们使用 Regioregular Poly 3-hexylthiophene-2,5- diyl (RR-P3HT) 制作了一个有机自旋阀（OSV）器件。RR-P3HT 用作间隔层，FeCo 和 NiFe 分别用作底部和顶部电极。器件磁阻（MR）在 50 K 时为正 2.9%，而在 150、200 和 300 K 时分别为负 0.6%、0.4% 和 0.014%。在室温下观察到的 Feco 和 NiFe 单层 AMR 分别为 0.08% 和 0.18%。磁电极采用超高真空直流磁控溅射法制备，RR-P3HT 采用旋涂机制备。通过振动样品磁力计（VSM）分析研究了该器件的磁性能。VSM 分析结果表明，两种电极都是具有不同矫顽力的磁性材料。利用钴 K 阿尔法入射 X 射线衍射（GI-XRD）分析了铁钴和镍铁合金这两种电极的晶体结构。FeCo和NiFe为体心立方晶体结构，电极的JCPDS卡号分别为50-0795和37-0474。

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引用次数: 0

Electrodeposited Palladium Coating on Co Micro-Nano Cones Array for Low-Temperature Solid-State Bonding 用于低温固态键合的钴微纳米锥阵列上的电沉积钯涂层

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Electronic Materials Letters

Pub Date : 2023-09-25 DOI: 10.1007/s13391-023-00462-z

Jiunan Xie, Hua Hu, Peixin Chen, Han Lei, Anmin Hu, Yunwen Wu, Ming Li

A low-temperature solid-state bonding technology using palladium-coated Co micro-nano cones array (MCA) and Sn-3.0Ag-0.5Cu (wt%) solder was investigated. The Pd modification layer on the surface of Co MCA reduced the growth of oxide film. Low-temperature solid-state bonding was achieved using Co/Pd MCA under the bonding condition of 750 gf, 175 °C and 150 s with the shear strength of 49.55 MPa, and there was no void found along the bonding interface. Microscopic observation revealed that Co/Pd MCA was fully embedded in the soft solder. The average shear strength of the bonding joint was measured and demonstrate that Co/Pd MCA has higher reliability than Co MCA. This work highlights the advantages of bonding based on Co/Pd MCA, which has great potential for extensive practical applications.

Graphical Abstract

研究了使用钯涂层钴微纳锥阵列（MCA）和锡-3.0Ag-0.5Cu（重量百分比）焊料的低温固态接合技术。Co MCA 表面的钯改性层减少了氧化膜的生长。在 750 gf、175 °C、150 s 的粘合条件下，Co/Pd MCA 实现了低温固态粘合，剪切强度为 49.55 MPa，粘合界面没有发现空隙。显微观察表明，Co/Pd MCA 完全嵌入了软焊料中。测量了接合点的平均剪切强度，结果表明 Co/Pd MCA 比 Co MCA 具有更高的可靠性。这项工作凸显了基于 Co/Pd MCA 的键合技术的优势，具有广泛的实际应用潜力。

引用次数: 0

Thermoelectric Transport Properties of Co0.5Fe0.5Se2, Co0.5Fe0.5Te2, and Their Solid-Solution Compositions Co0.5Fe0.5Se2、Co0.5Fe0.5Te2 及其固溶体化合物的热电传输特性

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Electronic Materials Letters

Pub Date : 2023-09-22 DOI: 10.1007/s13391-023-00459-8

Sang Jeong Park, Seyun Kim, Okmin Park, Se Woong Lee, Sang-il Kim

Transition-metal chalcogenides with tunable electronic transport properties and unique crystal structures have attracted much attention as potential thermoelectric materials. In this study, the electrical, thermal, and thermoelectrical transport properties of Co_0.5Fe_0.5Se₂, Co_0.5Fe_0.5Te₂ and a series of solid-solution compositions (Co_0.5Fe_0.5(Se_1−yTe_y)₂, y = 0.25, 0.5, and 0.75) were investigated. Co_0.5Fe_0.5Se₂ and Co_0.5Fe_0.5Te₂ polycrystalline alloys exhibited high power factors of 1.37 and 1.53 mW/mK² at 600 K, respectively, and their solid-solution compositions exhibited lower power factors between 0.38 and 0.81 mW/mK². The lattice thermal conductivities of Co_0.5Fe_0.5Se₂ and Co_0.5Fe_0.5Te₂ were 2.87 and 1.71 W/mK at 300 K, respectively, and their solid-solution compositions exhibited lower lattice thermal conductivities between 0.96 and 1.98 W/mK. Consequently, the thermoelectric figure of merit (zT) of the Co_0.5Fe_0.5Se₂ and Co_0.5Fe_0.5Te₂ polycrystalline alloys was 0.16 and 0.18 at 600 K, respectively, and the zT of their solid-solution composition exhibited lower values between 0.04 and 0.09. As the solid-solution composition exhibited a lower thermoelectric performance than the Co_0.5Fe_0.5Se₂ and Co_0.5Fe_0.5Te₂ polycrystalline alloys, the lower thermoelectric performance was analyzed and discussed.

Graphical Abstract

作为一种潜在的热电材料，具有可调电子传输特性和独特晶体结构的过渡金属卤化物备受关注。本研究调查了 Co0.5Fe0.5Se2、Co0.5Fe0.5Te2 和一系列固溶体成分（Co0.5Fe0.5(Se1-yTey)2, y = 0.25、0.5 和 0.75）的电学、热学和热电传输特性。Co0.5Fe0.5Se2 和 Co0.5Fe0.5Te2 多晶合金在 600 K 时的功率因数分别高达 1.37 和 1.53 mW/mK2，而其固溶体成分的功率因数则较低，介于 0.38 和 0.81 mW/mK2 之间。在 300 K 时，Co0.5Fe0.5Se2 和 Co0.5Fe0.5Te2 的晶格热导率分别为 2.87 和 1.71 W/mK，它们的固溶体成分表现出较低的晶格热导率，介于 0.96 和 1.98 W/mK 之间。因此，在 600 K 时，Co0.5Fe0.5Se2 和 Co0.5Fe0.5Te2 多晶合金的热电功勋值（zT）分别为 0.16 和 0.18，而其固溶体成分的 zT 值较低，介于 0.04 和 0.09 之间。由于固溶体成分的热电性能低于 Co0.5Fe0.5Se2 和 Co0.5Fe0.5Te2 多晶合金，因此对其较低的热电性能进行了分析和讨论。

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引用次数: 0

Copper, Palladium, and Reduced Graphene Oxide Co-doped Layered WS2/WO3 Nanostructures for Electrocatalytic Hydrogen Generation 用于电催化制氢的铜、钯和还原石墨烯氧化物共掺杂层状 WS2/WO3 纳米结构

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Electronic Materials Letters

Pub Date : 2023-09-12 DOI: 10.1007/s13391-023-00458-9

Vipin Kumar, Rajneesh Kumar Mishra, Le Gia Trung, Pushpendra Kumar, Sagar M. Mane, Jae Cheol Shin, Jin Seog Gwag

Fossil fuels have a vital role in global energy resources. The burning of fossil fuels produces pollutants and harms the environment. These environmental problems can be solved by searching for a substitute for fossil fuels. Hydrogen production by water electrolysis has emerged as a promising substitute. It is a green, clean, and renewable energy source. Low-cost water is abundant on the Earth. The metal and its composite material have been used to develop water electrolysis. Among these composite catalytic materials, WS₂/WO₃ composite catalyst is well-known for its excellent physical and chemical behavior in water electrolysis to produce hydrogen. Engineered catalysts can further enhance the catalytic performance. Therefore, we investigate and analyze the catalytic performance of copper (Cu), palladium (Pd), and r-GO co-doped WS₂/WO₃ composite material for water electrolysis to produce green, clean, and renewable hydrogen energy by hydrogen evolution reaction (HER). The hydrothermal synthesis method is used to prepare the WS₂/WO₃ composite material co-doped with Cu, Pd, and r-GO. The co-doping is favorable for fast charge transfer by providing many active catalytic sites for HER and enhancing the HER catalytic performance. Therefore, the co-doped tungsten disulfide/oxide could be a potential composite material for efficient water electrolysis for clean and renewable hydrogen production by electrochemical water electrolysis.

Graphical Abstract

化石燃料在全球能源资源中发挥着至关重要的作用。化石燃料的燃烧会产生污染物，对环境造成危害。这些环境问题可以通过寻找化石燃料的替代品来解决。水电解制氢已成为一种前景广阔的替代品。它是一种绿色、清洁和可再生能源。地球上有大量低成本的水。金属及其复合材料已被用于开发水电解。在这些复合催化材料中，WS2/WO3 复合催化剂因其在电解水制氢过程中优异的物理和化学性能而闻名。工程催化剂可进一步提高催化性能。因此，我们研究并分析了铜（Cu）、钯（Pd）和r-GO共掺杂的WS2/WO3复合材料在水电解中的催化性能，以利用氢进化反应（HER）生产绿色、清洁和可再生的氢能。该研究采用水热合成法制备了共掺杂 Cu、Pd 和 r-GO 的 WS2/WO3 复合材料。共掺杂为 HER 提供了许多活性催化位点，有利于电荷的快速转移，从而提高 HER 的催化性能。因此，共掺杂的二硫化钨/氧化物可以成为一种潜在的复合材料，用于高效电解水，通过电化学电解水法生产清洁和可再生氢气。

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引用次数: 0

Electrodeposited Ternary CuNiMo Catalysts for Alkaline Hydrogen Oxidation 用于碱性氢氧化的电沉积三元铜镍钼催化剂

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Electronic Materials Letters

Pub Date : 2023-09-10 DOI: 10.1007/s13391-023-00457-w

Hong Seong Park, Kyeong-Rim Yeo, Won Suk Jung, Soo-Kil Kim

In this study, we investigated ternary transition metal catalysts composed of Cu, Ni, and Mo for application to hydrogen oxidation reaction (HOR) in alkaline electrolyte. A series of catalysts with a wide range of elemental compositions were fabricated by a simple electrodeposition method, and their material and electrochemical properties were investigated. In particular, to avoid inaccurate activity measurements due to oxidation and reduction of the transition metal-based catalysts during the HOR test, the electrochemical measurements were performed in both H₂- and N₂-saturated electrolytes, and the results were compared. The fabricated CuNiMo catalyst with an optimized composition exhibited an excellent HOR activity of 2.03 mA cm⁻² at 0.1 V_RHE, while the current density decreased only by 0.55 mA cm⁻² after 3000 cycles. The enhanced HOR activity is attributed to the combined effects of the modified crystal structure, increased surface area, alloying effects beneficial to the hydrogen binding energy and OH⁻ binding energy, and appropriate surface compositions between the H-adsorbing metallic state and OH-adsorbing oxophilic states. The characteristics of the catalyst demonstrated in this study can provide insights for the development of non-precious catalysts for HOR in alkaline electrolytes.

Graphical Abstract

本研究探讨了由铜、镍和钼组成的三元过渡金属催化剂在碱性电解液中氢氧化反应（HOR）中的应用。通过简单的电沉积方法制备了一系列元素组成范围广泛的催化剂，并研究了它们的材料和电化学特性。特别是，为了避免在 HOR 测试过程中由于过渡金属基催化剂的氧化和还原而导致活性测量不准确，电化学测量同时在 H2- 和 N2 饱和电解质中进行，并对结果进行了比较。具有优化成分的铜镍钼催化剂在 0.1 VRHE 条件下表现出 2.03 mA cm-2 的优异 HOR 活性，而电流密度在 3000 次循环后仅下降了 0.55 mA cm-2。HOR 活性的提高归功于改良的晶体结构、增大的表面积、有利于氢结合能和羟基结合能的合金效应以及吸附 H 的金属态和吸附羟基的亲氧化态之间适当的表面成分的综合作用。本研究中展示的催化剂特性可为开发用于碱性电解质中 HOR 的非贵金属催化剂提供启示。

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引用次数: 0

Improvement of Microwave Dielectric Properties of MgTiO3 Ceramics by Ti-Site Complex Substitution ti位络合物取代改善MgTiO3陶瓷的微波介电性能

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Electronic Materials Letters

Pub Date : 2023-09-05 DOI: 10.1007/s13391-023-00456-x

Jong Seok Chung, Eung Soo Kim

Microwave dielectric properties of MgTi_1-x(Mn_1/3Nb_2/3)_xO₃ (0 ≤ x ≤ 0.05) ceramics were investigated based on their crystal structure characteristics. For the specimens sintered at 1400 °C for 4 h, complete solid solutions with a single phase and an ilmenite structure were obtained for the entire range of compositions. The quality factor (Qf) was dependent on the average Ti-site covalency related to the electronegativity difference and the reduction state of Ti⁴⁺. MgTi_0.995(Mn_1/3Nb_2/3)_0.005O₃ exhibited the highest Qf value of 212,000 GHz owing to the high average covalency obtained from the Rietveld refinement of X-ray Diffraction patterns, high binding energy, and small full width at half maximum of Ti 2p peaks, as confirmed by X-ray Photoelectron Spectroscopy of MgTiO₃ –based ceramics. The temperature coefficients of the resonant frequency (TCF) of MgTiO₃-based ceramics were dependent on the degree of average oxygen octahedral distortion of the ilmenite structure. The dielectric constant (K) was affected by the theoretical dielectric polarizability of the constituent ions of sintered specimens. Excellent microwave dielectric properties were obtained for MgTi_0.995(Mn_1/3Nb_2/3)_0.005O₃; K = 18.05, Qf = 212,000 GHz, TCF = − 37.04 ppm/°C. The microwave dielectric properties were improved by substituting (Mn_1/3Nb_2/3)⁴⁺ for Ti⁴⁺ in MgTiO₃-based ceramics.

Graphical Abstract

根据 MgTi1-x(Mn1/3Nb2/3)xO3（0 ≤ x ≤ 0.05）陶瓷的晶体结构特征，研究了其微波介电性能。对于在 1400 °C 下烧结 4 小时的试样，在整个成分范围内都获得了具有单相和钛铁矿结构的完整固溶体。品质因数（Qf）取决于与电负性差异和 Ti4+ 的还原状态有关的平均 Ti 位共价。MgTi0.995(Mn1/3Nb2/3)0.005O3 的 Qf 值最高，达到 212,000 GHz，这是因为根据 X 射线衍射图样的里特维尔德细化得到的平均共价率高、结合能高、Ti 2p 峰的半最大全宽小，这一点已通过 MgTiO3 基陶瓷的 X 射线光电子能谱分析得到证实。MgTiO3 基陶瓷的共振频率温度系数（TCF）取决于钛铁矿结构的八面体平均氧畸变程度。介电常数（K）受烧结试样中组成离子的理论介电极化率的影响。MgTi0.995(Mn1/3Nb2/3)0.005O3 获得了优异的微波介电性能；K = 18.05，Qf = 212,000 GHz，TCF = - 37.04 ppm/°C。通过在 MgTiO3 基陶瓷中用 (Mn1/3Nb2/3)4+ 代替 Ti4+，微波介电性能得到了改善。图文摘要

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引用次数: 0

A Soluble ‘Ba(Ni-ett)’ (ett = 1,1,2,2-Ethenetetrathiolate) Derived Thermoelectric Material 可溶性‘Ba（Ni ett）’（ett = 1,1,2,2-四硫代乙烯酯）衍生的热电材料

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Electronic Materials Letters

Pub Date : 2023-09-01 DOI: 10.1007/s13391-023-00454-z

Yaoyang Hu, Geoffrey Rivers, Michael P. Weir, David B. Amabilino, Christopher J. Tuck, Ricky D. Wildman, Oleg Makarovsky, Simon Woodward

We describe the synthesis and characterisation of the first of a new class of soluble ladder oligomeric thermoelectric material based on previously unutilised ethene-1,1,2,2-tetrasulfonic acid. Reaction of Ba(OH)₂ and propionic acid at a 1:1 stoichiometry leads to the formation of the previously unrecognised soluble [Ba(OH)(O₂CEt)]⋅H₂O. The latter when used to hydrolyse 1,3,4,6-tetrathiapentalene-2,5-dione (TPD), in the presence of NiCl₂, forms a new material whose elemental composition is in accord with the formula [(EtCO₂Ba)₄Ni₈{(O₃S)₂C = C(SO₃)₂}₅]⋅22H₂O (4). Compound 4 can be pressed into pellets, drop-cast as DMSO solutions or ink-jet printed (down to sub-mm resolutions). While its room temperature thermoelectric properties are modest (σ_max 0.04 S cm⁻¹ and Seebeck coefficient, α_max − 25.8 μV K⁻¹) we introduce a versatile new oligomeric material that opens new possible synthetic routes for n-type thermoelectrics.

Graphical Abstract

我们描述了基于以前未利用的乙烯-1,1,2,2-四磺酸的第一种新型可溶性梯形低聚热电材料的合成和特性。Ba(OH)2和丙酸以1:1的比例发生反应，形成了以前未曾认识到的可溶性[Ba(OH)(O2CEt)]⋅H2O。后者在 NiCl2 的存在下用于水解 1,3,4,6-四硫杂戊烯-2,5-二酮（TPD）时，会形成一种新材料，其元素组成符合[(EtCO2Ba)4Ni8{(O3S)2C = C(SO3)2}5]⋅22H2O（4）式。化合物 4 可压制成颗粒、滴铸成 DMSO 溶液或喷墨打印（分辨率可达亚毫米）。虽然它的室温热电性能不高（σmax 0.04 S cm-1 和塞贝克系数 αmax - 25.8 μV K-1），但我们介绍了一种多功能的新型低聚物材料，它为 n 型热电材料开辟了新的合成途径。

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引用次数: 0

Effects of Surface Oxidation on the Magnetic Properties of Fe-Based Amorphous Metal Powder Made by Atomization Methods 表面氧化对雾化法制备铁基非晶金属粉末磁性能的影响

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Electronic Materials Letters

Pub Date : 2023-08-28 DOI: 10.1007/s13391-023-00455-y

Tae-Kyung Lee, Seung-Wook Kim, Dae-Yong Jeong

The demand for soft magnetic amorphous metal powders with high saturation magnetization values and low energy loss has increased to achieve high-performance inductors for mobile electronic devices. In this study, Fe-based Fe_92.3Si_3.5B_3.0C_0.7P_0.5 (wt.%) amorphous metal powders were prepared using different atomization methods for controlling the surface oxidation of the metal alloy powder. Conventional high-pressure water atomization and the newly developed high-speed water screen atomization methods were used for preparation. Regardless of the preparation methods, both alloy powders were amorphous, and their magnetic flux density (Bs) values were more than 165 emu/g. Compared to the powders from the conventional high-pressure water atomization method, the amorphous metal powder manufactured using the high-speed water screen atomization process had lower eddy current loss because of the formation of a thin and uniform oxide layer. Furthermore, the magnetic properties of the consolidated magnetic cores fabricated with the amorphous powders produced by the high-speed water screen atomization method using compact-pressing techniques were characterized. Magnetic powders with fewer surface oxidation layers exhibited increased initial permeability and a smaller coercive field, leading to a lower core loss value. The magnetic core made from Fe_92.3Si_3.5B_3.0C_0.7P_0.5 (wt.%) amorphous powder with an oxide content of 0.12 (wt.%) using the high-speed water screen atomization method exhibited an initial permeability of 25 in the frequency range up to 5 MHz, and a loss of 237 mW/cm³ with B_m = (0.2,{text{T}}) at 1 MHz.

Graphical Abstract

为实现移动电子设备的高性能电感器，对具有高饱和磁化值和低能量损失的软磁非晶金属粉末的需求日益增加。本研究采用不同的雾化方法制备了Fe92.3Si3.5B3.0C0.7P0.5（重量百分比）非晶金属粉末，以控制金属合金粉末的表面氧化。制备方法包括传统的高压水雾化法和新开发的高速水筛雾化法。无论采用哪种制备方法，两种合金粉末都是无定形的，其磁通密度（Bs）值都大于 165 emu/g。与传统高压水雾化法制备的粉末相比，高速水筛网雾化法制备的非晶态金属粉末由于形成了薄而均匀的氧化层，因此涡流损耗较低。此外，还对使用高速水筛网雾化法生产的非晶粉末通过压制技术制造的固结磁芯的磁性能进行了表征。表面氧化层较少的磁粉显示出更高的初始磁导率和更小的矫顽力场，从而导致更低的磁芯损耗值。使用高速水筛分雾化法由氧化物含量为 0.12（重量百分比）的 Fe92.3Si3.5B3.0C0.7P0.5（重量百分比）无定形粉末制成的磁芯在高达 5 MHz 的频率范围内显示出 25 的初始磁导率，在 1 MHz 时 Bm = (0.2,{text/{T}}/)的损耗为 237 mW/cm3。

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