{"title":"通过扩散法合成低矫顽力有序相 Fe-64%Ni 纳米粒子","authors":"Kunio Akedo, Koji Noda","doi":"10.1007/s11051-024-06010-6","DOIUrl":null,"url":null,"abstract":"<p>FeNi nanoparticles are promising candidates for the magnetic cores of transformers and inductors operating at high frequencies. When applied to magnetic cores, reducing the coercive force (<i>Hc</i>) is crucial to suppress heat generation. Face-centered cubic FeNi is a low <i>Hc</i> material with two phases: a disordered phase and an ordered phase. The disordered phase exhibits the lowest <i>Hc</i> in Fe-78.5%Ni, while the ordered phase has the lowest <i>Hc</i> in Fe-64%Ni. These phases can be controlled through specific heat-treatment conditions. However, an in-depth investigation into the relationship between heat treatment, crystal structure, and <i>Hc</i> of FeNi nanoparticles has not been conducted until now. In this study, we elucidated the changes in the crystal structure, and <i>Hc</i> of Fe-64%Ni and Fe-78.5%Ni nanoparticles synthesized through a diffusion-based liquid-phase method employing heat treatment to reduce <i>Hc</i>. Initially, the Fe-78.5%Ni nanoparticles demonstrated low <i>Hc</i> but also low saturation magnetization (<i>Ms</i>). Upon performing heat treatment to enhance <i>Ms</i>, an increase in <i>Hc</i> occurred due to the transformation from the disordered phase changes to the ordered phase. Consequently, achieving both low <i>Hc</i> and high <i>Ms</i> proved challenging. Conversely, Fe-64%Ni nanoparticles exhibited high <i>Hc</i> and <i>Ms</i> in their synthesized state. However, through heat treatment, <i>Hc</i> could be lowered owing to the disordered-ordered transition. Therefore, by controlling the composition and crystal phase, FeNi nanoparticles with low <i>Hc</i> and high <i>Ms</i> can be obtained. Notably, Fe-64%Ni with the ordered phase heat-treated at 250 °C exhibited the lowest <i>Hc</i>.</p>","PeriodicalId":653,"journal":{"name":"Journal of Nanoparticle Research","volume":null,"pages":null},"PeriodicalIF":2.1000,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Synthesis of low-coercivity ordered-phase Fe-64%Ni nanoparticles via diffusion-based method\",\"authors\":\"Kunio Akedo, Koji Noda\",\"doi\":\"10.1007/s11051-024-06010-6\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>FeNi nanoparticles are promising candidates for the magnetic cores of transformers and inductors operating at high frequencies. When applied to magnetic cores, reducing the coercive force (<i>Hc</i>) is crucial to suppress heat generation. Face-centered cubic FeNi is a low <i>Hc</i> material with two phases: a disordered phase and an ordered phase. The disordered phase exhibits the lowest <i>Hc</i> in Fe-78.5%Ni, while the ordered phase has the lowest <i>Hc</i> in Fe-64%Ni. These phases can be controlled through specific heat-treatment conditions. However, an in-depth investigation into the relationship between heat treatment, crystal structure, and <i>Hc</i> of FeNi nanoparticles has not been conducted until now. In this study, we elucidated the changes in the crystal structure, and <i>Hc</i> of Fe-64%Ni and Fe-78.5%Ni nanoparticles synthesized through a diffusion-based liquid-phase method employing heat treatment to reduce <i>Hc</i>. Initially, the Fe-78.5%Ni nanoparticles demonstrated low <i>Hc</i> but also low saturation magnetization (<i>Ms</i>). Upon performing heat treatment to enhance <i>Ms</i>, an increase in <i>Hc</i> occurred due to the transformation from the disordered phase changes to the ordered phase. Consequently, achieving both low <i>Hc</i> and high <i>Ms</i> proved challenging. Conversely, Fe-64%Ni nanoparticles exhibited high <i>Hc</i> and <i>Ms</i> in their synthesized state. However, through heat treatment, <i>Hc</i> could be lowered owing to the disordered-ordered transition. Therefore, by controlling the composition and crystal phase, FeNi nanoparticles with low <i>Hc</i> and high <i>Ms</i> can be obtained. Notably, Fe-64%Ni with the ordered phase heat-treated at 250 °C exhibited the lowest <i>Hc</i>.</p>\",\"PeriodicalId\":653,\"journal\":{\"name\":\"Journal of Nanoparticle Research\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.1000,\"publicationDate\":\"2024-05-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Nanoparticle Research\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1007/s11051-024-06010-6\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Nanoparticle Research","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s11051-024-06010-6","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
纳米镍铁粒子是变压器和高频电感器磁芯的理想候选材料。应用于磁芯时,降低矫顽力(Hc)对抑制发热至关重要。面心立方铁镍是一种低 Hc 材料,有两相:无序相和有序相。无序相在 Fe-78.5%Ni 中的 Hc 最低,而有序相在 Fe-64%Ni 中的 Hc 最低。这些相可以通过特定的热处理条件来控制。然而,到目前为止,还没有人对铁镍纳米粒子的热处理、晶体结构和 Hc 之间的关系进行过深入研究。在本研究中,我们阐明了通过基于扩散的液相法合成的 Fe-64%Ni 和 Fe-78.5%Ni 纳米粒子的晶体结构和 Hc 的变化,并利用热处理来降低 Hc。最初,Fe-78.5%Ni 纳米粒子的 Hc 值较低,但饱和磁化率(Ms)也较低。在进行热处理以提高 Ms 时,由于从无序相转变为有序相,Hc 出现了增加。因此,同时实现低 Hc 和高 Ms 具有挑战性。相反,Fe-64%Ni 纳米粒子在合成状态下表现出较高的 Hc 和 Ms。然而,通过热处理,由于无序-有序转变,Hc 可以降低。因此,通过控制成分和晶相,可以获得低 Hc 和高 Ms 的铁镍纳米粒子。值得注意的是,在 250 °C 下热处理的有序相 Fe-64%Ni 的 Hc 最低。
Synthesis of low-coercivity ordered-phase Fe-64%Ni nanoparticles via diffusion-based method
FeNi nanoparticles are promising candidates for the magnetic cores of transformers and inductors operating at high frequencies. When applied to magnetic cores, reducing the coercive force (Hc) is crucial to suppress heat generation. Face-centered cubic FeNi is a low Hc material with two phases: a disordered phase and an ordered phase. The disordered phase exhibits the lowest Hc in Fe-78.5%Ni, while the ordered phase has the lowest Hc in Fe-64%Ni. These phases can be controlled through specific heat-treatment conditions. However, an in-depth investigation into the relationship between heat treatment, crystal structure, and Hc of FeNi nanoparticles has not been conducted until now. In this study, we elucidated the changes in the crystal structure, and Hc of Fe-64%Ni and Fe-78.5%Ni nanoparticles synthesized through a diffusion-based liquid-phase method employing heat treatment to reduce Hc. Initially, the Fe-78.5%Ni nanoparticles demonstrated low Hc but also low saturation magnetization (Ms). Upon performing heat treatment to enhance Ms, an increase in Hc occurred due to the transformation from the disordered phase changes to the ordered phase. Consequently, achieving both low Hc and high Ms proved challenging. Conversely, Fe-64%Ni nanoparticles exhibited high Hc and Ms in their synthesized state. However, through heat treatment, Hc could be lowered owing to the disordered-ordered transition. Therefore, by controlling the composition and crystal phase, FeNi nanoparticles with low Hc and high Ms can be obtained. Notably, Fe-64%Ni with the ordered phase heat-treated at 250 °C exhibited the lowest Hc.
期刊介绍:
The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size.
Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology.
The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.