hexaamminecobalt(III) hexacyanoferrate(III) 在
H2 作用下,
以
neat (no solvent) 为溶剂,
生成 iron cobalt
参考文献:
名称:
Anion effect on the thermolysis of double complexes [Co(NH3)6][Fe(CN)6] and [Co(NH3)6]4[Fe(CN)6]3
摘要:
The thermolysis of complexes [Co(NH3)(6)][Fe(CN)(6)] and [Co(NH3 (6)](4)[Fe(CN)(6)](3) under an air or hydrogen atmosphere at 200, 350, and 500 degrees C is studied. The composition and properties of thermolysis products are determined. The oxidative thermolysis yields mixtures of oxides of the central metals; the reductive thermolysis yields intermetallic compounds CoFe. The density of the complexes and the specific surface area of the intermetallic compounds are measured. Average particle sizes are calculated. The morphology and dispersion of the powders are dictated by the shape and density of the crystals of the precursor double salts and the thermolysis temperature. The thermolysis chemism in the oxidative and reductive atmospheres is discussed in the context of the nature of the complex anion.
At the frontier between heterogeneous and homogeneous catalysis: hydrogenation of olefins and alkynes with soluble iron nanoparticles
作者:Claudine Rangheard、César de Julián Fernández、Pim-Huat Phua、Johan Hoorn、Laurent Lefort、Johannes G. de Vries
DOI:10.1039/c0dt00177e
日期:——
nanoparticles in the hydrogenation of unsaturated C–C bonds is a green catalytic concept at the frontier between homogeneous and heterogeneous catalysis. Iron nanoparticles can be obtained by reducing Fe salts with strong reductants in various solvents. FeCl3 reduced by 3 equivalents of EtMgCl forms an active catalyst for the hydrogenation of a range of olefins and alkynes. Olefinhydrogenation is relatively
Neue Synthesen mit Magnesiumhydrid. Teil 3: Herstellung nanokristalliner und amorpher Metalle durch Hydridreduktion / New Syntheses with Magnesium Hydride. Part 3: Preparation of Nanocrystalline or Amorphous Metals by Hydride Reduction
作者:Wilfried Knott、Georg Georg Frommeyer、Astrid Klapdor、Dagmar Windbiela
DOI:10.1515/znb-1998-0412
日期:1998.4.1
Abstract
The tribochemical reduction of metal halides by magnesium hydride in organic solvents allows the synthesis of nanosize or amorphous metals.
摘要
在有机溶剂中,镁氢化物对金属卤化物进行摩擦化学还原,可以合成纳米尺寸或非晶态金属。
Structural and magnetic studies on spark plasma sintered SmCo5/Fe bulk nanocomposite magnets
consolidated into bulk shape by spark plasma sintering (SPS) technique. The evolution of structure and magnetic properties were systematically investigated in milled powders as well as in SPS samples. A maximum coercivity of 8.9 kOe was achieved in spark plasma sintered SmCo 5 +5 wt% Fe sample. The exchange spring interaction between the hard and soft magnetic phases was evaluated using δ M – H measurements
摘要 SmCo 5 + x wt% Fe ( x = 0 、 5 和 10 ) 纳米复合粉末通过机械研磨合成,并通过放电等离子烧结 (SPS) 技术固结成块状。在研磨粉末和 SPS 样品中系统地研究了结构和磁性的演变。在放电等离子体烧结的 SmCo 5 +5 wt% Fe 样品中实现了 8.9 kOe 的最大矫顽力。使用 δ M – H 测量评估硬磁相和软磁相之间的交换弹簧相互作用,分析表明,含有 5 wt% Fe 的 SPS 样品比含有 10 wt% Fe 的样品在磁相之间具有更强的交换耦合.
Tailoring the heterogeneous magnetostriction in Fe-Co alloys
Abstract Traditionally, magnetostriction of ferromagnetic materials was considered as an intrinsic homogeneous effect. More recently, the magnetostriction in certain binary systems such as Fe-Ga alloys, has been associated with nanoscale heterogeneities, but evidence of a direct relation between the heterogeneities and magnetostriction was lacking. Here heterogeneous magnetostriction controlled by nanoinclusions
摘要 传统上,铁磁材料的磁致伸缩被认为是一种固有的均匀效应。最近,某些二元系统(如 Fe-Ga 合金)中的磁致伸缩与纳米级异质性有关,但缺乏异质性与磁致伸缩之间直接关系的证据。在 Fe-Co 合金中报道了由纳米夹杂物控制的异质磁致伸缩,其中最大值出现在两相共存区域。使用同步加速器 X 射线衍射和具有几何相分析的高分辨率 TEM 对 Fe-Co 合金中纳米结构相关的磁致伸缩进行系统研究,使我们能够确定 B2 类和 fcc 类纳米夹杂物的性质,这些纳米夹杂物是导致该系统中增强的磁致伸缩。磁致伸缩与纳米异质性之间的关系是通过根据合金成分和退火温度调整纳米夹杂物的尺寸来建立的。这提供了纳米夹杂物诱导的增强磁致伸缩的直接实验证据。最后,提出了一个模型来解释具有有序类 B2 结构或类 fcc 结构的相干夹杂物如何在相关两相区域引起基体的四方畸变,从而增强磁致伸缩。结果阐明了磁致伸缩机制,并可能刺激寻找
Strong magnetic coupling between antiferromagnetic and ferromagnetic phases in polycrystalline hollow nanoparticles composed of spinel solid solution
作者:G. Hassnain Jaffari、M. Bah、S. Ismat Shah
DOI:10.1016/j.jallcom.2020.157607
日期:2021.3
composed of an antiferromagnetic phase, which was predominantly Co3-δFeδO4, and a ferromagnetic phase, Co1+γFe2-γO4. The antiferromagnetic phase showed a relative increase in its concentration with the increase in Co content. The magnetic response includes high field thermoremanent magnetization in antiferromagnetic phase, ferromagnetic crystal size, increased anisotropy due to antiferromagnetic and surface