A General Methodology for the Synthesis of Transition Metal Pnictide Nanoparticles from Pnictate Precursors and Its Application to Iron−Phosphorus Phases
摘要:
Nanoparticles of iron phosphide have been prepared through a new strategy involving the reductive annealing of nanoparticulate iron phosphate precursors cast onto atomically flat mica surfaces. This route appears to be general for a range of transition metals and pnicogens and avoids the use of highly toxic and pyrophoric agents such as Pn(SiMe3)3 (Pn = P, As), which are commonly employed in the synthesis of pnictide nanoparticles.
Solution-Phase Synthesis of Single-Crystalline Iron Phosphide Nanorods/Nanowires
作者:Cheng Qian、Franklin Kim、Lei Ma、Frank Tsui、Peidong Yang、Jie Liu
DOI:10.1021/ja038401c
日期:2004.2.1
A solution-phase route for the preparation of single-crystalline iron phosphide nanorods and nanowires is reported. We have shown that the mixture of trioctylphosphine oxide (TOPO) and trioctylphosphine (TOP), which are commonly used as the solvents for semiconductor nanocrystal synthesis, is not entirely inert. In the current process, TOP, serving as phosphor source, reacts with Fe precursors to form
报道了用于制备单晶磷化铁纳米棒和纳米线的液相路线。我们已经证明,通常用作半导体纳米晶体合成溶剂的三辛基氧化膦 (TOPO) 和三辛基膦 (TOP) 的混合物并非完全惰性。在目前的工艺中,作为荧光粉源的 TOP 与 Fe 前驱体反应形成具有大纵横比的 FeP 纳米结构。此外,实验结果表明 TOP 和 TOPO 都是形成 FeP 纳米线所必需的,它们的比例似乎控制着所产生的 FeP 结构的形态。讨论了一种可能的增长机制。
Synthesis of MnP Nanocrystals by Treatment of Metal Carbonyl Complexes with Phosphines: A New, Versatile Route to Nanoscale Transition Metal Phosphides
作者:Susanthri C. Perera、Georgy Tsoi、Lowell E. Wenger、Stephanie L. Brock
DOI:10.1021/ja038037h
日期:2003.11.1
temperatures, rather than the metamagnetic state observed in bulk (microcrystalline) MnP. The synthetic methodology reported here is demonstrated to be general for a number of different metals and phosphine sources.
Transition metal substitution in Fe2P-based MnFe0.95P0.50Si0.50 magnetocaloric compounds
作者:Z.Q. Ou、N.H. Dung、L. Zhang、L. Caron、E. Torun、N.H. van Dijk、O. Tegus、E. Brück
DOI:10.1016/j.jallcom.2017.09.315
日期:2018.1
Abstract The crystalstructure, magnetic and magnetocaloric properties of (Mn,Fe,T) 1.95 P 0.50 Si 0.50 (T = Co, Ni and Cu) compounds have been investigated. All the compounds crystallize in the Fe2 P-type hexagonal structure. All these transitionmetal substitutions for either Mn(3 g ) or Fe(3 f ) weaken the ferromagnetic ordering, while showing complex effects on the energy barrier for nucleation
摘要 研究了(Mn,Fe,T) 1.95 P 0.50 Si 0.50 (T = Co、Ni 和Cu) 化合物的晶体结构、磁性和磁热性能。所有化合物均以Fe 2 P型六方结构结晶。所有这些对 Mn(3 g ) 或 Fe(3 f ) 的过渡金属取代都削弱了铁磁有序,同时对一级磁相变中成核的能垒显示出复杂的影响,并导致热/磁的复杂行为滞后。第一性原理密度泛函理论计算表明,Co、Ni 和 Cu 原子分别占据 3 f 、3 f 和 3 g 位点。
Structure, magnetism and magnetocalorics of Fe-rich (Mn,Fe)1.95P1-Si melt-spun ribbons
作者:Z.Q. Ou、L. Zhang、N.H. Dung、L. Caron、E. Brück
DOI:10.1016/j.jallcom.2017.03.266
日期:2017.7
Mn 0.66 Fe 1.29 P 1- x Si x compounds, T C and Δ T hys are not only Si content dependent, but also magnetic field dependent. By increasing the Si content from x = 0.24 to 0.42, T C increases from 195 to 451 K and Δ T hys is strongly reduced from ∼61 to ∼1 K. T C increases and Δ T hys decreases with increasing magnetic field, Δ T C /Δ B is about 4.4 K/T. Mn 0.66 Fe 1.29 P 1- x Si x compounds show large
摘要 采用熔纺(快速凝固)技术合成了单相Mn 0.66 Fe 1.29 P 1- x Si x (0 ≤ x ≤ 0.42) 化合物。除了不含Si的Mn 0.66 Fe 1.29 P化合物的Co 2 P型正交结构外,所有化合物均以Fe 2 P型六方结构形成。0.24 ≤ x ≤ 0.42 的化合物呈现 FM-PM 相变,而 Si 含量较低的化合物呈现 AFM-PM 相变。在Mn 0.66 Fe 1.29 P 1- x Si x 化合物中,TC 和Δ T hys 不仅与Si 含量有关,而且与磁场有关。通过将 Si 含量从 x = 0.24 增加到 0.42,TC 从 195 K 增加到 451 K,并且 Δ T hys 从~61 大幅降低到~1 K。随着磁场的增加,TC 增加而 Δ T hys 减少B约为4.4K/T。锰 0.66 铁 1。29 P 1- x Si x 化合物显示出大的饱和磁矩,其值高达4
Oxidation Does Not (Always) Kill Reactivity of Transition Metals: Solution-Phase Conversion of Nanoscale Transition Metal Oxides to Phosphides and Sulfides
作者:Elayaraja Muthuswamy、Stephanie L. Brock
DOI:10.1021/ja106397b
日期:2010.11.17
reaction with sulfur. The reactivity can be attributed to the small size of the precursor particles, since attempts to convert bulk oxides or even particles with sizes approaching 50 nm were unsuccessful. Overall, the use of oxide nanoparticles, which are easily accessed via reaction of inexpensive salts with air, in lieu of organometallic reagents (e.g., metal carbonyls), which may or may not be transformed
据报道,在≤370°C 的温度下,氧化物纳米粒子部分的意外反应性使其能够通过分别与三辛基膦 (TOP) 或硫的溶液相反应转化为磷化物或硫化物。令人印象深刻的是,生产了单相磷化物产品,在某些情况下具有可控的各向异性和窄多分散性。Ni、Fe 和 Co 证明了该方法的通用性,虽然锰氧化物对 TOP 的反应不足以形成磷化物,但它们在与硫反应时确实会产生 MnS。反应性可归因于前体颗粒的小尺寸,因为尝试转化体氧化物或什至尺寸接近 50 nm 的颗粒均未成功。总的来说,使用氧化物纳米粒子,通过廉价的盐与空气的反应很容易获得,而不是有机金属试剂(例如,金属羰基化合物),它可能会或可能不会转化为金属纳米颗粒,极大地简化了纳米级磷化物和硫化物的生产。前体纳米粒子可以很容易地大量生产并以固态储存,而不必担心“氧化”会限制它们的反应性。