Synthesis of Hexagonal FeMnP Thin Films from a Single‐Source Molecular Precursor

Abstract

The first heterobimetallic phosphide thin film containing iron, manganese, and phosphorus, derived from the single-source precursor FeMn(CO) (μ-PH ), has been prepared using a home-built metal-organic chemical vapor deposition apparatus. The thin film contains the same ratio of iron, manganese, and phosphorus as the initial precursor. The film becomes oxidized when deposited on a quartz substrate, whereas the film deposited on an alumina substrate provides a more homogeneous product. Powder X-ray diffraction confirms the formation of a metastable, hexagonal FeMnP phase that was previously only observed at temperatures above 1200 °C. Selected area electron diffraction on single crystals isolated from the films was indexed to the hexagonal phase. The effective moment of the films (μ =3.68 μ ) matches the previously reported theoretical value for the metastable hexagonal phase, whereas the more stable orthorhombic phase is known to be antiferromagnetic. These results not only demonstrate the successful synthesis of a bimetallic, ternary thin film from a single-source precursor, but also the first low temperature approach to the hexagonal phase of FeMnP.

Bimetallic Manganese Cobalt Phosphide Nanodots–Modified Graphitic Carbon Nitride for High‐Performance Hydrogen Production

“…The Co 2p XPS spectrum is shown in Figure d, where the peaks at 777.3 eV (Co 2p 3/2 ) and 789.3 eV (Co 2p 1/2 ) stem from the Co—P bond in Mn 0.67 Co 1.33 P, the peaks at 781.1 eV (Co 2p 3/2 ) and 796.5 eV (Co 2p 1/2 ) result from Co 2+ and Co 3+ states in the Mn 0.67 Co 1.33 P surface, as well as the peaks at 784.7 eV (Co 2p 3/2 ) and 801.3 eV (Co 2p 1/2 ) result from the spin orbit splitting of Co . The Mn 2p XPS spectrum shown in Figure e only presents four peaks obtained from oxidation states of Mn at 639.9, 644.1, 652.3, and 654.5 eV, which is because of the surface oxidation of Mn 0.67 Co 1.33 P . In addition, the P 2p XPS spectrum shown in Figure f shows two peaks at 128.5 and 133.1 eV, which originate from P in Mn 0.67 Co 1.33 P and phosphate/phosphite (PO 4 − and others) on the surface, respectively .…”

Magnetocaloric materials: From micro- to nanoscale

“…Both films exhibit a FM and superparamagnetic nature due to their small crystallite sizes. 105 It is important to remark the stability of the Fe 2 P hexagonal phase in all the above-mentioned nanostructures in contrast with the metastable nature of this phase in the bulk compounds, typically requiring a long series of high temperature thermal treatments. Unfortunately, there are no published reports completely dedicated to the influence of size-reduction on the magnetocaloric properties of Fe 2 P or more generally (Mn,Fe) 2 (P,Si).…”

Effects of Catalyst Phase on the Hydrogen Evolution Reaction of Water Splitting: Preparation of Phase-Pure Films of FeP, Fe2P, and Fe3P and Their Relative Catalytic Activities

“…In this way, Fe 3 P and FeMnP thin films on quartz have been obtained using H 2 Fe 3 (CO) 9 P t Bu and FeMn(CO) 8 (μ-PH 2 ) as precursors. 21,22 The method was extended to afford additional compositional variation by codecomposing isostructural precursors with varying stoichiometry. This yielded (Fe 1-…”