A transmission electron microscope study of iron phosphide precipitates in InP crystals

Nakahara, S.; Chu, S. N. G.; Long, J.; Riggs, V. G.; Johnston, W. D.

doi:10.1016/0022-0248(85)90222-2

Cited by 32 publications

(6 citation statements)

References 7 publications

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“…(a) Synthesis and Characterization. The XRD pattern of FeP is depicted Figure a and reveals sharp Bragg peaks, indicative of a highly crystalline sample, which could all be indexed on the basis of an orthorhombic cell with lattice parameters similar to those reported in the literature ( a = 5.193(1) Å, b = 3.099(1) Å, c = 5.792(1) Å, Pnma ). , Within the FeP unit cell, Fe is coordinated by six P atoms in a nearly hexagonal configuration with Fe−P distances between 2.186 and 2.447 Å. Some Fe−P distances are smaller than the sum of the covalent radii (1.17 Å) and suggest a high degree of covalence for these bonds, in agreement with previous experimental and theoretical analyses of chemical bonding in transition metal phosphides. , The structure can be viewed (inset of Figure a) as a closely packed FeP 6 edge- and face-sharing structure.…”

Section: Resultssupporting

confidence: 60%

FeP: Another Attractive Anode for the Li-Ion Battery Enlisting a Reversible Two-Step Insertion/Conversion Process

et al. 2006

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FeP y (y = 1, 2, 4) anodes all react with lithium through a conversion reaction FeP y + 3yLi → yLi3P + Fe0 in their first discharge, leading to nanocomposite discharged electrodes described by nanosized Fe0 particles embedded in yLi3P matrixes. From electrochemical and complementary in situ X-ray diffraction and high-resolution transmission electron microscopy studies, we deduce that the conversion reaction occurring during the first discharge is followed by two successive insertion and conversion processes in further cycles for the FeP electrode. The insertion process is highly reversible, leading to a capacity retention of 300 mA h g-1 and 1900 mA h cm-3 after 100 cycles, and corresponds to the formation of an intermediate tetragonal LiFeP phase as deduced from first-principles T = 0 K phase diagram calculations and preliminary Mössbauer analyses. We expect the kinetics of this reaction to be strongly limited by the increase in y, thus leading to an increasing capacity fading when increasing the y P/Fe ratio.

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Section: Resultssupporting

confidence: 60%

FeP: Another Attractive Anode for the Li-Ion Battery Enlisting a Reversible Two-Step Insertion/Conversion Process

et al. 2006

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“…FEM MRO structure analysis of FeNiP. Normalized variance V ( k ) profiles calculated from sets of NBDPs measured on Fe‐ and Ni‐rich areas of the layered nanorod are compared to literature values (vertical lines) from a) FEM studies a [ 45 ] ) or simulated variance curves of NiP b [ 46 ] ), diffraction data of FeNi c [ 47 ] ), and TEM studies of FeP d [ 48 ] ,e [ 49 ] ).…”

Section: Resultsmentioning

confidence: 99%

“…[ 45 ] And peaks at 3.6, 3.9, and 5.2 nm −1 are found in studies on calculated or experimental diffraction data of FeP. [ 48,49 ] The remaining peaks at 4.8, 5.6, and 7.9 nm −1 are assigned to diffraction data of FeNi. [ 47 ] Qualitatively, the two variance profiles show some peaks at the same position, which means that the proposed assignments to distinct clusters are valid for both Ni‐ and Fe‐rich areas but might differ in size or quantity.…”

Section: Resultsmentioning

confidence: 99%

“…The peaks in the FEM data are compared to literature values (vertical lines) from literature FEM studies (a [45] ) or simulated variance curves of NiP (b [46] ). Also diffraction data of FeNi (c [47] ) and TEM studies of FeP (d [48] ,e [49] ) are drawn for comparison.…”

Section: Fluctuation Electron Microscopymentioning

confidence: 99%

“…[8,52] Since the Z number of Fe (26) and Ni( 28) is quite similar, only the change of P(15) atoms in a structure might change the diffracted intensity and thus the FEM signal significantly. However, the overall or averaged Z of a coherently scattering atom configuration in a nominal Fe 40 Ni 40 P 20 at% mixture can only in extreme cases (e.g., pure P clusters) compete with the [45] ) or simulated variance curves of NiP b [46] ), diffraction data of FeNi c [47] ), and TEM studies of FeP d [48] ,e [49] ).…”

Section: Fluctuation Electron Microscopymentioning

confidence: 99%

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Direct View on Non‐Equilibrium Heterogeneous Dynamics in Glassy Nanorods

Spangenberg

Hilke

Wilde

et al. 2021

Adv Funct Materials

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Amorphous solids are potential candidates for room temperature applications, such as structural materials, due to their outstanding mechanical properties. For the first time, the local atomic dynamics of amorphous metallic nanorods are spatially resolved at room temperature using electron microscopy. Methodologically, quasi-equilibrium conditions are verified by two-time correlation functions. FeNiP is chosen as a suitable model system since a bamboo structure forms upon electrodeposition into nanotubular confinement, consisting of thin Fe-rich and Ni-rich amorphous layers. Therefore, the present nano-glassy structure allows studying the glass dynamics of two glassy phases at once, at the same time avoiding any preparation-related structural artifacts of the intrinsically electron-transparent samples. By comparing the local atomic mobility with the local composition and the local structural information of the glassy phases, correlations between medium-range order and time scales of heterogeneous glassy dynamics are consistently obtained.

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First Row Transition Metal Phosphides

Whitmire

Caudell

2004

Encyclopedia of Inorganic and Bioinorganic Chemistry

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A review with 209 references of the binary and ternary metal phosphides for the first row transition metals. A large variety exists in M:P stoichiometry for this class of compounds although a number of general trends are easily identified. Compounds with different transition metals having the same M:P ratio often adopt similar crystallographic forms, providing tremendous flexibility in producing isostructural ternary or higher order compounds over a wide composition range. In some cases, however, a given M:P stoichiometry can choose to crystallize in one of two different crystal systems depending on transition metal, temperature, pressure, and dopant metals. Common features of the variety of structural types are presented. Crystal data are tabulated for compounds exhibiting a variety of different M:P stoichiometries for each transition metal in the first series. For ternary phosphides containing more than one first row transition metal, crystal data is also presented showing that these compounds adopt the structure of one of the parent metals involved. The metal phosphides have been well‐studied for the electronic, magnetic, and catalytic properties and a number of examples of these properties are presented.

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A transmission electron microscope study of iron phosphide precipitates in InP crystals

Cited by 32 publications

References 7 publications

FeP: Another Attractive Anode for the Li-Ion Battery Enlisting a Reversible Two-Step Insertion/Conversion Process

FeP: Another Attractive Anode for the Li-Ion Battery Enlisting a Reversible Two-Step Insertion/Conversion Process

Direct View on Non‐Equilibrium Heterogeneous Dynamics in Glassy Nanorods

First Row Transition Metal Phosphides

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