The Crystal Structures of CuP2 and AgP2 with some Phase Analytical Data of the Cu-P and Ag-P Systems.

Olofsson, Olle; Hassel, O.; Sillén, Lars Gunnar; Gronowitz, Salo; Hoffman, Ragnar A.; Westerdahl, Anders

doi:10.3891/acta.chem.scand.19-0229

Cited by 54 publications

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“…Overall, the main diffraction pattern changes from CuP 2 to Cu 3 P with increasing carbon content. More specifically, the broad peaks observed in Figure (a) are indexable to CuP 2 (space group: P 2 1 /c), indicating the formation of pure CuP 2 by ball‐milling. Peak broadening was observed after ball‐milling over 30 h .…”

Section: Resultsmentioning

confidence: 97%

Optimization of the Carbon Content in Copper Phosphide–Carbon Composites for High Performance Sodium Secondary Batteries Using Ionic Liquids

et al. 2020

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Negative electrode materials with a large capacity and long cycle life are required for practical large‐scale sodium secondary batteries. Copper phosphide‐carbon composites containing various carbon contents were investigated for this purpose using an ionic liquid (IL) electrolyte. The composites were prepared by a two‐step high energy ball‐milling process: preparation of copper phosphide (CuP2) and composite formation between CuP2 and acetylene black (AB) at different ratios. A CuP2 to Cu3P phase transition was observed at AB contents of 30 and 40 wt%. The sample containing 30 wt% AB gave an optimal electrochemical performance (98.9 % capacity retention, 350 cycles, reversible capacity=358 mAh g−1 at 8000 mA g−1 and 90 °C), and upon cycling at 25 °C, a high capacity retention of 111 % was achieved (350 cycles). Ex situ XRD revealed the reversible conversion of Cu3P and the formation of Na3P during charging. The high performance was attributed to the P−O−C bond and the robust interfacial layer formed in the IL.

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Section: Resultsmentioning

confidence: 97%

Optimization of the Carbon Content in Copper Phosphide–Carbon Composites for High Performance Sodium Secondary Batteries Using Ionic Liquids

et al. 2020

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“…An elaboration of this argument could be achieved by least-squares refinements optimizing interatomic distances and angles (Shoemaker & Shoemaker, 1967;Meier & Villiger, 1969;Baur, 1971). Olofsson (1965) and von Schnering & Menge (1976) have noted ten-membered P rings in the CdP 4 type structure. Such rings are also present in the FeP 4 and RuP4 structures (Fig.…”

Section: Discussionmentioning

confidence: 99%

Synthesis and crystal structure of the iron polyphosphide FeP₄

Jeitschko¹,

Braun²

1978

Acta Crystallogr Sect B

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Crystals of FeP 4 were prepared by reaction of the elemental components at elevated temperatures in silica tubes in the presence of small amounts of iodine or from a tin flux. They show a profound tendency for twinning and their crystal structure was determined from 'single-crystal' counter data of a twinned crystal.FeP 4 is monoclinic, space group P2Jc, a = 4.619 (1), b = 13.670 (2), c = 7.002 (1) ,~,,fl = 101-48 (2) °, Z = 6. For 877 unique structure factors, which do not overlap in reciprocal space of the twin, a final R value of 0.051 was obtained. The Fe atoms are in octahedral P coordination. The P atoms are tetrahedrally coordinated by Fe and P atoms. All near-neighbor interactions can be interpreted as two-electron bonds and thus Fe obtains low-spin d 6 configuration (formal oxidation number + 2) in agreement with its diamagnetism.While the metal atoms in CrP 4 (d 4 configuration for Cr) and MnP 4 (Mn in d 5 configuration) form Cr chains and Mn pairs respectively, no short Fe-Fe distances exist in FeP 4. Like the structures of CdP 4 and RuP4, the FeP 4 structure can be visualized as a layer structure with parallel sheets of linked MP 6 octahedra. Correspondingly the two-dimensionally extended P polyanions in these three polyphosphides consist of differently condensed, puckered, ten-membered rings.

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“…The Cu 3 P phase is˛Cu 3 P with the P 63cm space group in the low-temperature region and transforms toˇCu 3 P with P 3m1 at higher temperatures. The crystal structures of the CuP 2 and Cu 2 P 7 compounds are P 2 1 =c [20] and C 2=m [21], respectively. The liquidus temperatures in the Cu-rich region were determined by Guillet [22], Heyn and Bauer [23], and Lindlief [24].…”

Section: The Cu-p Binary Systemmentioning

confidence: 99%

Thermodynamic Analysis of the Cu-Sn-P Ternary System

Hino¹,

Iikubo²,

Ohtani³

2011

High Temperature Materials and Processes

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A thermodynamic analysis of the Cu-Sn-P system was performed using the CALPHAD technique. To overcome the lack of experimental information on thermodynamic properties, the formation enthalpies of binary and ternary phosphides were evaluated using a first-principles energetic calculation method; specific heats of these phosphides at constant pressure were also calculated using the quasiharmonic and Debye-Grüneisen approximations. We concluded that the ternary compound Cu 4 SnP 10 , detected experimentally using X-ray investigation, was unstable; however because of lack of data on its thermodynamic properties, further experimental and thermodynamic investigations on this ternary phosphide are required.

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The Crystal Structures of CuP2 and AgP2 with some Phase Analytical Data of the Cu-P and Ag-P Systems.

Cited by 54 publications

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Optimization of the Carbon Content in Copper Phosphide–Carbon Composites for High Performance Sodium Secondary Batteries Using Ionic Liquids

Optimization of the Carbon Content in Copper Phosphide–Carbon Composites for High Performance Sodium Secondary Batteries Using Ionic Liquids

Synthesis and crystal structure of the iron polyphosphide FeP₄

Thermodynamic Analysis of the Cu-Sn-P Ternary System

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The Crystal Structures of CuP2 and AgP2 with some Phase Analytical Data of the Cu-P and Ag-P Systems.

Cited by 54 publications

References 0 publications

Optimization of the Carbon Content in Copper Phosphide–Carbon Composites for High Performance Sodium Secondary Batteries Using Ionic Liquids

Optimization of the Carbon Content in Copper Phosphide–Carbon Composites for High Performance Sodium Secondary Batteries Using Ionic Liquids

Synthesis and crystal structure of the iron polyphosphide FeP4

Thermodynamic Analysis of the Cu-Sn-P Ternary System

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Synthesis and crystal structure of the iron polyphosphide FeP₄