Synthesis and the crystal structure of CeCuS2

Komatsuzaki, Satoshi; Takase, Kouichi; Smura, Catherine F.; Takahashi, Yasuhiko; Takano, Yoshiki; Sekizawa, Kazuko; Clarke, Simon J.

doi:10.1016/j.jallcom.2004.12.058

Cited by 4 publications

(4 citation statements)

References 6 publications

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“…4,5) Also, CeCuS 2 was obtained by the sulfurization and solid phase reaction between CeO 2 and Cu 2 S powders at 1273 K in CS 2 /Ar atmosphere. 6) These results indicate that the synthesis methods via solid phase reaction require high reaction temperature and time duration.…”

Section: Introductionmentioning

confidence: 97%

Synthesis of LnCuS2 (Ln=Ce, Pr, Nd, Sm, Gd, and Tb) Powder by Polymerized Complex Method and CS2 Gas Sulfurization

et al. 2010

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Rare earth copper sulfides, LnCuS 2 (Ln ¼ Ce, Pr, Nd, Sm, Gd and Tb), powders were synthesized by the following procedure: (1) Ln-Cu complex oxide was synthesized using the polymerized complex method, and (2) LnCuO 2 was sulfurized by the CS 2 gas. CS 2 gas sulfurization combined with a polymerized complex method can reduce a reaction temperature and a duration time. TG-DTA and XRD results indicated that Ln 0 -Cu polymerized complex (Ln ¼ Pr, Nd, Sm and Gd) was decomposed into Ln

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Section: Introductionmentioning

confidence: 97%

Synthesis of LnCuS2 (Ln=Ce, Pr, Nd, Sm, Gd, and Tb) Powder by Polymerized Complex Method and CS2 Gas Sulfurization

et al. 2010

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“…This mixture was ground, pelletized, and heated at 700 °C for 6 days in a dried, evacuated silica vessel with an alumina liner. Single-phase polycrystalline powders of the Cu analogue CeCu 0.8 OS were prepared on the scale of a few grams by heating a ground, pelletized mixture of CeCuS 2 , , CeO 2 (Alfa, 99.99%), and Cu (Alfa, 99.999%) in the mole ratio 1:1:0.6 at 1100 °C for 7 days. Reductive lithiation reactions on CeAg 0.8 OS and CeCu 0.8 OS were performed by reacting the compounds with a 5-fold molar excess of n -BuLi (1.6 M in hexane) under nitrogen at ambient temperature with overnight stirring.…”

Section: Methodsmentioning

confidence: 99%

Layered CeSO and LiCeSO Oxide Chalcogenides Obtained via Topotactic Oxidative and Reductive Transformations

et al. 2019

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The chemical accessibility of the CeIV oxidation state enables redox chemistry to be performed on the naturally coinage-metal-deficient phases CeM1– x SO (M = Cu, Ag). A metastable black compound with the PbFCl structure type (space group P4/nmm: a = 3.8396(1) Å, c = 6.607(4) Å, V = 97.40(6) Å3) and a composition approaching CeSO is obtained by deintercalation of Ag from CeAg0.8SO. High-resolution transmission electron microscopy reveals the presence of large defect-free regions in CeSO, but stacking faults are also evident which can be incorporated into a quantitative model to account for the severe peak anisotropy evident in all the high-resolution X-ray and neutron diffractograms of bulk CeSO samples; these suggest that a few percent of residual Ag remains. A straw-colored compound with the filled PbFCl (i.e., ZrSiCuAs- or HfCuSi2-type) structure (space group P4/nmm: a = 3.98171(1) Å, c = 8.70913(5) Å, V = 138.075(1) Å3) and a composition close to LiCeSO, but with small amounts of residual Ag, is obtained by direct reductive lithiation of CeAg0.8SO or by insertion of Li into CeSO using chemical or electrochemical means. Computation of the band structure of pure, stoichiometric CeSO predicts it to be a Ce4+ compound with the 4f-states lying approximately 1 eV above the sulfide-dominated valence band maximum. Accordingly, the effective magnetic moment per Ce ion measured in the CeSO samples is much reduced from the value found for the Ce3+-containing LiCeSO, and the residual paramagnetism corresponds to the Ce3+ ions remaining due to the presence of residual Ag, which presumably reflects the difficulty of stabilizing Ce4+ in the presence of sulfide (S2– ). Comparison of the behavior of CeCu0.8SO with that of CeAg0.8SO reveals much slower reaction kinetics associated with the Cu1– x S layers, and this enables intermediate CeCu1– x Li x SO phases to be isolated.

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“…Many researchers [12][13][14][15][16][17][18][19][20][21][22][23] have investigated the reaction of metal oxides with CS 2 to form metal sulfides via the following reaction:…”

Section: Literaturementioning

confidence: 99%

“…[6] This method has been suggested for use in nuclear fuel processing, laser applications, and thermoelectric devices. [12][13][14][15][16][17][18][19][20][21][22][23][24][25] Furthermore, CS 2 is more reducing than H 2 S and has been demonstrated as a means of refining the oxides and nitrides of Ti, V, and Sc. [26][27][28][29][30] Many investigators [12-23, 26, 30-34] have used a CS 2 bubbler to produce CS 2 gas for subsequent reactions and to limit the gas circuit for safety.…”

Section: Literaturementioning

confidence: 99%

Synthesis of Silicon Sulfide by Using CS2 Gas

Suzuki

Yashima

Kaneko

et al. 2021

Metall Mater Trans B

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Silicon sulfide (SiS2) was synthesized from Si, SiC, Si3N4, and a eutectic Al-Si liquid. An Ar-CS2 gas mixture, after bubbling through liquid CS2, was passed over pulverized Si, SiC, Si3N4, or a eutectic Al-Si alloy liquid. White, needle-shaped SiS2 was precipitated as a single phase on the colder downstream surface when Si powder in a SiO2 liner was heated over 1273 K. This deposition mechanism involves a reaction between Si and CS2 to form SiS2, with the vaporization of SiS(g) and deposition as SiS2(s) from SiS(g) and S2(g). Quartz was unaffected by the reaction gases. Notably, Si, SiC, Si3N4, and the eutectic Al-Si liquid were found to be suitable sources for SiS2 synthesis, although this was suppressed owing to Al2S3 formation on the latter.

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Synthesis and the crystal structure of CeCuS2

Cited by 4 publications

References 6 publications

Synthesis of LnCuS<SUB>2</SUB> (Ln=Ce, Pr, Nd, Sm, Gd, and Tb) Powder by Polymerized Complex Method and CS<SUB>2</SUB> Gas Sulfurization

Synthesis of LnCuS<SUB>2</SUB> (Ln=Ce, Pr, Nd, Sm, Gd, and Tb) Powder by Polymerized Complex Method and CS<SUB>2</SUB> Gas Sulfurization

Layered CeSO and LiCeSO Oxide Chalcogenides Obtained via Topotactic Oxidative and Reductive Transformations

Synthesis of Silicon Sulfide by Using CS2 Gas

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