Low-Temperature Formation of Cubic Th3P4-type Gadolinium and Holmium Sesquisulfides

Yuan, Haibin; Kuzuya, Toshihiro; Ohta, Mitsuo; Hirai, Shinji

doi:10.2473/journalofmmij.126.450

Cited by 5 publications

(2 citation statements)

References 7 publications

(3 reference statements)

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“…Hirai et al synthesized CeS from a mixture of Ce 2 S 3 and CeH 3 as raw materials using a hot pressing method [ 27 ]. Yuan et al sintered Gd 2 S 3 and Ho 2 S 3 using discharge plasma sintering and studied their thermoelectric properties [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Yb Doping and Sintering Conditions on the Magnetocaloric and Mechanical Properties of EuS

Chen

et al. 2022

Molecules

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For this work, europium monosulfide (EuS) powders were prepared by sulfurizing Eu2O3 powder with CS2 gas. The synthesized EuS powders were sintered by SPS at temperatures in the 800–1600 °C range for 0.33–1 h at 50 MPa under vacuum conditions. The influences of Yb doping and sintering conditions on the magnetocaloric and mechanical properties of EuS were investigated systematically. An increase in sintering temperature caused the rise of lattice parameters of EuS, whereas Yb doping caused them to drop. SEM showed that the grain size of the EuS increased with sintering temperatures in the 1000–1400 °C range. Higher sintering temperatures can enlarge the magnetizability and saturation magnetization of EuS compact. On the contrary, Yb doping can weaken the magnetizability and saturation magnetization of EuS compact. All sintered polycrystalline EuS compacts had weaker thermomagnetic irreversibility and lower magnetic anisotropy.

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Section: Introductionmentioning

confidence: 99%

The Influence of Yb Doping and Sintering Conditions on the Magnetocaloric and Mechanical Properties of EuS

Chen

et al. 2022

Molecules

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“…In previous studies, the formation behavior of rare-earth sesquisulfides (Ln 2 S 3 ) synthesized via the sulfurization of their oxides [4,5] or salts [6] using CS 2 gas was examined. The preparations of Ln 2 S 3 via CS 2 gas became feasible at low temperature in comparison with the sulfurization via H 2 S gas [7].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ytterbium Sulfides by the Sulfurization and Heat Treatment

Hirai

Yuan

et al. 2015

KEM

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Single-phase ytterbium sulfides (Yb2S3 and YbS) were synthesized by sulfurization of Yb2O3 with CS2 gas and heat treatments. Four kinds of Yb2O3 powders with different particle sizes and specific surface areas were employed as starting materials. When specific surface area of Yb2O3 powder is about 50 m2/g, a new polymorphic form Yb2S3 with an orthorhombic structure could be obtained by the sulfurization at 600°C for 8 hr. Single-phase hexagonal Yb2S3 was also synthesized form former three kinds of Yb2O3 powders by sulfurization above 1000 °C for 8 hr. Subsequently, the synthesized Yb2S3 powders were heat-treated under different conditions. Upon heat treatment at 1000 °C for 3 hr in Ar/CS2 atmosphere, orthorhombic Yb2S3 phase underwent phase transition to hexagonal Yb2S3 phase. Moreover, XRD results showed that orthorhombic Yb3S4 was main phase after heat treatment at 1050°C for 8 hr under Ar atmosphere and Yb2S3 disappeared upon prolonged (12 hr) heat treatment. Single Yb3S4 phase could be obtained after treatment at 1000 °C for 3 hr, or at 1200 °C for 1 hr, under vacuum (~1.2×10-3 Pa). YbS was formed upon treatment at 1200 °C for 5 hr. Single-phase YbS with a homogeneity range of YbS1.11-1.15 could be synthesized by treatment at 1500 °C for 3 hr. PartialYb2S3 transformed to Yb3S4 at 1300 °C for 1 hr by spark plasma sintering.

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