Preparation and Characterization of BiTaS3 a New Layered Ternary Sulfide

Oosawa, Yoshinao; Gotoh, Yoshito; Onoda, Mitsuko

doi:10.1246/cl.1989.523

Cited by 11 publications

(4 citation statements)

References 5 publications

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“…The ( M S) 1+ x (TiS 2 ) 2 ( M = Bi, Sn, Pb) powders were prepared using a solid-liquid-vapor reaction method [16,17]. For each composition, the M , S, Ti powders were mixed in the molar ratio of 1:2:5 and then sealed in an evacuated silica tube.…”

Section: Methodsmentioning

confidence: 99%

Low-Thermal-Conductivity (MS)1+x(TiS2)2 (M = Pb, Bi, Sn) Misfit Layer Compounds for Bulk Thermoelectric Materials

et al. 2010

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A series of (MS)1+x(TiS2)2 (M = Pb, Bi, Sn) misfit layer compounds are proposed as bulk thermoelectric materials. They are composed of alternating rock-salt-type MS layers and paired trigonal anti-prismatic TiS2 layers with a van der Waals gap. This naturally modulated structure shows low lattice thermal conductivity close to or even lower than the predicted minimum thermal conductivity. Measurement of sound velocities shows that the ultra-low thermal conductivity partially originates from the softening of the transverse modes of lattice wave due to weak interlayer bonding. Combined with a high power factor, the misfit layer compounds show a relatively high ZT value of 0.28~0.37 at 700 K.

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Section: Methodsmentioning

confidence: 99%

Low-Thermal-Conductivity (MS)1+x(TiS2)2 (M = Pb, Bi, Sn) Misfit Layer Compounds for Bulk Thermoelectric Materials

et al. 2010

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“…10) We prepared a powdered raw material mixture of (SnS) 1.2 (TiS 2 ) 2 by first weighting titanium (Ti; 3N, 45¯m max), tin (Sn; 4N, 63¯m max) and sulfur (S; 4N, 75¯m max) powders (all from Kojundo Chemical Laboratory Co.) and then mixing them in a mortar under an argon atmosphere. We next packed 0.5 g portions of mixed powder into quartz tubes (OD: 10 mm; ID: 8 mm; length: 20 mm) and sealed them under a vacuum of 5 © 10 ¹2 Pa. Then, while applying a centrifugal acceleration of 18,000 g (g: standard acceleration of free fall) in their vertical direction of length, we first heated the tubes at 773 K for 2 h and next held them for 2 h at the maximum temperature of 9731,123 K, whereupon we allowed them to furnace cool.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of layered TiS2-based thermoelectric elements fabricated by a centrifugal heating technique

Aoki

Wan

Ishiguro

et al. 2011

J. Ceram. Soc. Japan

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We have developed a centrifugal heating apparatus to fabricate layered TiS 2 -based thermoelectric elements, and evaluated their thermoelectric properties. We found that layered (SnS) 1.2 (TiS 2 ) 2 bulk elements with preferred crystallographic orientation can be produced within a quartz tube under a centrifugal acceleration of 1,000 g or higher and at a maximum temperature of 1,073 K or higher. With the increasing centrifugal acceleration from 1,000 to 8,000 g, the electrical conductivity of the produced specimen was almost doubled possibly because of the increased degree of crystal-axis orientation. For the specimens produced at 8,000 g, we estimated a maximum thermoelectric figure of merit, ZT, of approximately 0.2 (673 K). We have thus demonstrated that it is possible to use the centrifugal heating technique to fabricate layered TiS 2 -based thermoelectric elements directly from the powdered raw materials.

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“…16,17 EXPERIMENTAL PROCEDURES Both TiS 2 and (SnS) 1.2 (TiS 2 ) 2 were prepared using the solid-liquid-vapor reaction method. 18 For both TiS 2 and (SnS) 1.2 (TiS 2 ) 2 , the constituent elements were weighed and mixed according to the stoichiometric ratio. The mixed powder was sealed in an evacuated silica tube, which was subsequently fired in an electric furnace.…”

Section: Introductionmentioning

confidence: 99%

Intercalation: Building a Natural Superlattice for Better Thermoelectric Performance in Layered Chalcogenides

Wan

Wang

et al. 2011

Journal of Elec Materi

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A natural superlattice with composition (SnS) 1.2 (TiS 2 ) 2 , built by intercalating a SnS layer into the van der Waals gap of layered TiS 2 , has been directly observed by high-resolution transmission electron microscopy (HRTEM). The thermoelectric performance is improved in the direction parallel to the layers because the electron mobility is maintained while simultaneously suppressing phonon transport, which is attributed to softening of the transverse sound velocities due to weakened interlayer bonding. In the direction perpendicular to the layers, the lattice thermal conductivity of (SnS) 1.2 (TiS 2 ) 2 is even lower than the predicted minimum thermal conductivity, which may be caused by phonon localization due to the translational disorder of the SnS layers parallel to the layers. Moreover, we propose a large family of misfit-layer compounds (MX) 1+x (TX 2 ) n (M = Pb, Bi, Sn, Sb, rare-earth elements; T = Ti, V, Cr, Nb, Ta; X = S, Se; n = 1, 2, 3) with a natural superlattice structure as possible candidate high-performance thermoelectric materials.

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Preparation and Characterization of BiTaS3 a New Layered Ternary Sulfide

Abstract: BiTaS3, a new layered ternary sulfide, has been prepared from the elements. The X-ray diffraction pattern of the sulfide is indexed on the basis of pseudo-orthorhombic cell with the lattice parameters of a = 6.10 Å, b = 38.3 Å, and c = 23.115 Å.

Cited by 11 publications

References 5 publications

Low-Thermal-Conductivity (MS)1+x(TiS2)2 (M = Pb, Bi, Sn) Misfit Layer Compounds for Bulk Thermoelectric Materials

Low-Thermal-Conductivity (MS)1+x(TiS2)2 (M = Pb, Bi, Sn) Misfit Layer Compounds for Bulk Thermoelectric Materials

Evaluation of layered TiS2-based thermoelectric elements fabricated by a centrifugal heating technique

Intercalation: Building a Natural Superlattice for Better Thermoelectric Performance in Layered Chalcogenides

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