Bi2Te3 filaments via extrusion and pressureless sintering of Bi2Te3-based inks

Christoph Kenel; Nicholas R. Geisendorfer; Jun Peng; Matthew A. Grayson; David C. Dunand

doi:10.1557/s43579-021-00098-w

Bi₂Te₃ filaments via extrusion and pressureless sintering of Bi₂Te₃-based inks

Christoph Kenel, Nicholas R. Geisendorfer, Jun Peng, Matthew A. Grayson, David C. Dunand^*

^*Corresponding author for this work

Research output: Contribution to journal › Letter › peer-review

1 Scopus citations

Abstract

Abstract: Inks containing sub-20 µm particles of doped bismuth telluride (n-type Bi₂Te_2.73Se_0.3 or p-type (Bi_0.5Sb_1.5)Te₃) are extruded into 330 µm diameter filaments. When solid-state sintered up to 857 K under no pressure, the filaments only partially densify, with over 20% porosity remaining. Coating the filament with TeO₂ powder, followed by hydrogen reduction to liquid Te, enables liquid phase sintering at 710 K, with rapid densification to less than 5% porosity within 1 h. Coating with a stoichiometric blend of Bi₂O₃ + 3TeO₂ powders, followed by hydrogen reduction to liquid Bi and Te, provides transient liquid phase sintering at 808 K and subsequent reaction to Bi₂Te₃, resulting in fast filament densification, to less than 5% porosity within 10 min without residual Te. Graphic abstract: [Figure not available: see fulltext.].

Original language	English (US)
Pages (from-to)	818-824
Number of pages	7
Journal	MRS Communications
Volume	11
Issue number	6
DOIs	https://doi.org/10.1557/s43579-021-00098-w
State	Published - Dec 2021

Funding

CK received funding from the Swiss National Science Foundation under grant No. 172180. NRG was supported by a NASA Space Technology Research Fellowship (NSTRF17). Filament fabrication was funded by DARPA SEED HR00111710005. The authors gratefully acknowledge Profs. R.N. Shah and J.G. Snyder for useful discussions. This work made use of NUANCE, IMSERC, and MatCI, which have received support from the SHyNE Resource (NSF ECCS-1542205) and the MRSEC program (NSF DMR-1720139).

Keywords

Coating
Extrusion
Oxide
Sintering
Thermoelectric

ASJC Scopus subject areas

General Materials Science

Access to Document

10.1557/s43579-021-00098-w

Cite this

@article{375442ecc3444425a694177ca6fa81aa,

title = "Bi2Te3 filaments via extrusion and pressureless sintering of Bi2Te3-based inks",

abstract = "Abstract: Inks containing sub-20 µm particles of doped bismuth telluride (n-type Bi2Te2.73Se0.3 or p-type (Bi0.5Sb1.5)Te3) are extruded into 330 µm diameter filaments. When solid-state sintered up to 857 K under no pressure, the filaments only partially densify, with over 20% porosity remaining. Coating the filament with TeO2 powder, followed by hydrogen reduction to liquid Te, enables liquid phase sintering at 710 K, with rapid densification to less than 5% porosity within 1 h. Coating with a stoichiometric blend of Bi2O3 + 3TeO2 powders, followed by hydrogen reduction to liquid Bi and Te, provides transient liquid phase sintering at 808 K and subsequent reaction to Bi2Te3, resulting in fast filament densification, to less than 5% porosity within 10 min without residual Te. Graphic abstract: [Figure not available: see fulltext.].",

keywords = "Coating, Extrusion, Oxide, Sintering, Thermoelectric",

author = "Christoph Kenel and Geisendorfer, {Nicholas R.} and Jun Peng and Grayson, {Matthew A.} and Dunand, {David C.}",

note = "Publisher Copyright: {\textcopyright} 2021, The Author(s), under exclusive licence to The Materials Research Society.",

year = "2021",

month = dec,

doi = "10.1557/s43579-021-00098-w",

language = "English (US)",

volume = "11",

pages = "818--824",

journal = "MRS Communications",

issn = "2159-6859",

publisher = "Cambridge University Press",

number = "6",

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TY - JOUR

T1 - Bi2Te3 filaments via extrusion and pressureless sintering of Bi2Te3-based inks

AU - Kenel, Christoph

AU - Geisendorfer, Nicholas R.

AU - Peng, Jun

AU - Grayson, Matthew A.

AU - Dunand, David C.

PY - 2021/12

Y1 - 2021/12

N2 - Abstract: Inks containing sub-20 µm particles of doped bismuth telluride (n-type Bi2Te2.73Se0.3 or p-type (Bi0.5Sb1.5)Te3) are extruded into 330 µm diameter filaments. When solid-state sintered up to 857 K under no pressure, the filaments only partially densify, with over 20% porosity remaining. Coating the filament with TeO2 powder, followed by hydrogen reduction to liquid Te, enables liquid phase sintering at 710 K, with rapid densification to less than 5% porosity within 1 h. Coating with a stoichiometric blend of Bi2O3 + 3TeO2 powders, followed by hydrogen reduction to liquid Bi and Te, provides transient liquid phase sintering at 808 K and subsequent reaction to Bi2Te3, resulting in fast filament densification, to less than 5% porosity within 10 min without residual Te. Graphic abstract: [Figure not available: see fulltext.].

AB - Abstract: Inks containing sub-20 µm particles of doped bismuth telluride (n-type Bi2Te2.73Se0.3 or p-type (Bi0.5Sb1.5)Te3) are extruded into 330 µm diameter filaments. When solid-state sintered up to 857 K under no pressure, the filaments only partially densify, with over 20% porosity remaining. Coating the filament with TeO2 powder, followed by hydrogen reduction to liquid Te, enables liquid phase sintering at 710 K, with rapid densification to less than 5% porosity within 1 h. Coating with a stoichiometric blend of Bi2O3 + 3TeO2 powders, followed by hydrogen reduction to liquid Bi and Te, provides transient liquid phase sintering at 808 K and subsequent reaction to Bi2Te3, resulting in fast filament densification, to less than 5% porosity within 10 min without residual Te. Graphic abstract: [Figure not available: see fulltext.].

KW - Coating

KW - Extrusion

KW - Oxide

KW - Sintering

KW - Thermoelectric

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