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

被引：2

作者：

Kenel, Christoph ^{[1
]}

Geisendorfer, Nicholas R. ^{[1
]}

Peng, Jun ^{[1
,2
]}

Grayson, Matthew A. ^{[2
]}

Dunand, David C. ^{[1
]}

机构：

[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

[2] Northwestern Univ, Dept Elect & Comp Engn, 2220 Campus Dr, Evanston, IL 60208 USA

来源：

MRS COMMUNICATIONS | 2021年 / 11卷 / 06期

基金：

瑞士国家科学基金会;

关键词：

Sintering; Thermoelectric; Extrusion; Coating; Oxide; BISMUTH; TE;

D O I：

10.1557/s43579-021-00098-w

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Inks containing sub-20 mu m particles of doped bismuth telluride (n-type Bi2Te2.73Se0.3 or p-type (Bi0.5Sb1.5)Te-3) are extruded into 330 mu m 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 + 3TeO(2) 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.

引用

页码：818 / 824

页数：7

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