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
收藏
页码：818 / 824
页数：7
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