Formation of liquid phase and nanostructures in flash sintered ZnO

被引：13
|
作者：
Phuah, Xin Li [1 ]
Rheinheimer, Wolfgang [1 ,2 ]
Akriti [3 ]
Dou, Letian [3 ]
Wang, Haiyan [1 ,4 ]
机构：
[1] Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA
[2] Julich Res Ctr, Inst Energy & Climate Res Mat Synth & Proc IEK 1, D-52428 Julich, Germany
[3] Purdue Univ, Davidson Sch Chem Engn, W Lafayette, IN 47907 USA
[4] Purdue Univ, Sch Elect & Comp Engn, W Lafayette, IN 47907 USA
来源：
SCRIPTA MATERIALIA | 2021年 / 195卷
关键词：
Flash sintering; ZnO; Liquid phase; Nanostructures; Electromigration; GRAIN-GROWTH; THERMAL RUNAWAY; PHOTOLUMINESCENCE; MECHANISMS; DEFECTS;
D O I：
10.1016/j.scriptamat.2020.113719
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
This study presents the effects of current density limit on flash sintering and the formation of nanostructures in undoped ZnO. The combination of high electric field and low current density (1 and 2 A/cm(2)) results in the formation of hot spots and fracture as well as ZnO nanostructures in the vicinity of the hot spots. Such phenomena were not observed in the case of higher current density limit of 3 A/cm(2). A detailed microscopy analysis revealed that the growth of nanostructures initiated from liquid phase regions at the grain boundaries and within the grains. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页数：5
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