Preparation and characterization of V2O3 micro-crystals via a one-step hydrothermal process

被引：15
作者：
Bai, Yunyu [1 ,2 ]
Jin, Ping [1 ,3 ]
Ji, Shidong [1 ]
Luo, Hongjie [1 ]
Gao, Yanfeng [1 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China
[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
[3] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki, Japan
来源：
CERAMICS INTERNATIONAL | 2013年 / 39卷 / 07期
基金：
中国国家自然科学基金;
关键词：
V2O3; Hexagonal dipyramid; Morphology; Hydrothermal; Phase transition; NANOCRYSTALS; ROUTE;
D O I：
10.1016/j.ceramint.2013.03.040
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Phase pure V2O3 micro-crystals with a hexagonal dipyratnid morphology were fabricated for the first time via a facile one-step hydrothermal method. The crystals were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). A hexagonal dipyramid structure of V2O3 enclosed by well-grown {012} facets was obtained by hydrothermally reducing VO(acac)(2) precursor with N2H4 center dot H2O at 220 degrees C for 48 h. The results indicated that V2O3 can be well crystallized up to micron size with distinguished facets by only one step hydrothermal treatment. The formation mechanism and morphology evolution for V2O3 micro-crystals were discussed. Based on our experiments, the V2O3 nuclei formed and grew by a phase transformation through a dissolution recrystallization process of VOOH, and the formation of the hexagonal dipyramids was ascribed to the specific adsorption of Hacac to the {012} facets restraining the growth in the directions normal to the {012} facets. The present work provides a facile method for preparing phase pure V2O3 micro-crystals with hexagonal dipyramid morphology, which can be used as a new powder material for ceramic fabrication. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码：7803 / 7808
页数：6
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