Room-temperature synthesis of χ-Al2O3 and ruby (α-Cr:Al2O3)

被引：9
|
作者：
Cortes-Vega, Fernando D. [1 ,2 ]
Yang, Wenli [3 ]
Zarate-Medina, J. [2 ]
Brankovic, Stanko R. [3 ]
Herrera Ramirez, Jose M. [4 ]
Hernandez, Francisco C. Robles [1 ,3 ,5 ]
机构：
[1] Univ Houston, Dept Mech Engn Technol, Houston, TX 77004 USA
[2] Univ Michoacana, Inst Invest Metal & Mat, Morelia, Michoacan, Mexico
[3] Univ Houston, Dept Elect & Comp Engn, Houston, TX 77004 USA
[4] CIMAV, Ctr Invest Mat Avanzados, Chihuahua, Mexico
[5] Univ Houston, Dept Mat Sci & Engn, Houston, TX 77004 USA
来源：
CRYSTENGCOMM | 2018年 / 20卷 / 25期
基金：
美国国家科学基金会;
关键词：
MILLING-INDUCED CRYSTALLIZATION; HIGH-PRESSURE; ALUMINA; LUMINESCENCE; TRANSITION; STRESS; CR3+; SIZE;
D O I：
10.1039/c8ce00360b
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
In this work, we present a unique crystal growth synthesis of chi-Al2O3 accompanied with alpha-Cr:Al2O3 at room temperature. Raman spectroscopy and additions of Cr2O3 are key to identifying alpha-Cr:Al2O3 in trace amounts by the room temperature synthesis of ruby (alpha-Cr: Al2O3). The presence of this phase is further confirmed with HRTEM. The raw materials are pseudoboehmite and Cr2O3 that are treated mechanochemically for the successful synthesis of ruby and chi-Al2O3. A thermal analysis approach is provided to explain the significant temperature reduction for the complete transformation to alpha-Cr:Al2O3 during annealing. The alpha-Cr:Al2O3 synthesized at room temperature acts as the seed or hetero site for nucleation and is responsible for a temperature drop of approximately 200 degrees C (up to 867 degrees C). This material is ideal for optics, photonics, defense, energy storage and harvesting, among other strategic applications.
引用
收藏
页码：3505 / 3511
页数：7
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