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

页码：3505 / 3511

页数：7

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