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

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Abstract

In this work, we present a unique crystal growth synthesis of χ-Al2O3 accompanied with α-Cr:Al2O3 at room temperature. Raman spectroscopy and additions of Cr2O3 are key to identifying α-Cr:Al2O3 in trace amounts by the room temperature synthesis of ruby (α-Cr:Al2O3). The presence of this phase is further confirmed with HRTEM. The raw materials are pseudoboehmite and Cr2O3 that are treated mechano-chemically for the successful synthesis of ruby and χ-Al2O3. A thermal analysis approach is provided to explain the significant temperature reduction for the complete transformation to α-Cr:Al2O3 during annealing. The α-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 °C (up to 867 °C). This material is ideal for optics, photonics, defense, energy storage and harvesting, among other strategic applications.

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

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Publication details

The article was received on 07 Mar 2018, accepted on 21 May 2018 and first published on 21 May 2018


Article type: Paper
DOI: 10.1039/C8CE00360B
Citation: CrystEngComm, 2018, Advance Article
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    Room-temperature synthesis of χ-Al2O3 and ruby (α-Cr:Al2O3)

    F. D. Cortes-Vega, W. Yang, J. Zarate-Medina, S. R. Brankovic, J. M. Herrera Ramírez and F. C. Robles Hernandez, CrystEngComm, 2018, Advance Article , DOI: 10.1039/C8CE00360B

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