Volume 20, Issue 18 2308047
Research Article

Low-temperature Ruby Crystal Growth Via a Supersaturation Process Based on Flux Decomposition

Shunsuke Ayuzawa

Shunsuke Ayuzawa

Nagano Prefecture Nanshin Institute of Technology, 8304-190 Minamiminowa, Nagano, 399-4511 Japan

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Tetsuya Yamada

Tetsuya Yamada

Department of Materials Chemistry, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano, 380-8553 Japan

Research Initiative for Supra-Materials, Shinshu University, 4-17-1 Wakasato, Nagano, 380-8553 Japan

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Hiroh Miyagawa

Hiroh Miyagawa

Department of Materials Chemistry, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano, 380-8553 Japan

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Shuji Oishi

Shuji Oishi

Nagano Prefecture Nanshin Institute of Technology, 8304-190 Minamiminowa, Nagano, 399-4511 Japan

Department of Materials Chemistry, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano, 380-8553 Japan

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Katsuya Teshima

Corresponding Author

Katsuya Teshima

Nagano Prefecture Nanshin Institute of Technology, 8304-190 Minamiminowa, Nagano, 399-4511 Japan

Department of Materials Chemistry, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano, 380-8553 Japan

Research Initiative for Supra-Materials, Shinshu University, 4-17-1 Wakasato, Nagano, 380-8553 Japan

Research Center for Space System Innovation, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510 Japan

E-mail: [email protected]

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First published: 02 January 2024

Abstract

Crystal growth methods that do not require high temperatures are highly needed for the facile growth of oxide single crystals with melting points of several thousand degrees Celsius. This paper represents the first report of a method for the low-temperature growth of ruby crystals (chromium-doped Al2O3) at 750 °C, which is one-third of the conventionally required temperature (2050 °C). In solution-based crystal growth, the target crystal is grown at a temperature considerably lower than its melting point. However, conventional crystal growth processes involving solvent evaporation and cooling require high temperatures to completely liquefy the material, with previously reported solution growth temperatures of ≈1100 °C. Supersaturation based on the decomposition of crystal–solvent intermediates eliminates the need to completely liquefy the material, enabling low-temperature crystal growth. The combination of computational and experimental investigations helps determine the optimum conditions for low-temperature crystal growth. The proposed method is a novel green process that breaks the conventional frontiers of crystal growth while ensuring eco-friendliness and low energy consumption. In addition, its scope can potentially be expanded to the synthesis of various crystals and direct growth on substrates with low melting points.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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