Effects of Temperature and Mineralizer on In₂O₃ Crystals Synthesized by Hydrothermal Method

Abstract:

In ( OH ) ₃, InOOH and In₂O₃ crystals were synthesized by hydrothermal method, using pure water, 1mol/L KOH and 5mol/L KOH as mineralizer, the fill factor of 35%, reacted at the temperature of 200°C, 250°C and 350°C respectively, and time of 24 h. The phase transformation rule of In ( OH ) ₃, InOOH and In₂O₃ was studied in different temperatures and mineralizer, and their morphology have been analyzed. When pure water was used, temperature was 200°C , the results showed that In ( OH )₃ crystalline phase was no obvious transformation and secondary crystallization, the crystal had nonspecific morphology. While temperature was 250°C and 350°C, the In ( OH ) ₃ crystal transformed into InOOH. When 1 mol/L KOH and 5 mol/L KOH was used, temperature was 200°C , the In ( OH ) ₃ crystal had secondary crystallization. In particular, the largest-scale crystal was about 20 μm, the smallest crystal was less than 200 nm when 5 mol/L KOH was used. InOOH crystal and a small amount of In₂O₃ were obtained in 250°C. When temperature reached 350°C , the In₂O₃ with cubic bixbyite structure was obtained, exposing the faces { 001}, { 010}, { 100} and { 101}, and the length of crystal side was more than 50 μm.

• Periodical: Advanced Materials Research (Volumes 884-885)
• Pages: 287-291
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.884-885.287
• Online since: January 2014
• Authors: Wen Li Zheng, Wei Yang
• Keywords: Hydrothermal Method, In₂O₃ Crystals, Mineralizer

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