Effect of pH Value on Preparation of La2CuO4 Microcrystallites Synthesized by Sol-Gel Process

Yi Feng Li; Jian Feng Huang; Li Yun Cao; Jian Peng Wu

doi:10.4028/www.scientific.net/KEM.512-515.231

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 512-515Effect of pH Value on Preparation of La2CuO4...

Effect of pH Value on Preparation of La₂CuO₄ Microcrystallites Synthesized by Sol-Gel Process

Abstract:

La₂CuO₄ crystallites were prepared via a sol-gel process using lanthanum nitrate and cupric nitrate as raw materials, distilled water as solvent, citric acid as complexing agent and ammonia to control the pH value. The as-prepared La₂CuO₄ crystallites were characterized by XRD, FESEM, TEM and UV-Vis spectra. Results show that the crystallization property of La₂CuO₄ crystallites increases firstly and then decreases with increasing of the solution pH value from 1.0 to 2.5, but all of the samples exhibit single sphere-like morphology. It is found that when the solution pH value is controlled at 2.0, the grains display uniform distribution and the size ranges from 100nm to120nm after sintering at 600°C for 2 hours. The optical band gap of the as-prepared La₂CuO₄ crystallites is calculated to be 1.38eV.

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Key Engineering Materials (Volumes 512-515)

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231-234

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https://doi.org/10.4028/www.scientific.net/KEM.512-515.231

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June 2012

Authors:

Yi Feng Li, Jian Feng Huang, Li Yun Cao, Jian Peng Wu

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La₂CuO₄, pH Value, Sol-Gel Process

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