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<p>Lanthanum aluminate (LaAlO<sub>3</sub>) powders were synthesized via a mechanically induced molten salt method followed by heat treatment, using aluminum/lanthanum nitrates as raw materials and NaOH as a precipitant. XRD and SEM results show that the heat treatment temperature critically affects phase formation and morphology. The LaAlO<sub>3</sub> phase starts to form at 500&#xa0;°C, and pure-phase powder is obtained at 700&#xa0;°C, where the morphology changes from snowflake-like to short columnar. Temperatures above 700&#xa0;°C reduce the LaAlO<sub>3</sub> content. NaOH enhances precursor dispersion, creates a local alkaline environment, lowers the formation temperature, and enables pure-phase LaAlO<sub>3</sub> at relatively low temperatures. The process is simple, energy-efficient, and allows controllable grain morphology.</p>

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Effect of heat treatment temperature on LaAlO3 synthesis via mechanically induced molten salt method

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Bo Song,
  • Xiaoyan Liu,
  • Lin Tian,
  • Guohua Li,
  • Weijian Xiao

摘要

Lanthanum aluminate (LaAlO3) powders were synthesized via a mechanically induced molten salt method followed by heat treatment, using aluminum/lanthanum nitrates as raw materials and NaOH as a precipitant. XRD and SEM results show that the heat treatment temperature critically affects phase formation and morphology. The LaAlO3 phase starts to form at 500 °C, and pure-phase powder is obtained at 700 °C, where the morphology changes from snowflake-like to short columnar. Temperatures above 700 °C reduce the LaAlO3 content. NaOH enhances precursor dispersion, creates a local alkaline environment, lowers the formation temperature, and enables pure-phase LaAlO3 at relatively low temperatures. The process is simple, energy-efficient, and allows controllable grain morphology.