Synthesis of nanosized α-alumina powders using hydrothermal and precipitation routes: a comparative study

Shaghayegh Ghanizadeh, Xujin Bao, Bala Vaidhyanathan, Jon Binner

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44 Citations (Scopus)


Two different synthesis methods, viz. precipitation and hydrothermal treatment, were used to synthesise ultra-fine α-alumina powders from aluminium chloride, ammonia solution and TEAH (tetraethyl ammonium hydroxide). XRD, BET surface area analysis, TEM and FEG-SEM were used to characterise the powders produced. The presence of industrial α-alumina powder as seed particles did not affect the transformation to α-alumina phase during the hydrothermal treatment at 220 °C, either in basic or acidic environments. The results obtained from the precipitation route, however, showed that the combined effect of adding α-alumina seeds and surfactants to the precursor solution could lower the transformation temperature of α-alumina from about 1200 °C for unseeded samples to about 800 °C, as well as reducing the level of agglomeration in the alumina powders. The difference in transformation temperature mainly results from the nucleation process caused by the α-alumina seeds, which enhanced the θ→α transformation kinetics. The lower level of agglomeration present in the final powders could be due to a surface modifying role of the surfactants, preventing the particles from coalescing during the synthesis process.
Original languageEnglish
Pages (from-to)1311-1319
JournalCeramics International
Issue number1B
Early online date13 Jul 2013
Publication statusPublished - Jan 2014


  • nanoparticle
  • Al2O3
  • Hydrothermal
  • precipitation


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