Morphology-controlled synthesis of α-alumina microplatelets through an additive-assisted molten salt reaction

Minmin Zhang, Yunfei Chang, Nuerxida Pulati, Shantao Zhang, Yuan Sun, Jie Wu, Yingchun Liu, Bin Yang, Wenwu Cao

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5 Scopus citations


Highly dispersed α-Al2O3 microplatelets of various sizes and aspect ratios were prepared by additive-assisted molten salt synthesis. The effects of SiO2 and SiO2 + CaO additions on phase formation and morphology development of α-Al2O3 particles were investigated. Introducing additives are very effective in controlling α-Al2O3 morphology. SiO2 additive significantly enhances shape anisotropy of α-Al2O3 platelets, where a particle aspect ratio ∼23.8 was achieved, about 2.7–6.0 times higher than those of the platelets prepared without additives. When using SiO2 + CaO mixture, low concentration additive facilitates the growth of large platelets (∼9.8 µm), while increasing its content dramatically reduces the platelet size to ∼3.7 µm. These findings provide a new insight for the design and synthesis of novel advanced anisotropic microcrystals with improved quality.

Original languageEnglish (US)
Pages (from-to)182-185
Number of pages4
JournalMaterials Letters
StatePublished - Jan 1 2018

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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