Transparent polycrystalline nanoceramics consisting of triclinic Al2SiO5 kyanite and Al2O3 corundum

Nico A. Gaida, Norimasa Nishiyama, Atsunobu Masuno, Ulrich Schürmann, Christopher Giehl, Oliver Beermann, Hiroaki Ohfuji, Jozef Bednarcik, Eleonora Kulik, Astrid Holzheid, Tetsuo Irifune, Lorenz Kienle

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Transparent polycrystalline nanoceramics consisting of triclinic Al2SiO5 kyanite (91.4 vol%) and Al2O3 corundum (8.6 vol%) were fabricated at 10 GPa and 1200-1400°C. These materials were obtained by direct conversion from Al2O3-SiO2 glasses fabricated using the aerodynamic levitation technique. The material obtained at 10 GPa and 1200°C shows the highest optical transparency with a real in-line transmission value of 78% at a wavelength of 645 nm and a sample-thickness of 0.8 mm. This sample shows equigranular texture with an average grain size of 34 ± 13 nm. The optical transparency increases with decreasing mean grain size of the constituent phases. The relationship between real in-line transmission and grain size is well explained by a grain-boundary scattering model based on a classical theory.

Original languageEnglish
Pages (from-to)998-1003
Number of pages6
JournalJournal of the American Ceramic Society
Issue number3
Publication statusPublished - 2018 Mar
Externally publishedYes


  • alumina
  • aluminosilicates
  • nanocomposites
  • transparent ceramics

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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