Transparent polycrystalline nanoceramics consisting of triclinic Al2SiO5 kyanite and Al2O3 corundum. Issue 3 (26th October 2017)

• Record Type: Journal Article
• Authors: Gaida, Nico A.; Nishiyama, Norimasa; Masuno, Atsunobu; Schürmann, Ulrich; Giehl, Christopher; Beermann, Oliver; Ohfuji, Hiroaki; Bednarcik, Jozef; Kulik, Eleonora; Holzheid, Astrid; Irifune, Tetsuo; Kienle, Lorenz
• Is Part Of: Journal of the American Ceramic Society. Volume 101:Issue 3(2018)
• Page Start: 998
• Page End: 1003
• Publication Date: 2017-10-26
• Subjects: alumina -- aluminosilicates -- nanocomposites -- transparent ceramics; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.15281
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: Transparent polycrystalline nanoceramics consisting of triclinic Al2 SiO5 kyanite (91.4 vol%) and Al2 O3 corundum (8.6 vol%) were fabricated at 10 GPa and 1200‐1400°C. These materials were obtained by direct conversion from Al2 O3 ‐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.