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Transparent polycrystalline nanoceramics consisting of triclinic Al 2 SiO 5 kyanite and Al 2 O 3 corundum
Author(s) -
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
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15281
Subject(s) - kyanite , crystallite , corundum , materials science , grain size , mineralogy , triclinic crystal system , grain boundary , analytical chemistry (journal) , microstructure , crystallography , composite material , metallurgy , quartz , crystal structure , chemistry , chromatography
Transparent polycrystalline nanoceramics consisting of triclinic Al 2 SiO 5 kyanite (91.4 vol%) and Al 2 O 3 corundum (8.6 vol%) were fabricated at 10 GPa and 1200‐1400°C. These materials were obtained by direct conversion from Al 2 O 3 ‐SiO 2 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.