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Hot‐Working of Aluminum Oxide: II, Optical Properties
Author(s) -
RHODES W. H.,
SELLERS D. J.,
VASILOS T.
Publication year - 1975
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/j.1151-2916.1975.tb18976.x
Subject(s) - materials science , equiaxed crystals , microstructure , sapphire , crystallite , texture (cosmology) , composite material , birefringence , transmittance , pole figure , optics , metallurgy , optoelectronics , laser , physics , image (mathematics) , artificial intelligence , computer science
Polycrystalline Al 2 O 3 fabricated into plates or shapes by hot‐working techniques exhibits high in‐line transmittance from 0.4 to 5.5 μm. Examination of the product by an inverse pole figure technique demonstrated a strong {0001} texture normal to the pressing direction for both equiaxed and textured microstructures. The crystallographic texture was attributed to the dominance of basal slip in deformation. A comparison of transmissivity in the 2 principal directions of a forged plate strongly suggested that a reduction of birefringence resulting from the crystallographic texture was partially responsible for the high transmissivity. The absorption coefficient at 4.5 μm was 0.15 mm ‐1 , ∼ that for sintered Al 2 O 3 and 5 times that for sapphire