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Optical and Mechanical Properties of Hot‐Pressed Cesium Iodide
Author(s) -
Kim HyounEe,
Moorhead Arthur J.
Publication year - 1990
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.1151-2916.1990.tb06544.x
Subject(s) - materials science , recrystallization (geology) , grain size , transmittance , crystallite , grain growth , composite material , flexural strength , hot pressing , dislocation , single crystal , metallurgy , optoelectronics , crystallography , chemistry , paleontology , biology
Polycrystalline CsI disks were fabricated by hot‐pressing in a nitrogen‐purged glove box. Densification during hotpressing occurred by plastic flow resulting from lattice dislocation glide. Primary recrystallization and extensive grain growth were observed. Both the optical and mechanical properties of this material were significantly affected by grain growth, but in opposite ways. Transmittance increased and strength decreased as grain size increased. The hot‐pressed CsI had transmittance of about 85% in the extra‐long‐wavelength infrared range, a value equivalent to that of single‐crystal CsI. The flexural strength of the CsI that was hot‐pressed under conditions that minimized grain growth was about 8 times higher than that of single‐crystal CsI.