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Journal Articles Journal of the European Ceramic Society Year : 2023

First La2O2S infrared transparent ceramics

Abstract

Lanthanum oxysulfide (La2O2S) was investigated as infrared transparent ceramic to benefit from stronger chemical bonds and superior mechanical performances to that of non-oxide benchmark infrared materials. La2O2S ceramics were processed by hot-pressing powders prepared by combustion synthesis followed by a sulfurization treatment. Powders and ceramics were characterised through various techniques (XRD, UV-Vis-IR spectroscopy, particle size analysis, SEM, Impulse Excitation Technique, microhardness and fracture toughness tests) to assess their purity, study their microstructure and determine their optical and mechanical properties. The study reports the first IR transmission spectra, Poisson’s ratio, Young’s and shear moduli and fracture toughness values of La2O2S polycrystalline ceramics. The ceramics showed transparency in the 2-11 μm range and their mechanical performances were all superior to that of commercial infrared ceramics. The best transmission (89% of the theoretical transmission) was measured at 7.3 µm for 1 mm-thick ceramics hot-pressed at 1200-1250°C.
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Embargoed file
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Year Month Jours
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Dates and versions

hal-03896170 , version 1 (15-02-2023)

Licence

Attribution - NonCommercial - CC BY 4.0

Identifiers

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Alexandre Le Coz, Guillaume Durand, Louis Cornet, Nathalie Herbert, Françis Gouttefangeas, et al.. First La2O2S infrared transparent ceramics. Journal of the European Ceramic Society, 2023, 43 (5), pp.2133-2142. ⟨10.1016/j.jeurceramsoc.2022.12.002⟩. ⟨hal-03896170⟩
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