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Meeting Materials Science & Technology 2019
Symposium Ceramic and Crystal Materials for Optics and Photonics
Presentation Title Manufacturing of CaLa2S4 Transparent Ceramics by Pressure-assisted Sintering Techniques
Author(s) Guillaume Roland Durand, Christophe Coureau, Philippe Adam, Xiang-Hua Zhang, Odile Merdrignac-Conanec
On-Site Speaker (Planned) Guillaume Roland Durand
Abstract Scope CaLa2S4 (CLS) is a refractory sulfide (melting point above 1810C) with the cubic Th3P4-type structure presenting high mechanical properties and erosion resistance and a wide transmission range from visible to LWIR (0.5m to 14m). These characteristics make CLS a promising alternative to commercial ZnS, ZnSe and MgF2 in the application for infrared windows. Continuous solid solutions exist between the nominally stoichiometric CaLa2S4, γ-La2S3 and the metallic La3S4. CLS powders were produced by combustion synthesis method followed by post treatment in H2S atmosphere. The control of the stoichiometry of CLS materials is thus a key parameter to achieving the foreseen optical properties. The CLS powders were sintered by various densification methods such as Hot Pressing (HP), natural sintering, Hot Isostatic Pressing (HIP)… The phase composition, the stoichiometry and the microstructure of sintered materials were characterized and compared in order to investigate the relationship between sintering techniques and optical properties.


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