CaLa2S4: Ceramic Window Material For The 8 to 14 pm Region

William B. White; Daniel Chess; Catherine A. Chess; James V. Biggers

doi:10.1117/12.932482

26 February 1982 CaLa₂S₄: Ceramic Window Material For The 8 to 14 μm Region

William B. White, Daniel Chess, Catherine A. Chess, James V. Biggers

Proceedings Volume 0297, Emerging Optical Materials; (1982) https://doi.org/10.1117/12.932482
Event: 25th Annual Technical Symposium, 1981, San Diego, United States

Abstract

CaLa₂S₄ is a member of the family of ternary sulfides. It has the cubic Th₃P₄ structure, space group I-43d, with both cations on equivalent 8-coordinated sites. Powders prepared by firing oxides and carbonates in flowing H₂S can be processed by a combination of hot-pressing and hot-isostatic pressing into sulfide ceramics with good infrared transmission. The vibrational absorption edge is at 17 μm. The materials are resistant to attack by water. The microhardness of the nearly 100% dense ceramics is 600 kg/mm². Optical transmission of 55% (including reflection losses) at 14 μm has been achieved, but optical quality is extremely sensitive to processing conditions. Absorption and scattering are produced by residual pores, by second phase impurities on grain boundaries, by oxidation products such as sulfate and thiosulfate, and electronic defects arising from non-stoichiometry.

Citation Download Citation

William B. White, Daniel Chess, Catherine A. Chess, and James V. Biggers "CaLa₂S₄: Ceramic Window Material For The 8 to 14 μm Region", Proc. SPIE 0297, Emerging Optical Materials, (26 February 1982); https://doi.org/10.1117/12.932482

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available