Accession Number:

ADA243280

Title:

New Optical Materials for the Long-Wave (8-12 Microns) Region: Design Criteria for the Solid-State Chemist

Descriptive Note:

Technical rept. Oct 1990-Sep 1991,

Corporate Author:

NAVAL WEAPONS CENTER CHINA LAKE CA

Personal Author(s):

• Vanderah, T. A.
• Lowe-Ma, C. K.

Report Date:

1991-10-01

Pagination or Media Count:

6.0

Abstract:

Certain applications that utilize long-wavelength 8-12 micron infrared LWIR windows require environmental durability and mechanical strength in addition to infrared optical transparency i.e., the window-materials must simultaneously serve as optical and structural ceramics. The fundamental requirement of optical transparency in the long-wavelength region eliminates from consideration all well-known ceramic materials such as oxides, nitrides, and other light-anion compounds, making this a particularly difficult materials problem. The structure-property relationships and chemical rationale used to guide both the screening of known compounds and the synthesis of new compounds likely to possess the desired properties rely on factors such as atomic mass, electronic configuration, coordination number, and crystal structure-type. The resulting criteria have directed our efforts in the synthesis and characterization of a number of ternary indium sulfide phases and calcium yttrium sulfide systems.

Descriptors:

• *REQUIREMENTS
• CALCIUM
• OPTICAL PROPERTIES
• OPTICS
• SYNTHESIS
• PHYSICAL PROPERTIES
• STRUCTURAL PROPERTIES
• MATERIALS
• MASS
• OPTICAL MATERIALS
• STRENGTH(MECHANICS)
• REGIONS
• NITRIDES
• PHASE
• CERAMIC MATERIALS
• OXIDES
• CONFIGURATIONS
• MOLECULAR STRUCTURE
• INFRARED RADIATION
• TERNARY COMPOUNDS
• LONG WAVELENGTHS
• INDIUM
• ATOMIC PROPERTIES
• SULFIDES
• YTTRIUM
• TRANSPARENCIES
• ELECTRONICS

Subject Categories:

• Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE