Far infrared absorption in metal-insulator composites

Conference · Sun Jan 01 04:00:00 EST 1978 · AIP (Am. Inst. Phys.) Conf. Proc.; (United States)

OSTI ID:6897342

Russell, N E; Carr, G L; Tanner, D B

The absorption coefficient of composite systems, formed by compacting together small metal particles and finely ground KCl powder, has been measured at far infrared frequencies (4 to 400 cm/sup -1/). The measurements were made on particles of aluminum, prepared by inert gas evaporation, having mean diameters in the range 200 A to 1000 A and on particles of palladium, with mean diameter 2 ..mu..m. Measurements were made for metal filling factors, f, between 0.001 and 0.10. The absorption coefficient is nearly linear in concentration for small concentrations but rises more rapidly than linearly at larger values of f, indicating the onset of a metal-insulator transition. The dependence of the absorption coefficient on particle size is very weak. A theory which includes eddy current (magnetic dipole) absorption gives a fair description of the data for the largest particles but falls several orders of magnitude below the data for the smallest ones.

• Research Organization: Ohio State Univ., Columbus
• OSTI ID: 6897342
• Report Number(s): CONF-770925-
• Conference Information: Journal Name: AIP (Am. Inst. Phys.) Conf. Proc.; (United States) Journal Volume: 40
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ABSORPTION
ABSORPTIVITY
ALKALI METAL COMPOUNDS
ALUMINIUM
CHLORIDES
CHLORINE COMPOUNDS
CRYSTAL STRUCTURE
ELECTROMAGNETIC RADIATION
ELEMENTS
FAR INFRARED RADIATION
GRAIN SIZE
HALIDES
HALOGEN COMPOUNDS
INFRARED RADIATION
METALS
MICROSPHERES
MICROSTRUCTURE
OPTICAL PROPERTIES
PALLADIUM
PHYSICAL PROPERTIES
PLATINUM METALS
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
RADIATIONS
REFLECTIVITY
SIZE
SURFACE PROPERTIES
TRANSITION ELEMENTS
TRANSMISSION