Optical properties of some metal-insulator composites
Thesis/Dissertation
·
OSTI ID:6814759
Ni-MgO granular composites were prepared by coprecipitation of NiO-MgO solid solutions and their preferential reduction in a hydrogen atmosphere. Measured reflection spectra of the composites were better described by the Effective Medium Approximation (EMA) than by the Maxwell-Garnett Theory (MGT). The conductivities and the dielectric constants were derived by a Kramers-Kronig transformation, and they showed a qualitative agreement with the EMA. In the far-infrared region, the percolation transition was observed in the reflection spectra, and also seen in the derived conductivities and the dielectric constants. The far-infrared absorption of Ag-smoke - teflon composites was studied. Because of the high resistivity of the oxide layer, the far-infrared electric dipole absorption was enhanced by three of four orders of magnitude, and it became comparable to the magnetic dipole absorption. The effects of the oxide coating on the infrared and visible absorption of silver smoke were also studied using Ag-smoke - KBr composites. In the infrared and visible region, the complete Mie theory gave better descriptions of the experimental results than the MGT. Comparison of the experimental data and the Mie calculation showed that the oxide coating on the particles did not strongly affect the extinction coefficient of the Ag-smoke - KBr composite in the near-infrared and visible range.
- Research Organization:
- Ohio State Univ., Columbus (USA)
- OSTI ID:
- 6814759
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ABSORPTION SPECTRA
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COMPOSITE MATERIALS
ELECTROMAGNETIC RADIATION
ELEMENTS
FAR INFRARED RADIATION
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
INFRARED RADIATION
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
METALS
NICKEL
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
PLASTICS
POLYETHYLENES
POLYMERS
POLYOLEFINS
POLYTETRAFLUOROETHYLENE
RADIATIONS
SILVER
SPECTRA
SYNTHETIC MATERIALS
TEFLON
TRANSITION ELEMENTS
VISIBLE RADIATION
360603* -- Materials-- Properties
ABSORPTION SPECTRA
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COMPOSITE MATERIALS
ELECTROMAGNETIC RADIATION
ELEMENTS
FAR INFRARED RADIATION
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
INFRARED RADIATION
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
METALS
NICKEL
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
PLASTICS
POLYETHYLENES
POLYMERS
POLYOLEFINS
POLYTETRAFLUOROETHYLENE
RADIATIONS
SILVER
SPECTRA
SYNTHETIC MATERIALS
TEFLON
TRANSITION ELEMENTS
VISIBLE RADIATION