Far- and mid-infrared properties of metal-insulator composite materials. Annual letter report, 1 January-31 December 1988

Technical Report · Fri Jan 01 00:00:00 EST 1988

OSTI ID:6050295

Devaty, R P

The infrared properties of thin Pt/Al/sub 2/O/sub 3/ granular metal-insulator composite films (cermets) were investigated using Fourier transform spectroscopy. The films were grown by dual-electron-beam evaporation onto polished single-crystal sapphire substrates. The metallic volume fraction, which was controlled by the deposition conditions, ranged from 23% to 100% in the set of samples. The percolation threshold estimate from the temperature dependence of the dc resistance is greater than 50%, which implies that the Pt particles are highly correlated. The percolation threshold for a random metal-insulator mixture is less than 20%. The transmission and relative reflection of the films were measured at room temperature using a Nicolet 740 Fourier transform infrared spectrometer (FTIR), which arrived at the beginning of the year. The mid- and near-infrared regions (400-15250 cm-1) were covered using three combinations of sources, beamsplitters, and detectors. The reflection standard was a 100% Pt film from the sample set.

• Research Organization: Pittsburgh Univ., PA (USA). Dept. of Physics and Astronomy
• OSTI ID: 6050295
• Report Number(s): AD-A-204914/6/XAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
INFRARED SPECTRA
ALUMINIUM OXIDES
BEAM SPLITTING
CERMETS
DEPOSITION
DIRECT CURRENT
ELECTRON BEAMS
EVAPORATION
FOURIER TRANSFORM SPECTROMETERS
INTERMEDIATE INFRARED RADIATION
MEDIUM TEMPERATURE
METALS
MIXTURES
MONOCRYSTALS
NEAR INFRARED RADIATION
PARTICLES
PLATINUM
PROGRESS REPORT
SAMPLING
SAPPHIRE
SUBSTRATES
THERMODYNAMIC PROPERTIES
ALUMINIUM COMPOUNDS
BEAMS
CHALCOGENIDES
CORUNDUM
CRYSTALS
CURRENTS
DISPERSIONS
DOCUMENT TYPES
ELECTRIC CURRENTS
ELECTROMAGNETIC RADIATION
ELEMENTS
INFRARED RADIATION
LEPTON BEAMS
MATERIALS
MEASURING INSTRUMENTS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTICLE BEAMS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PLATINUM METALS
RADIATIONS
SPECTRA
SPECTROMETERS
TRANSITION ELEMENTS
360603* - Materials- Properties