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

Abstract

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.

Authors:
Publication Date:
Research Org.:
Pittsburgh Univ., PA (USA). Dept. of Physics and Astronomy
OSTI Identifier:
6050295
Report Number(s):
AD-A-204914/6/XAB
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Devaty, R P. Far- and mid-infrared properties of metal-insulator composite materials. Annual letter report, 1 January-31 December 1988. United States: N. p., 1988. Web.
Devaty, R P. Far- and mid-infrared properties of metal-insulator composite materials. Annual letter report, 1 January-31 December 1988. United States.
Devaty, R P. 1988. "Far- and mid-infrared properties of metal-insulator composite materials. Annual letter report, 1 January-31 December 1988". United States.
@article{osti_6050295,
title = {Far- and mid-infrared properties of metal-insulator composite materials. Annual letter report, 1 January-31 December 1988},
author = {Devaty, R P},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/6050295}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1988},
month = {Fri Jan 01 00:00:00 EST 1988}
}

Technical Report:
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