Infrared properties of Pt/Al sup 2 O sup 3 cermet films
The room temperature transmittance and front reflectance of mid- and near-infrared radiation by thin Pt/AI2O3 cermet films prepared by electron beam evaporation onto sapphire substrates were measured using a Fourier transform spectrometer. The high value of the dc percolation threshold for the Pt.AI2O3 system is evidence for correlations in the positions of the particles that can be described by coated-grain topologies. The data were compared with the predictions of five effective medium models, which feature different microstructural topologies. Effective medium theories are commonly used to model the optical properties of granular composite materials such as cermet films. If one considers a two-component metal-insulator composite material over the complete range of composition, a characteristic parameter relevant to both the electrical and optical properties is the percolation threshold.
- Research Organization:
- Pittsburgh Univ., PA (United States). Dept. of Physics and Astronomy
- OSTI ID:
- 5470878
- Report Number(s):
- AD-A-234278/0/XAB; CNN: N00014-85-K-0808
- Resource Relation:
- Other Information: Prepared in cooperation with General Motors Research Lab., Warren, MI., Electrical and Electronics Engineering Dept
- Country of Publication:
- United States
- Language:
- English
Similar Records
Infrared properties of thin Pt/Al sup 2 O sup 3 granular metal-insulator composite films
Evaluation of vacuum deposition-sputter deposited cermet selective absorber coatings. Final report, January 15, 1980-November 30, 1982
Related Subjects
ALUMINIUM OXIDES
OPTICAL PROPERTIES
PLATINUM ALLOYS
AMBIENT TEMPERATURE
CERAMICS
CERMETS
COMPARATIVE EVALUATIONS
COMPOSITE MATERIALS
DIRECT CURRENT
ELECTRICAL PROPERTIES
ELECTRON BEAMS
EVAPORATION
FILMS
FOURIER TRANSFORMATION
INFRARED RADIATION
METALS
MICROSTRUCTURE
NEAR INFRARED RADIATION
PARTICLES
SAPPHIRE
SUBSTRATES
THIN FILMS
TOPOLOGY
ALLOYS
ALUMINIUM COMPOUNDS
BEAMS
CHALCOGENIDES
CORUNDUM
CRYSTAL STRUCTURE
CURRENTS
ELECTRIC CURRENTS
ELECTROMAGNETIC RADIATION
ELEMENTS
EVALUATION
INTEGRAL TRANSFORMATIONS
LEPTON BEAMS
MATERIALS
MATHEMATICS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTICLE BEAMS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PLATINUM METAL ALLOYS
RADIATIONS
TRANSFORMATIONS
360204* - Ceramics
Cermets
& Refractories- Physical Properties