Optical properties of selectively absorbing r.f. sputtered NiAl2O3 composite films

T. Stephen Sathiaraj, R. Thangaraj, H. Al Sharbaty, O. P. Agnihotri

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

NiAl2O3 composite films of various compositions were deposited by planar magnetron-assisted r.f. sputtering. The films were deposited by sputtering hot-pressed NiAl2O3 targets of two different compositions. To increase the weight per cent of nickel, additional nickel pellets distributed uniformly on the target were cosputtered along with the target of known composition. Al2O3 and SiO2 were used as antireflecting coatings. The composition of nickel in the films was estimated using energy-dispersive analysis of X-rays and atomic absorption spectroscopy. A molybdenum or nickel backing layer was used as a high reflecting mirror. The optical constants were extracted from the near normal incidence reflectance (R) and transmittance (T). Optical simulations are presented of some specially adjusted spectral profiles and their experimental realization using a two-layer coating consisting of NiAl2O3 cermet film and SiO2 antireflecting film deposited onto a metallic substrate. An absorptance of 0.94 and emittance of 0.07 (at 100 °C) were obtained for a 650 Å NiAl2O3 film (fill factor, 0.61), coated with an antireflecting layer of 780 Å SiO2 or Al2O3 on a nickel-backed glass substrate, which was predicted by computer simulation studies. Films deposited on molybdenum coated nickel-plated stainless steel substrates were stable up to 500 °C in air.

Original languageEnglish
Pages (from-to)33-42
Number of pages10
JournalThin Solid Films
Volume195
Issue number1-2
DOIs
Publication statusPublished - Jan 1 1991

Fingerprint

Composite films
Nickel
Optical properties
optical properties
composite materials
nickel
Molybdenum
Chemical analysis
Sputtering
Cermet Cements
Substrates
molybdenum
sputtering
nickel steels
Atomic spectroscopy
Coatings
Optical constants
coatings
Stainless Steel
absorptance

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Sathiaraj, T. Stephen ; Thangaraj, R. ; Al Sharbaty, H. ; Agnihotri, O. P. / Optical properties of selectively absorbing r.f. sputtered NiAl2O3 composite films. In: Thin Solid Films. 1991 ; Vol. 195, No. 1-2. pp. 33-42.
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Optical properties of selectively absorbing r.f. sputtered NiAl2O3 composite films. / Sathiaraj, T. Stephen; Thangaraj, R.; Al Sharbaty, H.; Agnihotri, O. P.

In: Thin Solid Films, Vol. 195, No. 1-2, 01.01.1991, p. 33-42.

Research output: Contribution to journalArticle

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