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Zirconium nitride based transparent heat mirror coatings: preparation and characterisation
Uppsala universitet.
Uppsala Universitet.
Uppsala Universitet.
1994 (English)In: Solar Energy, ISSN 0038-092X, Vol. 32, no 2, 199-212 p.Article in journal (Refereed) Published
Abstract [en]

Transparent heat mirror coatings based on thin zirconium nitride films have been prepared using reactive magnetron sputtering. The zirconium nitride films have been sandwiched between layers of zirconium oxide. It is shown that the multilayer configuration ZrO2/ZrN/ZrO2 can be used as solar control coatings on window glazings. A visible transmittance of around 60% and a thermal emittance lower than 0.2 can be obtained, and the ratio between visible transmittance and total solar transmittance can be as high as 1.7. The influence of substrate temperature on the optical quality of the films is evaluated and it is shown that the crystal structure of the first oxide layer is of importance for the optical quality of the nitride. The influence of preparation conditions and accelerated ageing has been modelled using the optical constants of thin films prepared under identical conditions as the films in the multilayer coatings.

Place, publisher, year, edition, pages
1994. Vol. 32, no 2, 199-212 p.
National Category
Materials Engineering
Research subject
Militärteknik
Identifiers
URN: urn:nbn:se:fhs:diva-4526DOI: 10.1016/0927-0248(94)90304-2OAI: oai:DiVA.org:fhs-4526DiVA: diva2:708495
Available from: 2014-03-27 Created: 2014-03-27 Last updated: 2014-06-03Bibliographically approved
In thesis
1. Preparation and Characterisation of Sputtered Titanium- and Zirconium Nitride Optical Films
Open this publication in new window or tab >>Preparation and Characterisation of Sputtered Titanium- and Zirconium Nitride Optical Films
1993 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Multilayered interference coatings based on titanium- and zirconium nitride and designed for solar control have been prepared using reactive d c magnetron sputtering. Preparation effects and degradation mechanisms were investigated. It was shown that the quality of the nitride strongly depends on the degree of crystallinity in the underlying oxide. It has been shown that the nitride layer partly oxidizes as the top oxide layer is deposited. The degradation is enhanced with temperature. A thin sacrificial layer of aluminium deposited between successive depositions of nitride and oxide is shown to improve the optical performance of the coating as preparedm as well as after accelerated ageing tests.

The optical properties of opaque and semitransparent films of zirconium nitride have been studied. A thorough investigation of the influence of composition, deposition rate, substrate temperature and film thickness on the optical response of the film was performed. Both photometric and ellipsometric methods were used to determine thicknesses and the optical constants at wavelengths ranging from 0.23 to 25 μm. The resulting values of n and k, in the wavelength intervals where these independent methods are applicable, have been shown to agree extremely well. The results so far indicate an even larger potential for zirconium nitride based solar control coatings as compared to the titanium nitride based.

Access to optical constants derived from films of zirconium nitride of variable quality made multilayer modelling a powerful tool in the design and analysis of solar control coatings.

Place, publisher, year, edition, pages
Uppsala: Uppsala University, 1993. 31 p.
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:fhs:diva-4530 (URN)
Presentation
, Uppsala
Opponent
Supervisors
Available from: 2014-04-15 Created: 2014-03-27 Last updated: 2017-03-29Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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