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Influence of Thermal Annealings in Argon on the Structural and Thermochromic Properties of MoO3 Thin Films
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Ctr Invest & Estudios Avanzados IPN, Dept Fis, AP 14740, Mexico City 07360, DF, Mexico.
Ctr Invest & Estudios Avanzados IPN, Programa Nanociencias & Nanotecnol, AP 14740, Mexico City 07360, DF, Mexico..
Ctr Invest & Estudios Avanzados IPN, Dept Fis, AP 14740, Mexico City 07360, DF, Mexico..
Univ Autonoma Queretaro, Fac Quim Mat, Queretaro, Mexico..
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2017 (English)In: International journal of thermophysics, ISSN 0195-928X, E-ISSN 1572-9567, Vol. 38, no 4, 51Article in journal (Refereed) Published
Abstract [en]

The effect of thermal annealing in an inert atmosphere (argon) on the structural and thermochromic properties of MoO3 thin films was investigated. MoO3 thin films were deposited by thermal evaporation in vacuum of MoO3 powders. X-ray diffraction patterns of the films showed the presence of the monoclinic Magneli phase Mo9O26 for annealing temperatures above 250 degrees C. Absorbance spectra of the films annealed in argon indicated that their thermochromic response increases with the annealing temperature in the analyzed range (23 degrees C-300 degrees C), a result opposite to the case of thermal annealings in air, for which case the thermochromic response shows a maximum value around 200 degrees C-225 degrees C and decreases for higher temperatures. These results are explained in terms of a higher density of oxygen vacancies formed upon thermal treatments in inert atmospheres.

Place, publisher, year, edition, pages
2017. Vol. 38, no 4, 51
Keyword [en]
Color centers, Magneli phases, Molybdenum oxide, Thermochromism, Thin films, Vapor deposition
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-321424DOI: 10.1007/s10765-017-2190-1ISI: 000396130700005OAI: oai:DiVA.org:uu-321424DiVA: diva2:1095832
Available from: 2017-05-16 Created: 2017-05-16 Last updated: 2017-05-16Bibliographically approved

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