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Influence of Thermal Annealings in Argon on the Structural and Thermochromic Properties of \(\mathrm{MoO}_{3}\) Thin Films

  • M. A. Arvizu
  • M. Morales-Luna
  • M. Pérez-González
  • E. Campos-Gonzalez
  • O. Zelaya-Angel
  • S. A. Tomás
Article

Abstract

The effect of thermal annealing in an inert atmosphere (argon) on the structural and thermochromic properties of \(\hbox {MoO}_{3}\) thin films was investigated. \(\hbox {MoO}_{3}\) thin films were deposited by thermal evaporation in vacuum of \(\hbox {MoO}_{3}\) powders. X-ray diffraction patterns of the films showed the presence of the monoclinic Magneli phase \(\hbox {Mo}_{9}\hbox {O}_{26}\) for annealing temperatures above \(250\,{^{\circ }}\hbox {C}\). Absorbance spectra of the films annealed in argon indicated that their thermochromic response increases with the annealing temperature in the analyzed range (23 \({^{\circ }}\hbox {C}\)–300 \({^{\circ }}\hbox {C}\)), a result opposite to the case of thermal annealings in air, for which case the thermochromic response shows a maximum value around 200 \({^{\circ }}\)C–225 \({^{\circ }}\)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.

Keywords

Color centers Magneli phases Molybdenum oxide Thermochromism Thin films Vapor deposition 

Notes

Acknowledgements

The technical assistance of E. Ayala, M. Guerrero, and A. García is acknowledged. This work was partially supported by Consejo Nacional de Ciencia y Tecnologia (CONACyT) under Projects No. 168605 and 205733.

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • M. A. Arvizu
    • 1
    • 2
  • M. Morales-Luna
    • 3
  • M. Pérez-González
    • 1
  • E. Campos-Gonzalez
    • 4
  • O. Zelaya-Angel
    • 1
  • S. A. Tomás
    • 1
  1. 1.Departamento de FísicaCentro de Investigación y de Estudios Avanzados del I.P.N., A.P. 14-740MéxicoMexico
  2. 2.Department of Engineering Sciences, The Ångström LaboratoryUppsala UniversityUppsalaSweden
  3. 3.Programa de Nanociencias y NanotecnologíaCentro de Investigación y de Estudios Avanzados del I.P.N., A.P. 14-740MéxicoMexico
  4. 4.Facultad de Química, MaterialesUniversidad Autónoma de QuerétaroQuerétaroMexico

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