Influence of Thermal Annealings in Argon on the Structural and Thermochromic Properties of \(\mathrm{MoO}_{3}\) Thin Films
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- 作者：M. A. Arvizu ; M. Morales-Luna ; M. Pérez-González…
- 关键词：Color centers ; Magneli phases ; Molybdenum oxide ; Thermochromism ; Thin films ; Vapor deposition
- 刊名：International Journal of Thermophysics
- 出版年：2017
- 出版时间：April 2017
- 年：2017
- 卷：38
- 期：4
- 全文大小：
- 刊物类别：Physics and Astronomy
- 刊物主题：Condensed Matter Physics; Classical Mechanics; Industrial Chemistry/Chemical Engineering; Physical Chemistry;
- 出版者：Springer US
- ISSN：1572-9567
- 卷排序：38
文摘
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.