Influences of Ar Flow-Rate and Sublimation Temperature on the Sublimation Product of Analytical Reagent MoO<sub>3</sub>
In this work, the influences of the Ar flow-rate and sublimation temperature on the phase composition and morphological structure of the sublimation products of analytical reagent MoO<sub>3</sub> are investigated. The results show that the sublimation products are always composed of ther...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-06-01
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| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/30/13/2751 |
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| Summary: | In this work, the influences of the Ar flow-rate and sublimation temperature on the phase composition and morphological structure of the sublimation products of analytical reagent MoO<sub>3</sub> are investigated. The results show that the sublimation products are always composed of thermodynamically stable orthorhombic molybdenum trioxide (α-MoO<sub>3</sub>) and metastable monoclinic molybdenum trioxide (β-MoO<sub>3</sub>) under different reaction conditions, among which the proportion of β-MoO<sub>3</sub> gradually increases with the increase in Ar flow-rate and the decrease in sublimation temperature. The formation temperature of α-MoO<sub>3</sub> is mainly between 780 K and 847 K, with the particles exhibiting an obvious sheet-like morphology. This work also finds that β-MoO<sub>3</sub> is mainly generated below 500 K; however, due to the co-actions of the deposition of gaseous MoO<sub>3</sub> molecules, the adsorption of Ar molecules, and the collision effect between the different particles, the newly formed β-MoO<sub>3</sub> is more inclined to take a spherical-shaped morphology in order to maintain its lowest energy state. |
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| ISSN: | 1420-3049 |