Thermolysis preparation of monoclinic phase vanadium dioxide with ultrafine particles under an inert gas atmosphere

Yin Xianglu; Zeng Zehua; Gao Rongrong; Dai Yu; Teng Aijun

doi:10.7513/j.issn.1004-7638.2022.01.001

Volume 43 Issue 1

Mar. 2022

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Yin Xianglu, Zeng Zehua, Gao Rongrong, Dai Yu, Teng Aijun. Thermolysis preparation of monoclinic phase vanadium dioxide with ultrafine particles under an inert gas atmosphere[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(1): 1-6. doi: 10.7513/j.issn.1004-7638.2022.01.001

Citation:

Yin Xianglu, Zeng Zehua, Gao Rongrong, Dai Yu, Teng Aijun. Thermolysis preparation of monoclinic phase vanadium dioxide with ultrafine particles under an inert gas atmosphere[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(1): 1-6. doi: 10.7513/j.issn.1004-7638.2022.01.001

Citation:

Yin Xianglu, Zeng Zehua, Gao Rongrong, Dai Yu, Teng Aijun. Thermolysis preparation of monoclinic phase vanadium dioxide with ultrafine particles under an inert gas atmosphere[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(1): 1-6. doi: 10.7513/j.issn.1004-7638.2022.01.001

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Thermolysis preparation of monoclinic phase vanadium dioxide with ultrafine particles under an inert gas atmosphere

doi: 10.7513/j.issn.1004-7638.2022.01.001

Ansteel Beijing Research Institute Co., Ltd., Beijing 102211, China

Received Date: 2021-12-01
Available Online: 2022-04-24
Publish Date: 2022-02-28

Abstract

Abstract

M-phase vanadium dioxide (VO₂) is a major thermally induced phase change material with a phase change temperature of 68 ℃. Due to obvious changes in physical and chemical properties before and after the phase change, M-phase VO₂ can be widely used in the fields of phase change energy saving and sensing. Based on vanadyl oxalate as precursor in this particle, monoclinic phase vanadium dioxide with ultrafine particles was directly prepared by a thermal decomposition process in an inert gas atmosphere. The influences of reaction conditions on the phase purity of the product were explored, including pyrolysis temperature, pyrolysis time and gas flow rate. Under the optimal preparation conditions, relatively pure M-phase VO₂ with ultrafine particles was prepared. The morphology and phase change properties of the products were characterized by scanning electron microscope and differential thermal analyzer. The obtained ultrafine particles in M-phase VO₂ were mainly cuboid-like micron-sized particles, with irregularly shaped nano-sized fine particles attached to the surface. The average size of micron and nano particles were respectively 5.76 μm and 177.21 nm. The phase transition temperature was about 65 ℃. The method is simple, efficient, and easy to scale up to prepare M-phase VO₂ with ultrafine particles.
- ultrafine vanadium dioxide,
- vanadyl oxalate,
- thermolysis,
- inert gas atmosphere,
- phase-change temperature

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References(21)

References

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