Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (Suppl): 25-31.doi: 10.3866/PKU.WHXB2014Ac08

• ARTICLE • Previous Articles     Next Articles

Study of Thermal Chemical Reactio

ZHONG Jing-Rong, SHAO Lang, YU Chun-Rong, REN Yi-Ming   

  1. China Academy of Engineering Physics, Mianyang 621900, Sichuan Province, P. R. China
  • Published:2015-05-20
  • Contact: REN Yi-Ming E-mail:renyiming@caep.cn
  • Supported by:

    The project was supported by the Science and Technology Development Foundation of China Academy of Engineering Physics, China (2014B0301050).

Abstract:

We have preliminarily developed the experimental study of UF4 and its thermal chemical reaction characteristics in environmental atmospheres such as air, O2, and hydrated O2. Various analytical techniques such as micro-laser Raman spectroscopy (MLRS), X-ray photoelectron spectroscopy (XPS), and metallography were used. Based on the physical and chemical properties of UF4, we obtained the Raman and XPS spectra of different uranium compounds after heating at specific temperatures for specific times. The experimental results indicate that UF4 is stable up to 200 ℃ in various atmospheres. Raman spectra were almost unchanged. However, above 250 ℃, the surface color of UF4 changed significantly. Raman spectrum and XPS analyses showed that a variety of uranium compounds such as UO2, UO2F2, and U3O8 were formed. In this work, we calculated the apparent activation energies of the reactions of UF4 with active gases in the environment, and studied the relationship between the reaction rate and temperature in detail.

Key words: UF4, Raman spectroscopy, X-ray photoelectron spectroscopy, Chemical reaction, Environmental atmosphere

MSC2000: 

  • O641