Thermal behavior of vanadocene

摘要

This paper reports an investigation of the thermal behavior of vanadocene (Cp_2V, where Cp=C_5H_5) between 373 and 473 K by thermogravimetry, differential thermal analysis, X-ray diffraction, infrared spectrometry and mass spectrometry. The results show that below 400 K the predominant vaporization process is the sublimation of Cp_2V. Above 403 K a solid state mechanism resulting from the breaking of the central bond of the organometallic compound prevails. Vanadocene has been proposed as a promising precursor for the chemical vapor deposition (CVD) of vanadium carbide. Previous CVD experiments have stressed the dependence between the vanadocene vaporization process and the properties of the deposited vanadium carbide. The detailed results presented here identify the nature of the vaporized species as a function of the vanadocene temperature, in the temperature range of interest for CVD. These results should provide greater insight and control of the CVD of vanadium carbide from vanadocene.