Fundamental investigations were carried out to find out the admixing influence of CF
3I to CO
2. Firstly, thermodynamic properties at 0.1MPa were derived in a temperature range of 300-30,000K for various CF
3I-concentrations
XCF3I. Secondly, from the thermodynamic properties, a temperature-reduction factor was determined as a function of the temperature for different
XCF3I. This determination led to the suggestion that admixture of CF
3I to CO
2 at
XCF3I above 0.9 can produce a rapid effect on decay in the temperature of an extinguishing arc. Finally, the principal particles present after an arc extinction were obtained in consideration of the phase transformation of iodine molecules at 0.1MPa. For instance, the principal particles proved to be CO
2, CF
4 and CO in the gaseous phase and I
2 in the solid phase for
XCF3I of 0.01-0.94.
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