The kinetics of oxidation of zirconium iodide in an air-argon mixture at high temperatures

The thermogravimetric method is used to investigate the kinetics of oxidation of zirconium iodide in an air-argon mixture in the temperature range from $1380$ to $1968$ K. The high-frequency induction heating is used to attain high temperatures. The temperature is measured by a precision optical monochromatic pyrometer using a black-body model located in the sample being investigated. The increment of sample mass is measured continuously using a spring balance. One sample is investigated, whose temperature is successively increased in jumps with stops on isotherms. The transition of tetragonal modification of oxide film to a mixture of tetragonal and cubic modifications is registered at $1745$ K. The obtained results are used to calculate the Arrhenius equation for tetragonal modification of oxide film in the range from $1380$ to $1730$ K. The activation energy is $180.7$ kJ/mol. The obtained results are compared to available literature data.