| Summary: | Due to their low greenhouse effect and exceptional insulating properties, C<sub>4</sub>F<sub>7</sub>N-CO<sub>2</sub> gas mixtures have garnered significant attention. In particular, understanding the decomposition characteristics of C<sub>4</sub>F<sub>7</sub>N-CO<sub>2</sub> is crucial for their practical use as an eco-friendly dielectric medium. At elevated temperatures, the pyrolysis of C<sub>4</sub>F<sub>7</sub>N produces high concentrations of CFN, CF<sub>3</sub>, and C<sub>2</sub>F<sub>2</sub>, along with lower levels of C<sub>3</sub>F<sub>5</sub>, C<sub>4</sub>F<sub>6</sub>N, C<sub>2</sub>F, and CN. A further increase in temperature may lead to the decomposition of CO<sub>2</sub> into CO and additional components such as C<sub>2</sub>, C<sub>2</sub>F<sub>3</sub>, C<sub>3</sub>F<sub>4</sub>, C<sub>4</sub>F<sub>7</sub> and C<sub>3</sub>F<sub>6</sub>, CF, CO, C<sub>3</sub>F<sub>7</sub>, C<sub>3</sub>F<sub>2</sub>, C<sub>3</sub>F, C<sub>3</sub>F<sub>3</sub>, C<sub>3</sub>F<sub>3</sub>N, C<sub>3</sub>, CF<sub>2</sub>, and CF<sub>2</sub>N. Under electrical discharge conditions, the decomposition of CO<sub>2</sub> becomes more pronounced, forming products like CO, C<sub>2</sub>O, O<sub>2</sub>, C<sub>2</sub>O<sub>2</sub>, and C<sub>2</sub>O<sub>4</sub>, with up to 25 decomposition components observed. These include products originated from both C<sub>4</sub>F<sub>7</sub>N and CO<sub>2</sub> and their combinations. In ultra-high electric field intensities, only small molecules such as O<sub>2</sub>, C<sub>2</sub>, C<sub>3</sub>, and N<sub>2</sub> are detected among the decomposition products. This study aims to provide theoretical insights and valuable data to advance research into the decomposition behavior and practical engineering applications of C<sub>4</sub>F<sub>7</sub>N-CO<sub>2</sub> gas mixtures under extreme conditions.
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