  It has been a hot issue to search for hydrides at high pressure with high
superconducting transition temperature (Tc). In this work, ternary
hydrogen-rich compounds KYHn (n = 1-16) were studied and calculated using the
density function theory (DFT) method and he results showed that the KYH8
demonstrates good stability and superconductivity. And keep thermodynamically
stable in the pressure range of 50-300 GPa. The research found that the Tc of
KYH8-C2/m was predicted to be 111.3K, 122.0K, and 142.3K at 200, 250 and 300
GPa, respectively. Our current study provides a possibility for searching new
high-Tc superconductors in ternary hydrides.
