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We report synthesis, crystal structure and physical properties of a quinaryiron-arsenide fluoride KCa$_2$Fe$_4$As$_4$F$_2$. The new compound crystallizesin a body-centered tetragonal lattice (with space group $I4/mmm$, $a$ =3.8684(2) {\AA}, c = 31.007(1) {\AA}, and $Z$ = 2), which contains doubleFe$_2$As$_2$ conducting layers separated by insulating Ca$_2$F$_2$ layers. Ourmeasurements of electrical resistivity, dc magnetic susceptibility and heatcapacity demonstrate bulk superconductivity at 33 K inKCa$_2$Fe$_4$As$_4$F$_2$.

Superconductivity in KCa$_2$Fe$_4$As$_4$F$_2$ with Separate Double Fe$_2$As$_2$ Layers