[en] This paper reports the formation processes of crystalline Sn nanostructured films grown under ultra high vacuum conditions on monocrystalline yttria-stabilized zirconia (YSZ) substrates with (1 0 0) orientation. The microstructure of the films was analyzed using SEM and X-ray diffraction. Evaporation of Sn films yields crystallographically well-defined metallic islands of different shapes depending on the substrate temperature. The overall growth mechanism appears to follow the Stranski-Krastanov type. Irradiation of deposited films was performed at room temperature with 4 MeV Au²⁺ ions at a fluence of 10¹⁵ cm^-2 to induce material decomposition and aggregation of host atoms. X-ray diffraction and Rutherford backscattering spectrometry (RBS) experiments conducted on Sn films deposited on YSZ(1 0 0) prior to and after irradiation demonstrate that ion irradiation drives a structural phase transformation for Sn and Zr-rich compositions. The microstructural evolution upon ion irradiation was also examined by cross-sectional transmission electron microscopy (TEM)