THERMAL EVOLUTION AND DIFFUSION OF EU-IMPLANTED SRTIO3

Europium ions of 70 keV energy were implanted at room temperature in S rTiO3 single crystals with a fluence of 5 x 10(16) ions cm(-2). The da mage and the site locations of cations in the implanted layer were inv estigated by Rutherford backscattering cm spectrometry in channeling g eometry. The oxidation states of the involved atomic species along the Eu distribution profile were determined by X-ray photoemission spectr oscopy (XPS). Following the implantation a fully amorphized layer of a bout 60 nm is generated and XPS spectra reveal europium in EU(2+) and EU(3+) states. Thermal treatments performed in air at 1050 degrees C f or durations up to 12 h have efficently induced both recrystallization of the host lattice and europium diffusion. The XPS results indicate that this diffusion phenomenon can be correlated to a given oxidation state, namely Eu2+.