In general, the tantalum films directly deposited on Si and SiO substrates in the pure Ar plasma are of high resistivity metastable tetragonal phase (b-Ta) w3–8x.However, the Ta thin film with a phase is more desirable because its smaller resistivity (typically 30 mV cm),compared with that of b-Ta and Ta-based films (more than 200 mV cm), and its compressive stress w8x.In the recent years, people have been searching harder for the