Amorphous piezo and pyroelectric phases of BaZr3 and SrTiO 3 can form quasiamorphous phases although neither of them have a polar crystalline polymorph. Amorphous films of SrTiO3 or BaZrO 3 (50- 200 nm thick) were deposited by radiofrequency magnetron sputtering on highly conductive Si substrates. The as-deposited amorphous films were then pulled through a temperature gradient in order to induce a strong inhomogeneous stress that could align the local bonding units. Stoichiometry of all samples was verified with X-ray photoelectron spectroscopy before and after heat treatment. These findings are the first instance of successful manipulation of local bonding units to obtain a noncrystalline inorganic solid with desired properties. Though qualitative, this method is highly reliable because the influences of electrical interferences, friction-induced electricity, and electrostriction can easily be excluded.
|Number of pages||3|
|State||Published - 4 Jun 2007|