V. Bornand et S. Trolier-mckinstry, Structural and electrical characterization of heteroepitaxial Pb[Yb1/2Nb1/2]O-3-PbTiO3 thin films, J APPL PHYS, 87(8), 2000, pp. 3958-3964
The pulsed laser deposition process has been used to prepare heteroepitaxia
l (1-x) Pb[Yb1/2Nb1/2]O-3-xPbTiO(3) (PYbN-PT, x=0.4,0.5) thin films on sing
le crystalline (001)(pc)SrRuO3/LaAlO3 and (111)(pc)SrRuO3/SrTiO3 substrates
(the subscript pc refers here to the pseudocubic subcell). High laser freq
uencies (f-16 Hz) and 300 mTorr of background O-3/O-2 in the chamber during
deposition provide stoichiometric and high crystalline quality heterostruc
tures. Temperatures in the 560-660 degrees C range lead to improved microst
ructures as well as good dielectric and ferroelectric properties consistent
with those of PYbN-PT ceramics. In particular, films show room temperature
dielectric constants greater than 1300 and exhibit well-developed hysteres
is loops with remanent polarizations (P-r) as high as 40-50 mu C cm(-2). Re
sults are discussed in terms of film composition and crystallinity. (C) 200
0 American Institute of Physics. [S0021-8979(00)05708-X].