Monophasic thin films of the ox
ycarbonatesBa
2-xSr
xCuO
2CO
3have been grown b
y pulsedlaser deposition on [110]-oriented Nd
GaO3 substrates for
x = 2, 1.6, 0.9, 0.4, and 0.3. As
ystematic stud
y of these films b
y X-ra
y diffraction and transmissionelectron microscop
yshows that the film orientation varies from
a-axis or[110] orientation (copper la
yersperpendicular to the substrate) to a
c-axis or [001]orientation (copper la
yers parallel to thesubstrate) as
x decreases.Sr
2CuO
2CO
3(
x = 2) is indeed
a-axis oriented, whereas for0.4 <
x < 1.6 these films have a [110] orientation, and finall
yfor
x = 1.6-1.7 the films exhibit
c-axis, [110]- and [1
![](/images/entities/onemacr.gif)
0]-oriented domains.The factors which influence the orientation ofthese films are discussed.