Chemistry Reference
In-Depth Information
Figure 5.17. Optical microscopy image (1.7 mm
1.1 mm, crossed polarizers) of
a partially transformed thin film of
p
-NPNN grown on a glass substrate:
×
α
-phase
β
(left) and
-phase (right). Reprinted with permission from J. Fraxedas, J. Caro,
J. Santiso, A. Figueras, P. Gorostiza and F. Sanz,
Europhysics Letters
1999,
Vol. 48, 461-467.
ambient conditions from the original as-deposited isotropic spherulitic morphology
(
α
-phase, left) to an anisotropic fibrilar and thus rougher morphology (
β
-phase,
right).
To conclude this chapter, which has been devoted to the growth of
thick
films,
the sequence of optical microscopy images as a function of time corresponding to a
p
-NPNN/glass film is shown. The time evolution is illustrated in Fig. 5.18 revealing
the transformation in ambient conditions. The mean transformation velocity at
ambient conditions along the directions defined by the fibres is 6
4
µ
mh
−
1
.
.
0
±
0
.
