Control of Volume Fraction of Non-180° Domains by Thermal Strain in Epitaxial Rhombohedral Pb(Zr, Ti)O_3 Thick Films

摘要

Epitaxial rhombohedral Pb(Zr_(0.65)Ti_(0.35))O_3 films with (100) and (110)/(10-1) and (111)/(11-1) orientations were grown on various kinds of single crystal substrates having different thermal expansion coefficient. Volume fractions of (110) and (111) orientations in respective (110)/(10-1) and (111)/(11-1)-oriented films were almost linearly increased with increasing thermal strain, ε_(thermal), applied to the films that was generated under the cooling process after the deposition from the growth temperature to the Curie temperature. Observed saturation polarization (P_(sat)) was changed linearly with the volume fractions of (110) and (111) orientations, in the same manner as the volume fractions of (001) and (101) orientations in (001)/(100) and (101)/(110) oriented tetragonal Pb(Zr, Ti)O_3 films reported previously. These results showed that the volume fraction of the non-180° domains Pb(Zr, Ti)O_3 films of both tetragonal and rhombohedral symmetries can be manipulated by ε_(thermal), which brings possibly to control the P_(sat) value.