Fragile Morphotropic Phase Boundary and Phase Stability in the Near-Surface Region of Relaxor Ferroelectric (1-x)Pb(Zn1/3Nb2/3)O3-xPbTiO3:  Field-Cooled Phase Diagrams
Yaojin Wang, Ding Wang, Guoliang Yuan, He Ma, Feng Xu, Jiefang Li, D. Viehland, Peter M. Gehring
We have examined the effects of field cooling on the phase diagram of the relaxor system (1-X)Pb(Zn1/3Nb2/3)O6d3-x^PbTiO3 (PZN-xPT) for compositions near the morphotropic phase boundary (MPB). High-resolution diffraction measurements using CuKαx-rays, which probe approximately equal}3 υm below the crystal surface, were made on field-cooled (FC) single crystal specimens of PZN-4.5%PT and PZN-6.5%PT under electric fields of 1 kV/cm and 2kV/cm applied along  and combined with previous neutron diffraction data, which probe the entire crystal volume, for FC PZN-8%PT [Ohwada et al., Phys. Rev. B 67, 094111 (2003)]. A comparison to the zero-field-cooled (ZFC) PZN-xPT phase diagram reveals several interesting features: (1) the short-range monoclinic phase observed in the ZFC state on the low-PT side of the MPB is replaced by a monoclinic MdA^ phase; (2) field cooling extends the tetragonal (T) phase to higher temperatures and lower-PT concentrations; (3) the orthorhombic O) phase near the MPB is replaced by a monoclinic Mc phase; (4) the vertical MPB in the ZFC phase diagram bends significantly towards the low-PT side in the FC state. These results demonstrate that both the phase stability and the nature of the MPB in PZN-PT within the near-surface regions are fragile in the presence of electric fields.
, Wang, D.
, Yuan, G.
, Ma, H.
, Xu, F.
, Li, J.
, Viehland, D.
and Gehring, P.
Fragile Morphotropic Phase Boundary and Phase Stability in the Near-Surface Region of Relaxor Ferroelectric (1-x)Pb(Zn<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3-x</sub>PbTiO<sub>3</sub>:  Field-Cooled Phase Diagrams, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=921991
(Accessed October 3, 2023)