Physics – Condensed Matter – Materials Science
Scientific paper
2002-12-12
Physics
Condensed Matter
Materials Science
19 pages, 11 figures, Review for the American Ceramics Society
Scientific paper
We review some of the current research on two of the ultra-high piezoelectric relaxors Pb(Mg1/3Nb2/3)O3 (PMN) and Pb(Zn1/3Nb2/3)O3 (PZN). The discovery of a monoclinic phase in Pb(Zr1-xTix)O3 (PZT) in 1999 by Noheda et al. forced a reassessment of the structural symmetries found near the morphotropic phase boundary in PZT, as well as in the PbTiO3 (PT) doped systems PZN-PT, and PMN-PT. All three systems are now known to have nearly identical phase diagrams that exhibit a rhombohedral-monoclinic-tetragonal structural sequence with increasing PbTiO3 concentration. The dynamical properties of these relaxors are controlled by the unique nature of the so-called polar nanoregions (PNR), which first appear at the Burns temperature Td as evidenced by the onset of diffuse scattering. That this diffuse scattering persists to temperatures below the Curie temperatures of PMN (220 K) and PZN (410 K) indicates that the phase transitions in these relaxors are very different from those observed in ordinary ferroelectrics. They also differ in this regard from what would be expected in the often-quoted model based on analogy with the random field effect.
Gehring Peter M.
Shirane Gen
No associations
LandOfFree
Structure and Dynamics of the Ferroelectric Relaxors Pb(Mg1/3Nb2/3)O3 and Pb(Zn1/3Nb2/3)O3 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Structure and Dynamics of the Ferroelectric Relaxors Pb(Mg1/3Nb2/3)O3 and Pb(Zn1/3Nb2/3)O3, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Structure and Dynamics of the Ferroelectric Relaxors Pb(Mg1/3Nb2/3)O3 and Pb(Zn1/3Nb2/3)O3 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-344395