Phase transformations in poled PZN-4.5%PT single crystal revealed by combined property measurements and high-resolution diffraction technique

W. S. Chang, L. C. Lim, P. Yang, C. S. Tu, F. T. Wang, C. T. Tseng

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The phase transformation of annealed and poled 0.955Pb (Zn 1/3Nb2/3)O3 -0.045 PbTiO3 (PZN-4.5%PT) single crystals has been studied by means of combined bulk property measurements (dielectric permittivity and thermal current density measurements) and microstructural characterization (polarized light microscope and high-resolution x-ray diffraction). Our results showed that upon heating under zero-field condition, poled PZN-4.5%PT undergoes a R-(R+ RNT +T+TNT) - (T+TNT) -C transformation sequence, where (R+RNT) and (T+TNT) denote that the rhombohedral and tetragonal phases present consist of a mixture of microscopic (R,T) and nanotwin (RNT, TNT) domains and C denotes the cubic phase. The RNT and T NT nanotwin domains were detected only in the temperature vicinity of the R-T transformation, possibly as a means to alleviate the transformation stress in the material. These nanotwin diffractions can be easily mistaken as monoclinic diffractions.

Original languageEnglish
Article number054102
JournalJournal of Applied Physics
Issue number5
Publication statusPublished - 2008
Externally publishedYes

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