Study of monoclinic-tetragonal-cubic phase transition in Pb(Zn1/3Nb2/3)O3–0.08PbTiO3 single crystals by micro-Raman spectroscopy

Abstract

The relaxor ferroelectric Pb(Zn1/3Nb2/3)O3–0.08PbTiO3 (PZN–0.08PT) single crystal has been investigated using polarized micro-Raman scattering technique in a wide temperature range from −150 to 350 °C. Raman spectra of the crystal at temperatures lower than 90 °C show 11 modes over a frequency range of 100–1000 cm−1. There are 12 Raman active vibration modes in the monoclinic structure of relaxor ferroelectrics according to the group theory analysis. Thus the structure of PZN-0.08PT single crystal at low temperatures is confirmed as monoclinic. Two structural phase transitions in the crystal were observed when the temperature was increasing. First, the monoclinic-tetragonal (M-T) phase transition happens at 90 °C. Second, the tetragonal-cubic (T-C) phase transition takes place at 170 °C.

A Diagram of Structure Evolution of Pb(Zn_1/3Nb_2/3)O₃-9%PbTiO₃ Relaxor Ferroelectric Crystals with Excellent Piezoelectric Properties

“…One can see that the σ, R and <Ti-O> modes reveal a blue shift as well as a decrement of the peak intensity with increasing temperatures. These results are consistent well with the observations reported by Mishra et al [19] and Cheng et al [20]. The gradual shift of these modes also implies that the structure evolution of PZN-9PT is continuous rather than mutational, in agreement with the XRD results.…”

A Diagram of the Structure Evolution of Pb(Zn1/3Nb2/3) O3-9%PbTiO3 Relaxor Ferroelectric Crystals with Excellent Piezoelectric Properties

“…One can see that the σ, R, and <Ti-O> modes reveal a blue shift as well as a decrement of the peak intensity with increasing temperatures. These results are well consistent with the observations reported by Mishra et al [19] and Cheng et al [20]. The gradual shift of these modes also implies that the structure evolution of PZN-9PT is continuous rather than mutational, in agreement with the XRD results.…”

Ionic Structures of Nanobased FeCl3/[C4mim]Cl Ionic Liquids

“…Sample temperatures ranging from 298 to 343 K were controlled using a Linkam TS600 hot stage with a temperature stability of ±0.5 K. The previous study 17 using this spectrometer showed that 5 min is long enough to achieve the thermalization of the system; therefore, in this study, the temperature was held fixed for at least 5 min at each selected temperature (298 and 343 K) in order to obtain the thermalization of the system. The Raman spectra were measured in both crossed Z(XY)Z̅ (VH) and parallel Z(XY) Z̅ (VV) polarizations, where X, Y, and Z are the cubic axes.…”