Micro-Raman study of the microheterogeneity in the MA-MC phase transition in 0.67PbMg1/3Nb2/3O3-0.33PbTiO3 single crystal

Abstract

Polarized Raman spectroscopy has been employed to investigate the evolution of the microstructure of 0.67PbMg1/3Nb2/3O3-0.33PbTiO3 (PMN-33%PT) single crystal in the temperature range from −195 to 300 °C. The MA-MC-cubic transition sequence was observed in the microareas with MA-type (space group Cm) and MC-type (space group Pm) monoclinic structures. Interestingly, the MA-MC phase transition temperature exhibited remarkable microareal dependence due to the spatial inhomogeneity of polar nanoregions (PNRs). The MC-cubic phase transition took place at 155 °C in both microareas, which consisted well with previous reports. These results reveal that the phase transition in PMN-33%PT single crystal is closely related with the thermal dynamics of PNRs, which will be useful for understanding the microheterogeneity in this compound.

Achieving excellent energy storage performance with thermal stability in lead-free AgNbO3 ceramics

“…The intensity and position of the Raman peaks are closely related to the crystal structure, so the change in the microstructure can be reflected by the Raman vibration modes. 27,28 Raman spectra were measured to further investigate the local structure evolution of the SAN x ceramics. It can be seen that pure AgNbO 3 ceramic shows intense internal vibration modes (ν 1 , ν 2 ), bending vibration modes (ν 3 , ν 4 ) of BO 6 octahedral tilting, and stretching vibration modes (ν 5 , ν 6 ), which are typical features of the M 1 phase structure at room temperature.…”

Temperature Dependence of Electrical Properties and Phase Transition Characteristics of [001]‐Oriented Rhombohedral Mn‐0.15PIN‐0.55PMN‐0.30PT Single Crystal

“…The Raman spectra, exhibiting similar characteristics even in the high‐temperature cubic phase, did not differ qualitatively from room‐temperature rhombohedral phase except in the intensities of various modes. This can be attributed to the broadening and overlapping of modes arising from the complex B ‐site substitution in this compound . In order to determine the locations, line widths and variations in the intensity of Raman modes, the Raman spectra are decomposed into several Lorentzian‐shaped peaks as shown in the inset of Figure .…”

Origin of temperature independent piezoelectric coefficient in Pb(Mg1/3Nb2/3)O3-BaTiO3-PbTiO3 ceramics

“…Thus, a significant change of the intensity ratio was shown gradually for all the samples in the temperature range between 300 K and 200 K. Such thermal evolution has been used to determine the M-T phase transition for PMN-PT based materials in several previous reports. 9,21,22 There is a marked change that extends over a large temperature range: the first feature can be considered as a manifestation of the phase transition, and the second as a consequence of phase coexistence. Indeed, the selected Raman mode exhibits intensities that are proportional to the volume fraction of the superimposed phases.…”