Phase Transitions in PLZT Ceramics Observed by In-situ Raman Spectroscopy

doi:10.3724/SP.J.1077.2014.13374

Abstract

Abstract: The PLZT ceramics (atomic ratio Zr/Ti≈52/48, doped with small amounts of La) were prepared by conventional solid state reaction technique and identified to be pure perovskite phase by XRD. To observe the phase transition in the PLZT ceramics, the in-situ Raman spectra were measured at different temperatures. Accordingly, the variations of characteristic Raman shifts and intensities of the modes with temperatures were obtained. It is confirmed that two types of phase transitions near morphotropic phase boundary (MPB) occurred at 0℃ from rhombohedral to tetragonal and at 350℃ from tetragonal to cubic, in the temperature range from -200℃ to 600℃. What’s more, the phase transitions for rhombohedral from low. to high-temperature phases and mixed phases may take place near -150℃ and 250℃, respectively.

Key words: PLZT ferroelectric ceramics, phase transition, near morphotropic phase boundary, in-situ Raman spectroscopy

CLC Number:

TB321

ZHANG Sa, LIU Ying, LIU Yi-Xuan, CHENG Xuan, ZHANG Ying. Phase Transitions in PLZT Ceramics Observed by In-situ Raman Spectroscopy[J]. Journal of Inorganic Materials, 2014, 29(4): 399-404.

References

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