Microstructure observation of Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals by scanning electron microscopy

Piezoelectric Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) single crystals (SCs) prepared by the Bridgman method on plates of 0.3 mm thickness were polarized by six different poling methods and their piezoelectric properties were analyzed. The sine wave AC-poled PMN-PT SC showed the best properties: a piezoelec...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2023-11, Vol.62 (SM), p.SM1029
Main Authors: Xiang, Yu, Sun, Yiqin, Yamashita, Yohachi (John), Karaki, Tomoaki, Maiwa, Hiroshi
Format: Article
Language:English
Subjects:
AC poling
Bridgman method
Compressive properties
Crystal growth
ferroeledric material
Fracture surfaces
Lead titanates
Microstructure
piezoelectric material
Piezoelectricity
Plates
Scanning electron microscopy
Sine waves
Single crystals
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Summary:Piezoelectric Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) single crystals (SCs) prepared by the Bridgman method on plates of 0.3 mm thickness were polarized by six different poling methods and their piezoelectric properties were analyzed. The sine wave AC-poled PMN-PT SC showed the best properties: a piezoelectric constant d33 of 1920 pC N−1 and a free dielectric permittivity of 8050 without any spurious mode vibration. The plates were then broken to observe their microstructures by scanning electron microscopy. Clearly different vertical stripe and horizontal stripe microstructures were observed in the vertical direction of SCs. The differences in SC microstructures on the fracture surface were found to depend on the direction in which compressive and tensile stresses were applied. These results suggest that special attention should be paid when discussing the correlation between piezoelectric properties and SC microstructure, since the structure of piezoelectric SCs can vary depending on the sample geometry and pretreatment method.
ISSN:0021-4922
1347-4065
DOI:10.35848/1347-4065/acf476