ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 21    No. 10    October 2011

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In-situ Raman observation on crack tips of Vickers indent in PLZT ceramics
ZHANG Sa, CHENG Xuan, ZHANG Ying
(College of Materials, Fujian Key Laboratory of Advanced Materials,
Xiamen University, Xiamen 361005, China
)
Abstract: Vickers indentation was introduced into the originally in-plane and out-of-plane poled PLZT ceramics. The Raman spectra were in-situ recorded at selected crack tips before and after the indentations, as well as after the applications of external electric field. The results show that the changes in Raman intensities of optical modes could be sensitively related to 90° domain switching around the crack tips which are strongly dependent on the directions of original polarization and geometric locations. When the direction of electric field was perpendicular to the direction of original polarization, the 90° domain switching at crack tips of the Vickers indentation on the originally in-plane poled PLZT ceramics caused most significant change in the Raman intensity, which inhibited the crack growth. However, when the direction of electric field was parallel to the direction of original polarization, the growth of crack tips became predominantly without the 90° domain switching, which led to the crack growth.
Key words: ferroelectric ceramics; domain switching; in-situ Raman spectroscopy; Vickers indentation
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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