Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/16831
Title: High-resolution X-ray Diffraction Study of Phase and Domain Structures and Thermally-Induced Phase Transformations in PZN-(4.5-9)%PT
Authors: CHANG WEI SEA
Keywords: synchrotron diffraction, relaxor-ferroelectric single crystal, phase transformation, micro/nanotwin domains, morphotropic phase boundary, PZN-PT PZNPT
Issue Date: 13-Jul-2009
Citation: CHANG WEI SEA (2009-07-13). High-resolution X-ray Diffraction Study of Phase and Domain Structures and Thermally-Induced Phase Transformations in PZN-(4.5-9)%PT. ScholarBank@NUS Repository.
Abstract: High-resolution synchrotron x-ray diffraction (HR-XRD) (002)pc reciprocal space mappings have been performed on unpoled (annealed) relaxor ferroelectric PZN-(4.5-9)percentPT single crystals. To avoid undesired surface effects produced by mechanical polishing, a fracturing technique has been devised to expose the relatively stress free crystal bulk for the HR-XRD study. Evidence for rhombohedral and tetragonal micro/nanotwins could be detected in the crystals. For PZN-4.5percentPT, the room temperature rhombohedral phase exhibits a broad diffraction in most instances, although microtwin diffractions could be detected in a few cases. The increased growth-and-transformation stresses in PZN-(6-8)percentPT promote the coexistence of rhombohedral and tetragonal micro/nanotwins at room temperature. The tetragonal phase in this case is metastable stabilized by the transformation-cum-cooling stress in the crystals. This accounts for the missing (001)T diffractions in the (001)-fractured surface. At room temperature, PZN-9percentPT consists predominantly of (110)-tetragonal micro/nanotwins. The effects of temperature on the phase stability of this material are also discussed.
URI: http://scholarbank.nus.edu.sg/handle/10635/16831
Appears in Collections:Ph.D Theses (Open)

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
01-04 chap.pdf6.47 MBAdobe PDF

OPEN

NoneView/Download
05_Part1 chap.pdf5.12 MBAdobe PDF

OPEN

NoneView/Download
05_Part2 chap.pdf4.29 MBAdobe PDF

OPEN

NoneView/Download
05_Part3 chap.pdf2.22 MBAdobe PDF

OPEN

NoneView/Download
06 chap.pdf5.92 MBAdobe PDF

OPEN

NoneView/Download
07 chap.pdf2.99 MBAdobe PDF

OPEN

NoneView/Download
08_Part1 Chap.pdf4.01 MBAdobe PDF

OPEN

NoneView/Download
08_Part2_Chap.pdf9.55 MBAdobe PDF

OPEN

NoneView/Download
09_Part1 chap.pdf4.42 MBAdobe PDF

OPEN

NoneView/Download
09_Part2 chap.pdf1.48 MBAdobe PDF

OPEN

NoneView/Download
10-11 Chap.pdf102.34 kBAdobe PDF

OPEN

NoneView/Download

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.