Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/25839
Title: Micromechanical Properties and Domain Structures of PZN-PT Piezoelectric Single Crystals
Authors: WONG MENG FEI
Keywords: Mechanical properties, domain, nanoindentation, piezoelectric, PZN-PT, single crystals,
Issue Date: 18-Jan-2011
Source: WONG MENG FEI (2011-01-18). Micromechanical Properties and Domain Structures of PZN-PT Piezoelectric Single Crystals. ScholarBank@NUS Repository.
Abstract: Relaxor ferroelectric single crystals of Pb(Zn<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub>-(6-7)%PbTiO<sub>3</sub> solid solution have recently attracted considerable attention due to their superior dielectric and piezoelectric properties. This has spurred remarkable motivation to study their deformation and domain phenomena since mechanical properties directly pertain to the crystals? reliability in piezoelectric device applications. Nanoindentation and Piezoresponse Force Microscopy (PFM) revealed the effects of mechanical pop-in events on structural and domain distortion due to a surface deformed layer, produced during the crystal fabrication process. However, this layer could be removed by an additional polishing procedure to mirror finish. Overall quantitative analysis shows that the unpoled PZN-PT single crystals have an elastic modulus of ~110 ? 120 GPa, which can be better enhanced by a poling process, especially for (011)-oriented crystals. Despite better mechanical properties, the (011)-oriented crystals were more susceptible to frequency effects during Continuous Stiffness Measurement (CSM) compared with their (001)-oriented counterparts. On the other hand, domain studies suggested that the {110} planes were the domain switching planes for the PZN-PT single crystals, while the {100} planes could be special cleavage planes caused by tensile hoop stress. All these finding are of considerable importance for a better understanding of PZN-PT single crystals behaviors in piezoelectric device applications.
URI: http://scholarbank.nus.edu.sg/handle/10635/25839
Appears in Collections:Ph.D Theses (Open)

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