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Mechanical Confinement: An Effective Way of Tuning Properties of Piezoelectric Crystals

Marsilius, Mie and Frederick, Josh and Hu, Wei and Tan, Xiaoli and Granzow, Torsten and Han, Pengdi (2012):
Mechanical Confinement: An Effective Way of Tuning Properties of Piezoelectric Crystals.
In: Advanced Functional Materials, pp. 797-802, 22, (4), ISSN 1616301X, [Online-Edition: http://dx.doi.org/10.1002/adfm.201101301],
[Article]

Abstract

Using <001>-oriented Pb(Mg1/3Nb2/3)O3–PbTiO3 ferroelectric single crystals as a model material, the impact of mechanical confinements on polarization hysteresis, coercive field, and remanent polarization of relaxor-based piezocrystals is investigated. Comparative studies are made among rhombohedral and tetragonal single crystals, as well as a polycrystalline ceramic, under uniaxial and radial compressive pre-stresses. The dramatic changes observed are interpreted in terms of the piezoelectric effect and possible phase transitions for rhombohedral crystals, and ferroelastic domain switching and the piezoelectric effect for tetragonal crystals. Under radial compressive stresses, the coercive field for the rhombohedral crystal is observed to increase to 0.67 kV/mm and that for the tetragonal crystal is increased to 0.78 kV/mm. This is a 200% increase relative to the unstressed condition. The results demonstrate a general and effective approach to overcome the drawback of low coercive fields in these relaxor-based ferroelectric crystals, which could help facilitate widespread implementation of these piezocrystals in engineering devices.

Item Type: Article
Erschienen: 2012
Creators: Marsilius, Mie and Frederick, Josh and Hu, Wei and Tan, Xiaoli and Granzow, Torsten and Han, Pengdi
Title: Mechanical Confinement: An Effective Way of Tuning Properties of Piezoelectric Crystals
Language: English
Abstract:

Using <001>-oriented Pb(Mg1/3Nb2/3)O3–PbTiO3 ferroelectric single crystals as a model material, the impact of mechanical confinements on polarization hysteresis, coercive field, and remanent polarization of relaxor-based piezocrystals is investigated. Comparative studies are made among rhombohedral and tetragonal single crystals, as well as a polycrystalline ceramic, under uniaxial and radial compressive pre-stresses. The dramatic changes observed are interpreted in terms of the piezoelectric effect and possible phase transitions for rhombohedral crystals, and ferroelastic domain switching and the piezoelectric effect for tetragonal crystals. Under radial compressive stresses, the coercive field for the rhombohedral crystal is observed to increase to 0.67 kV/mm and that for the tetragonal crystal is increased to 0.78 kV/mm. This is a 200% increase relative to the unstressed condition. The results demonstrate a general and effective approach to overcome the drawback of low coercive fields in these relaxor-based ferroelectric crystals, which could help facilitate widespread implementation of these piezocrystals in engineering devices.

Journal or Publication Title: Advanced Functional Materials
Volume: 22
Number: 4
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 03 Apr 2012 14:12
Official URL: http://dx.doi.org/10.1002/adfm.201101301
Identification Number: doi:10.1002/adfm.201101301
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