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Domain wall displacement is the origin of superior permittivity and piezoelectricity in BaTiO3at intermediate grain sizes

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Ghosh, Dipankar, Sakata, Akito, Carter, Jared, Thomas, Pam A., Han, Hyuksu, Nino, Juan C. and Jones, Jacob L. (2014) Domain wall displacement is the origin of superior permittivity and piezoelectricity in BaTiO3at intermediate grain sizes. Advanced Functional Materials, 24 (7). pp. 885-896. doi:10.1002/adfm.201301913 ISSN 1616-301X.

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Official URL: http://dx.doi.org/10.1002/adfm.201301913

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Abstract

The dielectric and piezoelectric properties of ferroelectric polycrystalline materials have long been known to be strong functions of grain size and extrinsic effects such as domain wall motion. In BaTiO3, for example, it has been observed for several decades that the piezoelectric and dielectric properties are maximized at intermediate grain sizes (≈1 μm) and different theoretical models have been introduced to describe the physical origin of this effect. Here, using in situ, high-energy X-ray diffraction during application of electric fields, it is shown that 90° domain wall motion during both strong (above coercive) and weak (below coercive) electric fields is greatest at these intermediate grain sizes, correlating with the enhanced permittivity and piezoelectric properties observed in BaTiO3. This result validates the long-standing theory in attributing the size effects in polycrystalline BaTiO3 to domain wall displacement. It is now empirically established that a doubling or more in the piezoelectric and dielectric properties of polycrystalline ferroelectric materials can be achieved through domain wall displacement effects; such mechanisms are suggested for use in the design of new ferroelectric materials with enhanced properties.

Item Type: Journal Article
Subjects: Q Science > QC Physics
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Materials science, Condensed matter, Ferroelectric thin films, Piezoelectricity, Ferroelectricity
Journal or Publication Title: Advanced Functional Materials
Publisher: Wiley - V C H Verlag GmbH & Co. KGaA
ISSN: 1616-301X
Official Date: 19 February 2014
Dates:
DateEvent
19 February 2014Published
3 September 2013Available
Volume: 24
Number: 7
Page Range: pp. 885-896
DOI: 10.1002/adfm.201301913
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 20 January 2016
Date of first compliant Open Access: 20 January 2016

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