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Functional twin boundaries and tweed microstructures: a comparison between minerals and device materials

Published online by Cambridge University Press:  05 July 2018

Oktay Aktas and
Ekhard K. H. Salje
Oktay Aktas*
Affiliation:
Department of Earth Sciences, Cambridge University, Downing Street, Cambridge CB2 3EQ, UK
Ekhard K. H. Salje
Affiliation:
Department of Earth Sciences, Cambridge University, Downing Street, Cambridge CB2 3EQ, UK
*
* E-mail:oktay.aktas@mat.ethz.ch
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Abstract

In ferroelastic materials, the existence of degenerate strain states leads to the formation of nanoscale microstructures, such as domain boundaries (twin walls) and tweed. As the symmetry properties of microstructures differ from those of the bulk, they may dramatically change the macroscopic properties of a crystal. In addition, they are likely to have functional properties (ferroelecricity, piezoelectricity, magnetism, conductivity and rapid chemical transport) that are absent in the bulk. The existence of functional properties of twin walls, along with the advances in nano-scale characterization, has opened the door to domain boundary engineering, which aims to use domain boundaries as active elements in device materials. Hence, this relatively new field puts ferroelastic twin walls and possibly tweed at the heart of future electronic devices. Ferroelasticity is very common among minerals. Similar to manmade materials, the same crystallographic principles apply, which means that there are many minerals that await discovery for their functional properties. Thus, this review aims to raise attention to the discovery of minerals with functional microstructures. The current development of functional twin boundaries and tweed structures in physics and materials sciences is compared with the traditional observation of such structures in minerals. With an emphasis on chemical transport and piezoelectric/ ferroelectric behaviour, examples of functional microstructures are given from both man-made materials and minerals in addition to a discussion of the origin of polar twin walls and the introduction of a recent experimental technique, resonant piezoelectric spectroscopy (RPS), for their discovery.

Keywords

twin boundariestweedfunctional microstructuresmineralsferroelastics materialsresonant piezoelectric spectroscopy

Information

Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 7 , December 2014, pp. 1725 - 1741
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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Footnotes

†

Present address: Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 4, 8093 Zurich, Switzerland

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