July: Neamul Khansur and John Daniels, "Core-shell microstructure engineering for lead-free piezoelectrics"

July: Neamul Khansur and John Daniels, "Core-shell microstructure engineering for lead-free piezoelectrics"

Enhanced extrinsic domain switching strain in core-shell structured BaTiO3-KNbO3 ceramics.

Neamul H. Khansur 1, Hideto Kawashima 2, Satoshi Wada 2, Jessica M. Hudspeth 3, John Daniels 1

1  School of Materials Science and Engineering, UNSW Australia, NSW 2052, Australia
2  Interdisciplinary Graduate School of Medical and Engineering, University of Yamanashi, Kofu, Yamanashi 400-8510, Japan
3  European Synchrotron Radiation Facility, 6 rue Jules Horowitz, BP 220, F-38043 Grenoble Cedex, France

Piezoelectric materials are an important class of functional materials, and are an integral part in the development of innovative and high-performance devices for a range of technologies, including automation, micromanipulation, ultra-precise positioning, and medical technology. However, applications of piezoelectric materials are dominated by compositions of lead-based Pb(Zr,Ti)O3. The commercial manufacture and application of PZT materials has become a serious concern from the view point of environmental protection and health, therefore, new high-performance lead-free compositions are required. A detail understanding of structure-property relationships at multiple length scales, especially during the actuation condition is critical to improve electro-mechanical properties in existing compositions as well as to design new lead-free piezoelectrics.

In this work, a microstructurally engineered BaTiO3-KNbO3 ceramic was processed, enhancing the accessibility of large reversible strains.  This method may be expanded to many compositions and provide a unique mechanism for the design of future piezoelectric materials.

To read the full article, click here.


Image:  
Core–shell structure in BT–KN. TEM and EDS mapping images show that K and Nb exist in the shell region.