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Structural Characterization of Cu2+ Functional Centers In ‘Lead-Free’ KNN Piezoelectrics

Published online by Cambridge University Press:  31 January 2011

Ebru Erünal ,
Rüdiger-A. Eichel ,
Jerome Acker ,
Hans Kungl  and
Michael J. Hoffmann
Ebru Erünal
Affiliation:
ebruerunal@gmail.com
Rüdiger-A. Eichel
Affiliation:
ruediger.eichel@physchem.uni-freiburg.de, University of Freiburg, Institute of Physical Chemistry, Freiburg, Germany
Jerome Acker
Affiliation:
j.acker@ikm.uka.de, University of Karlsruhe, Institute of Ceramics in Mechanical Engineering, Karlsruhe, Germany
Hans Kungl
Affiliation:
hans.kungl@ikm.uka.de, University of Karlsruhe, Institute of Ceramics in Mechanical Engineering, Karlsruhe, Germany
Michael J. Hoffmann
Affiliation:
mjh@ikm.uni-karlsruhe.de, University of Karlsruhe, Institute of Ceramics in Mechanical Engineering, Karlsruhe, Germany
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Abstract

The alkali niobate ferroelectrics ((K0.5Na0.5)NbO3, KNN) are promising candidates as alternatives for PZT (Pb(ZrxTi(1-x))O3) ceramics in piezoelectric technologies. In order to obtain dense compounds with desirable properties, CuO has been used as sintering aid. In this work, the defect chemistry of Cu2+ doped KNN was investigated by means of electron paramagnetic resonance (EPR). Copper is found to be incorporated as acceptor-type centers on B-site in the perovskite structure and, due to charge compensation, two kinds of mutually compensating defect dipoles are formed.

Keywords

piezoelectricdefectsdopant

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1199: Symposium F –Multiferroic and Ferroelectric Materials , 2009 , 1199-F03-32
Copyright
Copyright © Materials Research Society 2010

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