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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
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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