Investigation of Mn-doped sodium-potassium niobate ((K,Na)NbO₃) ceramics by EPR and impedance spectroscopic methods

Hülya KaftelenKaradeniz Technical University, Metallurgical and Materials Engineering Department, Kanuni Campus, Trabzon, TurkeyCorrespondence[email protected] [email protected]

D. Emre KanarKaradeniz Technical University, Metallurgical and Materials Engineering Department, Kanuni Campus, Trabzon, Turkey

Sergei ReppAlbert-Ludwigs Universität Freiburg, Institut für Physikalische Chemie, Freiburg, Germany

Stefan WeberAlbert-Ludwigs Universität Freiburg, Institut für Physikalische Chemie, Freiburg, Germany

Emre ErdemAlbert-Ludwigs Universität Freiburg, Institut für Physikalische Chemie, Freiburg, GermanyCorrespondence[email protected] [email protected]

ABSTRACT

The effects of Mn-doping on the conductivity and the oxidation state were investigated for (K,Na)NbO₃ ceramics with stoichiometric, and 2 mol % A-site and B-site excess compositions. From electron paramagnetic resonance (EPR) and impedance spectroscopy we found that Mn is located at the Nb-site with the oxidation state 2+ and, due to the generation of oxygen vacancies, Mn-doping reduces the conductivity in (K,Na)NbO₃ ceramics.

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Acknowledgments

H.K. thanks the Erasmus Staff Mobility program between the Karadeniz Technical University and University of Freiburg.

Funding

These studies were financially supported by DFG project ER 662-1/1.

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Investigation of Mn-doped sodium-potassium niobate ((K,Na)NbO₃) ceramics by EPR and impedance spectroscopic methods

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Investigation of Mn-doped sodium-potassium niobate ((K,Na)NbO₃) ceramics by EPR and impedance spectroscopic methods