Precise determination of phonon constants in lead-free monoclinic (K0.5Na0.5)NbO3 single crystals


A polarized Raman analysis of ferroelectric (K0.5Na0.5)NbO3 (KNN) single crystals is presented. The Raman modes of KNN single crystals are assigned to the monoclinic symmetry. Angular-dependent intensities of A', A", and mixed A' + A" phonons have been theoretically calculated and compared with the experimental data, allowing the precise determination of the Raman tensor coefficients for (non-leaking) modes in single-domain monoclinic KNN. This study is the basis for non-destructive assessments of domain distribution by Raman spectroscopy in KNN-based lead-free ferroelectrics. (C) 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.






Rafiq, MA; Supancic, P; Costa, ME; Vilarinho, PM; Deluca, M

nossos autores


The work was supported by the Federal Ministry for Transport, Innovation and Technology (bmvit) and Austrian Science Fund (FWF): TRP 302-N20. Collaboration within COST Action MP0904 SIMUFER was also gratefully acknowledged. The authors would like to thank DI Stefan Strobl (Materials Center Leoben Forschung GmbH) for the help in the interpretation of defocusing experiments in KNN. Dr. Katharina Resch and DI Katharina Bruckmoser (Lehrstuhl fur Werkstoffkunde und Prufung der Kunststoffe, Montanuniversitaet Leoben) are gratefully acknowledged for supporting the Raman experiments at the Department of Kunststofftechnik of the Montanuniversitaet Leoben. Muhammad Asif Rafiq, E. Costa, and P. M. Vilarinho acknowledge FEDER, QREN, COMPETE, CICECO, and FCT. Muhammad Asif Rafiq acknowledges FCT for the financial support under the scholarship, SFRH/BD/66942/2009.

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