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

Muhammad Asif Rafiq | Zendy; Peter Supancic | Zendy; Maria Elisabete V. Costa | Zendy; Paula M. Vilarinho | Zendy; Marco Deluca | Zendy

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

Author(s) -

Muhammad Asif Rafiq,

Peter Supancic,

Maria Elisabete V. Costa,

Paula M. Vilarinho,

Marco Deluca

Publication year - 2014

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4860416

Subject(s) - monoclinic crystal system , raman spectroscopy , phonon , materials science , ferroelectricity , raman scattering , molecular physics , condensed matter physics , crystallography , optics , chemistry , crystal structure , physics , dielectric , optoelectronics

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

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