Abstract
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.
Highlights
A polarized Raman analysis of ferroelectric (K0.5Na0.5)NbO3 (KNN) single crystals is presented
Ferroelectric KxNa1 xNbO3 (KNN) system is a good candidate for lead-free sensor/actuator applications, owing to its comparable properties to lead zirconate titanate (PZT)
The piezoelectric constant (d33) of doped KNN was reported to be higher than 300 pC/N, whereas with suitable texturing of the ceramic microstructure it was improved to 416 pC/N, comparable to soft PZT.1
Summary
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.
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