Influences of Ho Doping on Structure, Ferroelectric, Energy Storage and Optical Properties of KNN-SYbN Transparent Ceramics

Abstract

Ho doping 0.825K_0.5Na_0.5NbO₃-0.175Sr(Yb_0.5Nb_0.5)O₃ (KNN-SYbN-x%Ho) transparent ceramics were prepared by solid-state sintering method. The structure, ferroelectric, energy storage, and optical properties of KNN-SYbN-x%Ho were explored. With the addition of Ho, under the excitation of a 980 nm laser, the ceramics exhibit up-conversion luminescence properties with wavelengths of 550 nm and 670 nm, however, the ceramics change from pseudo-cubic phase to triphase-orthorhombic phase and the light transmittance decreases. The addition of Ho significantly enhances the ferroelectric properties and the energy storage performance of KNN-SYbN-x%Ho ceramics. When x=0.15, the residual polarization P _r = 9.11 μC/cm², while x=0.20, the maximum energy storage density W _rec reaches 0.26 J/cm³, and the energy storage efficiency η reaches 87.1%.

Keywords

Ho doping / transmittance ceramics / up-conversion luminescence / ferroelectric properties / energy storage

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