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

Ho doping 0.825K0.5Na0.5NbO3-0.175Sr(Yb0.5Nb0.5)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 Pr=9.11 μC/cm~2,while x=0.20,the maximum energy storage density Wrecreaches 0.26 J/cm~3,and the energy storage efficiency η reaches 87.1%.