Optical induction in K_0.5Na_0.5NbO₃ ferroelectric ceramic at low calcination temperature by sol-gel route

Abstract

K_0.5Na_0.5NbO₃ ceramic was synthesized at low calcination temperature by sol-gel route. Structural properties of ceramic were investigated by X-ray diffractometer, FESEM and FTIR spectrometer. Electro-optical properties of ceramic were investigated by UV-Vis and PL spectrometer. Dielectric nature of ceramic was studied at different frequencies and temperatures which disclosed that ceramic has maximum dielectric permittivity at 500 KHz. AC conductivity analysis shows negative temperature coefficient of resistance behavior. Leakage current was studied up to 180 V which shows low value of leakage current at room temperature. Ferroelectric nature was analyzed at different electric fields (5–20 kVcm⁻¹) at 50 Hz.

Keywords:

• Sol-gel route
• optical band gap
• photoluminescence;dielectric constant
• hysteresis loop

Acknowledgment

The author (Shammi Kumar) is thankful to Dr. Pankaj Sharma and Dr. Ragini Raj Singh from JUIT Waknaghat, Solan H.P. for their support to record the optical and photoluminescence characterization of the material.