Studies on the structural and piezoelectric properties of ZnO added on Na0.47K0.47Li0.06NbO3 ceramics prepared by ceramic method using high energy ball milling
Sodium potassium niobate (KNN) based piezoceramics added with different amount of ZnO were prepared by ceramic method using high energy ball milling. The samples prepared have compositional formula Na0. 47K0.47Li0.06NbO3 + (x) ZnO (x = 0 wt%, 0.5 wt%, 1 wt%, 1.5 wt%, and 2 wt%) and sintered at 1000 °C for 2 h. The crystalline phase, microstructure, electrical properties of the samples such as dielectric constant, dielectric loss as well as a.c conductivity of the prepared samples were investigated. It was observed that the addition of ZnO to Na0.47K0.47Li0.06NbO3 ceramics enhanced the density, electrical properties as well as piezoelectric property. X-ray diffraction (XRD) confirmed a perovskite tetragonal phase in all the samples. The X-ray density was found increased and the maximum value was obtained at 1 wt% ZnO addition Polarization–electric field (P-E) loop for the samples was traced and the remnant polarization value is found to be highest at 1 wt% ZnO addition with maximum piezoelectric constant, d33 ~ 86 pC/N amongst all the samples under study. The results of the various measurements were explained in this paper.
Authors like to acknowledge L. Radhapiyari (scientist F), Defence Research and Development Organization (DRDO), New Delhi, India for piezoelectric characterization. One of the authors (H.S.D.) acknowledges thanks to Ministry of Human Resource and Development (MHRD), New Delhi for giving research fellowship.
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