Lately, new environmental friendly, lead-free piezoelectric materials have been developed to replace the classic lead-based materials, PZT. Presently, the family of lead-free ceramics showing the most promising piezoelectric properties is based on potassium sodium niobate (KNN). Li, Ta and Sb modified KNN, however, were reported in 2004 to exhibit properties comparable to those of PZT. These modified compositions promise to be a new generation of environmentally safer piezoelectric materials. The goal of this paper is to present some new results on the synthesis of Li, Ta and Sb modified KNN ferroelectrics. Pure KNN and modified KNN were produced by the conventional solid state synthesis. The conventional processing steps have been chosen in order to obtain reproducible high quality samples without using complex techniques such as hot pressing or special powder handling. The ceramics obtained were characterized using x-ray diffraction (PANalytical X’Pert Pro MPD) and the compositional homogeneity and purity was certified using Energy-dispersive X-ray spectroscopy EDAX and scanning electron microscope (Inspect S Phillips). Finaly, resonance measurements have been performed according to IEEE Standard of piezoelectricity.