Desmelinda, E. Desmelinda and Suasmoro, S. Suasmoro X-Ray Characterization of Lead Free Ferroelectric Material (K0.4Na0.4Ba0.16Sr0.04)(Nb0.8Ti0.2)O3 Prepared by Solid State Reaction and Oxalate Coprecipitation Method. Proceeding of International Conference On Research, Implementation And Education Of Mathematics And Sciences 2015. ISSN 978-979-96880-8-8