Virginia Tech. Department of Materials Science and EngineeringArgonne National LaboratoryShandong University. School of Physics. State Key Laboratory of Crystal MaterialsGe, WenweiRen, YangZhang, JialiangDevreugd, Christopher P.Li, JiefangViehland, Dwight D.2015-05-212015-05-212012-05-15Ge, Wenwei, Ren, Yang, Zhang, Jialiang, Devreugd, Christopher P., Li, Jiefang, Viehland, D. (2012). A monoclinic-tetragonal ferroelectric phase transition in lead-free (K0.5Na0.5)NbO3-x%LiNbO3 solid solution. Journal of Applied Physics, 111(10). doi: 10.1063/1.47160270021-8979http://hdl.handle.net/10919/52462A monoclinic ferroelectric phase with space group Pm has been discovered in lead-free (K0.5Na0.5)NbO3-5%LiNbO3 solid solution ceramics by high energy synchrotron x-ray powder diffraction measurements. At ambient temperature, the lattice parameters of this monoclinic structure were (a(m), b(m), c(m); beta) = (4.015 angstrom, 3.944 angstrom, 3.987 angstrom; 90.34 degrees). This monoclinic phase transformed to a tetragonal (P4mm) one on heating between 340 K and 360K. The results demonstrate the presence of structurally bridging low symmetry monoclinic phase in (K0.5Na0.5)NbO3-x%LiNbO3 solid solution system: indicating a means to achieve high piezoelectricity in Pb-free systems via domain engineering. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4716027]7 pagesapplication/pdfen-USIn CopyrightCeramicsX-ray diffractionCrystal structuresLattice constantsSodiumArticle - Refereedhttp://scitation.aip.org/content/aip/journal/jap/111/10/10.1063/1.4716027https://doi.org/10.1063/1.4716027