Structural and ferroelectric phase evolution in [ KNbO

Christopher J. Hawley,1 Liyan Wu,2 Geoffrey Xiao,1 Ilya Grinberg,3 Andrew M. Rappe,2,4 Peter K. Davies,2 and Jonathan E. Spanier1,5,* 1Department of Materials Science & Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA 2Department of Materials Science & Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA 3Department of Chemistry, Bar Ilan University, Ramat-Gan 5290002, Israel 4Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA 5Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA (Received 22 January 2017; revised manuscript received 1 August 2017; published 28 August 2017)