Preparation and Properties of K(Sr0.75Ba0.25)2Nb5O15 Thin Films by Chemical Solution Deposition Method

Abstract

Crack-free K(Sr0.75Ba0.25)2Nb5O15 (KSBN75) thin films were successfully synthesized by the chemical solution deposition method. A homogeneous and stable precursor solution was prepared by controlling the reaction of metallo-organics. KSBN75 precursor powders were directly crystallized in the tetragonal tungsten bronze phase without formation of a low-temperature phase above 650° C. KSBN75 thin films on MgO(100) and Pt(100)/MgO(100) also crystallized in the tetragonal tungsten bronze phase with preferred c-axis orientation at 700° C. Two crystal lattice planes of KSBN75 were intergrown at an orientation of 18.5° on MgO(100) and Pt(100)/MgO(100) substrates. The Curie point of KSBN75 thin film was around 70° C at 10 kHz. KSBN75 thin films on Pt(100)/MgO(100) substrates exhibited typical P-E hysteresis.