Synthesis of Sr2KNb5O15 thin films by chemical solution deposition method

Crack-free and transparent Sr2KNb5O15 (SKN) thin films have been synthesize d by the chemical solution deposition method. A homogeneous and stable prec ursor solution was prepared via controlling the reaction of metal alkoxides . SKN precursor was found to be the complex alkoxide between Sr[Nb(OEt)(6)] (2) and KNb(OEt)6 with high structural symmetry. SKN powders and thin films on fused silica substrates directly crystallized to the polycrystalline te tragonal tungsten bronze phase at 600 degrees C. Highly oriented SKN thin f ilms with the tetragonal tungsten bronze phase were fabricated on MgO(100) and Pt(100)/MgO(100) substrates. Two crystal lattice planes of SKN were int ergrown at an orientation of 18.5 degrees on MgO(100). The dielectric const ant of SKN thin films on Pt(100)/MgO(100) was about 590 at 20 degrees C at 1 kHz.