SYNTHESIS OF HIGHLY ORIENTED K(TA,NB)O-3 (TA-NB=65 35) FILM USING METAL ALKOXIDES/

Highly oriented K(Ta,Nb)O-3 (Ta:Nb = 65:35) (KTN) thin films of perovs kite structure were synthesized successfully on Pt(100)/MgO(100) subst rates from a metal alkoxide solution through reaction control. Homogen eous KTN coating solutions prepared from KOC2H5, Ta(OC2H5)(5), and Nb( OC2H5)(5) in ethanol were analyzed by H-1, C-13, and Nb-93 NMR spectro scopy. The KTN precursor included a molecular-level mixture of K[M(OC2 H5)(6)] (M = Ta, Nb) units interacting in ethanol solution. X-ray pole figure measurement showed that perovskite KTN films crystallized on P t(100)/MgO(100) substrates had not only a (100) orientation but also a three-dimensional regularity of grains. The remanent polarization and coercive field of the KTN film (thickness, 1.0 mu m) crystallized at 700 degrees C were 1.5 mu C/cm(2) and 8.7 kV/cm, respectively, at 225 K.