Chemical processing of potassium substituted (Pb0.6Ba0.4)Nb2O6 powders andthin films through metallo-organics

Highly oriented tungsten bronze K-0.4(Pb0.6Ba0.4)(0.8)Nb2O6 ferroelectric t hin films have been prepared from metal alkoxides and metal acetate by chem ical process. The formation of solid solution with potassium was found to b e very effective to form the tungsten bronze phase at lower temperatures co mpared with (Pb0.6Ba0.4)Nb2O6. The amount of potassium in the composition o f K-x(Pb0.6Ba0.4)(1-x/2)Nb2O6 [0 less than or equal to x less than or equal to 0.4] is also important to crystallize in the tungsten bronze phase. K-0 .4(Pb0.6Ba0.4)(0.8)Nb2O6 films with c-axis preferred orientation were succe ssfully synthesized on MgO(1 0 0) and Pt(1 0 0)/MgO(1 0 0) substrates above 700 degrees C. KPBN60 thin film on Pt(1 0 0)/MgO(1 0 0) showed a remnant p olarization of 20 mu C/cm(2) and a coercive field of 140 kV/cm at -150 degr ees C.