THE EFFECT OF V2O5 ADDITION ON FERROELECTRIC PROPERTIES OF SR0.3BA0.7NB2O6 CERAMICS

Sr0.3Ba0.7Nb2O6 (SBN30) compacts with 1 mol% V2O5 addition were fabric ated at relatively lower temperatures by liquid phase sintering. A con siderable elongation and coarsening of grains were observed after prol onged sintering at 1200 degrees C. The ferroelectric properties were i mproved by the addition of V2O5: sharpening of the dielectric peak and shift in Curie temperature from 175 to 225 degrees C. The modified fe rroelectric properties might be attributed to decrease in the internal stress and compositional fluctuation with coarsening of grains. The p yroelectric coefficient of V2O5-added compacts (1200 degrees C, 14h) a t room temperature was 8.0 x 10(-5) C/m(2) . K.