INFLUENCE OF La in xPBBiN OF TERNARY NANOCERAMIC COMPOSITE (1-x)0.5PMN-0.5PZT-xPBBiN SYSTEM BY MECHANIC AL ACTIVATIO N TECHNIQUE FOR DIELECTRIC AND PIEZOELECTRIC PROPERTIES

摘要

(1-x)[0.5Pb(Mg_(0.33)Nb_(0.67))O?-0.5Pb(Zr_(0.53)Ti_(0.47))O?]-x[Pb_(0.557)Ba_(0.38)La_(0.022)Bi_(0.02)Nb?O?] with both perovskite and tungsten bronzestructured composite have been synthesized through mechanical activation technique. The strong influence of lanthanumaddition to the lead-barium-bismuth-niobate (xPBLBiN) ceramics in perovskite structured (1-x)PMN-PZT on structural andfunctional properties is confirmed. X-ray diffraction patterns studies showed that these complex composites consisted ofperovskite Cubic with tungsten bronze Orthorhombic phases. La modification in PBBiN of a ternary system (1-x)PMN-PZTxPBBiNrevealed intensified orthorhombicity. As La increased the dielectric and piezoelectric properties tremendously increasedin (1-x)PMN-PZT-xPBLBiN nanoceramic composite. The optimum dielectric and piezoelectric properties (ε_(RT) = 2931,k_(p) = 0.461 and d?? = 428 pC/N) were found in x =0.4 composite. We achieved novel nanocomposites synthesized by highenergy ball milling method and having binary structures in a single composite with excellent functional properties that canbe used for energy harvesting applications.