Ceramics-Silikáty 55, (2) 134 - 139 (2011) |
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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
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Ramam Koduri 1, Chandramouli K. 2
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1 Departmento de Ingenieria de Materials, (DIMAT), Facultad de Ingenieria,
Universidad de Concepcion, Concepcion, Chile
2 Solid State Physics and Materials Research Laboratory, Department of Physics,
Andhra University, Visakhapatnam, India
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Keywords: Ferroelectrics, X-ray diffraction, Dielectric response, Mechanical Activation, Piezoelectricity
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(1-x)[0.5Pb(Mg0.33Nb0.67)O₃-0.5Pb(Zr0.53Ti0.47)O₃]-x[Pb0.557Ba0.38La0.022Bi0.02Nb₂O₆] with both perovskite and tungsten bronze
structured composite have been synthesized through mechanical activation technique. The strong influence of lanthanum
addition to the lead-barium-bismuth-niobate (xPBLBiN) ceramics in perovskite structured (1-x)PMN-PZT on structural and
functional properties is confirmed. X-ray diffraction patterns studies showed that these complex composites consisted of
perovskite Cubic with tungsten bronze Orthorhombic phases. La modification in PBBiN of a ternary system (1-x)PMN-PZTxPBBiN
revealed intensified orthorhombicity. As La increased the dielectric and piezoelectric properties tremendously increased
in (1-x)PMN-PZT-xPBLBiN nanoceramic composite. The optimum dielectric and piezoelectric properties (εRT = 2931,
kp = 0.461 and d₃₃ = 428 pC/N) were found in x =0.4 composite. We achieved novel nanocomposites synthesized by high
energy ball milling method and having binary structures in a single composite with excellent functional properties that can
be used for energy harvesting applications. |
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