Ceramics-Silikáty 54, (4) 303 - 309 (2010) |
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MnO₂ MODIFIED LEAD LANTHANUM SILVER ZIRCONIUM TITANATE CERAMICS FOR DIELECTRIC AND PIEZOELECTRIC PROPERTIES
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Ramam Koduri 1, Chandramouli Kemburu 2
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1 Departmento de Ingenieria de Materials, (DIMAT), Facultad de Ingeniería,
Universidad de Concepción, Concepción, Chile
2 Solid State Physics and Materials Research Laboratory, Department of Physics,
Andhra University, Visakhapatnam, India
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Keywords: Ceramics, Microstructure, Dielectric properties, Piezoelectricity
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This study highlights the influence of acceptors, Ag at A-site and Mn at B-site in Pb(1-x-y)LaxAgy(ZrzTi1-z)1-((x-y)/4)-(4k/4)MnkO₃
ceramic system where Mn (k) ranged from 0, 0.2, 0.4. 0.6, 0.8 and 1 mol% synthesized through solid state reaction method.
Dielectric (εRT = 2802) and piezoelectric properties (d₃₃ = 548 pC/N, kp = 0.541) were maximum at Mn0.01 and can be attributed
to (1) grain boundary kinetics via domain orientation with a reduction of oxygen vacancy migration, (2) compensation of lead
vacancies by Mn and Ag, and (3) morphotrophic phase boundary shifting from coexistence of rhombohedral and tetragonal
phase to tetragonality. The high electromechanical properties of this ceramic system were evaluated and are discussed with
phase formation, microstructure, and dielectric characterization. It has been observed that the optimum properties are found
in Mn0.01 which could be suitable for possible energy harvesting or electromechanical applications. |
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