IMPROVEMENT OF MECHANICAL AND ELECTRICAL PROPERTIES OF PNN-PZT CERAMICS WITH STRONTIUM CONTENT
Keywords:
Piezoelectric, PNN-PZT, Dielectric, lowtemperature, PZTAbstract
In this research, mechanical and electrical properties of ceramics from PSNN-PZT system havebeen investigated. The ceramics with formula of Pb(1-x) Srx (Ni0.33 Nb0.67)0.5 Ti0.35 Zr0.15 O3 where x = 0.00, 0.02, 0.04, 0.06 and 0.08 were prepared by a conventional mixed-oxide method. There sults showed that with increasing Sr concentration, dielectric constant versus temperature curves become gradually broader. The degree of diffuse phase transition was enhanced with Sr dopant. The substitution of Pbion by Sr ion in the PSNN-PZT ceramics resulted in an improvement of their hardness, and fracture toughness. The maximum room temperature dielectric constant, hardness and fracture toughness were achieved from the sample with x = 0.06. This is considered as the optimized composition in this study.
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