首页|Development of Perovskite based Ceramics for Ultrasonic Applications
Development of Perovskite based Ceramics for Ultrasonic Applications
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NETL
NSTL
Trans Tech Publications Ltd
Perovskite crystal structure is found in many ionic solids like CaTiO_3, BaTiO_3 and PZTs. In this structure off-center position of cations in oxygen octahedral causes polarization and produces direct and indirect piezoelectric responses in ceramic materials that are suitable for many ultrasonic applications. Lead Zirconate Titanate (PZT) with formulae Pb_(0.91)Sr_(0.09)(Zr_(0.53)Ti_(0.47))O_3 was prepared by conventional mixed oxide route with an objective to achieve dense piezoelectric sintered components exhibiting adequate properties for sonar applications. Dielectric and ferroelectric/piezoelectric properties of PZT are strongly influenced by composition, homogeneity and porosity in the densified part. To achieve the objective of a good homogenous and dense body, the initial powders and the final product were characterized by SEM equipped with EDX, XRD and Particle Size Analyzer during each processing step. Electrical characterization was carried out by LCR meter and Transducer Analyzer. Planetary Mill instead of a conventional ball mill was employed for initial mixing and grinding of calcined powder. Properties achieved by sintering at 1200℃ for 2 hours in lead rich atmosphere were Dielectric Cosntant (K) = 1440, Tangent Loss (Tanδ) = 0.0062, Charge Coefficient(d_(33)) = 335 pC/N, Coupling Coefficient (k) = 0.37 and density = 7.55 g/cm~3. After sintering the observed grain size was 2-3 μm with clean grain boundaries. To ascertain the effects of accelerated ageing on dielectric and piezoelectric properties, final product was first heated at 50℃ for 5 days and then at 100℃ for 3 days. The results showed that dielectric and piezoelectric properties were stabilized to a large extent by heating at 100℃ for 3 days. The ageing data for 9% Sr doped PZT is not reported earlier, therefore, it would help in great deal in predicting the performance of component in service.
lead zirconate titanatepiezo-electric ceramicsperovskite based ceramics
M. Khalid、M. Shuaib、A.A. Khan
展开 >
School of Chemical and Materials Engineering (SCME), National University of Sciences and Technology (NUST), Sector H 12, Islamabad, Pakistan
Institute of Space Technology (IST), Islamabad, Pakistan
NETL
NSTL
Trans Tech Publications Ltd
