Abstract
The effect of dopants on the microstructure and lattice parameters of Pb0.94Sr0.06(Zr0.53Ti0.47)O3 ceramics was studied. Small amounts (0 to 0.3 wt%) of Cr2O3, MnO2, Co2O3 and U3O8, were used as dopants. In a few compositions two oxides were used, namely U3O8 with Cr2O3 as well as MnO2 with Cr2O3 X-ray diffraction investigation of powdered samples showed that all the compositions (both modified and unmodified) were of perovskite type with tetragonal symmetry. The Curie temperature was decreased with the decrease of tetragonal distortion indicated by the axial ratio,c0/a0, in all cases. The average grain sizes for the doped and undoped compositions were determined from SEM photomicrographs of polished and acid-etched surfaces using the linear intercept technique. The average grain size for the undoped composition was found to be 10.7μm. The addition of a small amount of dopants controlled the grain growth to give rise to the average grain size of 6.4 to 9.5μm, which appeared to have some effect on the improvement of the piezoelectric properties of the ceramics.
Published Version
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