Abstract
Raman spectroscopy was used to study the effects of Nb additives in ferroelectric lead titanate thin films. Raman spectra were measured from lead titanate thin films with Nb concentrations between 0 and 5%. The Nb additive was found to significantly influence the profile of the A1(2TO) mode, which is the relative vibration between the Ti atom and other atoms along the c-axis, indicating that the doped Nb occupied a Ti position. A decrease of all transverse modes followed the increase in Nb. The observed mode frequencies were used to extract the dependence on Nb addition of the clamped dielectric constants. The dielectric constants along both the a- and c-axes increase with increasing Nb concentration.
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