Tendency to promote ferroelectric distortion in Pr-modified PbTiO3

Kalyani, Ajay Kumar; Garg, Rohini; Ranjan, Rajeev
November 2009
Applied Physics Letters;11/30/2009, Vol. 95 Issue 22, p222904
Academic Journal
Structural, microstructural, and dielectric studies have been carried out on Pr-modified PbTiO3. A comparative analysis with La-modified PbTiO3 suggests that for chemical modification by same amount, the Pr-modified system has larger tetragonal strain and Curie point. No clear feature of relaxor ferroelectric state is observed for Pr concentration as high as x=0.35, suggesting that Pr modification is less effective, as compared to La-modification, in inducing a relaxor ferroelectric state. Results suggest that inspite of increased chemical disorder, Pr modification partly tends to restore the ferroelectric distortion of the lattice through partial occupancy of the Pr4+ ions on the Ti4+ sites.


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