Micro-Raman spectroscopic investigation of rare earth-modified lead zirconate titanate ceramics

• Published in: Ceramics international Vol. 33; no. 4; pp. 595 - 600
• Main Authors: Shannigrahi, S.R., Tripathy, S.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-01-2007; Elsevier Science
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Electrotechnical and electronic ceramics; Exact sciences and technology; La- and Pr-doped PZT; Lead zirconate titanate (PZT); Raman spectroscopy; Technical ceramics; Raman spectroscopy; La- and Pr-doped PZT; Lead zirconate titanate (PZT); Scanning electron microscopy; Electrical properties; Property composition relationship; Lead titanates; Dielectric properties; Doping; Piezoelectric properties; PZT; Experimental study; Ferroelectric properties; X ray diffraction; Oxide ceramics; Lead zirconates; Rare-earth metal addition; Praseodymium addition; Sol gel process; Manufacturing; Lanthanum addition; Raman spectrum; Electroceramics
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2005.11.015

Rare earth-modified lead zirconate titanate (PRZT) ceramics [R/Zr/Ti
=
8/60/40; R
=
La and Pr] are prepared by a sol–gel technique. Substantial changes in the dielectric, ferroelectric and piezoelectric properties are observed between La- and Pr-modified PZT ceramics. To correlate the observed differences in the electrical properties with structural modifications, temperature-dependent Raman scattering measurements have been carried out. Significant asymmetric phonon line broadening with a noticeable downward shift has been observed for peaks associated with
E and
A
1 symmetry, particularly in Pr-modified PZT when the sample temperature increases. In addition, low-temperature Raman spectra of Pr-modified PZT show splitting of the
A
1(1TO) mode and appearance of the sub-peak structures. Such sub-peak structures arising around
A
1(1TO) mode could be due to the presence of thermodynamically stable defect-impurity complexes.