Influence of the A and B vacancies on the dielectric and structural properties of the PLZT 8/60/40 ferroelectric ceramic system

✍ Scribed by O. García-Zaldívar; A. Peláiz-Barranco; J.D.S. Guerra; M.E. Mendoza; F. Calderón-Piñar; D.A. Hall

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 890 KB
• Volume: 406
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2011.02.011

✦ Synopsis

The lanthanum modified lead zirconate titanate (PLZT) ferroelectric ceramics, considering La/Zr/Ti ratio of 8/60/40 and vacancies in A or B sites of the perovskite structure, have been analyzed by using X-ray diffraction, dielectric response, polarized light microscopy and ferroelectric hysteresis. No remarkable differences are observed between samples with A or B vacancies from the X-ray diffraction patterns and ferroelectric hysteresis loops. However, the dielectric measurements have revealed a significant decrease in the maximum values for the real part of the dielectric permittivity and an enhancement of the relaxor behavior in the systems where A vacancies have been considered. On the other hand, the anomalies observed in the temperature dependence of the remanent polarization suggest a frozen out in the dynamic of Nanometric Polar Regions (PNRs) around the same region of temperatures for both samples.