We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Effect of excess Pb on microstructures and electrical properties of 0.67Pb(MgNb)O-0.33PbTiO ceramics.
- Authors
Zhang, Y. C.; Yang, Z. Z.; Ye, W. N.; Lu, C. J.; Xia, L. H.
- Abstract
0.67Pb(MgNb)O-0.33PbTiO (PMNT) ceramics were fabricated by using their powders synthesized through a sol-gel process. Excess Pb(CHCOO)·3HO (0, 2, 5, 10 or 15 mol%) was added to the starting materials to study the effect of excess Pb on the microstructures, ferroelectric and dielectric properties of the PMNT ceramics. All the X-ray diffraction peaks can be indexed using perovskite-type PMNT for the ceramics prepared with excess Pb, while the PMNT ceramics with no excess Pb contain a little pyrochlore phase. The PMNT ceramics prepared with 2 mol% excess Pb are dense and uniform and composed of grains ranging from 3 to 7 μm. They exhibit the largest remnant polarization ( P = 32.1 μC/cm) and the highest peak dielectric constant ( ε = 12,725). When more than 2 mol% excess Pb added, the electrical properties of the PMNT ceramics decreased with increasing excess Pb. Too much excess Pb (over 10 mol%) resulted in abnormal grain growth (>20 μm), large pores and residual PbO in amorphous state in PMNT ceramics, and they impaired the ferroelectric and dielectric properties of PMNT ceramics greatly.
- Subjects
PIEZOELECTRIC ceramics; MICROSTRUCTURE; ELECTRIC properties of materials; LEAD; PEROVSKITE; DIELECTRICS; FERROELECTRIC crystals; X-ray diffraction
- Publication
Journal of Materials Science: Materials in Electronics, 2011, Vol 22, Issue 3, p309
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-010-0134-7