Abstract
Polyethylene glycol (PEG)-assisted solid state reaction route is employed to prepare the relaxor-type ferroelectric powders and ceramics of (1-x)Pb(Ni1/3Nb2/3)O3-xPbTiO3(PNN-PT) with the morphotropic phase boundary (MPB) composition at x=0.36 (0.64PNN-0.36PT). PEG additive with the molecular weight of 200 is introduced into PNN-PT oxide precursors in order to obtain the perovskite phase. The XRD and TG/DSC results demonstrate that the interactions between PbO and PEG favor the transformation from the lead-rich pyrochlore to the lead-deficient pyrochlore, thus facilitating the formation of the perovskite. Consequently, nearly pure perovskite 0.64PNN-0.36PT powders are synthesized at a relatively low temperature of 850 °C. A significant improvement of electric properties of the ceramics sintered at 1200 °C is achieved by PEG modification. The dielectric constant at room temperature and the maximum dielectric constant at Tcreach 4987 and 24307, respectively, at a frequency of 1 kHz. The piezoelectric constant d33is 460 pC/N.
Original language | English |
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Title of host publication | International Conference on Smart Materials and Nanotechnology in Engineering |
Volume | 6423 |
DOIs | |
Publication status | Published - 1 Dec 2007 |
Event | International Conference on Smart Materials and Nanotechnology in Engineering - Harbin, China Duration: 1 Jul 2007 → 4 Jul 2007 |
Conference
Conference | International Conference on Smart Materials and Nanotechnology in Engineering |
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Country/Territory | China |
City | Harbin |
Period | 1/07/07 → 4/07/07 |
Keywords
- Dielectric properties
- Ferroelectric properties
- Interaction
- PEG200
- Perovskite
- Piezoelectric properties
- PNN-PT
- Pyrochlore
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering