Large pyroelectric response in relaxor-based ferroelectric (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 single crystals
Abstract
The pyroelectric properties of (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT) single crystals have been investigated over a broad composition range of 0.13<=x<=0.40. The best pyroelectric performances are achieved in <111>-oriented PMN-0.26PT single crystal. At room temperature, the figures of merit for voltage responsivity and detectivity reach up to 0.11 m2/C and 15.3×10-5 Pa-1/2, respectively. These properties are superior to those of conventional pyroelectric ceramics that have been widely used in device applications. PMN-0.26PT single crystal also possesses a relative high Curie temperature (~120 °C) and a low thermal diffusivity (~4.4×10-7 m2/s). Furthermore, the pyroelectric properties of PMN-xPT (x>=0.26) single crystals are weak dependent on temperature and nearly independent of frequency in the experimental temperature range of 20-55 °C and frequency range of 50-10 000 Hz. The superior pyroelectric performances of the single crystal make it a promising candidate for high-performance uncooled infrared detectors and thermal imagers.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- October 2005
- DOI:
- 10.1063/1.2106014
- Bibcode:
- 2005JAP....98h4104T
- Keywords:
-
- 77.84.Dy;
- 77.80.Bh;
- 77.70.+a;
- 82.80.-d;
- 61.50.-f;
- Niobates titanates tantalates PZT ceramics etc.;
- Phase transitions and Curie point;
- Pyroelectric and electrocaloric effects;
- Chemical analysis and related physical methods of analysis;
- Crystalline state