Improvement of thermal stability of PIN-PMN-PT single crystal
Abstract
Improvement of thermal stability of PIN-PMN-PT single crystal. Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 (PIN-PMN-PT) single crystals are promising candidates for Navy SONAR applications. They have excellent piezoelectric properties (electromechanical coupling factor k33~0.92 and piezoelectric constant d33~2000) and can be grown from melts as well as Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMNPT) single crystals which have been commercialized for medical ultrasound transducers. Also they show better thermal and field stability than PMN-PT crystals. Further improvement of thermal stability should be desirable from a view of reliability of piezoelectric devices such as Naval SONAR. Rhombohedral phase PIN-PMN-PT crystals exhibit high piezoelectric properties, while they have rhombohedral to tetragonal phase transition temperature (Trt). If temperature of the crystals exceeds Trt, piezoelectric properties seriously deteriorate. Higher Trt should lead to better thermal stability. Our goal is to grow PIN-PMN-PT single crystals with Trt > 140 oC which is expected to be the highest ever achieved. The relationship between composition and Trt will be investigated in detail since Trt strongly depends on the composition of the crystals. JFE Mineral (JFEM) has successfully developed the Continuous Feeding Growth (CFG) method that enables the growth of uniform composition PIN-PMN-PT single crystals.The CFG method can be a powerful tool to grow consistent composition crystals for this project.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 25, 2019
- Source ID
- N629091912048
Entities
People
- Kazuhiko Echizenya
Organizations
- Office of Naval Research
- United States Navy