NICOP - Development of the Mn-modified High Stability PMN-PZT Single
Abstract
Technical Abstract: This proposed research project aims to develop “Mn-modified [011] high stability PMN-PZT single crystals” for the unbiased operation of sound projectors. For the unbiased operation of piezoelectric single crystal sound projectors, it was recently proposed by transducer designers as well as demonstrated by previous investigations that the piezoelectric single crystals should have the required properties such as k33>0.85, TRT>145oC, low field Qm>580, Tm (maximum compressive stress)>5,000 psi, low field dissipation factor tan d<0.004, relative dielectric K3T variation between 0oC and 50oC<11% and others (as shown in Fig. 2). Very recently NUWC have reported that Mn-modified [011] PMN-PZT single crystals with TRT>140oC have all the required properties and thus are very suitable for the unbiased operation of sound projectors. In this project [011] Pb(Mg1/3Nb2/3)O3-Pb(Zr,Ti)O3 (PMN-PZT) single crystals modified with Mn will be grown by using the solid-state single crystal growth (SSCG) technique. The SSCG technique makes the growth of large and compositionally homogeneous Mn-modified PMN-PZT single crystals (generation III) possible and also offers benefits not achievable using other crystal growth techniques such as Flux and Bridgman methods, i.e. low cost for mass production, compositional homogeneity without gradient of Ti and Mn modifier, high concentration doping of Mn in single crystals, promoting related market growth and mass production for commercialization. By modifying the composition of high TC/TRT PMN-PZT single crystals with Mn (or using the dopant engineering), their dielectric and piezoelectric properties will be tailored from piezoelectrically “soft” to “very hard (1,000<Qm, 200oC<TC, 140oC<TRT)”. Since their TC and TRT are still high after the modification, the Mn-modified PMN-PZT single crystals will show wider range of usage ranges (temperature, stress, and electric field, etc.). A pilot manufacturing process for the production of Mn-modified PMN-PZT crystals by the SSCG technique will also be established after their scale-up test (analysis of production cost, conversion ratio and yield, etc.). These Mn-modified PMN-PZT single crystals are also supplied to NUWC for their characterization as well as to build Tonpilz transducers, as shown in Tables 4 ~7. Finally it will be demonstrated that “Mn-modified [011] high stability PMN-PZT single crystals” are suitable for unbiased operation of sound projectors in the naval applications because of their high stability and thus wide range of usage ranges (temperature, stress, and electric field, etc.). The research is anticipated to guide the practical development of piezoelectric single crystals of critical importance to the Navy mission. The fundamental information gained will be presented and integrated into scientific workshops and symposia to catalyze expansion of the fundamental work and to also inspire practical solutions for developing improved SONAR transducers in the Navy applications.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 08, 2016
- Source ID
- N629091512009
Entities
People
- Ho-yong Lee
Organizations
- Office of Naval Research
- United States Navy