High temperature limitation due to onset of depoling in BiScO3–PbTiO3
Abstract
Thermal depoling is investigated with impedance spectroscopy as a function of temperature and frequency for unmodified and ZnSc′ modified compositions around the morphotropic phase boundary (MPB) in the high temperature material (1−x)BiScO3–xPbTiO3 (BSPT). By tracking the shape and width of the fundamental resonance peaks and phase angle during impedance analysis, it was shown that the depoling temperature (Td), usually considered a single temperature, can actually be characterized as occurring over a range with an onset temperature (Tdonset) and a final temperature (Tdfinal). When this technique is applied to the rhombohedral compositions near the MPB of BSPT, it is seen that the peak narrowing in phase angle closely correlates to the rhombohedral-tetragonal phase transition decreasing from 350 °C to 300 °C when increasing from 58% to 62% PT. The Tdonset and the subsequent correlation to the phase transition are investigated further through aliovalent substitution of 1%, 2%, and 5% ZnSc in BS-PT. The Tdonset for the rhombohedral compositions displays enhancement over the unmodified compositions at ∼12 °C/1% ZnSc.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 14, 2017
- Source ID
- 10.1063/1.4975785
Entities
People
- Alp Sehirlioglu
- Benjamin A. Kowalski
Organizations
- Air Force Office of Scientific Research
- Case Western Reserve University
- Glenn Research Center