Journal
JOURNAL OF APPLIED PHYSICS
Volume 110, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3645054
Keywords
-
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG) [SFB 595]
- Engineering and Physical Sciences Research Council [EP/G005001/1] Funding Source: researchfish
- EPSRC [EP/G005001/1] Funding Source: UKRI
Ask authors/readers for more resources
Temperature-dependent dielectric permittivity of 0.94(Bi1/2Na1/2) TiO3-0.06BaTiO(3) (BNT-6BT) lead-free piezoceramics was studied to disentangle the existing unclear issues over the crystallographic aspects and phase stability of the system. Application of existing phenomenological relaxor models enabled the relaxor contribution to the entire dielectric permittivity spectra to be deconvoluted. The deconvoluted data in comparison with the temperature-dependent dielectric permittivity of a classical perovskite relaxor, La-modified lead zirconate titanate, clearly suggest that BNT-6BT belongs to the same relaxor category, which was also confirmed by a comparative study on the temperature-dependent polarization hysteresis loops of both materials. Based on these results, we propose that the low-temperature dielectric anomaly does not involve any phase transition such as ferroelectric-toantiferroelectric. Supported by transmission electron microscopy and X-ray diffraction experiments at ambient temperature, we propose that the commonly observed two dielectric anomalies are attributed to thermal evolution of ferroelectric polar nanoregions of R3c and P4bm symmetry, which coexist nearly throughout the entire temperature range and reversibly transform into each other with temperature. (C) 2011 American Institute of Physics. [doi:10.1063/1.3645054]
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available