Schneider, Deborah ; Rödel, Jürgen ; Rytz, Daniel ; Granzow, Torsten (2015):
Orientation-Dependence of Thermal Depolarization and Phase Development in Bi1/2 Na1/2 TiO3-BaTiO3 Single Crystals.
In: Journal of the American Ceramic Society, 98 (12), pp. 1-9. ISSN 00027820,
[Article]
Abstract
The direction-dependence of pyroelectric properties of (1 – x) Bi1/2 Na1/2 TiO3 – xBaTiO3 (BNT – 100xBT) is investigated, using single crystal samples with well-defined orientations for x = 0.036 and x = 0.063. The results are compared with those of temperature-dependent measurements of the ferroelectric and dielectric hysteresis. The depolarization temperature Td of each crystal composition is found to depend on crystal orientation, a fact that is explained by differences in the stability of respective domain configurations. A rationalization is offered for the observation that Td differs from the ferroelectric-relaxor transition temperature, depending on orientation. The hysteresis curves of BNT – 3.6BT are typical for a rhombohedral system with a ferroelectric-relaxor transition, with polarization reversal close to Td occurring in a multistep process that includes decay of ferroelectric domains into polar nanoregions and re-formation of domains. BNT – 6.3BT, a composition in the region of the morphotropic phase boundary, shows the same feature, but additionally is characterized by a field-induced transition between rhombohedral and tetragonal symmetry. This combination results in an effective piezoelectric coefficient of d*33=1886 pm/V.
| Item Type: | Article |
|---|---|
| Erschienen: | 2015 |
| Creators: | Schneider, Deborah ; Rödel, Jürgen ; Rytz, Daniel ; Granzow, Torsten |
| Title: | Orientation-Dependence of Thermal Depolarization and Phase Development in Bi1/2 Na1/2 TiO3-BaTiO3 Single Crystals |
| Language: | English |
| Abstract: | The direction-dependence of pyroelectric properties of (1 – x) Bi1/2 Na1/2 TiO3 – xBaTiO3 (BNT – 100xBT) is investigated, using single crystal samples with well-defined orientations for x = 0.036 and x = 0.063. The results are compared with those of temperature-dependent measurements of the ferroelectric and dielectric hysteresis. The depolarization temperature Td of each crystal composition is found to depend on crystal orientation, a fact that is explained by differences in the stability of respective domain configurations. A rationalization is offered for the observation that Td differs from the ferroelectric-relaxor transition temperature, depending on orientation. The hysteresis curves of BNT – 3.6BT are typical for a rhombohedral system with a ferroelectric-relaxor transition, with polarization reversal close to Td occurring in a multistep process that includes decay of ferroelectric domains into polar nanoregions and re-formation of domains. BNT – 6.3BT, a composition in the region of the morphotropic phase boundary, shows the same feature, but additionally is characterized by a field-induced transition between rhombohedral and tetragonal symmetry. This combination results in an effective piezoelectric coefficient of d*33=1886 pm/V. |
| Journal or Publication Title: | Journal of the American Ceramic Society |
| Volume of the journal: | 98 |
| Issue Number: | 12 |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials |
| Date Deposited: | 12 Nov 2015 13:08 |
| Identification Number: | doi:10.1111/jace.13843 |
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