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Orientation-Dependence of Thermal Depolarization and Phase Development in Bi1/2 Na1/2 TiO3-BaTiO3 Single Crystals

Schneider, Deborah and Rödel, Jürgen and Rytz, Daniel and 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, 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 and Rödel, Jürgen and Rytz, Daniel and 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
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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