Role of coexisting tetragonal regions in the rhombohedral phase of Na0.5Bi0.5TiO3-xat.%BaTiO3 crystals on enhanced piezoelectric properties on approaching the morphotropic phase boundary

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Date
2012-01-01
Author
Yao, Jianjun
Monsegue, Niven
Murayama, Mitsuhiro
Leng, W. N.
Reynolds, W. T.
Zhang, Qinhui
Luo, Haosu
Li, Jiefang
Ge, Wenwei
Viehland, Dwight D.
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Abstract
The ferroelectric domain and local structures of Na0.5Bi0.5TiO3-xat.%BaTiO3 (NBT-x%BT) crystals for x = 0, 4.5, and 5.5 have been investigated by transmission electron microscopy. The results show that the size of polar nano-regions was refined with increasing xat. %BT. The tetragonal phase volume fraction, as identified by in-phase octahedral tilting, was found to be increased with BT. The findings indicate that the large electric field induced strains in morphotropic phase boundary compositions of NBT-x%BT originate not only from polarization rotation but also polarization extension. (C) 2012 American Institute of Physics. [doi: 10.1063/1.3673832]
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http://hdl.handle.net/10919/24959
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