Pforr, Florian and Meyer, Kai-Christian and Albe, Karsten and Donner, Wolfgang (2017):
Relaxation of dynamically disordered tetragonal platelets in the relaxor ferroelectric 0.964Na1/2Bi1/2TiO3-0.036BaTiO3.
In: Physical Review B, 91 (184107), pp. 1-11. APS Publishing, ISSN 2469-9950,
DOI: 10.1103/PhysRevB.96.184107,
[Article]

Abstract

The local dynamics of the lead-free relaxor 0 . 964Na 1 / 2 Bi 1 / 2 TiO 3 -0 . 036BaTiO 3 (NBT-3.6BT) have been investigated by a combination of quasielastic neutron-scattering (QENS) and ab initio molecular dynamics simulations. In a previous paper, we were able to show that the tetragonal platelets in the microstructure are crucial for understanding the dielectric properties of NBT-3.6BT [Pforr et al. , Phys. Rev. B 94 , 014105 ( 2016 )]. To investigate their dynamics, ab initio molecular dynamics simulations were carried out using Na 1 / 2 Bi 1 / 2 TiO 3 with 001 cation order as a simple model system for the tetragonal platelets in NBT-3.6BT. Similarly, 111-ordered Na 1 / 2 Bi 1 / 2 TiO 3 was used as a model for the rhombohedral matrix. The measured single-crystal QENS spectra could be reproduced by a linear combination of calculated spectra. We find that the relaxational dynamics of NBT-3.6BT are concentrated in the tetragonal platelets. Chaotic stages, during which the local tilt order changes incessantly on the time scale of several picoseconds, cause the most significant contribution to the quasielastic intensity. They can be regarded as an excited state of tetragonal platelets, whose relaxation back into a quasistable state might explain the frequency dependence of the dielectric properties of NBT-3.6BT in the 100 GHz to THz range. This substantiates the assumption that the relaxor properties of NBT-3.6BT originate from the tetragonal platelets.

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