Structural disorder in the key lead-free piezoelectric materials, K <inf>x</inf>Na<inf>1-x</inf> NbO<inf>3</inf> and (1 - X) Na<inf>0.5</inf> Bi<inf>0.5</inf> TiO<inf>3</inf> + x BaTiO<inf>3</inf>
Advances in Condensed Matter Physics
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Schiemer, J., Withers, R., Liu, Y., Guo, Y., Yi, Z., & Wang, J. (2013). Structural disorder in the key lead-free piezoelectric materials, K <inf>x</inf>Na<inf>1-x</inf> NbO<inf>3</inf> and (1 - X) Na<inf>0.5</inf> Bi<inf>0.5</inf> TiO<inf>3</inf> + x BaTiO<inf>3</inf>. Advances in Condensed Matter Physics https://doi.org/10.1155/2013/296419
Using electron diffraction, trends in the local structural behaviour of the NNb (KNN x) and the (NBT-()BT) systems are investigated. In KNN, electron diffraction shows a single plane of diffuse intensity perpendicular to  across the entire phase diagram, indicating the existence of ferroelectric disorder along this axis. An additional characteristic pattern of diffuse scattering is also observed, involving rods of diffuse intensity running along the and directions of the perovskite substructure and indicative of octahedral tilt disorder about these axes. Similarly, in the NBT-xBT system, rods of diffuse intensity running along the directions of the perovskite substructure are observed, again indicating octahedral tilt disorder. Ferroelectric-like disorder is also observed in highly BT doped samples, and a continuous change from the “rhombohedral” structure of NBT to the “tetragonal” structure of NBT-12BT is seen from characteristic variation in observed superstructure reflections. A crystal chemical rationalisation of these results is performed, and the implications for structure and properties are discussed.
External DOI: https://doi.org/10.1155/2013/296419
This record's URL: https://www.repository.cam.ac.uk/handle/1810/267616
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