Abstract
Despite the order/disorder nature of its ferroelectric phase transition, and evidence for the evolution of local order as being important for understanding the transition, no comprehensive diffuse scattering study of the short-range order in triglycine sulphate, (TGS), (NH2CH2COOH)3H2SO4 has been undertaken. Diffuse scattering from single crystals is sensitive to two-body correlations, and can act as a probe of local structure, which in a second order phase transition acts as a precursor to the low temperature phase. The role of hydrogen bonding and dipolar interactions in the ferroelectric phase transition in TGS has been a long matter of conjecture. Using neutron and X-ray single crystal diffuse scattering this study shows that hydrogen bond mediated interactions between polarising glycine molecules cause local one-dimensional polarised domains to develop, oriented parallel to the b axis. These domains interact via dipolar interactions, and the three-dimensional ferroelectric order arises. This provides a real-space, interaction-based model for the phase transition in TGS, showing in detail how the local chemistry and physics give rise to the polarised state.
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Acknowledgements
The authors gratefully acknowledge the Australian Institute for Nuclear Science and Engineering, the NCI National Facility and the Australian Research Council. Use of the Advanced Photon Source was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
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Hudspeth, J.M., Goossens, D.J., Welberry, T.R. et al. Diffuse scattering and the mechanism for the phase transition in triglycine sulphate. J Mater Sci 48, 6605–6612 (2013). https://doi.org/10.1007/s10853-013-7457-8
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DOI: https://doi.org/10.1007/s10853-013-7457-8