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Persistent URL http://purl.org/net/epubs/work/65680
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Record Id 65680
Title Diffuse scattering and the mechanism for the phase transition in triglycine sulphate
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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.
Organisation ISIS , ISIS-SXD , STFC
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Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article J Mater Sci 48, no. 19 (2013): 6605-6612. doi:10.1007/s10853-013-7457-8 2013