Journal of Materials Science

, Volume 48, Issue 19, pp 6605–6612 | Cite as

Diffuse scattering and the mechanism for the phase transition in triglycine sulphate

  • J. M. Hudspeth
  • D. J. Goossens
  • T. R. Welberry
  • M. J. Gutmann
Article

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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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • J. M. Hudspeth
    • 1
  • D. J. Goossens
    • 2
  • T. R. Welberry
    • 2
  • M. J. Gutmann
    • 3
  1. 1.Research School of Physics and EngineeringThe Australian National UniversityCanberraAustralia
  2. 2.Research School of ChemistryThe Australian National UniversityCanberraAustralia
  3. 3.ISIS Facility, Rutherford Appleton Laboratory DidcotUK

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