Spontaneous electric fields in solid films: spontelectrics☆

@article{Field2013SpontaneousEF,
  title={Spontaneous electric fields in solid films: spontelectrics☆},
  author={David Field and Oksana Plekan and Andrew Martin Cassidy and Richard Balog and Nykola C. Jones and Jack Dunger},
  journal={International Reviews in Physical Chemistry},
  year={2013},
  volume={32},
  pages={345 - 392}
}
When dipolar gases are condensed at sufficiently low temperature onto a solid surface, they form films that may spontaneously exhibit electric fields in excess of 108 V/m. This effect, called the ‘spontelectric effect’, was recently revealed using an instrument designed to measure scattering and capture of low energy electrons by molecular films. In this review it is described how this discovery was made and the properties of materials that display the spontelectric effect, so-called… Expand
Electric field structures in thin films: formation and properties.
TLDR
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A review of recent progress in understanding the spontelectric state of matter
Abstract The spontelectric state of matter is exemplified by the presence of static, spontaneous electric fields extending throughout thin films of dipolar solids. The spontelectric state wasExpand
Investigations into the nature of spontelectrics: nitrous oxide diluted in xenon.
TLDR
A simplified theoretical model is developed which illustrates that electric fields can be understood in terms of dilution-dependent dipole orientation, and shows that dipole-dipole interactions are an essential ingredient for the creation of the spontelectric state. Expand
Dipole-Oriented Molecular Solids Can Undergo a Phase Change and Still Maintain Electrical Polarization
It has recently been demonstrated that nanoscale molecular films can spontaneously assemble to self-generate intrinsic electric fields that can exceed 108 V/m. These electric fields originate fromExpand
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TLDR
It is shown that temperature-programmed contact potential difference measurements performed by a Kelvin probe and especially their temperature derivative can track film reorganization/reconstruction and crystallization at temperatures significantly lower than the film desorption. Expand
The optical absorption spectra of spontaneously electrical solids: the case of nitrous oxide.
TLDR
Results demonstrate how the spontelectric effect can be used as a tool for exploring the structure of solids and give a graphic image of the structural changes that take place close to the known phase change at 47 K/48 K. Expand
Crystallites and Electric Fields in Solid Ammonia
TLDR
Absorption spectra of vacuum‐deposited films of ammonia have been obtained, giving a more quantitative description than the nebulous term amorphous, as applied to solid ammonia, and enabling a lower limit of 1.58 nm on the size of crystallites in the low temperature regime. Expand
Sign flipping of spontaneous polarization in vapour-deposited films of small polar organic molecules.
TLDR
The investigated bulk effect for 18 small organic molecules and found that, as a rule, alcohol films have the negative end on the vacuum side at all temperatures, which expands substantially the experimental information regarding spontaneous polarization in vapour-deposited films. Expand
The role of thermal history on spontaneous polarization and phase transitions of amorphous solid water films studied by contact potential difference measurements.
TLDR
It is demonstrated that temperature-programmed contact potential difference measurements employed by a Kelvin probe under ultrahigh vacuum conditions and their temperature derivative can track films' restructure and crystallization occurring in amorphous solid water (ASW) at temperatures well below the onset of film desorption. Expand
Non-linear and non-local behaviour in spontaneously electrical solids.
  • M. Roman, S. Taj, +6 authors D. Field
  • Materials Science, Medicine
  • Physical chemistry chemical physics : PCCP
  • 2018
TLDR
RAIRS data confirm that the behaviour of spontelectrics is governed by an expression for the degree of dipole orientation, which is continuous in temperature, but with a discontinuity in the derivative, and that the temperature of deposition associated with this discontinuity matches the temperature above which dipole order switches from the expected reduction with temperature to an increase with temperature. Expand
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