Far infrared transmission spectra of ferroelectric guanidine aluminium sulfate hexahydrate

  • X. Gerbaux
  • A. Hadni
  • J. Pierron
Article
Received:

Abstract

Far IR transmission spectra of ferroelectric GASH are obtained at 300 K-80 K and 4 K for crystal plates cut perpendicular to C3 with increasing thicknesses.

Beer's law is well observed from t=20 μm to t=55 μm, which shows that such samples are homogeneous. For t=700 μm the computed absorption is higher than observed, and a surface layer model is proposed where the bulk is more transparent than the surface.

Similar effects have been observed in TGS where even for t=8 mm thick samples, the transmission of the lowest frequency band does not go to zero. A similar experiment is planned for GASH before making any definite conclusion on the evidence of surface layers in GASH.

Keywords

Aluminium Sulfate Surface Layer Frequency Band Transmission Spectrum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Plenum Publishing Corporation 1987

Authors and Affiliations

  • X. Gerbaux
    • 1
  • A. Hadni
    • 1
  • J. Pierron
    • 1
  1. 1.Laboratoire Infrarouge LointainUniversité de Nancy 1Vandoeuvre-les-Nancy CedexFrance

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