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Ferroelastic phase transition in CaCl2 studied by Raman spectroscopy

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Zeitschrift für Physik B Condensed Matter

Abstract

CaCl2 undergoes a second-order proper ferroelastic phase transition from the tetragonal rutile type to the orthorhombic calcium-chloride type structure atT c ≈490 K. The transition is of the optical type and induced by an order parameter ofB 1g symmetry. An underdamped soft mode exists above and belowT c , the frequency and intensity of which have been measured by Raman spectroscopy. Due to a strong coupling to strain the softening is incomplete and a transverse acoustical mode is predicted to become soft. The frequency of the optical soft mode, ωs, exhibits a classical Landau behavior in a remarkably large temperature range. The unusual value of the ratio of ∂ω 2s /∂ below and aboveT c of about −6.5 can be accounted for by appropriate terms of the thermodynamical potential. The Raman active hard modes show no significant anomaly atT c .

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Author notes

  1. Ch. Hahn

    Present address: Abteilung ETII, Dornier GmbH, W-7990, Friedrichshafen 1, Federal Republic of Germany

Authors and Affiliations

  1. Fachbereich Physik, Universität des Saarlandes, W-6600, Saarbrücken, Federal Republic of Germany

    H. -G. Unruh, D. Mühlenberg & Ch. Hahn

Authors
  1. H. -G. Unruh
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  2. D. Mühlenberg
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  3. Ch. Hahn
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Unruh, H.G., Mühlenberg, D. & Hahn, C. Ferroelastic phase transition in CaCl2 studied by Raman spectroscopy. Z. Physik B - Condensed Matter 86, 133–138 (1992). https://doi.org/10.1007/BF01323557

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  • DOI: https://doi.org/10.1007/BF01323557

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