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Photopyroelectric method

Determination of the thermal parameters of liquid crystals and antiferromagnetic materials dose to the phase transitions

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Abstract

High resolution measurements have been performed with a photopyroelectric (PPE) technique to study the static and dynamic thermal parameters behaviour in the critical region of different liquid and solid samples. In particular the specific heat (c), the thermal diffusivity (D) and the thermal conductivity (k) have been simultaneously determined in the critical region around the antiferromagnetic/paramagnetic (AP) phase transition occurring in FeF2 and around the Smectic-A/Nematic (AN) phase transition occurring in the 8S5 liquid crystal.

The high resolution of the measuring technique has allowed the determination of thec andD critical exponents and amplitude ratio of their critical terms.

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Authors and Affiliations

  1. Dipartimento di Ingegneria Meccanica, II Università di Roma ‘Tor Vergata’, Via della Ricerca Scientifica e Tecnologica, 00133, Roma, Italy

    F. Mercuri, M. Marinelli, U. Zammit, S. Foglietta & F. Scudieri

Authors
  1. F. Mercuri
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  2. M. Marinelli
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  3. U. Zammit
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  4. S. Foglietta
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  5. F. Scudieri
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Mercuri, F., Marinelli, M., Zammit, U. et al. Photopyroelectric method. Journal of Thermal Analysis 47, 87–92 (1996). https://doi.org/10.1007/BF01982688

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  • DOI: https://doi.org/10.1007/BF01982688

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