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Thermodynamic studies on the ferroelectric phase transition in neutron irradiated (LixK1−x)2SO4 crystals at high temperature

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Abstract

Thermodynamic studies of (LixK1−x)2SO4, LKS, mixed crystals have been made in the concentration range (x=0.1, 0.2, ...,x=0.5). The thermal behaviour has been investigated by differential thermal analysis, DTA, and differential scanning calorimeter, DSC, in the vicinity of high temperature phases. Also, the effect of the thermal neutron irradiations on the thermal properties of mixed crystals was studied. The results showed a change in the transition temperatureT c, as well as the value of specific heatC p at transition temperature, due to the change of stoichiometric ratio and radiation doses. The change of enthalpy and entropy of mixed crystals have been estimated numerically.

Zusammenfassung

Im Konzentrationsbereich (x=0.1, 0.2, ...,x=0.5) wurden thermodynamische Untersuchungen an (LixK1−x)2SO4, LKS, Mischkristallen durchgeführt. Mittels DTA und DSC wurde das thermische Verhalten in der NÄhe von Hochtemperatur-Phasen untersucht. Weiterhin wurde der Einflu\ von thermischer Neutronenbestrahlung auf die thermischen Eigenschaften der Mischkristalle beleuchtet. In Zusammenhang mit der stöchiometrischen Zusammensetzung und der Strahlungsdosis zeigen die Ergebnisse sowohl eine Änderung der UmwandlungstemperaturT c als auch der spezifischen WÄrmeC p im Umwandlungspunkt. Die Enthalpie- und EntropieÄnderung der Mischkristalle wurde annÄhernd auch numerisch bestimmt.

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Author information

Author notes

  1. M. E. Kassem

    Present address: Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt

  2. M. M. Denton

    Present address: Nuclear Engineering Department, University of California, Berkley, California, USA

Authors and Affiliations

  1. International Centre for Theoretical Physics, Trieste, Italy

    M. E. Kassem, A. M. El-Khatib, E. A. Ammar & M. M. Denton

  2. Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt

    A. M. El-Khatib, E. A. Ammar & M. M. Denton

Authors
  1. M. E. Kassem
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  2. A. M. El-Khatib
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  3. E. A. Ammar
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  4. M. M. Denton
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Additional information

The authors are much indebted to Prof. Dr. B. Hilczer, Visiting Professor at the Physics Department, Alexandria University, from the Institute of Molecular Physics, Polish Academy of Sciences, for her valuable comments and cooperation. They are also grateful to Professor S. G. Prussin, the members of the activation group of the Nuclear Engineering Department, California University, Berkley, California, for their valuable help in the course of irradiation and the Institute of Graduate Studies and Research for their cooperation. One of the authors (M.E.K.) would like to thank Prof. Abdus Salam, the International Atomic Energy Agency and UNESCO for hospitality at the International Centre for Theoretical Physics Trieste.

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Kassem, M.E., El-Khatib, A.M., Ammar, E.A. et al. Thermodynamic studies on the ferroelectric phase transition in neutron irradiated (LixK1−x)2SO4 crystals at high temperature. Journal of Thermal Analysis 37, 533–540 (1991). https://doi.org/10.1007/BF01913104

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  • DOI: https://doi.org/10.1007/BF01913104

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