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Three-dimensional phase diagram of a ferroelectric

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Abstract

On the basis of the molecular-dynamic theory, by phenomenologically generalizing the expression for the energy of a ferroelectric, an equation of state is derived here for a ferroelectric in electric field intensity as well as temperature and mechanical stress. The σ(mechanical stress) — T(temperature) phase diagram is analyzed, whereupon ths spinodal, the critical point, and the supercritical line extending into the low-temperature range are plotted. A superposition of this diagram with the E (electric field intensity) — T(temperature) diagram yields a three-dimensional phase diagram in all three state variables. Its elements are the spinodal surface, the critical line, and the supercritical surface bordering on the critical line.

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Authors and Affiliations

  1. Institute of Electronic Machine Design, Moscow

    V. Kh. Kozlovskii

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  1. V. Kh. Kozlovskii
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 64–68, June, 1975.

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Kozlovskii, V.K. Three-dimensional phase diagram of a ferroelectric. Soviet Physics Journal 18, 803–807 (1975). https://doi.org/10.1007/BF00891157

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  • DOI: https://doi.org/10.1007/BF00891157

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