Phase diagrams of incommensurate ferroelectric NH₄HSeO₄: phenomenological treatment

• Published in: Condensed Matter Physics
• Date: 2000
• ISSN: 1607-324X
• Main Authors: Kityk, A.V., Zadorozhna, A.V.
• Format: Article
• Language: English
• Published: Інститут фізики конденсованих систем НАН України 2000
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/120993
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Phase diagrams of incommensurate ferroelectric NH₄HSeO₄: phenomenological treatment / A.V. Kityk, A.V. Zadorozhna // Condensed Matter Physics. — 2000. — Т. 3, № 4(24). — С. 759-766. — Бібліогр.: 9 назв. — англ.

The phenomenological analysis of the pressure-temperature (P −T ) phase
 diagram of NH₄HSeO₄ crystals is presented. It is shown that the disagreement between the experimental results and the theory may be removed
 assuming that the coefficient of the Landau free-energy expansion κ at...