Abstract
The results of model cluster expansion for qualitative description of thermodynamics of a structural phase transition and other properties and for elucidation of the effect of domain boundaries were analyzed within the framework of the Ising model in the single-domain cluster approximation with independent quantum chemical determination of all required pseudospin Hamiltonian parameters. For a number of dimeric model clusters, it was shown that their application for the KDP/DKDP crystals in the first case is of low use. The key result about fundamental changes in the electronic spectrum of the H-bonded subsystem in all studied dimeric clusters obtained by various calculations methods can be used to map out a plan for modeling a more realistic structure of domain boundaries with subsequent analysis of the obtained data by different statistical methods.
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Funding
The study was supported by the Russia Foundation for Basic Research (project No. 19-03-00443) and was partly performed within the state assignment of the Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, in the field of fundamental research (No. 44.2).
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Translated by Z. Svitanko
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Dolin, S.P., Mikhailova, T.Y. & Breslavskaya, N.N. The Effect of Model Cluster Expansion on the Results of Microscopic Description of the Properties of KDP type H-Bonded Ferroelectrics. Russ. J. Inorg. Chem. 65, 540–545 (2020). https://doi.org/10.1134/S0036023620040221
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DOI: https://doi.org/10.1134/S0036023620040221