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Information × Registration Number 0226U001698, (0125U000228) , R & D reports Title Study of acid-base and redox interactions in zinc sulfide (oxide)–rare-earth element fluoride systems for the development of interference optics materials in the IR spectral range. popup.stage_title Прогнозування механізму взаємодії у системах сульфід (оксид) Цинку–фториди рідкісноземельних елементів на основі концепцій кислотності-основності та стабілізації валентних станів, а також термодинамічних розрахунків. Розробка методів речовинного хімічного аналізу, а також аналітичного контролю сполук. Head Zinchenko Viktor F., Доктор хімічних наук Registration Date 29-01-2026 Organization Physico-Chemical Institute O. Bogatsky National Academy of Sciences of Ukraine popup.description1 Establishing the mechanisms of acid-base and redox interactions of Zinc sulfide and oxide impurities with fluorides of rare earth elements, which occurs at high temperatures in an inert environment (argon, helium) and deep vacuum with the formation of thin-film coatings transparent in the infrared range of the spectrum for interference optics. popup.description2 ZINC SULFIDE, ZINC OXIDE, LANTHANIDE FLUORIDE, ACID-BASE INTERACTION, PREDICTION, ELECTRONEGATIVITY OF COMPOUNDS The object of the study is the interaction between Zinc sulfide with an oxide impurity - on the one hand and lanthanide fluorides - on the other; prediction, interaction based on the concept of acidity-basicity (electronegativity) and thermodynamic calculations of processes. The aim of the work is to identify systems that are optimal in composition and capable of thermal evaporation in vacuum with the formation of thin-film coatings. The prediction of acid-base interaction in systems of mixed composition, namely ZnS(ZnO)–LnF3 (Ln – Y, La ÷ Lu), was carried out, based on the principles of electronegativity of compounds, as well as using thermodynamic calculations of exchange reactions in the specified systems. It was established that the double ion exchange reaction scheme is valid for all lanthanide fluorides, except for ZnS–EuF3, in which a redox reaction is predicted in addition to the exchange reaction. The probability of exchange reactions in systems with ZnO is significantly higher compared to that for ZnS, which is associated with the greater basicity of the first of the compounds. Comparison of the long-wavelength boundaries of the transparency regions of rare-earth element (REE) fluorides with the corresponding data for sulfides confirms the bathochromic specific shift of the transparency region of sulfides relative to fluorides, which is due to the contradictory influence on them of the kinetic and dimensional-energy parameters of metal-nonmetal bonds in the compounds. The phase transition parameters, in particular, the operating temperatures of REE fluorides and ZnO and ZnS, were estimated. It is planned to establish the mechanism of interaction between components at high temperature and deep vacuum, as well as further optimization of the process and the prospect of practical application of materials for interference optics. Product Description popup.authors Mahunov Ihor R. Zseltvai Ivan І. Tesluk Olga І. Doha Pavlo H. Stamikosto Olena V. Kucher Albert O. Babenko Anton V. Zinchenko Viktor F. Svitlana V. Tsygankova popup.nrat_date 2026-01-29 Close