{"title":"ON THE THEORY OF EVAPORATION REFINING","authors":"A.I. Kravchenko","doi":"10.46813/2024-149-033","DOIUrl":"https://doi.org/10.46813/2024-149-033","url":null,"abstract":"The theory of sublimation and distillation refining, which takes into account the diffusion of impurities, is considered. The conceptual nature of the theory is noted due to the large number of parameters whose values are unknown.","PeriodicalId":510408,"journal":{"name":"Problems of Atomic Science and Technology","volume":"154 1-4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140490168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. G. Rudenkyi, V.I. Zmii, R.V. Kryvoshapka, M.F. Kartsev, O.O. Kornieiev, O.V. Kunchenko, Y. V. Kunchenko, T.P. Ryzhova, I.А. Liashenko, M.Y. Bredikhin
{"title":"RESEARCH ON THE PROCESSES OF FORMING HEAT-RESISTANT COATINGS USED TO PROTECT NIOBIUM FROM THE EFFECTS OF OXIDIZING ENVIRONMENTS AT ELEVATED TEMPERATURES","authors":"S. G. Rudenkyi, V.I. Zmii, R.V. Kryvoshapka, M.F. Kartsev, O.O. Kornieiev, O.V. Kunchenko, Y. V. Kunchenko, T.P. Ryzhova, I.А. Liashenko, M.Y. Bredikhin","doi":"10.46813/2024-149-158","DOIUrl":"https://doi.org/10.46813/2024-149-158","url":null,"abstract":"The article presents the results of research on the creation of heat-resistant coatings on niobium samples that provide protection against oxidation in air at temperatures Т = 1973 К. Heat-resistant coatings on niobium, obtained by processing in sodium chloride vapors in powders of the composition of [(20-25)Si+(20-24)ZrSi2+(20-24)HfB2+(30-35)MoSi2] wt.% at a temperature Т = 1300 0С for 6 h and subsequent borosilicification, were approbated. Such heat-resistant coatings provide protection against oxidation in the air for 4…6 h. Complex coating obtained by applying a layer of 20HfB2+20MoSi2+20ZrSi2+16TiB2+8.5Ni+8.5Zr+3B+4Si wt.% slip on the surface\u0000of the niobium sample and subsequent processing in the [(20-25)Si+(20-24)ZrSi2+(20-24)HfB2+(30-35)MoSi2] wt.% powder composition at Т = 1300 °С for 6 h. The final stage of heat-resistant coating formation was borosilicification. Such a coating provides protection against the influence of an oxidizing environment for 6…10 h.\u0000Another method of creating a protective layer was the preliminary vanadium of the surface of the niobium sample followed by complex chemical and thermal treatment. This coating protects against oxidation for 10…12 h.","PeriodicalId":510408,"journal":{"name":"Problems of Atomic Science and Technology","volume":"72 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140486300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Ghaleb, Y. Benkrima, Asia Qadir Ahmed, Zahraa Talib Ghaleb
{"title":"STRUCTURAL, ELECTRONIC, AND OPTICAL PROPERTIES INVESTIGATION OF ZnSe CUBIC SPHALERITE COMPOUNDS USING DENSITY FUNCTIONAL THEORY (DFT)","authors":"A. Ghaleb, Y. Benkrima, Asia Qadir Ahmed, Zahraa Talib Ghaleb","doi":"10.46813/2024-149-103","DOIUrl":"https://doi.org/10.46813/2024-149-103","url":null,"abstract":"Theoretical investigation of the structural, elastic, electronic and optical properties of ZnSe using the plane-wave pseudo potential formalism method of density functional theory with local density approximation (LDA) and generalized gradient approximation (GGA) as exchange-correlation potentials (DFT). The optimal structure of the binary semiconductor ZnSe crystallized in the complex phase of sphalerite was determined by studying the energy as a function of the basic unit volume. The calculated equilibrium lattice constants, bulk moduli and volumes are in reasonable agreement with the available experimental results. The electronic and chemical bonding properties were investigated by calculating the band structure, density of states and Mulliken population. We found that for ZnSe,\u0000the band gap of LDA is 1.33 eV and that of GGA is 1.34 eV. In addition, optical properties (absorption coefficients) were calculated.","PeriodicalId":510408,"journal":{"name":"Problems of Atomic Science and Technology","volume":"48 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140487468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"ON DEPENDENCE OF EFFECCTIVE SEPARATION FACTOR ON DEGREE OF DISTILLATION","authors":"A.I. Kravchenko","doi":"10.46813/2024-149-029","DOIUrl":"https://doi.org/10.46813/2024-149-029","url":null,"abstract":"By using the example of the experimental data of the distillation of Pb-Sb (with Pb as the base) it is shown that the efficiency of distillation purification can be determined not only by the dependence of the effective separation factor on the degree of distillation, in the known distillation equation, but also by two others parameters: the equilibrium separation factor and the Peclet number.","PeriodicalId":510408,"journal":{"name":"Problems of Atomic Science and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140489614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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