STepwise Magnetic Behavior of the Liquid Crystal Iron(Iii) Complex

EPR and Mossbauer spectroscopy is used to study a new liquid crystal complex of iron(III) with a Schiff base: 4,4'S-dodecyloxybenzoyloxybenzoyl-4- oxysalicylidene-2-aminopyridine with a PF6'{ counterion. It is shown that Fe(III) ions exist only in the high-spin (HS, S = 5/2) state. It is found that under the influence of temperature the system demonstrates the stepwise behavior of the product of the integrated intensity of EPR lines (I ) and temperature (proportional to "where" is the magnetic susceptibility) with an inflection point at "80 K. Above 80 K a new EPR spectrum is detected due to the excited S = 2 state and the formation of dimeric molecules (through oxygen bridges) with a strong intramolecular antiferromagnetic exchange interaction J1 = 162.1 cm-V1. Below 80 K iron(III) complexes are organized in 1D chains where the exchange value J2 = 2.1 cm-V1. At 80 K there is a structural phase transition in the system: the transition from a 1D chain organization of HS Fe(III) centers to dimeric molecules. Based on quantum chemical calculations a model of the binuclear iron(III) complex is proposed. Copyright © 2013 by N. E. Domracheva, V. E. Vorob'eva, A. V. Pyataev, R. A. Manapov, E. M. Zueva, M. S. Gruzdev, U. V. Chervonova

Оценка влияния разложения твердого раствора алюминия на геометрическое строение изобарной фазовой диаграммы Al-Sn-Zn

Three-dimensional (3D) computer model of the Al-Sn-Zn isobaric phase diagram is presented. It is shown that the T-x-y diagram consists of 64 surfaces and 25 phase regions. Features of Al-Zn binary system phase diagram related to decomposition of aluminum solid solution and its influence on geometric structure of liquidus and solidus surfaces in the ternary system, formed by this binary system and tin, are considered. Critical analysis of the published data was carried out and errors in visualization of those fragments of the Al-Zn T-x diagram, in which phase regions are formed with the participation of new aluminum solid solutions, appeared after the decomposition of the initial solid solution, are discussed. To design this 3D model, literary data were used, and the assessment of its quality is based on isopleths and isothermal sections from the same primary sources.Представлена трехмерная (3D) компьютерная модель изобарной фазовой диаграммы Al-Sn-Zn. Показано, что T-x-y диаграмма состоит из 64 поверхностей и 25 фазовых областей. Рассмотрены особенности фазовой диаграммы двойной системы Al-Zn, связанные с распадом твердого раствора алюминия, и их влияние на геометрическое строение поверхностей ликвидуса и солидуса в тройной системе, формируемой этой системой при добавлении олова. Проведен критический анализ опубликованных данных и обсуждаются ошибки в визуализации тех фрагментов T-x диаграммы Al-Zn, в которых затрагиваются фазовые области, формируемые с участием новых твердых растворов алюминия, появившихся после распада исходного твердого раствора. Для построения 3D модели использовали литературные данные, а в основу оценки ее качества положены изо- и политермические разрезы из тех же первоисточников

3D компьютерная модель T-x-y диаграммы Ag-Cu-Ni: верификация разрезов в атласе фазовых диаграмм для бессвинцовых припоев

Spatial (three-dimensional - 3D) computer model of the T-x-y diagram of the Ag - Cu - Ni system, which is promising for the development of environmentally friendly solders, is presented. The model is constructed on the basis of published data on the binary systems forming this ternary system, the concentration projection of the liquidus surfaces, and four isothermal sections. It is shown that the phase diagram (PD) consists of 14 surfaces and 9 phase regions. The adequacy of the model is confirmed by comparing the isothermal sections and the liquidus projection.Представлена пространственная (трехмерная - 3D) компьютерная модель T-x-y диаграммы системы Ag-Cu-Ni, перспективной для разработки экологически безопасных припоев. Модель построена на основе опубликованных данных по формирующим эту тройную систему бинарным системам, концентрационной проекции поверхностей ликвидуса и четырем изотермическим разрезам. Показано, что фазовая диаграмма состоит из 14 поверхностей и 9 фазовых областей. Адекватность модели подтверждается сравнением изотермических разрезов и проекции ликвидуса

Development of the Immuno-Enzyme Test-System for the Detection of <i>Legionella pheumophila</i>, Serogroup I

Developed is the highly sensitive and specific immuno-enzyme test-system, which is perspective for the detection of L. pneumophilia, serogroup 1. Isolated are the three hybrid cell lines that secrete monoclonal antibodies to specific epitopes of L. pneumophilia, serogroup 1 lipopolysaccharide antigen. Hyper immune rabbit sera, characterized by highly specific activity and specificity, are obtained using lipopolysaccharide antigen

3D Computer Models of the Ag-Sb-Sn and MgO-Al₂O₃-SiO₂ T-x-y Diagrams

Three-dimensional (3D) computer models of Ag-Sb-Sn and MgO-Al₂O₃-SiO₂ systems T-x-y diagrams have been designed. For the metal system two versions of 3D model of its phase diagram have been constructed according to the contradictions in the temperature intervals of the compound Sb₂Sn₃ stability. Possibilities of the analysis of the stages of crystallization and prediction of microstructural constituents with the aid of the calculation of vertical mass balance diagrams are demonstrated on the basis of the 3D computer model for the oxide system

3D Computer Models of the Ag-Sb-Sn and MgO-Al 2

Three-dimensional (3D) computer models of Ag-Sb-Sn and MgO-Al₂O₃-SiO₂ systems T-x-y diagrams have been designed. For the metal system two versions of 3D model of its phase diagram have been constructed according to the contradictions in the temperature intervals of the compound Sb₂Sn₃ stability. Possibilities of the analysis of the stages of crystallization and prediction of microstructural constituents with the aid of the calculation of vertical mass balance diagrams are demonstrated on the basis of the 3D computer model for the oxide system