-
Article
Composition of Impurities of Germanium Tetrafluoride: A Gas Chromatography–Mass Spectrometry Study
The compositions of impurities of GeF4 with natural isotopes and GeF4 enriched isotopically were studied for the first time with a chromatography-mass spectrometry on adsorption capillary columns. Their prelimina...
-
Article
Isotopically Enriched Silicon, Germanium, and Their Hydrides for Quantum Computer Development
In this paper, we report the preparation of high-purity 28Si silicon and 72Ge germanium isotopes and their volatile hydrides with controlled concentrations of the 29Si and 73Ge nonzero nuclear spin isotopes for p...
-
Article
28SiO2-Based Isotopically Enriched Silica Fiber
A silica fiber preform with a reflective cladding and 28SiO2-based isotopically enriched core has been produced by modified chemical vapor deposition (MCVD) using high-purity 28Si-enriched silicon tetrachloride. ...
-
Article
Prospects for the Development of Methods for the Analysis of High-Purity Volatile Substances
This review is devoted to the consideration of prospects and directions for the development of methods and approaches to the analysis of high-purity industrial gases and volatile hydrides, chlorides, fluorides...
-
Article
Study of the Impurity Composition of Isotopically Enriched Germane 70GeH4 by Gas Chromatography–Mass Spectrometry
The impurity composition of isotopically enriched germane 70GeH4 was studied for the first time by gas chromatography–mass spectrometry. Impurities were separated using capillary adsorption columns: GS-GasPro (60...
-
Article
Preparation of High-Purity Silicon-28 Tetrachloride from Silicon-28 Tetrafluoride
Interaction between silicon tetrafluoride and aluminum(III) chloride in the form of SiF4 → SiClF3 → SiCl2F2 → SiCl3F → SiCl4 sequential reactions in a closed reactor has been studied in the temperature range 473–...
-
Article
Preparation of Single-Crystal Isotopically Enriched 70Ge by a Hydride Method
Single-crystal 70Ge germanium with high isotopic and chemical purity has been prepared by a hydride method. Germanium isotopes have been separated by centrifugation with the use of monogermane as a starting volat...
-
Article
Effect of the Isotopic Composition of Fe on the Kinetics of Its α → γ Phase Transition
Using differential scanning calorimetry, we have examined the effect of isotopic composition on the temperature and kinetics of the α → γ phase transition of isotopically natural (natFe), 56Fe-enriched, and 57Fe-...
-
Article
Effect of the Isotopic Composition of Fe on Its Linear Thermal Expansion Coefficient
The linear thermal expansion coefficients (LTECs) of isotopically natural Fe (natFe) and samples isotopically enriched in 56Fe (99.945 wt %) and 57Fe (90.954 wt %) have been determined as functions of temperature...
-
Article
Thermal Structure of the Filtration Combustion Wave of CаH2 in a Flow of a SiF4 + H2 Mixture
The head and wake waves of filtration combustion of calcium hydride in a flow of a mixture of silicon tetrafluoride and hydrogen at silicon tetrafluoride weight fractions of 0.8, 0.85, 0.9, and 0.98 were studi...
-
Article
An Effect of the Reagent Concentration in the Flow of a Gas Mixture on the Parameters of the Combustion Wave of CaH2 in SiF4
The dependence has been investigated of the maximum temperature in the reaction front, the linear velocity of the combustion wave of CaH2 in a mixture of gases SiF4 and H2 with the formation of SiH4, and the conv...
-
Article
Analysis of High-Purity Silane of Natural and Isotopically Enriched Composition by Gas Chromatography–Mass-Spectrometry
The impurity composition of natural and isotopically enriched silane obtained from magnesium silicide and silicon tetrafluoride is studied by gas chromatography–mass-spectrometry. The impurities characteristic...
-
Article
Preparation of Isotopically Enriched Polycrystalline Germanium via Monogermane Pyrolysis
High-purity isotopically enriched germanium has been prepared by a hydride method, and the main factors capable of reducing the germanium yield in the monogermane pyrolysis process have been identified. To rai...
-
Article
Isotopic Analysis of Highly Enriched Crystalline 28Si and Initial 28SiF4 by High-Resolution Inductively Coupled Plasma Mass Spectrometry
A procedure is described for determining the isotopic composition of highly enriched silicon as elementary 28Si and initial 28SiF4 by a single collector double focusing sector field ICP MS over a wide range of is...
-
Article
Modeling Iron Pentacarbonyl Ultrapurification in a Vertical Distillation Apparatus
This paper presents a mathematical model for the ultrapurification of substances via distillation in a closed vaporization–condensation system, where vapor condenses on a flowing down liquid film. We jointly a...
-
Article
Study of the Stability of a Number of Molecular Impurities in Monosilane
Chromatography-mass-spectrometry was used to examine the stability of admixtures of C1−C7 hydrocarbons, fluorine and chlorinated derivatives of hydrocarbons, alkyl derivatives of silane, homologs of monosilane, a...
-
Article
Effect of Technological Parameters of Interaction between SiF4 and CaH2 on the Nature of Filtration Combustion
Interaction of silicon tetrafluoride and calcium hydride in a metallic vertical flow-through reactor in the filtration combustion mode was studied. It was shown that the stationary course of the process requir...
-
Article
Sources of Carbon Impurities in the Preparation of High-Purity Monoisotopic 28Si by a Hydride Method
This paper examines sources of carbon impurities in polycrystalline monoisotopic 28Si prepared by a hydride method. Analytical data on the concentrations of carbon-containing impurities in volatile silicon compou...
-
Article
Modeling Iron Pentacarbonyl Vaporization Accompanied by Vapor Condensation on a Flowing Down Liquid Film
Using iron pentacarbonyl distillation as an example, we analyze the vaporization process in a closed vaporization–condensation system where vapor condenses on a flowing down liquid film. We jointly analyze the...
-
Article
Liquid–Vapor Equilibria in the SiCl4–A (A = SiCl4–nFn (n = 1–4) Impurity) Systems
The vapor–liquid separation factors of SiCl4–A (A = SiCl4–nFn (n = 1–4) silicon fluorochloride impurities in silicon tetrachloride have been determined experimentally at 298 K by statically balancing phases. The ...
