State Research and Design Institute of Rare Metal Industry Giredmet

Moscow, Russia

State Research and Design Institute of Rare Metal Industry Giredmet

Moscow, Russia
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Koshel' E.S.,National University of Science and Technology "MISIS" | Baranovskaya V.B.,National University of Science and Technology "MISIS" | Gubanova T.Y.,State Research and Design Institute of Rare Metal Industry Giredmet
Inorganic Materials | Year: 2016

The analytical potential of direct arc atomic emission detection of impurities in rare earth oxides (Y2O3, Cd2O3, and Nd2O3) on a Grand-Extra high-resolution spectrometer (VMK-Optoelektronika, Russia) is assessed. The conditions of analysis and spectrometer parameters are optimized. The detection threshold and lower limits for the content of a number of rare earth elements (Nd, Eu, Dy, Ho, Gd, Er, Tm, Yb, and Y) in these oxides are determined. The procedure for direct arc atomic emission analysis of yttrium, gadolinium, and neodymium oxides to detect rare earth impurities within the range of 0.001–0.1 wt % is elaborated; the procedure is characterized by improved metrological parameters compared to the standard method. © 2016, Pleiades Publishing, Ltd.


Golubyatnikov V.A.,National Research University Higher School of Economics | Lysenko A.P.,State Research and Design Institute of Rare Metal Industry GIREDMET | Belov A.G.,State Research and Design Institute of Rare Metal Industry GIREDMET | Kanevskii V.E.,State Research and Design Institute of Rare Metal Industry GIREDMET
Semiconductors | Year: 2016

The galvanomagnetic Van der Pau measurements are carried out on single-crystalline CdxHg1−xTe (MCT) bulk samples and CdxHg1 − xTe/Cd1 − yZnyTe (MCT/CZT) (x ≈ 0.2) epitaxial heterostructures at the temperature of 295 and 77 K. The sample rotates together with the cryostat in the electromagnet field through the angle from 0° to 360° with the step of 6°. It is shown that the angular dependences of the voltage under measurement are sinusoidal for the p-MCT bulk sample at the temperatures of 77 K; i.e., the Hall coefficient is independent of the magnetic-field induction. However, the angular dependences of the measured signal appreciably differ from sinusoids for the MCT/CZT epitaxial heterostructures at the temperature of 77 K. © 2016, Pleiades Publishing, Ltd.


Eskina V.V.,National University of Science and Technology "MISIS" | Dalnova O.A.,National University of Science and Technology "MISIS" | Kareva E.N.,State Research and Design Institute of Rare Metal Industry Giredmet | Baranovskaya V.B.,National University of Science and Technology "MISIS" | Karpov Y.A.,RAS Kurnakov Institute of General and Inorganic Chemistry
Journal of Analytical Chemistry | Year: 2017

Method of sorption–atomic-absorption determination of Co, Cr, Cu, Fe, Mn, and Ni in samples of high-purity Nb2O5 with heterochain S,N-containing sorbents was developed. The method is based on the sorption preconcentration of trace impurities followed by their determination by high-resolution continuum source graphite furnace atomic absorption spectrometry (HR CS GFAAS). Selectivity of three original inhouse synthesized S,N-containing heterochain sorbents was studied. The recoveries of Co, Cr, Cu, Fe, Mn, and Ni using heterochain sorbents OKS, MTH, and GLSH were 100, 80, and 76%, correspondingly. Sorbent “OKS”, which provided the quantitative recovery of trace impurities, was chosen for further research. The sorption conditions for chloride solutions of different acidities (0.1–3 M HCl) were studied and optimized. Using the conditions established for the sorption and HR CS GFAAS analysis, trace Co, Cr, Cu, Fe, Mn, and Ni were determined in high purity Nb2O5 with a relative error less than 5%. The trueness control of the obtained results is confirmed by the “added–found” method. The developed method allows us to determine concentrations of analytes: 0.02–0.20 ppm Co, 2.0–3.3 ppm Cr, 0.2–1.5 ppm Cu, 6.0–21.0 ppm Fe, 0.6–0.8 ppm Mn, and 2.8–3.5 ppm Ni. The proposed methodology can be successfully extended to the determination of various trace elements in other high-purity inorganic materials. © 2017, Pleiades Publishing, Ltd.


Kotlyarov V.I.,State Research and Design Institute of Rare Metal Industry Giredmet | Yuzhakova E.A.,State Research and Design Institute of Rare Metal Industry Giredmet | Beshkarev V.T.,State Research and Design Institute of Rare Metal Industry Giredmet | Ivanov V.V.,State Research and Design Institute of Rare Metal Industry Giredmet | Kozlov R.Y.,State Research and Design Institute of Rare Metal Industry Giredmet
Metallurgist | Year: 2017

The change in morphology of polygonal powder in a low-temperature plasma generated in an arc discharge is an effective means for resolving the problem of preparing titanium alloy powder of spherical shape used in additive technology. A method is studied for preparing spherical powder of titanium and its alloys by spheroidization in streams of a polygonal powder thermal plasma, prepared by hydrogenation-dehydrogenation. A production scheme is proposed for preparing spherical titanium alloy powder for additive technology, including remelting of certified waste, ingot hydrogenation, crushing, screening its fractions, dehydrogenation, and gas centrifugal classification with final plasma treatment. A technology is developed for preparing spherical titanium alloy powder used in additive technology, with a reduced dissolved gas content. Methods are considered for improving the quality of spheroidized titanium powder including: minimization of the amount of particles with size less than 10 μm in the original polygonal powder, a change in composition of the plasma-forming gas, and prevention of contact with air by powder before and after spheroidization. © 2017 Springer Science+Business Media New York


Baranovskaya V.B.,State Research and Design Institute of Rare Metal Industry Giredmet | Karpov Yu.A.,State Research and Design Institute of Rare Metal Industry Giredmet
Measurement Techniques | Year: 2011

The main requirements laid down in domestic and overseas standard documents for metrological provision of the activity of analytical laboratories are demonstrated on the example of the Giredmet analytical service. A comprehensive approach is considered for organizing the analytical service activity using a laboratory information management system and its role in metrological provisions. Results are summarized for modernization of a set of chemical analysis procedures for nonferrous, rare, and precious metals, high purity substances based upon them, nanomaterials, and semiconductors. © 2011 Springer Science+Business Media, Inc.


Medvedevskikh S.V.,Ural Research Institute of Metrology | Medvedevskikh M.Y.,Ural Research Institute of Metrology | Karpov Y.A.,State Research and Design Institute of Rare Metal Industry Giredmet
Measurement Techniques | Year: 2015

We present a model to estimate the uncertainty of results in reproducing units of water content in solid and liquid substances and materials. An algorithm is described for implementing this approach. By using direct thermogravimetric and chemical methods, sources of uncertainty are clarified. We present composition, scope of application, and metrological characteristics of the State Primary Sstandard of mass fraction and mass (molar) concentration of water in solid and liquid substances and materials GET 173-2013. © 2015, Springer Science+Business Media New York.


Kostyuchenko V.Y.,Novosibirsk State Technical University | Protasov D.Y.,RAS Semiconductor Physics Institute | Andrusov Y.B.,State Research and Design Institute of Rare Metal Industry Giredmet | Denisov I.A.,State Research and Design Institute of Rare Metal Industry Giredmet | Voitsekhovskii A.V.,Tomsk State University
Russian Physics Journal | Year: 2016

Photoconductivity in a magnetic field is studied for Faraday geometry on the p-type cadmium – mercury –tellurium films grown by liquid-phase epitaxy on cadmium – zinc – tellurium substrates. From the magnetic-field dependence of the photoconductivity signal under the film illumination from the side of the substrate or from the side of free surface, different values of mobility of minority carriers (electrons) are obtained. It is shown that for the mathematical description of the photoconductivity signal in a magnetic field, two types of electrons – “fast” and “slow” electrons, as well as “heavy” holes can be used. © 2016, Springer Science+Business Media New York.


Shneider B.V.,State Research and Design Institute of Rare Metal Industry Giredmet | Alekseeva T.Y.,National University of Science and Technology "MISIS" | Karpov Y.A.,National University of Science and Technology "MISIS"
Journal of Analytical Chemistry | Year: 2015

We investigated sources of errors in gravimetric and combined spectral–gravimetric methods for the determination of platinum and palladium in multicomponent materials. A general methodological approach is proposed to the development of precise combined procedures for determining platinum and palladium in materials of complex composition. Procedures for the spectral–gravimetric determination of platinum and palladium in industrial preconcentrates with a weight fraction of platinum of 70–90% and palladium of 45–80% are developed and their performance characteristics are evaluated: the error ranges (±Δ, wt %) are 0.15–0.20 for platinum and 0.20–0.30 for palladium, which is not inferior and, in some cases, superior to the accuracy of conventional gravimetric analysis. The proposed procedures are less cumbersome and time consuming compared to the multistage gravimetric analysis. © 2015, Pleiades Publishing, Ltd.


Belogorokhov I.A.,State Research and Design Institute of Rare Metal Industry Giredmet | Kotova M.S.,Moscow State University | Donskov A.A.,State Research and Design Institute of Rare Metal Industry Giredmet | Dronov M.A.,State Research and Design Institute of Rare Metal Industry Giredmet | Belogorokhova L.I.,Moscow State University
Crystallography Reports | Year: 2016

The effect of charge memory in composites based on polymer molecules has been investigated. Resistive switchings in sandwich samples prepared by lamination from commercially available polymers (polystyrene and poly(2,3-dihydrothieno-1,4-dioxine)-poly(styrene sulphonate) are analyzed. It is shown that the characteristic switching times in the composite samples reach several nanoseconds and the number of switchings exceeds 106. Switchings are observed in electric fields much below the breakdown threshold, which indicates the absence of destructive processes in the polymer. © 2016, Pleiades Publishing, Inc.


Muravyeva I.V.,National University of Science and Technology "MISIS" | Bebeshko G.I.,State Research and Design Institute of Rare Metal Industry Giredmet
Inorganic Materials | Year: 2014

The potentiometric determination of fluoride with the use of an Cyrillic capital letter EKOM-F ion-selective electrode in red muds (waste of aluminum production) is described. The accuracy of ionometric determination of fluorine is estimated. The results are supported by the "added-found" method and the method of varying the sample weight, as well as by a comparison with the results obtained by an independent procedure. © 2014 Pleiades Publishing, Ltd.

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