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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.


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.


Petrov A.M.,State Research and Design Institute of Rare Metal Industry Giredmet | Klimova O.I.,State Research and Design Institute of Rare Metal Industry Giredmet | Dal'Nova O.A.,State Research and Design Institute of Rare Metal Industry Giredmet | Karpov Yu.A.,State Research and Design Institute of Rare Metal Industry Giredmet
Inorganic Materials | Year: 2014

The possibility of group concentration for subsequent arc atomic emission analysis (AAEA) with a multichannel emission spectra analyzer (MESA) aimed at determining trace amounts of platinum metals (PMs) and gold in secondary and technogenic materials using commercial or newly synthesized (via the thiomethylation reaction) sorbents containing nitrogen and sulfur was studied. The conditions for sorption concentration of PMs and gold were determined. The sample preparation method and the conditions for performing the MESA-assisted AAEA of the sorption concentrate were chosen. The impurity detection limits were determined. The possibility of determining the elements at the 10-4-10-5 wt % level was demonstrated. The validity of the results was checked by varying the sample weight and by conducting a comparative experiment with the use of different methods. The other two methods used in this experiment were atomic absorption spectrometry and inductively coupled plasma atomic emission spectrometry. © 2014 Pleiades Publishing, Ltd.


Shneider B.V.,State Research and Design Institute of Rare Metal Industry Giredmet | Malyutina T.M.,State Research and Design Institute of Rare Metal Industry Giredmet | Alekseeva T.Yu.,OOO Anserteko Analytical | Karpov Yu.A.,State Research and Design Institute of Rare Metal Industry Giredmet
Inorganic Materials | Year: 2014

Various techniques for decomposition of process concentrates with a high content of palladium, such as fusion with potassium pyrosulfate and dissolution in autoclaves, with the purpose of the following gravimetric determination of palladium are described. It is shown that the optimal method for transferring the sample into the solution is its dissolution in a mixture of HCl and HNO3 (3: 1) using analytical autoclaves. The conditions of the autoclave dissolution (the composition of the acid mixture, the temperature, and the dissolution time) are determined. The relative standard deviation of the analysis results is 0.3% for a content of palladium of 60-80%. © 2014 Pleiades Publishing, Ltd.


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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