METHODOLOGY FOR THE DIGESTION OF GOLD-BEARING ORES WITH SULFIDE CARBONACEOUS MATRIX

The study describes the optimized protocol for the roasting of gold-bearing ore with sulfide carbonaceous matrix. STA 449F5 Jupiter thermal analyzer is used to record the DTA, TG and DTG curves in air. The proposed roasting protocol provides the full removal of sulfur and carbon after 3 hours.Работа выполнена в ЦКП «Геоаналитик» в рамках темы № 123011800012-9 государственного задания ИГГ УрО РАН

High-temperature studies of the magnetic susceptibility of samarium and the Al2Sm compound

This study was supported financially by the Russian Foundation for Basic Research (project no. 11-03-00469-a).The magnetic susceptibility of metallic samarium and the Al2Sm intermetallic compound has been experimentally studied by the Faraday method in the temperature range of 300-1800 K. It has been shown that the temperature dependences of the magnetic susceptibility of Sm and Al2Sm in a crystalline state can be described in the framework of Van Vleck paramagnetism theory taking into account variable valence and the contribution from the conduction electrons. Using this theoretical interpretation of the data, the effective valence of samarium in the metallic state and in the Al2Sm intermetallic compound has been estimated as a function of the temperature

High-temperature studies of the magnetic susceptibility of samarium and the Al2Sm compound

This study was supported financially by the Russian Foundation for Basic Research (project no. 11-03-00469-a).The magnetic susceptibility of metallic samarium and the Al2Sm intermetallic compound has been experimentally studied by the Faraday method in the temperature range of 300-1800 K. It has been shown that the temperature dependences of the magnetic susceptibility of Sm and Al2Sm in a crystalline state can be described in the framework of Van Vleck paramagnetism theory taking into account variable valence and the contribution from the conduction electrons. Using this theoretical interpretation of the data, the effective valence of samarium in the metallic state and in the Al2Sm intermetallic compound has been estimated as a function of the temperature

Magnetic susceptibility and parameters of electronic structure of al2rem (gd, dy, and ho) intermetallic compounds at high temperatures

This work was supported in part by the Special Federal Program NK-255-P/1 and Russian Foundation for Basic Research (grant No. 09-03-90450-Ukr).The magnetic susceptibility of Al2REM (REM = Gd, Dy, and Ho) intermetallic compounds is experimentally investigated by the Faraday method in a wide temperature interval (290-2000 K) in different magnetic fields (0.3-1.3 T). In the crystalline state, the temperature dependences of the susceptibility follow the generalized Curie-Weiss law. In the liquid phase, the magnetic susceptibility of these intermetallic compounds above the melting point increases for all examined samples. The parameters of the electronic structure of the compounds are calculated based on the experimental data. It is established that the effective magnetic moment per rare-earth metal atom is smaller than that characteristic of the free REM+ ion

Magnetic susceptibility of Al2RE compounds in crystal and liquid states

Project supported by RFBR (Grant N N 09-03-90450-Ukr) and FTP (NK-255P/1, NK-16P/1)Magnetic susceptibility of Al2RE (RE=Y, Ce, Sm, Gd, Dy, Ho, Yb) compounds was studied experimentally in wide temperature (T=290-2000 K) and field (B=0.3-1.3 T) intervals. The abnormal increase in susceptibility beginning above the melting point was fixed for all the compositions. The values for the effective magnetic moments per RE atoms in these compounds were found to be smaller than the values typical for free ions RE3+. The results were discussed in supposition of the directed bonds between aluminum and rare-earth atoms

Magnetic susceptibility of Al2RE compounds in crystal and liquid states

Project supported by RFBR (Grant N N 09-03-90450-Ukr) and FTP (NK-255P/1, NK-16P/1)Magnetic susceptibility of Al2RE (RE=Y, Ce, Sm, Gd, Dy, Ho, Yb) compounds was studied experimentally in wide temperature (T=290-2000 K) and field (B=0.3-1.3 T) intervals. The abnormal increase in susceptibility beginning above the melting point was fixed for all the compositions. The values for the effective magnetic moments per RE atoms in these compounds were found to be smaller than the values typical for free ions RE3+. The results were discussed in supposition of the directed bonds between aluminum and rare-earth atoms

Magnetic susceptibility and parameters of electronic structure of al2rem (gd, dy, and ho) intermetallic compounds at high temperatures

This work was supported in part by the Special Federal Program NK-255-P/1 and Russian Foundation for Basic Research (grant No. 09-03-90450-Ukr).The magnetic susceptibility of Al2REM (REM = Gd, Dy, and Ho) intermetallic compounds is experimentally investigated by the Faraday method in a wide temperature interval (290-2000 K) in different magnetic fields (0.3-1.3 T). In the crystalline state, the temperature dependences of the susceptibility follow the generalized Curie-Weiss law. In the liquid phase, the magnetic susceptibility of these intermetallic compounds above the melting point increases for all examined samples. The parameters of the electronic structure of the compounds are calculated based on the experimental data. It is established that the effective magnetic moment per rare-earth metal atom is smaller than that characteristic of the free REM+ ion

Effect of synthesis route on structure and properties of AlCoCrFeNi high-entropy alloy

A series of equatomic AlCoCrFeNi alloys prepared through various synthesis techniques is systematically investigated in the temperature range from 4 K to 1400 K. In this paper we consider their crystalline structure, microstructure, thermo-physical, electron-transport and magnetic properties. Phase transformations, Curie point and also the region for s-phase existence are accurately determined in the system. A mixture of both body centered cubic (BCC) and face centered cubic (FCC) crystal structures is identified in all samples. Depending on synthesis conditions, BCC or FCC solid solution dominates that induces large variations in the properties of the alloys. (C) 2016 Elsevier Ltd. All rights reserved

Effect of synthesis route on structure and properties of AlCoCrFeNi high-entropy alloy

A series of equatomic AlCoCrFeNi alloys prepared through various synthesis techniques is systematically investigated in the temperature range from 4 K to 1400 K. In this paper we consider their crystalline structure, microstructure, thermo-physical, electron-transport and magnetic properties. Phase transformations, Curie point and also the region for s-phase existence are accurately determined in the system. A mixture of both body centered cubic (BCC) and face centered cubic (FCC) crystal structures is identified in all samples. Depending on synthesis conditions, BCC or FCC solid solution dominates that induces large variations in the properties of the alloys. (C) 2016 Elsevier Ltd. All rights reserved

Effect of synthesis route on structure and properties of AlCoCrFeNi high-entropy alloy

A series of equatomic AlCoCrFeNi alloys prepared through various synthesis techniques is systematically investigated in the temperature range from 4 K to 1400 K. In this paper we consider their crystalline structure, microstructure, thermo-physical, electron-transport and magnetic properties. Phase transformations, Curie point and also the region for s-phase existence are accurately determined in the system. A mixture of both body centered cubic (BCC) and face centered cubic (FCC) crystal structures is identified in all samples. Depending on synthesis conditions, BCC or FCC solid solution dominates that induces large variations in the properties of the alloys. (C) 2016 Elsevier Ltd. All rights reserved