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Article
Comparative analysis of the structure and electrical properties of single crystal and ceramic (ZrO2)0.90(Sc2O3)0.09(Yb2O3)0.01 solid electrolyte
Ceramics with the composition of (ZrO2)0.90(Sc2O3)0.09(Yb2O3)0.01 was obtained by tape casting onto a moving substrate using the original powder obtained by grinding single crystals. The phase composition, crysta...
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Article
Thermal conductivity of Y2O3-stabilized ZrO2 cubic single crystals: effects of defect structure
Yttria-stabilized zirconia is one of the most widely used solid electrolyte materials for solid oxide fuel cells (SOFCs) as well as solid oxide electrolysis cells (SOECs). The crystalline, defect structure, an...
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Article
Solid electrolytes based on zirconium dioxide partially stabilized with oxides of yttrium, gadolinium, and samarium
The phase composition, structure, conductivity, crack resistance, and microhardness of crystals (ZrO2)1-x(R2O3)x, where R = Y, Gd, Sm, and (x = 0.03, 0.04, 0.05) were studied. Crystals were grown by directed crys...
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Article
Effect of the Temperature-Rate Regimes in Electric Pulse Plasma Sintering on Microstructure and Mechanical Properties of Aluminum Oxide: The Role of Sintering Mechanisms
The temperature and heating rate affecting the shrinkage kinetics are studied for cylindrical workpieces obtained from submicron and fine aluminum oxide powder. The studies involve the powder from three batche...
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Article
Electropulse (Spark) Plasma Sintering of Ultrafine-Grained WC–Al2O3 Ceramics
The sintering mechanisms of WC–Al2O3 nanopowder compositions with different contents of al-umina particles (1, 3, and 5 wt %) have been studied. The samples of WC–Al2O3 ceramics are obtained by electropulse (spar...
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Article
Dynamic Strength of a Fine-Grained Alumina Ceramic Obtained by Spark Plasma Sintering
Dynamic compressive tests of alumina samples with different grain sizes obtained by spark plasma sintering (SPS) of submicron- and micron-sized α-Al2O3 powders have been performed. The effect of heating rate (Vh)...
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Article
Preparation of Ultrafine-Grained WC–ZrO2 Ceramics by Spark Plasma Sintering
WC–(1, 3, 5)% ZrO2 ceramics have been produced by spark plasma sintering (SPS). WC–ZrO2 powder mixtures have been prepared by ultrasonic homogenization and stirring of WC nanopowder and submicron t-ZrO2 powder. T...
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Article
Microstructure of Ultrafine-Grained Al2O3–ZrO2 Ceramics Produced by Two-Step Spark Plasma Sintering
We have studied the effect of monoclinic ZrO2 additions (1.5, 5, and 10 vol %) on the shrinkage kinetics of submicron α-Al2O3 powder. Ceramic samples were prepared by two-step spark plasma sintering (SPS). It has...
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Article
Interaction of Calcium and Strontium Carbonates with KF Solutions
The conversion of powdery MCO3 (M = Ca or Sr) to the metal fluoride by reacting it with potassium fluoride in solution was studied. The chosen reaction conditions produce single-phase calcium fluoride and stronti...
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Article
Structure and Transport Characteristics of Single-Crystal and Ceramic ZrO2–Y2O3 Solid Electrolytes
Directionally solidified single crystals of (ZrO2)1 – x(Y2O3)x solid solutions (x = 0.08–0.12) are grown. The effect of the concentration of the stabilizing yttrium oxide on the transport characteristics of the Z...
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Article
Platinum nanoparticles supported on nitrogen-doped carbons as electrocatalysts for oxygen reduction reaction
Behavior of Pt/C catalysts obtained by the platinum deposition on standard and nitrogen-doped carbon supports with different microstructure has been studied in the oxygen electroreduction reaction in an acidic...
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Article
Influence of the Sn-Oxide-Carbon Carrier Composition on the Functional Characteristics of Deposited Platinum Electrocatalysts
The effect of the SnO2 nanoparticles content on the structure and electrochemical behavior of Pt/(SnO2/C) catalysts containing about 20 wt% Pt was studied. In this case, SnO2/C nanostructured materials were obtai...
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Article
Phenomenon of Reversion after Aging in Magnesium Alloys with Gadolinium and Samarium
The parameters of reversion after hardening aging of magnesium alloys containing two rare earth metals gadolinium (yttrium group) and samarium (cerium group) were determined at various ratios of their contents...
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Article
ZrO2–Sc2O3 Solid Electrolytes Doped with Yb2O3 or Y2O3
The effects of the Y2O3 and Yb2O3 co-do** impurities on the transport characteristics and stabilization of the cubic phase in solid solutions based on ZrO2–Sc2O3 were compared. The crystals of the (ZrO2)0.99 –x
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Article
Features of β-Phase Decay in Ti–22Nb–6Zr Alloy
Abstract—A compact powder Ti–22Nb–6Zr alloy was obtained by powder metallurgy methods. The initial alloy powder was synthesized by the calcium hydride method. It was shown that, after consolidation during vacuum ...
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Article
Structural, Mechanical, and Transport Properties of Scandia and Yttria Partially Stabilized Zirconia Crystals
Crystals of (ZrO2)1 –x – y(Sc2O3)x(Y2O3)y (x = 0.003–0.045, y = 0.005–0.03) solid solutions have been grown by directional solidification in a cold crucible. All of the crystals consist of a mixture of two tetrag...
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Article
Gold nanoparticles in reverse micellar solutions: preparation, optical properties, and dimensional characteristics
Gold nanoparticles (NPs) were synthesized via chemical (Chem) and radiation-chemical (RadChem) methods for the reduction of ions in reverse micellar solutions (RMS). The gold NP have for the first time been obtai...
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Article
Synthesis of PtCu/С Electrocatalysts with Different Structures and Study of Their Functional Characteristics
PtCu/C electrocatalysts with similar compositions but different distributions of components in bimetallic nanoparticles were obtained by simultaneous and sequential reduction of copper(II) and platinum( IV) in...
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Article
Effect of the Composition and Structure of Pt(Cu)/C Electrocatalysts on Their Stability under Different Stress Test Conditions
Stability is one of the most important characteristics of electrocatalysts used in low-temperature fuel cells with a proton exchange membrane. The corrosion-morphological stability of supported electrocatalyst...
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Article
Activity and Stability of Pt/C and Pt-Cu/C Electrocatalysts
Stability in the course of exploitation and catalytic activity in reactions, taking place on the electrodes, are the most important characteristics of electrocatalysts that determine their application in fuel ...