Formation and Physicochemical Properties of High Entropy Oxide Based on Equiatomic Alloy CrFeCoNiMn

2019 ◽  
Vol 41 (1) ◽  
pp. 38-42 ◽  
Author(s):  
V. F. Gorban’ ◽  
A. A. Andreev ◽  
A. M. Chikryzhov ◽  
M. V. Karpets ◽  
N. A. Krapivka ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
High Entropy ◽  
Equiatomic Alloy

Synthesis of a single phase of high-entropy Laves intermetallics in the Ti–Zr–V–Cr–Ni equiatomic alloy

2017 ◽  
Vol 97 (12) ◽  
pp. 494-503 ◽  
Author(s):  
T. P. Yadav ◽  
Semanti Mukhopadhyay ◽  
S. S. Mishra ◽  
N. K. Mukhopadhyay ◽  
O. N. Srivastava
Keyword(s):  
Single Phase ◽  
High Entropy ◽  
Equiatomic Alloy

scholarly journals Formation of Solid Solutions and Physicochemical Properties of the High-Entropy Ln1−xSrx(Co,Cr,Fe,Mn,Ni)O3−δ (Ln = La, Pr, Nd, Sm or Gd) Perovskites

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5264
Author(s):  
Juliusz Dąbrowa ◽  
Klaudia Zielińska ◽  
Anna Stępień ◽  
Marek Zajusz ◽  
Margarita Nowakowska ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Physicochemical Properties ◽  
Solid Solutions ◽  
Pechini Method ◽  
Solubility Limit ◽  
Secondary Phases ◽  
Chemical Expansion ◽  
High Entropy ◽  
Total Electrical Conductivity ◽  
Rhombohedral Crystal Structure

Phase composition, crystal structure, and selected physicochemical properties of the high entropy Ln(Co,Cr,Fe,Mn,Ni)O3−δ (Ln = La, Pr, Gd, Nd, Sm) perovskites, as well as the possibility of Sr doping in Ln1−xSrx(Co,Cr,Fe,Mn,Ni)O3−δ series, are reported is this work. With the use of the Pechini method, all undoped compositions are successfully synthesized. The samples exhibit distorted, orthorhombic or rhombohedral crystal structure, and a linear correlation is observed between the ionic radius of Ln and the value of the quasi-cubic perovskite lattice constant. The oxides show moderate thermal expansion, with a lack of visible contribution from the chemical expansion effect. Temperature-dependent values of the total electrical conductivity are reported, and the observed behavior appears distinctive from that of non-high entropy transition metal-based perovskites, beyond the expectations based on the rule-of-mixtures. In terms of formation of solid solutions in Sr-doped Ln1−xSrx(Co,Cr,Fe,Mn,Ni)O3−δ materials, the results indicate a strong influence of the Ln radius, and while for La-based series the Sr solubility limit is at the level of xmax = 0.3, for the smaller Pr it is equal to just 0.1. In the case of Nd-, Sm- and Gd-based materials, even for the xSr = 0.1, the formation of secondary phases is observed on the SEM + EDS images.

scholarly journals Microstructure and Mechanical Properties of Precipitate Strengthened High Entropy Alloy Al10Co25Cr8Fe15Ni36Ti6 with Additions of Hafnium and Molybdenum

Entropy ◽  
2019 ◽  
Vol 21 (2) ◽  
pp. 169 ◽  
Author(s):  
Sebastian Haas ◽  
Anna M. Manzoni ◽  
Fabian Krieg ◽  
Uwe Glatzel
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperatures ◽  
Base Alloy ◽  
Tensile Tests ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Positive Effects ◽  
High Temperature Materials ◽  
Equiatomic Alloy

High entropy or compositionally complex alloys provide opportunities for optimization towards new high-temperature materials. Improvements in the equiatomic alloy Al17Co17Cr17Cu17Fe17Ni17 (at.%) led to the base alloy for this work with the chemical composition Al10Co25Cr8Fe15Ni36Ti6 (at.%). Characterization of the beneficial particle-strengthened microstructure by scanning electron microscopy (SEM) and observation of good mechanical properties at elevated temperatures arose the need of accomplishing further optimization steps. For this purpose, the refractory metals hafnium and molybdenum were added in small amounts (0.5 and 1.0 at.% respectively) because of their well-known positive effects on mechanical properties of Ni-based superalloys. By correlation of microstructural examinations using SEM with tensile tests in the temperature range of room temperature up to 900 °C, conclusions could be drawn for further optimization steps.

scholarly journals Mechanochemical Synthesis of (Co,Cu,Mg,Ni,Zn)O High-Entropy Oxide and Its Physicochemical Properties

2019 ◽  
Vol 48 (11) ◽  
pp. 7105-7113 ◽  
Author(s):  
Mateusz Balcerzak ◽  
Kenichi Kawamura ◽  
Rafał Bobrowski ◽  
Paweł Rutkowski ◽  
Tomasz Brylewski
Keyword(s):  
Physicochemical Properties ◽  
Mechanochemical Synthesis ◽  
High Entropy

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

Studies on the Degradation of Human Fibrinogen by Plasmin and Trypsin

1966 ◽  
Vol 16 (03/04) ◽  
pp. 526-540 ◽  
Author(s):  
E. A Beck ◽  
D. P Jackson
Keyword(s):  
Physicochemical Properties ◽  
Electrophoretic Mobility ◽  
Rapid Loss ◽  
Clotting System ◽  
Human Fibrinogen ◽  
Peptide Bonds ◽  
Physico Chemical ◽  
Starch Gel ◽  
Ph Stat ◽  
Rapid Appearance

SummaryThe effects of trypsin and plasmin on the functional and physicochemical properties of purified human fibrinogen were observed at various stages of proteolysis. Concentrations of plasmin and trypsin that produced fibrinogenolysis at comparable rates as measured in a pH stat produced, at similar rates, loss of precipitability of fibrinogen by heat and ammonium sulphate and alterations in electrophoretic mobility on starch gel. Trypsin produced a more rapid loss of clottability of fibrinogen and a more rapid appearance of inhibitors of the thrombin-fibrinogen clotting system than did plasmin. Consistent differences were noted between the effects of trypsin and plasmin on the immunoelectrophoretic properties of fibrinogen during the early stages of proteolysis.These results are consistent with the hypothesis that trypsin initially reacts with the same peptide bonds of fibrinogen that are split by thrombin, but these same bonds do not appear to be split initially by plasmin. Measurement of the various functional and physico-chemical changes produced by the action of trypsin and plasmin on fibrinogen can be used to recognize various stages of proteolysis.

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