Mixture alloy

Early work on superconductors concentrated on metals or metal mixtures (alloys). Niobium alloys are particularly good superconductors, and in 1973 a niobium alloy, Nb3Ge, was found to have Tc — 23 K, the highest known value for a metal superconductor. In 1986, a ceramic oxide with formula La2- Ba CuOq was found to show superconductivity at 30 K. Through intense research efforts on ceramic oxides, YBa2 C U3 Oj-, with Tc — 93 K, was discovered in 1987. 

Composition Dependence of Alloy Viscosity. Attempts have been made to calcnlate the viscosity of a dilnte liquid alloy from a theoretical standpoint, but with little success. This is primarily due to the fact that little is known about the interaction of dissimilar atoms in the liquid state. Empirical relationships for the viscosity of dilute liquid alloys have been developed, but these are generally limited to specific alloy systems—for example, mercury alloys with less than 1% impurities. The viscosities of binary liquid alloys have been empirically described using a quantity called the excess viscosity, (not to be confused with the excess chemical potential), which is defined as the difference between the viscosity of the binary mixture (alloy), pa, and the weighted contributions of each component, xipi and X2P2-... 

Members of this group are the naturally occurring, at ordinary temperatures solid or liquid elements and their homogenous mixtures (alloys). The group is subdivided into two groups ... 

J.-L. Bobet, B. Chevalier, B. Darriet, Effect of reactive mechanical grinding on chemical and hydrogen sorption properties of the Mg + 10wt.%Co mixture, . /. Alloys Compd. 330-332 (2002) 738-742. 

Synthesis of metallic nanoparticles proceeds in many ways they can be divided into physical and chemical. Physical methods include inert gas condensation, arc discharge, ion sputtering, and laser ablation. The main idea behind these methods is condensation of solid particles from the gas phase, the substrate for nanoparticle generation being pure metals (or their mixtures/alloys in the case of complex particle composition). Chemical methods, in turn, include various methods utilizing... 

Working definitions have been accepted for the following terms substance, mixture, alloy (see Chapter 1.2 for other definitions and abbreviations used in the GHS). 

Copper and palladium The proposed method utilise the reaction of studied ions with morpholinedithiocarbamate (MDTC). Derivative spectra of generated complexes allowed simultaneous determination of Cu and Pd in pharmaceutical samples, synthetic mixtures, alloys and biological samples. 38... 

The emfs of cells (2) were measured at a constant temperature for seven different compositions. The standard electrode was prepared by grinding powders of aluminum, antimony, and the CaAlF5-CaF2 salt mixture, followed by compacting. In all the esperiments, there was a 20 at.% excess of antimony with respect to the stoichiometric composition, AlSb. The compacted pellet was then annealed for 10 h at 800°C in an evacuated and sealed quartz ampoule. The electrode melt was prepared by compacting the previously obtained AlSb-GaSb alloy with the salt mixture. Alloys enriched with AlSb were handled in a dry cell. Samples of the... 

Chemical analysis of the alloys obtained by addition of the different ratios of the charcoal to the initial mixtures were given in Table II. As H3B03/Ni0 ratio of 1.11 fixed, boron contents in the final alloy was increased with increasing in ratio of fixed C to the total initial mixtures. Alloy weights were measured as 5.4 kg in first experiment and as 3.9 kg in second experiment, respeetively. Alloy weight was decreased with increasing in ratio of fixed C to the total initial mixtures. The casting temperatures were measured as 1182°C in the first experiment and as 1145°C in the second experiment, respectively. 

Long NV, Yang Y, Thi CM, Minh NV, Cao Y, Nogami M (2013) The development of mixture, alloy, and core-shell nanocatalysts with nanomaterial supports for energy conversion in low-temperature fuel cells. Nano Energy 2 636-676... 

The core material to be used depends on the actual processing requirements, particularly temperature. It can range from a wax to different ratios of zinc-aluminum eutectic mixtures (alloys) to special fusible eutectic alloys. The core material has to melt below the melt temperature of the plastic. These shaped cores are usually inserted in a mold cavity where it is retained by the mold (such as is used with a mold core puller) or by spiders (as used in certain metal core supports for extrusion dies). After processing, the core material... 

The corrosion resistance of a series of tantalum-tungsten alloys was also studied in 50% KOH at 30°C and 80°C, 20% HF at 20°C, and a mixture with 1 part KOH and 3 parts K3Fe(CN)6. In the hydroxide, a maximum in corrosion rate was obtained at about 60at% tantalum. A maximum in electrical resistivity was foimd at the same composition. In 20% HF, the tantalum-timgsten alloy system exhibits the relatively low corrosion rates associated with tungsten as long as the tungsten content is at least 20%, below which corrosion rates increase markedly. In the hydroxide-ferrocyanide mixture, alloys exhibit little improvement over tantalum. 

Certain metals, particularly mixtures (alloys) of titanium, iron, manganese, nickel, chromium, and others, can react with hydrogen to form a metal hydride in a very easily... 

The initial system. Registry I, which began operation in I 1964, established the viability and validity of the registration concept for fully defined organic substances. In 1968, the second version of the CAS Registry System, Registry II, was established. The scope of the system was increased to include inorganic substances, coordination compounds, polymers, mixtures, alloys, and incompletely defined substances. 

Crystallization of Blends The first polymer blend was made from two polymeric mbbers in 1846, but polymer blend technology and a scientific understanding of the underlying principles controlling the compatibility (or lack of) in polymer mixtures (alloys as they have been named recently) has taken place only in the latter part of the current century. Many blends are non-crystalline but our interest in this document is focused on the kinetics of phase transformations of binary and ternary systems that receives more attention annually. Some of these systems can be very complicated, often comprised of multiple phases that m involve homopolymers, copolymers, mesophases and the like. Polymorphism and even isomorphism may occur... 

---