Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Ordering in metal alloys

Figure 26.4 Ordering in metal alloys. Two different atom types are interspersed (a) ordered at low temperature, and (b) disordered at high temperature. Source ... Figure 26.4 Ordering in metal alloys. Two different atom types are interspersed (a) ordered at low temperature, and (b) disordered at high temperature. Source ...
Using the so-called "block copolymers (a block of Na A-monomers at one end is covalently bonded to a block of Nb B-monomers) one can also realize the analogy of order-disorder phenomena in metallic alloys with polymers one observes transitions from the disordered melt to mesophases with various types of long range order (lamellar, hexagonal, cubic, etc ). We shall not consider these phenomena here further, however... [Pg.198]

Theoretical and experimental studies of surface segregation equilibrium phenomena in metallic alloys have been focused traditionally on substitutional solid solutions with elemental constituents (and non-metal impurities) assumed to be randomly distributed among the crystal lattice bulk and surface sites. Only in recent years more attention have been paid to the role of compositional order in surface segregation [1]. [Pg.86]

H.L. Skriver, O.K. Andersen "Self-Consistent Calculations of Ground-State Properties for Ordered Transition Metal Alloys", in Transition Metals 1977, ed. by M.J.G. Lee, J.M. Perz, E. Fawcett, Institute of Physics Conf. Ser. No.39, 100 (1978)... [Pg.274]

Both at the anode and cathode, binary Pt-M alloys are proposed, either to enable operation on CO containing fuel or to increase the activity for the oxygen reduction reaction. The M-metal is usually a transition metal, that is, Co, Ni, Fe, Mn, Ir. These metals themselves are thermodynamically less stable than Pt. As regards the stability of the alloy, several factors play a role the degree of alloying, the particle size, and the degree of ordering in the alloy. [Pg.283]

In the last decade order N electronic structure calculations [1, 2] made possible the study of large supercells containiug from 100 to 1000 atoms. Namely Faulkner, Wang and Stocks [2,3] have shown that simple linear laws, the so called qV relations, link the local charge excesses and the local Madelung potentials in metallic alloys. These qV linear laws have been obtained from the numerical analysis of data produced by Locally Self-consistent Multiple Scattering (LSMS) [1] calculations, while their formal derivation within the density functional theory has not yet been obtained. As a matter of fact, the above laws can be considered to hold at least within the approximations underlying I/SMS calculations, i.e. the l/ocal Density and the muffin-tin approximations. [Pg.367]

Some typical phenomena which have been described as second-order transitions are order-disorder transitions in metal alloys, onset of ferromagnetism, onset of ferroelectricity and onset of superconductivity. ... [Pg.315]


See other pages where Ordering in metal alloys is mentioned: [Pg.28]    [Pg.28]    [Pg.6]    [Pg.28]    [Pg.28]    [Pg.6]    [Pg.1156]    [Pg.117]    [Pg.24]    [Pg.153]    [Pg.722]    [Pg.113]    [Pg.28]    [Pg.6]    [Pg.171]    [Pg.82]    [Pg.218]    [Pg.3]    [Pg.27]    [Pg.66]    [Pg.61]    [Pg.19]    [Pg.78]    [Pg.1189]    [Pg.127]    [Pg.802]    [Pg.122]    [Pg.127]    [Pg.218]    [Pg.58]    [Pg.109]    [Pg.887]    [Pg.354]    [Pg.354]    [Pg.360]    [Pg.361]    [Pg.367]    [Pg.377]    [Pg.132]    [Pg.431]    [Pg.31]    [Pg.731]   
See also in sourсe #XX -- [ Pg.495 ]




SEARCH



Alloy metallic alloys

In alloys

Metallic alloys

Metals alloys

Ordered alloy

Ordering alloy

Short-Range Order in Metal Alloys

© 2024 chempedia.info