239 research outputs found
Impurity effects on the grain boundary cohesion in copper
Segregated impurities at grain boundaries can dramatically change the
mechanical behavior of metals, while the mechanism is still obscure in some
cases. Here, we suggest an unified approach to investigate segregation and its
effects on the mechanical properties of polycrystalline alloys using the
example of 3 impurities (Mg, Al, Si, P, or S) at a special type tilt grain boundary in Cu. We show that for these impurities
segregating to the grain boundary the strain contribution to the work of grain
boundary decohesion is small and that the chemical contribution correlates with
the electronegativity difference between Cu and the impurity. The strain
contribution to the work of dislocation emission is calculated to be negative,
while the chemical contribution to be always positive. Both the strain and
chemical contributions to the work of dislocation emission generally become
weaker with the increasing electronegativity from Mg to S. By combining these
contributions together we find, in agreement with experimental observations,
that a strong segregation of S can reduce the work of grain boundary separation
below the work of dislocation emission, thus embrittling Cu, while such an
embrittlement cannot be produced by a P segregation because it lowers the
energy barrier for dislocation emission relatively more than for work
separation
Physical and chemical properties of Cu(I) compounds with O and/or H
The electronic structure and chemical bonding of Cu(I) compounds with O and/or H are investigated using ab initio calculations based on density functional theory. A hybrid functional PBE0 is employed, which accurately reproduces an experimental band gap of cuprite Cu2O. Cuprous hydroxide CuOH (cuprice) is found to be an indirect band gap semiconductor. Depending on the bond network configuration of CuOH, its band gap is found to vary between 2.73 eV and 3.03 eV. The presence of hydrogen in CuOH has little effect on the character of Cu–O bonds, as compared to Cu2O, but lowers the energy levels of the occupied states upon O–H bond formation. The bonding charge density and electron localization function calculations reveal that a closed-shell Cu–Cu interaction takes place in Cu2O and CuOH between the neighbouring Cu cations belonging to different bond networks. Besides, three structures of cuprous hydride CuH are investigated. We find that the halite structure of CuH can be stabilized at high pressure (above 32 GPa) while wurtzite is the most stable structure of CuH at ambient pressure. The H–H interaction contributes to the dynamical stabilization of the halite structure. The wurtzite and sphalerite structures of CuH are predicted to be semiconducting with small band gaps, while the halite structure is calculated to be metallic
Structure and chemistry of liquid Al-Cu alloys : molecular dynamics study versus thermodynamics-based modelling
Solid solution decomposition and Guinier-Preston zone formation in Al-Cu alloys: A kinetic theory with anisotropic interactions
Using methods of statistical kinetic theory parametrized with
first-principles interatomic interactions that include chemical and strain
contributions, we investigated the kinetics of decomposition and microstructure
formation in Al-Cu alloys as a function of temperature and alloy concentration.
We show that the decomposition of the solid solution forming platelets of
copper, known as Guinier-Preston (GP) zones, includes several stages and that
the transition from GP1 to GP2 zones is determined mainly by kinetic factors.
With increasing temperature, the model predicts a gradual transition from
platelet-like precipitates to equiaxial ones and at intermediate temperatures
both precipitate morphologies may coexist.Comment: 9 pages, 8 figure
Structural stability of intermetallic phases in the Zr–Sn system
A thermodynamic description of the intermetallic compounds in the Zr–Sn binary system has been obtained using total energy calculations by means of the Vienna ab initio simulation package. Our calculations show that hexagonal compounds Zr5Sn4 and Zr5Sn3 are the most stable phases in the Zr–Sn binary system. Their high stability is found to be due to hybridization of the Sn 5p with Zr 4d electronic states. Based on the calculated energies, the conclusion is made that Zr substitution on the Sn sites takes place in the Zr Sn phase, which accounts for the unusual stoichiometry of this Cr3Si structure type compound
Dynamical mean-field theory of photoemission spectra of actinide compounds
A model of photoemission spectra of actinide compounds is presented. The
complete multiplet spectrum of a single ion is calculated by exact
diagonalization of the two-body Hamiltonian of the f^n shell. A coupling to
auxiliary fermion states models the interaction with a conduction sea. The
ensuing self-energy function is combined with a band Hamiltonian of the
compound, calculated in the local-density approximation, to produce a solid
state Green's function. The theory is applied to PuSe and elemental Am. For
PuSe a sharp resonance at the Fermi level arises from mixed valent behavior,
while several features at larger binding energies can be identified with
quantum numbers of the atomic system. For Am the ground state is dominated by
the |f^6;J=0> singlet but the strong coupling to the conduction electrons mixes
in a significant amount of f^7 character.Comment: Solid State Communications, in press; 4 pages 4 figure
Screened Coulomb interactions in metallic alloys: II Screening beyond the single-site and atomic sphere approximations
A quantitative description of the configurational part of the total energy of
metallic alloys with substantial atomic size difference cannot be achieved in
the atomic sphere approximation: It needs to be corrected at least for the
multipole moment interactions in the Madelung part of the one-electron
potential and energy. In the case of a random alloy such interactions can be
accounted for only by lifting the atomic sphere and single-site approximations,
in order to include the polarization due to local environment effects.
Nevertheless a simple parameterization of the screened Coulomb interactions for
the ordinary single-site methods, including the generalized perturbation
method, is still possible. We obtained such a parameterization for bulk and
surface NiPt alloys, which allows one to obtain quantitatively accurate
effective interactions in this system.Comment: 24 pages, 2 figure
A new 2D monolayer BiXene, M2C (M = Mo, Tc, Os)
The existence of BiXenes, a new family of 2D monolayers, is hereby predicted. Theoretically, BiXenes have 1H symmetry (P6[combining macron]m2) and can be formed from the 4d/5d binary carbides. As the name suggests, they are close relatives of MXenes, which instead have 1T symmetry (P3[combining macron]m1). The newly found BiXenes, as well as some new MXenes, are shown to have formation energies close to that of germanene, which suggests that these materials should be possible to be synthesised. Among them, we illustrate that 1H-Tc2C and 1T-Mo2C are dynamically stable at 0 K, while 1H-Mo2C, 1T-Tc2C, 1H-Os2C, and 1T-Rh2C are likely to be stabilised via strain or temperature. In addition, the nature of the chemical bonding is analysed, emphasizing that the covalency between the transition metal ions and carbon is much stronger in BiXenes than in MXenes. The emergence of BiXenes can not only open up a new era of conducting 2D monolayers, but also provide good candidates for carrier materials aimed at energy storage and spintronic devices that have already been unveiled in MXenes
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