Materials Literature
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Hartree-Fock calculations on a linear cluster, Ni${\mathrm{N}}_{2}$, have been performed. Self-consistent-field calculations on the ground and hole states of the cluster and the free ${\mathrm{N}}_{2}$ molecule have been used to determine the shifts in valence ionization potentials (IP) of ${\mathrm{N}}_{2}$ when it i…
With the use of angle-resolved photoemission with synchrotron radiation, surface states on the (2\ifmmode\times\else\texttimes\fi{}1)/(2\ifmmode\times\else\texttimes\fi{}2) reconstructed diamond (111) surface are characterized. These states cover an energy range of about 2 eV and exhibit maximum emission intensity at…
Valence-level and core-level photoemission results are presented for ${\mathrm{N}}_{2}$ molecularly adsorbed on a Ni(100) surface at 77 K. Comparison is made to the Ni(100)/CO system. Differences are interpreted in terms of differences in chemisorption bonding. The data are in agreement with theoretical calculations (…
The presence of a moving dislocation represents a significant perturbation of a crystalline lattice. Here we present a quantum-mechanical account of the phonon field created by a moving edge dislocation. It is shown that the phonon energy is locally concentrated about the crystalline slip planes, indicating the existe…
We report the results of a detailed theoretical investigation of electronic properties of unrelaxed and relaxed ZnO surfaces. The surface electronic structure is evaluated using the scattering theoretical method on the basis of an accurately fit empirical tight-binding Hamiltonian for bulk ZnO. Surface band structures…
Raman scattering measurements between 20 and 450 K are reported in ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Al}}_{x}\mathrm{As}$ single crystals for the range $0\ensuremath{\le}x\ensuremath{\le}1$. Peak-frequency and linewidth variations versus temperature and composition of the first-order modes are studied in the l…
Ice IV, made metastably at pressures of about 4 to 5.5 kb, has a structure based on a rhombohedral unit cell of dimensions aR = 760±1 pm, α = 70.1±0.2°, space group R3̄c, as observed by x-ray diffraction at 1 atm, 110 K. The cell contains 12 water molecules of type 1, in general position, plus 4 of type 2, with O(2) i…
We have measured the near-normal incidence reflectivity of single-crystal rutile Ru${\mathrm{O}}_{2}$ and Ir${\mathrm{O}}_{2}$ for $\stackrel{\ensuremath{\rightarrow}}{\mathrm{E}}\ensuremath{\parallel}c$ axis and $\stackrel{\ensuremath{\rightarrow}}{\mathrm{E}}\ensuremath{\perp}c$ axis at room temperature in the photo…
A method of interpreting radial distribution functions (RDF) of amorphous metals is proposed in which the role of the local atomic structure is emphasized. It is found that the width and height of the peaks of the RDF are related to the second moment of the atomic-level hydrostatic stress distribution $〈{p}^{2}〉$. The…
We propose a fitting formula for the dielectric screening function of the degenerate electron liquids at metallic and lower densities which accurately reproduces the recent Monte Carlo results as well as those of the microscopic calculations and which satisfies the self-consistency conditions in the compressibility su…
The dielectric strength (i.e. breakdown voltage U c of a 2 mm gap) of pure SF 6 and its relaxation properties at p=100 kPa were measured for T=500-1800K. Two temperature regions with approximately constant values of U c T were found.
A model is presented describing how an organic solid transforms between a neutral and an ionic ground state. Whereas for a one-dimensional stack this transition is expected to be first order, the Coulomb interactions between stacks can cause the phase transition to occur over a broad temperature range by stabilizing a…
Surface optical phonons on the (100) face of strontium titanate have been observed by high-resolution EELS. Good agreement is found between experimental spectra and predictions based on a semi-classical theory, using the known dielectric function of strontium titanate.
The authors report resistivity measurements along the high-conductivity axis of (TMTSF) 2 ClO 4 , (TMTSF) 2 TaF 6 and (TMTSF) 2 SbF 6 for various hydrostatic pressures up to 12.5 kbar, and for transverse magnetic fields of up to 50 kG, in the temperature range 100 mK-4K. These measurements show that all three compound…
The physics, chemistry, and possible applications of the storage of hydrogen in intermetallic reservoirs are discussed. Storage in the form of intermetallic hydrides can be safe and, where hydrogen has some special value as a fuel, economical. New pumps and refrigerators based on the heat of sorption of the hydrogen i…
The Brillouin scattering spectra of NaNO2 have been observed as a function of temperature near the two phase transition points ; normal (paraelectric)-incomensurate (antiferroelectric) and incommensurate-comensurate (ferroelectric) phase transition points. A simple temperature dependence of the Brillouin frequency shi…
From the point of view of molecular interations, an attempt has been made to classify tetrahedral molecular crstals qualitatively by using experimental data of crystal structures, the Debye characteristic temperature at O K, θD(O), assuming 6N degrees of vibrational freedom, and the transition or melting tempreratures.
The distribution of 239Pu formed in uranium dioxide during irradiation is nonuniform and changes with burnup. This implicates a burnup effect on the fuel temperature distribution.The total 239Pu concentration during irradiation and its radial distribution at end-of-life has been calculated in low-enriched UO2 fuel pel…
In the Finslerian deformation theory of ferromagnetic substances, each point (x) is endowed with the unit vector ( y) called the spin and the line-element (x,y) is taken as the independent variable. The length of y is normalized at each point, so that the direction of y alone is noticed. This is the so-called spin dir…
The Type Ck 35 steel was electrochemically charged with hydrogen. For this purpose, the testing material was electrodeposited by cadmium. Acoustic emission analyses were correlated with the conditions of hydrogen charging and the analytically measured hydrogen content. A correlation between the signals of acoustic emi…