Materials Literature
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The possibility of observing quantum size effects in very small metal particles by absorption spectroscopy is reexamined. According to the Gor'kov-Eliashberg theory, nonquadratic frequency dependence of the absorption coefficient persists at sufficiently low frequencies even when there is a size distribution.
Dielectric properties of ferroelectric {N(CH 3 ) 4 } 2 CoCl 4 were measured in detail, covering its all transition points. The triple D - E hysteresis loop in Phase III (4.6∼7.1°C, C 2 v 9 - P 2 1 c n ) was ascertained. The lattice distortion of this ferroelectric was determined along the three crystallographic axes b…
Charge-density waves (CDW) in one-dimensional conductors are studied by treating the electron-phonon interaction in the adiabatic limit, while weak-coupling electron-electron interactions are solved by renormalization-group methods. An exponent $\ensuremath{\delta}$ defines a renormalization of the effective electroni…
The electrical resistance of Li, Pd, Au, and Pb is measured as a function of temperature and pressure in the region -20 \ifmmode^\circ\else\textdegree\fi{}C to +30 \ifmmode^\circ\else\textdegree\fi{}C and 0--1.3 GPa. Self-consistent linear muffin-tin orbital band-structure calculations of these elements and of Al are…
The gaseous titanium oxides molecules Ti2O3 and Ti2O4 were observed for the first time by high temperature mass spectrometry in the vapors over a cobalt–titanium–oxygen system. From the study of three all-gas reaction equilibria, the stabilities of these molecules have been derived: D○0,at(Ti2O3) =2312±56 kJ mol−1 and…
Optical properties of ion-beam sputter deposited SiO2–TiO2 composite films were examined in terms of composition dependence of the optical parameters, optical energy gap, and absorption character of these films. The complex refractive index of SiO2 film in the nondispersive region (λ > 310 nm) was 1.48–i0.0000, and…
The nature of the phonon intensity pattern associated with low-temperature heat-pulse propagation is examined theoretically for a wide range of cubic crystals. In general, huge anisotropies in the thermal flux are predicted due to phonon focusing. The phonon-focusing patterns of cubic crystals divide naturally into tw…
The structure and crystal phase of carbon films prepared by an ion-beam sputter deposition were studied. The properties of the deposited carbon films were influenced by a hydrogen-ion bombardment during the film growth. It is noted that the hydrogen-ion bombardment activates the growth of diamond in the deposited carb…
We examine the role of multiple scattering in emission and/or diffraction spectroscopies that involve medium- and high-energy electrons. We use quantum-mechanical and classical methods to demonstrate the importance of multiple forward scattering in these techniques. Single-scattering theory produces errors because it…
We have measured the specific dislocation resistivity in copper single crystals with low densities of dislocations (\ensuremath{\sim}${10}^{7}$ cm of dislocations per ${\mathrm{cm}}^{3}$) introduced by bending. The dislocation density was estimated from etch-pit counts. Most of the specimens had residual resistivity r…
The gaseous molecule EuTiO3 has been investigated in a high temperature mass spectrometric study of vapors over the europium–titanium–oxygen system. From the enthalpy of reaction: EuTiO3(g)=EuO(g)+TiO2(g) and proper ancillary data, the atomization energy of this molecule has been determined. In addition, from the stud…
We present a series of measurements of the static and time-dependent interactions in the angular correlation of $^{111}\mathrm{In}$ (electron capture to $^{111}\mathrm{Cd}$) in pure and Sn-doped ${\mathrm{In}}_{2}$${\mathrm{O}}_{3}$. Results on the static electric field gradient are consistent with mainly ionic bonds…
Raman spectra of two superionic conducting crystals, fcc ${\mathrm{Li}}_{2}$${\mathrm{SO}}_{4}$ and bcc ${\mathrm{LiAgSO}}_{4}$, have been recorded in the frequency range 300--1400 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ across the entire temperature range of stability of each compound. Comparison of polarized and…
The Seebeck coefficient, electrical resistivity, thermal conductivity, and Hall effect have been studied in γ-phase La3−xS4 (LaSy) in the composition range 0.04≤x≤0.3 (1.35≤y≤1.48) in order to ascertain its suitability for high-temperature (300 to 1400 K) thermoelectric energy conversion. In this temperature and compo…
We have performed an angle-resolved photoemission investigation, using synchrotron radiation, of the surface electronic structure of Be(0001). At normal emission we observe a surface state in the ${\ensuremath{\Gamma}}_{3}^{+}$-${\ensuremath{\Gamma}}_{4}^{\mathrm{\ensuremath{-}}}$ band gap with a binding energy of 2.8…
Polarized reflection and luminescence have been measured for the single crystals of [MA 2 ][MX 2 A 2 ](ClO 4 ) 4 (M=Pt, Pd, X=Cl, Br, I and A=ethylenediamine, cyclohexanediamine). The strong absorption bands due to the charge-transfer (CT) exciton transitions between the mixed-valent metal ions have been investigated…
Values for the thermal conductivity and thermopower of graphite fibers grown by pyrolysis of natural gas are reported between 10 and 370 K. The measurements were made along the fiber axis on both as-grown fibers and fibers heat treated to 3000 \ifmmode^\circ\else\textdegree\fi{}C. It is shown that heat treatment impro…
Properties of rf-sputtered molybdenum oxide films for electrochromic display devices have been investigated. This report mainly concerns the dependence of the properties on the oxygen concentration in the sputtering atmosphere. The oxide films were prepared by rf sputtering from a compressed powder MoO3 target under a…
We have performed a systematic investigation of empty electronic surface states on the (100), (110), and (111) faces of nickel, copper, and silver using momentum-resolved inverse photoemission spectroscopy at \ensuremath{\Elzxh}\ensuremath{\omega}=9.7 eV. We present the measured two-dimensional energy-band dispersions…
Dielectric properties, lattice- and microstructure of ceramic BaTiO3 showing grain sizes of 0.3–100 μm were studied. At grain sizes <10 μm the width of ferroelectric 90° domains decreases proportionally to the square root of the grain diameter. The decreasing width of the domains can be theoretically explained…