Materials Literature
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By means of the ion-channeling technique, we have shown the existence of a very low-energy (\ensuremath{\sim}3 meV) excitation for deuterium impurities trapped to vacancies in nickel. The excitation is associated with a change of the D location from near octahedral to near tetrahedral. On the basis of calculations of…
Tip-stable, tip-oscillating, and tip-splitting types of dendrites were observed experimentally in a two-dimensional supersaturated N${\mathrm{H}}_{4}$Cl solution. The relation between the tip velocity $V$ and the tip curvature $K$ were measured for the tip-stable type. It was found that $V$ is proportional to $K$ inst…
The structure of the eutectic system Ge15Te85 in the liquid state is studied in the temperature range from the melting point (648 K) up to 873 K. Partial structure factors and pair correlation functions (gij(r)) for the TeTe and the GeTe pairs are determined for the first time by the combination of data from neutron…
The magnetostriction of polycrystalline mixed nickel-zinc and cobalt-zinc ferrites of different compositions are studied as a function of composition, magnetic field, and temperature, using the strain gauge method. At room temperature it is observed that the values of saturation magnetostriction in both the ferrite sy…
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…