Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFree radical and free atom reactions in the sonolysis of aqueous iodide and formate solutionsEdwin J. Hart and Arnim HengleinCite this: J. Phys. Chem. 1985, 89, 20, 4342–4347Publication Date (Print):September 1, 1985Publication History Published online1 May 2002Published ini…
The least-squares refinement of non-centrosymmetric crystal structures as inversion twins is presented. It is shown that the absolute-structure (twin) parameter x may be used to define the chirality or polarity of untwinned crystals. The method has been applied to 20 compounds. The least-squares refinement of the abso…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen bonding in polymers: infrared temperature studies of an amorphous polyamideDaniel J. Skrovanek, Stephen E. Howe, Paul C. Painter, and Michael M. ColemanCite this: Macromolecules 1985, 18, 9, 1676–1683Publication Date (Print):September 1, 1985Publication History Publ…
ABSTRACT The variability of marine diatom Si:C and Si:N composition ratios was examined to assess their utility as ecological conversion factors. Twenty‐seven diatom species grown under an 18:6 h LD cycle and sampled at the end of the light period gave mean ratios, by atoms, of 0.13 ± 0.04 and 1.12 ± 0.33 for Si:C and…
High-resolution neutron diffraction studies have been carried out on KH2PO4 at 1K, 10K and 20K below Tc (123K), and on 95% deuterated K(DxH1-x)2PO4 at 2K, 6K and 10K below Tc (224K). The results show that in both cases the structural ordering is homogeneous: the temperature dependence of the proton (deuteron) ordering…
X-ray induced luminescence, photoluminescence and thermoluminescence of nominally pure Bi 4 Ge 3 O 12 crystals are studied within the 12K-295K temperature range. The broad emission band reported by other workers for radio- and photoluminescence is observed to present some structure. thermoluminescence spectra exhibit…
The effect of electron-electron interactions on the thermoelectric power for hopping transport in two and three dimensions is calculated in the low-temperature limit. While the conductivity requires a very precise measurement to extract a temperature exponent with enough precision to determine the role of the interact…
I report on the first complete experimental characterization of elastic and inelastic two-electron scattering processes in a ferromagnet. By explicit measurement of the spin polarization of primary and scattered electrons the contributions of all four partial scattering rates are determined. The Stoner continuum in Fe…
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…