Materials Literature
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Abstract Polymer films were deposited from the plasma polymerization of the mixtures of hydrocarbons, ethane, ethylene, and acetylene, and tetrafluoromethane (CF 4 ) or hexafluoroacetone (HFA). The surface properties, the advancing contact angle of water, and surface energy of the films deposited and the chemical comp…
Hyperfine fields have been calculated by the LMTO-ASA method within the framework of the LSD approximation. The hyperfine field at the Co position in Co 2 TZ changes drastically with the T atom from a positive value for the case T=Ti to a negative value for the case T=Fe. The change occurs mainly in the contribution t…
The temperature-dependent resistivity of the two-dimensional quasicrystals ${\mathrm{Al}}_{65}$${\mathrm{Cu}}_{15}$${\mathrm{Co}}_{20}$ and ${\mathrm{Al}}_{70}$${\mathrm{Ni}}_{15}$${\mathrm{Co}}_{15}$ is studied along the periodic direction (${\mathrm{\ensuremath{\rho}}}_{\mathit{p}}$) and in the quasiperiodic plane (…
A minimum-energy path in strain space has been determined which takes cubic silicon into itself. Energies are computed using the Stillinger-Weber model potential and first-principles total-energy calculations. The energy along this path has an additional minimum corresponding to a crystal structure with a body-centere…
Fluorescence microscopy with polarized excitation allows regions of uniform tilt to be seen within domains of the liquid-condensed phase in monolayers of esters at the air/water interface. Transitions between a tilted and an utilted phase have been observed. Tilt regions within domains form regular six-arm patterns th…
Abstract Poly(vinylidene fluoride) films were γ‐irradiated in the dose range of 1–20 Mrad, resulting in up to 74% gel. The irradiated polymer undergoes both crosslinking and chain scission, about 5 : 3 events, respectively. Swelling measurements indicate an increasing crosslink density with the gel content, already at…
We discovered that an organic radical crystal, p-nitrophenyl nitronyl nitroxide (p-NPNN), is a quasi-1D ferromagnet induced by unpaired electrons on radicals. The magnetization and the susceptibility of the triclinic \ensuremath{\gamma}-phase crystal are very well represented by the Bethe-ansatz solution of the S=1/2…
A model is proposed for the ``first sharp diffraction peak'' (FSDP) in glasses. The FSDP is a chemical-order prepeak due to interstitial volume around cation-centered structural units. Calculated FSDP positions of some covalent glasses agree well with experiment, and the anomalous temperature and pressure dependences…
Thin tetrahedrally coordinated amorphous carbon (ta-C) films have been grown using a filtered vacuum arc. ta-C is a new allotrope of carbon whose existence was previously thought to be unlikely. A model is proposed which accounts for the formation and structure of these films on the basis of the compressive stress gen…
Through numerical simulation and consideration of phonon scattering by two-level states, the heat conductivity kappa(T), where T is temperature, has been calculated on model structures. The values obtained are in good quantitative agreement with measured data on polymethylmethacrylate, epoxy, amorphous selenium, and a…
Abstract Mössbauer spectra of alkyl- and arylamine coordinated pentacyanoferrate(II) complexes, Na3[Fe(CN)5L]·xH2O where L=(CH3)3N, (CH3)2CHNH2, (CH3)2CHCH2NH2, (CH3)3C–NH2, C6H5NH2, C6H5NHCH3, C6H5N(CH3)2, C6H5NHC2H5, o-ClC6H4NH2, and p-ClC6H4NH2 have been studied. All compounds exhibit a well-resolved quadrupole dou…
The clay mineralogy of 12 soils (Dystrochrepts, a Eutrochrept, a Cryochrept and a Placaquept) formed in tuffaceous greywacke parent rocks is presented and discussed. In a New Zealand context, the soils are unusual because of their base-rich parent material which has been partly pre-weathered to smectite and kaolin min…
Amorphous (Tb 1- x Gd x ) 30 Fe 70 thin films were prepared at various substrate temperatures ( T sub ) and with various thicknesses, and their magnetic properties were investigated. The films prepared at T sub =77 K show only in-plane anisotropy, and those prepared at T sub =473 K only perpendicular anisotropy. The f…
Transfer (i.e., desorption or detachment) of 220Rn progeny from a substrate (metal disc, filter material, and activated charcoal) to its surroundings has been investigated. The technique, methodology, and materials used differ from the work of others in a number of significant ways. For instance, 220Rn progeny were de…
Abstract Tiling the plane is a very old activity of mankind. Grunbaum and Shep herd (1986) give many beautiful examples of decorative tilings belonging to nearly all ancient civilizations. Most decorative tilings are those we call periodic, which means that they are invariant by two independent trans lations.
The thermal and environmental stabilities of boron nitride (BN), aluminium nitride (AIN), and silicon nitride (Si3N4) ceramics have been evaluated using thermochemical modelling. The volatility diagrams of these materials have been established at 2000 K. Master volatility diagrams with equilibrium pressure of dominant…
This paper presents an application of the Luikov system of heat and mass transfer equations in dimensionless form to predict the temperature and moisture distributions in a slab of capillary-porous material during drying. The heat and mass potentials of the external medium in the boundary conditions are assumed to var…
Abstract The rheological behaviour of liquid crystalline polymers differs considerably from that of ordinary polymers as well as of low‐molecular‐weight liquid crystals. The only theoretical approach which has reached a significant development is based on the rigid rodlike model of the polymer molecule. In spite of th…
The reaction rates between iron-chromium alloys (1.17, 5.65 and 11.96 a/0Cr) and tellurium were measured in the temperature range of 873–1,023 K at 350 Pa of tellurium vapor pressure, and in the tellurium vapor pressure range of 66.7–600 Pa at 923 K. The electron probe microanalysis, marker experiment and X-ray diffra…
Electrical conduction in amorphous Nb2O5 oxide films, obtained by electrochemical methods, has been measured in the temperature range 293 to 420 K. Different conduction processes are considered, depending on the applied electric field. At low fields, the results are consistent with a Small Polaron Hopping process in t…