Materials Literature
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We generalize the Landau-Zener theory of coherent tunneling transitions by taking thermal relaxation into account. The evaluation of a generalized master equation containing a dynamic tunneling rate that includes the interaction between the relevant system and its environment leads to an incoherent Zener transition pr…
We present neutron powder diffraction results which give unambiguous evidence for the formation of the recently identified new crystalline ice phase [[2]], labeled ice XII, in completely different conditions. Ice XII is produced here by compressing hexagonal ice ${\mathrm{I}}_{h}$ at $T\phantom{\rule{0ex}{0ex}}=\phant…
Abstract We employ rheological measurements of polyethylene blends in the melt and solid state, together with thermal analysis, to infer phase behavior. Partial‐miscibility in the melt is characterized by use of the double‐reptation model to define the complex modulus of the continuous phase for input into the emulsio…
We report on the preparation and field emission properties of quasi-aligned silicon carbon nitride (SiCN) nanorods. The SiCN nanorods are formed by using a two-stage growth method wherein the first stage involves formation of a buffer layer containing high density of nanocrystals by electron cyclotron resonance plasma…
We present an experimental study of the domain and twin structure in the martensitic phase of the ferromagnetic shape memory alloy Ni2MnGa using magnetic force microscopy. After cooling through the austenite–martensite transformation under no field, a rectangular specimen with {100} faces consistently adopted a struct…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTHyperbranched Polyesters as Nanoporosity Templating Agents for OrganosilicatesC. Nguyen, C. J. Hawker, R. D. Miller, E. Huang, J. L. Hedrick, R. Gauderon, and J. G. HilbornView Author Information IBM Almaden Research Center, 650 Harry Rd, San Jose, California 95120-6099 Departm…
The influence of the polarization interactions on the state and phase transitions in magnetic-ordered and dielectric crystals with two interacting order parameters has been investigated. Consideration is given to the case when the interaction in one of the subsystems is considerably weaker than that in the other subsy…
The interplay between material microstructure and magnetic hysteresis is studied in rapidly quenched Si–Fe alloys. Two ribbons of different average grain dimension 〈s〉 (35 and 160 μm) were prepared by annealing at different temperatures and studied through two independent approaches: Barkhausen noise measurements, and…
The effect of the periodic boundary condition (PBC) on the structure and energetics of nanotubes has been investigated by performing molecular-dynamics computer simulation. Calculations have been realized by using an empirical many-body potential energy function for carbon. A single-wall carbon nanotube has been consi…
Article Rheological and Calorimetric Characterization of an Epoxy System Cured in Presence of a Reactive Polyethersulphone was published on May 1, 2000 in the journal Journal of Polymer Engineering (volume 20, issue 3).
The Raman spectra of boron doped homoepitaxial diamond particles are investigated. The low frequency parts of the Raman scattering spectra of (100) and (111) growth sectors are very different in peak numbers and in peak positions. (100) facet has three broad bands centered at 580, 920 and 1020 cm -1 , (111) facet has…
Phosphor imaging plate technology has made it possible to directly image the distribution of primary beam electrons and scattered electrons in the environmental scanning electron microscope. The phosphor plate is exposed under electron scattering conditions in the microscope chamber. When processed, the electron inten…
Nanocrystalline exchange coupled Pr11.76Fe82.36B5.88 single-phase and Pr9Fe85B6 two-phase magnets containing 20 vol % α-Fe were produced using mechanical alloying. Micromagnetic finite element simulations were used to analyze the temperature dependence of the magnetic properties. In the single-phase exchange-coupled m…
Rapidly solidified Sm11Fe89 was observed to form partially ordered Sm2Fe17. The ordering increased systematically with annealing temperature, reaching an order parameter of 0.8 after annealing at 950 °C for 15 min. The coercivity of the corresponding interstitial compound Sm2Fe17Nx varied with annealing temperature an…
Abstract Nanomaterials have attracted a great deal of research interest recently. The small size of nanostructures constrains the applications of well-established testing and measurement techniques, thus new methods and approaches must be developed for quantitative measurement of the properties of individual nanostruc…
Abstract The degradation of a new thermoplastic polyethersulfone containing more than one SO 2 group in the repeating unit was carried out in both dynamic and isothermal heating conditions, under N 2 flow and in a static air atmosphere. The experiments indicated that the polymer degraded by initial random chain scissi…
It is demonstrated that the magnetostatic demagnetizing factor is not the only sample-shape dependent contribution to the hysteresis loop. There are also exchange contributions, which lead to interesting effects, particularly in nanostructures. An example is the recently discovered bulging mode in two-phase nanomagnet…
In order to determine the Debye parameter for the surface layer of Si crystal, we have measured the rocking curves of reflection high-energy electron diffraction (RHEED) from a Si(111)-7×7 surface at temperatures extending over a wide range, 293–1073 K. From the analysis of the dynamical calculation of RHEED intensity…
Article Carbon Black-Filled Conductive Polymers of Polypropylene, Ethylene Vinyl Acetate Copolymer, and Their Ternary Blends was published on May 1, 2000 in the journal Journal of Polymer Engineering (volume 20, issue 3).
Abstract Photoalignment technique has been applied for fabricating a zig‐zag defect‐free FLCD by using polyimide RN‐1199, −1286, −1266 (Nissan Chem. Ind.) and adopting oblique irradiation of unpolarized UV light. It is shown that among them RN‐1199 is the best for fabricating defect‐free cell, but RN‐1286 needs a low…