Materials Literature
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Quantitative bulk ferromagnetic behavior has been established for the molecular/organic solid [Fe(III)(C(5)Me(5))(2)].(+)[TCNE].(-). Above 16 K the dominant magnetic interactions are along a 1-D chain and, near T(c), 3-D bulk effects as evidenced by the value of the critical exponents dominate the susceptibility. The…
New optoelectronic materials based on polymer dispersed liquid crystals (PDLC) show great potential for application in displays, temperature sensors, optical computing and for solar energy control. We report liquid crystal, termoset or thermoplastic materials. PDLC materials may be formed by several different processe…
Electrochemical impedance spectroscopy (EIS) has been used to characterize the surfaces of anodized Al alloys during exposure to 0.5 N NaCl . The EIS‐data show pronounced effects of anodizing procedure (sulfuric acid, chromic acid), sealing procedure (unsealed, hot water, dichromate), and alloy chemistry (Al 2024, Al…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIndium in organic synthesis: indium-mediated allylation of carbonyl compoundsShuki Araki, Hirokazu Ito, and Yasuo ButsuganCite this: J. Org. Chem. 1988, 53, 8, 1831–1833Publication Date (Print):April 1, 1988Publication History Published online1 May 2002Published inissue 1 Ap…
Using a first-principles total-energy pseudopotential method, we investigate the transition mechanism for a pressure-induced martensitic transformation hcp\ensuremath{\rightarrow}bcc which occurs in Mg at pressures around 50 GPa. Two internal structural degrees of freedom are selected and one lattice is transformed in…
In the 1960s the Fourier and variance methods superseded the use of the FWHM and integral breadth in detailed studies of microcrystalline properties. Provided that due allowance is made in the analysis for systematic errors, particularly the effects of truncation of diffraction line profiles at a finite range, these r…
Abstract Crystal growth theory was applied to describe edge sites of phyllosilicates. Three face configurations were found to exist. One face has one tetrahedral site per tetrahedral sheet and two octahedral one-coordinated sites per crystallographic area ac sin β , where a and c are layer dimensions and β is the angl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen bonding in polymer blends. 4. Blends involving polymers containing methacrylic acid and vinylpyridine groupsJoon Y. Lee, Paul C. Painter, and Michael M. ColemanCite this: Macromolecules 1988, 21, 4, 954–960Publication Date (Print):April 1, 1988Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuaternary ammonium tetrakis(diperoxotungsto)phosphates(3-) as a new class of catalysts for efficient alkene epoxidation with hydrogen peroxideCarlo Venturello and Rino D'AloisioCite this: J. Org. Chem. 1988, 53, 7, 1553–1557Publication Date (Print):April 1, 1988Publication…
We report a size effect on the ferroelectric phase transition in ${\mathrm{PbTiO}}_{3}$ ultrafine particles. The samples were synthesized by an alkoxide method. The size was determined by x-ray analysis with the aid of Scherrer's equation. When the particle size is less than 50 nm, the transition temperature ${T}_{c}$…
Quantitative phase analysis of multicomponent mixtures using X-ray powder diffraction data has been approached with a modified version of the Rietveld computer program of Wiles & Young [J. Appl. Cryst. (1981), 14, 149–151]. This new method does not require measurement of calibration data nor the use of an internal sta…
The field of thermoelectric energy conversion is reviewed from both a theoretical and an experimental standpoint. The basic theory is introduced and the thermodynamic and solid state views are compared. An overview of the development of thermoelectric materials is presented with particular emphasis being placed on the…
A systematic account is given of the methods of preparation of oxide sulphides having the composition Ln2O2S (where Ln = lanthanide, Sc, or Y) in the form of polycrystalline materials, single crystals, thin films, and ceramics. The crystal-chemical, thermal, thermodynamic properties of the oxide sulphides are consider…
Progress in the Understanding of Ceramic Microstructures and Interfaces since 1976.- Ceramic Microstructures: The Art of the Possible.- Designing Material Structures.- Purposive Design of Nanocomposites: Entire Class of New Materials.- Design of High Thermal Expansion Glass-Ceramics Through Micros truetura1 Control.-…
The fundamental concepts of the homotopy theory of defects in liquid crystals and the results of experimental studies in this field are presented. The concepts of degeneracy space, homotopy groups, and topological charge, which are used for classifying the topologically stable inhomogeneous distributions in different…
A complex phase transition sequence was found in (C 3 H 7 NH 3 ) 2 CuCl 4 crystals. The specific heat C p , thermal expansion Delta d/d 0 and linear birefringence Delta b have been used to study this sequence. By comparison with the isomorphous manganese compound, two unusual features can be identified: a re-entrant p…
A general model for heat conduction in dielectric solids (at low temperatures) is elaborated that meets the restrictions placed on it by thermodynamics. The model is also shown to fit experimental data on second-sound speeds which, in turn, bear evidence of the need for a thermal inertia. Furthermore, the experimental…
The transient optical absorption and luminescence induced by irradiation of amorphous SiO 2 with an electron pulse have been measured. It is found that the transient optical absorption spectra do not depend on impurities and have a strong peak at 5.3 eV and a satellite peak at 4.2 eV. The peak energy of the luminescen…
We describe a novel technique for the fabrication of electro-optic (EO) waveguides in integrated optic device structures employing organic EO materials. The technique combines the poling and waveguide formation steps by utilizing patterned poling electrodes and the induced birefringence associated with the poling proc…
The temperature dependence of the inelastic neutron-scattering intensity from vitreous silica has been studied between 50 and 300 K down to frequencies of 150 GHz. Above 500 GHz one finds essentially harmonic behavior. Low-frequency anharmonic behavior can be described by a relaxational model using parameters determin…