Materials Literature
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Article Zur kristallchemischen Einordnung von NaSbCl6, NaNbCl6« und NaTaCl6 was published on July 1, 1992 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 198, issue 1-4).
Abstract Polyarylates containing pendant silyl group were prepared by the phase‐transfer catalyzed, two‐phase polycondensations of 2,2‐bis (4‐hydroxyphenyl) propane with corresponding dicarbonyl chlorides such as 2‐trimethylsilylterephthaloyl chloride, 5‐trimethylsilylisophthaloyl chloride, 5‐dimethylphenylsilylisopht…
We report an observation of a smectic-A--smectic-C--smectic-F (A-C-F) meeting point in a binary liquid-crystalline system. Detailed high-precision x-ray measurements enabled us to characterize the meeting point as a triple point, a point at which the three phases coexist. A direct consequence of this result is the exi…
Peer Reviewed
II–VI materials are important for optoelectronic devices. These devices are currently wet etched and due to the isotropic nature of wet etching, their etch geometries are limited. Reactive ion etching (RIE), a dry etch process, is a more desirable alternative, because it offers a means of producing small anisotropic s…
Substrate-free a-SiO2 films, 480 Å in thickness, have been made by means of electron beam evaporation. Electron diffraction patterns, taken under the condition that the incident beam is normal to the films, are all centre-symmetric, while their intensity features vary considerably with the film thickness. Since a film…
Electrical resistance measurements have been performed on ZrS2, ZrSe2, and ZrSSe single crystals grown by Iodine vapour transport technique in the pressure range 10 kilobar to 80 kilobar (1 GPa-8GPa). It is observed that all these crystals show a decrease in resistance with increase in pressure. The results have been…
Yttrium aluminum garnet (YAG - Y3Al5O12) fibers have been prepared by dry spinning solutions of yttrium and aluminum carboxylate polymers (precursor route) and by dry spinning aqueous oxide sols (sol-gel route). Fibers from aqueous diphasic gels are prepared by mixing a colloidal alumina sol containing 50-nm hydrous a…
Abstract The structure and phase transitions in poly[bis‐(2,2,3,3‐tetrafluoropropoxy)phosphazene] have been studied by differential scanning calorimetry (DSC) and x‐ray diffraction. Two crystalline phases and one mesomorphic phase are found, denoted I, II, and III, respectively. These phases convert reversibly one int…
Two processes are proposed for preparing anhydrous magnesium chloride by use of alcohols. Some alcohols can replace water to form coordinates with MgCl2, and make the dehydration of magnesium chloride much easler. The possibility of dehydration by alcohol distillation is discussed, and n-butanol was found to be the pr…
Labeling textile blends requires identification and quantification of their fibrous components. Blends of specialty animal fibers with sheep's wool are of special, practical importance; for these the light microscope is the traditional tool of analysis. To investigate the actual applicability of light microscopy for a…
Since its first commercial use in the early fifties naph thalene-1,5-diisocyanate (NDI) has been used almost exclusively in combina tion with polyadipate diols. The corresponding prepolymers crosslinked with 1,4-butanediol give solid NDI elastomers; crosslinking with water results in microcellular elastomers. NDI/este…
Large (NH4)H(SeO4)2 crystals and (NH4)4H22(SeO4)3 crystals grow usually from non-stoichiometric solutins with an excess of selenate acid. Complex dielectric anomalies at crystal phase transitions and suggest some kind of impurity in the crystal lattice. X-band ESR measurements of γ-irradiated single crystals identifie…
Space-time diagrams are used to analyze the dynamics of the liquid-crystal smectic C director in two-dimensional shear. We find a steady-state ring pattern only persists if there are no broken rings. A pair of defects, disclinations, is created when a ring breaks. With broken rings, the pattern dynamics is a sensitive…
Abstract Polymer gel films [poly(1‐vinyl‐2‐pyrrolidinone‐co‐ N,N ′‐methylenebisacrylamide) (PVPD)] which contain simple organic electrochromics [ p ‐diacetylbenzene ( p ‐DAB), dimethyl‐ or diethyl terephthalate ( p ‐DMP or p ‐DEP)] are prepared and their optical responses to applied voltage are investigated. p ‐DAP/PV…
Room-temperature M\"ossbauer spectra have been measured for icosahedral (i-phase) ${\mathrm{Al}}_{65}$${\mathrm{Cu}}_{20}$${\mathrm{Fe}}_{15}$ and iron-doped decagonal (T-phase) ${\mathrm{Al}}_{65}$${\mathrm{Cu}}_{15}$${\mathrm{Co}}_{20}$ quasicrystals. The observed T-phase spectrum is qualitatively different from any…
Wiring failures linked to insulation damage have drawn much attention in the aerospace industry and concerns have developed regarding the stability and safety of polyimide insulated electrical wire. Several polyimides were selected for evaluation for resistance to degradation by various aqueous alkaline solutions. The…
Ozone resistance of highly saturated nitrile rubber (HNBR) has been studied; the effect of hydrogenation progress of HNBR was evaluated at various ozone test conditions such as static, dynamic, and sequential condi tions. Dependence of its hydrogenation progress on ozone resistance is discussed by using parameters of…
The instability of antiphase boundaries (APB's) on {111} is one possible explanation for the abnormal negative temperature dependence of yield strength (TOYS) in Fe3Ge but APB tubes are found in deformed Fe3Ge which suggests that APB{111}'s are not unstable. Actual measurement of the APB energy on {111} again indicate…
Three new ternary compounds MnCuP, MnCuP 0.5 As 0.5 and MnCuAs have been prepared and characterized by X-Ray, DTA and magnetic measurements. They crystallize orthorhombically in the space group P nma (No. 62). The structures were calculated from single crystal data. The melting points were determined by DTA measuremen…