Materials Literature
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The recently discovered high-intensity thermoluminescence (TL) emission in Al 2 O 3 doped with Cr and Ni is analysed more deeply by measuring the effects of x-ray irradiation on the optical absorption in parallel with the TL process, together with the effect of optical bleaching. It is proposed that the high-intensity…
The effects of applied transverse field on magnetic properties (transition temperature, compensation temperature and magnetization) of a disordered ferrimagnetic binary alloy which can exhibit two compensation points are examined. It is proposed that the application of a weak transverse field to the sample may be a us…
We present a microscopic theory of the transition to and properties of the amorphous solid state of a system of vulcanized (i.e., randomly crosslinked) macromolecules. Our approach invokes a variational hypothesis for the random static density fluctuations characterizing this solid state. The variational parameter is…
We report on picosecond laser-induced damage experiments that were carried out on a natural type-IIa diamond and a thick specimen of high-quality chemically vapor-deposited (CVD) diamond. In conjunction with earlier measurements performed elsewhere on an ‘‘optically thick’’ single crystal, it is shown that for spot si…
The defect properties of rapidly thermally oxidized porous silicon are studied by electron paramagnetic resonance. Two different types of defects can be distinguished. One is very similar to the defects observed in damaged crystalline or amorphous Si, whereas the second one is closely related to the Pb center. A maxim…
Novel ferroelectric bismuth vanadate, Bi2VO5.5 (BVO), thin films have been grown between lattice matched metallic LaNiO3 (LNO) layers deposited on SrTiO3 (STO) by the pulsed laser deposition technique. LNO/BVO/LNO/STO and Au/BVO/LNO/STO trilayer structures exhibited c-oriented (001) growth of BVO. LNO has been found t…
A time-dependent small-angle light scattering (SALS) study is presented which demonstrates the feasibility of electric-field-induced phase transitions in nonionic binary liquids near the critical point. Mixing of two-phase solutions induced by electric fields is shown to be a universal feature shared by a wide class o…
Pulsed laser deposition (PLD) from a hot pressed manganese doped ZnS target using a KrF laser, has produced a high rate deposition method for growing luminescent thin films. Good stoichiometric quality and typical luminescent crystal structures have been observed with a predominant hexagonal phase and little evidence…
Secondary ion mass spectrometry was used to profile the diffusion of oxygen in polycrystalline β-cristobalite and vitreous SiO2. The tracer concentration profiles of cristobalite are consistent with a model based on two mechanisms: bulk and short-circuit diffusion. The profiles of partially crystallized samples contai…
The dynamics around the liquid-glass transition in ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$ have been investigated by photon correlation spectroscopy. A two-step relaxation is for the first time observed in a ``strong'' network forming glass. The behavior is similar to the fast \ensuremath{\beta} and slower \ensuremath{\a…
We have used light scattering to study the kinetics of polymerization-induced phase separation in a liquid-crystal--polymer mixture. The evolution of the structure factor is compared with scaling predictions for thermally quenched systems. We have also observed a cascading phenomenon where phase separated domains beco…
Giant and isotropic magnetoresistance as huge as −53% was observed in magnetic manganese oxide La0.72Ca0.25MnOz films with an intrinsic antiferromagnetic spin structure. We ascribe this magnetoresistance to spin-dependent electron scattering due to spin canting of the manganese oxide.
At room temperature a large magnetoresistance, \ensuremath{\Delta}R/R(H=0), of 60% has been observed in thin magnetic films of perovskitelike La-Ba-Mn-O. The films were grown epitaxially on ${\mathrm{SrTiO}}_{3}$ substrates by off-axis laser deposition. In the as-deposited state, the Curie temperature and the saturati…
The observation of inversion walls and nematic schlieren textures with singularity of high strength in polymer samples is reported. The polymers are of the type with two-dimensional mesogenic units and flexible spacers in the main chain and all form a nematic liquid crystal phase above melting.
Infrared technology has been used in industrial heating applications for many decades. As infrared heaters and the control of the heaters has improved wider use and acceptance of this technology has resulted. It is now a commonly used means of heating webs and three dimensional objects in hundreds of manufacturing pro…
Abstract The compatibilization and impact modification of blends of a relatively new engineering plastic polyamide 4.6 (PA 4.6) and a poly(aryl ether sulfone) (PSU) are investigated. PSU‐b‐PA6 block copolymers, which can be easily synthesized by ring opening polymerization of ϵ‐caprolactam in the presence of a commerc…
Wide angle x-ray diffraction studies of silk fibers from various races of silkworms were made to evaluate the crystal size and lattice disortion parameters, since these determine the properties of silk fibers. Also, minimum enthalpy for the formation of these fibers was estimated and compared for the various races. Cr…
The direct synthesis of a number complexes with general composition Cu 4 OCl 6 - n(CH 3 ) 2 NH · mSolv, where n = 4, m = 0-2 and Solv = CH 3 OH, DMSO, is reported. It is shown by X-ray structure investigation, that in Cu 4 OCl 6 .4 (CH 3 ) 2 NH the copper atoms are linked by μ 4 -oxygen and μ 2 -chlorine bridging atom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSorption and transport of sulfur dioxide in polysulfoneP. H. Pfromm and W. J. KorosCite this: Macromolecules 1993, 26, 22, 6141–6142Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published inissue 1 October 1993https://pubs.acs.org/doi/10.1…
The low temperature and isothermal dynamic mechanical proper ties for different plasticizers like aromatic oil, paraffinic oil, and di-octyl phthalate (DOP) in epoxidized natural rubber (ENR) vulcanizates were stud ied. 10, 20, and 40 phr of aromatic oil were used for studying the effect of plasti cizer concentration…