Materials Literature
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Abstract The matrix of the Pliocene volcaniclastics from the Akrotiri area of the Santorini island (Greece) is dominated by clinoptilolite. Smectite, occasionally illite-smectite, opal-CT, cristobalite and mordenite are also present. The clinoptilolite-rich samples were heated at 460 and 560°C for 12 h and the reducti…
We report the structural characteristics of a high-quality stable decagonal quasicrystal (D phase) with 1.6nm periodicity, formed in Al75Ni15Ru10 alloy annealed at 890°C for 24h. The tiling structure and the arrangement of transition-metal atoms (Ru and Ni) in this Al-Ni-Ru D phase have been clearly revealed by high-r…
Finite-size effects in Bi lines of cross section 3 μm×w, where w=8–120 μm, have been studied. The lines were made by optical lithography followed by electrodeposition. At T=5 K, the magnetoresistance (MR) decreases monotonically with decreasing line width of the Bi films, from 44 000% at w=120 μm to 4000% at w=8 μm in…
Tetracarboxylic dianhydrides bearing a polyalicyclic structure, bicyclo[2.2.1]-heptane-2,3,5,6-tetracarboxylic 2,3:5,6-dianhydrides (BHDA), bicyclo[2.2.2]-octane-2,3,5,6-tetracarboxylic 2,3:5,6-dianhydrides (BODA), (4arH,8acH)decahydro-1t,4t:5c,8c-dimethanonaphthalene-2,3,6,7-tetracarboxylic 2,3:6,7-dianhydrides (DNDA…
Two impact modifiers, based respectively on polybutadiene (PB) and poly(butyl acrylate-co-styrene) (PBA), are compared in blends with four glassy polymers: polycarbonate (PC), poly(methyl methacrylate) (PMMA), poly(styrene-co-acrylonitrile) (PSAN), and poly(vinyl chloride) (PVC). Dynamic mechanical tests show glass tr…
dc magnetization measurements, for zero-field cooled (MZFC) and field-cooled (MFC) cases, have been carried out for flash-evaporated Pd-doped NiMn thin films. These included reentrant phases (Ni76−xPdx)Mn24, for 0⩽x⩽5, and Ni75Mn23Pd2, a pure spinglass phase. The studies were performed over the temperature range 3–300…
The crystal structure of schwartzembergite from the San Rafael mine, Sierra Gorda, Chile, tetragonal, a 3.977(1), c 12.566(4) A, I 4/ mmm , has been refined to an R index of 1.8% based on 103 unique observed ( I > 5σ I ) reflections. Schwartzembergite is optically biaxial, but long-exposure precession photographs show…
The synthesis of Bisphenol A polycarbonate (PC) via melt transesterification of diphenyl carbonate and Bisphenol A in the presence of different catalysts was studied in a batch reactor. Low catalytic activity of dibutyltin oxide (Bu2SnO) did not allow high molecular weight PC to be obtained for an appropriate reaction…
It is well‐known that clean room textiles are acting as a barrier protecting humans against the surrounding atmosphere or vice versa. These textiles are produced in the limited range of porosity and the air permeability. The porosity calculated from fabric geometry and the air permeability of two typical clean room te…
The synthesis and transition temperatures of a series of 5-(4-alkyl- and 4-alkoxy-phenyl)2-cyanobenzo[b]furans and a 5-(4'-alkylbiphenyl-4-yl)-2-cyanobenzo[b]furan are presented. The 2-cyanobenzo[b]furans show similar mesophase types to the analogous biphenyl and terphenyl compounds, which are obtained by replacing th…
This paper treats the axisymmetric flo w driven by Marangoni convection and a Rotating Magnetic Field (RMF) in a Floating-Zone configuration. For a low Prandtl number liquid, and different Marangoni values, we investigate the evolution of the flo w as the intensity of the RMF is increased. It evolves from a Marangoni…
Research in materials today has progressed from materials exhibiting structural functionality to those exhibiting electronic functionality. The study of solid-state ionics ushers in a new era of chemically functional materials. This chemical functionality arises out of the defect equilibria of these materials, and res…
The crystal structures of fedorite from the type locality, the Turiy complex (Kola Peninsula, Russia) and the Little Murun complex (Sakha, Russia), have been refined from single crystals by CCD X-ray diffractometry. Both samples are triclinic, space group P¯1; fedorite from Turiy has a 9.6300(7), b 9.6392(7), c 12.611…
A variant of the maximum entropy method (MEM), recently developed by Vartiainen et al., is proposed for infrared reflectivity spectra analysis. The procedure uses a new interpolation algorithm to estimate the so-called error phase that is the key step of the model. As shown by several examples, this approach is a good…
Durch Umsetzungen von elementarem Praseodym mit Selen und Selendioxid (SeO2) als Sauerstoffquelle in geeigneten stöchiometrischen Verhältnissen lassen sich die Praseodym(III)-Oxidselenide Pr10OSe14, Pr2OSe2, Pr2O2Se und Pr4O4Se3 innerhalb von jeweils sieben Tagen bei 750 °C in evakuierten Quarzglasampullen reinphasig…
Summary To date, much emphasis on scale-inhibitor evaluation and the study of scale kinetics has been carried out using static beaker tests. This paper describes the use of an electrochemically based technique that allows the extent of scaling on a solid surface to be determined in the presence and in the absence of s…
A ferrocene-containing side-chain liquid-crystalline polymethacrylate was oxidized with iodine into the corresponding ferrocenium polymeric species. The reduced polymer showed enantiotropic smectic C and smectic A phases. The oxidized polymer exhibited an enantiotropic nematic phase. The results described in this repo…
The commercial grade of isotactic polypropylene (iPP) homopolymer (Mosten 58.412) was doped with different amount of β-nucleant (NJ Star NU-100). The fracture behavior of the β-iPP was examined on injection- and compression moulded specimens under dynamic load. The fracture toughness KId and JId, respectively, were us…
A series of nickel complexes of the didentate ligand 1,3-bis[di(o-methoxyphenyl)phosphanyl]propane (o-MeO-dppp) has been synthesized and characterized. The first low-spin nickel complex containing two coordinated water molecules, [Ni(o-MeO-dppp)(H2O)2](PF6)2 (1), and compounds of the general formula [Ni(o-MeO-dppp)X2]…
Different types of electron (hole) ground energy level renormalization due to confined (L) and interface (I) phonons in a spherical quantum dot embedded in a semiconductor medium are investigated on the example of β-HgS/CdS nanoheterosystem. It is shown that for all QD sizes the shift of the ground energy level (Δ) is…