Materials Literature
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Abstract The IR spectra of AgNO 3 were recorded using single‐crystal samples and polarized radiation. More detailed information was obtained than that reported in previous studies using polycrystalline samples. The very strong IR absorption bands of the ν 3 and ν 2 modes were studied by polarized reflection measuremen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDouble isomerization polymerization of 2-amino-2-oxazolines: a novel ring-opening polymerization accompanying isomerization of growing speciesMasatoshi Miyamoto, Keigo Aoi, Seiji Yamaga, and Takeo SaegusaCite this: Macromolecules 1992, 25, 19, 5111–5114Publication Date (Prin…
It has been found that the arc-melted NdFe/sub 10.7-x/Co/sub x/Ti/sub 1.3/ (x=0/2/4/6) alloys have nearly single phase of ThMn/sub 12/-type structure except the small amount of (Fe, Co)2Ti (or Fe/sub 2/Ti) and alpha -Fe phases. The ThMn/sub 12/-type phase forms as square prisms and (Fe, Co)/sub 2/Ti (or Fe/sub 2/Ti) e…
The charged state of bismuth atoms in n-type bismuth-modified amorphous thin films of Ge20Se80 and As2Se3 has been studied by x-ray photoelectron spectroscopy. On the basis of the observed chemical shift, it is concluded that the Bi atoms in the modified films are positively charged. The charged Bi atoms perturb the e…
The Stoner-Wohlfarth hysteresis model with stochastic input is used to describe viscosity or creep in magnetic materials. An expression for the expected value of the magnetic moment of Stoner-Wohlfarth particles as a function of time is derived. It is found that this expected value for each particle decays exponential…
Thermally stimulated currents (TSCs) were examined in a temperature range from room temperature to 170 °C for positively corona-charged polypropylene films which were, before charging, uniaxially cold drawn to different drawing ratios D up to 3.5 or were annealed at different annealing temperatures Ta after drawn to D…
When the DC magnetization curve (B-H) of nonoriented material is measured in a ring specimen, there is an intrinsic error due to the assumption that the mean magnetic path length is equal to the mean geometric path length. A novel method for determining the B-H curve accurately is proposed. The validity of the method…
A molecular graphics analysis of the features which prevent cytosolic malate dehydrogenase dimers from forming tetramers was evaluated by its success in predicting the synthesis of a version of the LDH framework which is a stable dimer. Surface residues responsible for malate dehydrogenases being dimers were revealed…
The molecular and crystal structure of the classic nematogen 4-methoxybenzylidene-4′-n-butylaniline (MBBA) was determined by X-ray diffraction method at −163°C (diffractometer Nicolet R3m/V, Mo-radiation, 2256 observable reflections, R=0·058). The monocrystal of MBBA was grown from the polycrystalline sample in a thin…
A novel method has been developed to measure the amount of precipitated Fe in a series of (Nd/sub 0.9/Dy/sub 0.1/)/sub x/Fe/sub 93.5-x-y/Nb/sub y/B/sub 6.5/ alloys, where x=13, 14, 15, or 17, and y=0 or 0.5. It has been found that the amount of precipitated Fe decreases significantly with increasing rare earth content…
Clorsulon was measured in plasma and urine of sheep and goats after administration of a single intravenous (i.v.) and after a single oral dose of 7 mg/kg. A three-compartment model with elimination occurring from the central compartment was determined to best describe the i.v. data, whereas a one-compartment model wit…
Single crystals of a-KZnPO 4 , the low-temperature modification of potassium zinc orthophosphate, were obtained from KZnPO 4 powder by high pressure experiments in a modified Belt-type apparatus. The crystals are hexagonal, space group P 6 3 , with a = 18.155(2), c = 8.504(1) Å, c/a = 0.4684 and Z = 24. The crystal st…
Gold plays a dominant role in the jewellery market. This is to a large extent due to the intrinsic value of gold, its beauty and its unique resistance to tarnish and corrosion. In 1990 the amount of gold used in jewellery was about 2000 t worldwide, reaching about 75% of the total demand for gold. The demands on gold…
Abstract The effectiveness of thermal analysis as a technique for screening polymeric candidates for high temperature composite application is described. DSC, DMA, and TGA were employed to measure glass transition temperature, characterize blend phase morphology, and assess thermo‐oxidative stability. The materials st…
New or redefined printed symbols are proposed in the light of the recently accepted redefinition of symmetry elements [de Wolff et al. (1989). Acta Cryst. A45, 494–499]. In particular, the letter e covers certain glide planes which hitherto had no unique symbol, such as those called 'either a or b'. The use of e in th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn unexpected chiral spiro tetramer offers mechanistic insight into an improved sodium cyanide initiated polymerization of n-hexyl isocyanate in tolueneYoshio Okamoto, Yoshikazu Nagamura, Koichi Hatada, Chetan Khatri, and Mark M. GreenCite this: Macromolecules 1992, 25, 20,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Fatty Acid Esters and Hydroxy Ketones from Fruits of Laurus nobilisS. N. Garg, M. S. Siddiqui, and S. K. AgarwalCite this: J. Nat. Prod. 1992, 55, 9, 1315–1319Publication Date (Print):September 1, 1992Publication History Published online1 July 2004Published inissue 1 Sep…
The minerals constituting the wodfinite group are isostructural oxides, with the general formula ABC20s (Z = 4); A = Mn2+, Fe2+, Li, Q B = Sn +, Ti, Fe3+, Ta; C = Ta, Nb. A classification system based on the chemistry of the A-and B-cation sites has been devised; it uses chemical modifiers in conjunction with the root…
Abstract The crystal structure of klyuchevskite, K 3 Cu 3 (Fe,Al)O 2 (SO 4 ) 4 , was determined in space group I2 using the total of 715 independent reflections up to R 0.12. Klyuchevskite is a structural analogue of piypite (caratiite) K 4 Cu 4 O 2 (SO 4 ) 4 MeCl with the substitution K + + Cu 2+ → (Fe 3+ ,Al) + MeCl…
Oriented thin films of barium hexaferrite, BaFe/sub 12/O/sub 19/, were grown in situ on (0001) sapphire substrates utilizing a pulsed laser deposition technique. X-ray diffraction, elastic backscattering spectrometry, ferrimagnetic resonance, and vibrating sample magnetometry confirm that the structure, composition, a…