Materials Literature
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ZrW 2 O 7 (OH,Cl) 2 ·2H 2 O has been synthesised by refluxing, followed by hydrothermal crystallisation of amorphous zirconium tungstate gels in 1–8 m HCl. It is known that the amorphous Zr tungstate can be used as a gel-generator for production of the 188 Re medical radioisotope. The structure of ZrW 2 O 7 (OH,Cl) 2…
Long-term aging experiments were carried out for Sm/sub 2/(Co,Fe,Cu,Zr)/sub 17/ permanent magnets at 300 and 400/spl deg/C and both traditional and application-oriented characterizations were performed. Results of application-oriented characterizations show that the maximum energy product of the magnet at 300/spl deg/…
Structures of (Ca2-x/2_??_x/2)(Si1-xPx)O4 crystals were examined as a function of x ranging from 0.03 to 0.40. All of the samples were heated at the stable temperature region of the α-phase and then quenched in water. The phase constitution at ambient temperature was classified into three categories according to the f…
Using the embedded atom method interatomic potential, all Σ < 50 tilt boundaries for hcp Ti with [0001] orientation are calculated by the method of molecular statics. Based on the atomic positions analysis, the structural units of dislocation cores are indicated. It is found that the atoms at the interfaces tend to fo…
[V 14 O 36 F 4 ] 8- polyanions are built up from two trimers of three edge-sharing VO 5 F octahedra, two dimers of two square pyramids related by their basal plane, two VO 4 tetrahedra and two VO 4 F trigonal bipyramids; between them are intercalated water molecules and diprotonated amines which stabilize the structur…
The spinning of core-spun yarn on the ring frame is a technique used to upgrade the cotton yarn properties. In a core-spun yarn, a filament is covered by a staple fibre. In the current paper the structural and mechanical properties of core-spun yarns produced with a 2.2 tex monofilament core and a cotton wrap on a mod…
Water-insoluble porphyrins dissolve in aqueous solutions of amphiphilic polymers to give systems which mimic the action of peroxidase enzymes.
Colloidal suspensions of charge-stabilized polystyrene latex spheres in near-critical mixtures of 2,6-lutidine and water aggregate reversibly on the side of the coexistence curve rich in the nonpreferred liquid. We have used static light scattering and a Zimm analysis to determine the second virial coefficient ${\math…
Two dithiadiazolyl radicals of formula [F 2 C 6 H 3 CNSSN] ˙ were prepared and characterised by X-ray crystallography; in the solid state the 2′,3′-difluoro isomer forms discrete twisted dimers through a spin-paired singly occupied–singly occupied molecular orbital interaction with an intra-dimer S · · · S distance of…
Abstract Three novel unsymmetrical vanadyl dodecakis(2,2,2‐trifluoroethoxy)phthalocyaninates with nitro, amino or with no substitution were synthesized by a statistical condensation of 3,4,5,6‐tetrakis(2,2,2‐trifluoroethoxy)phthalonitrile with 4‐nitro, 4‐amino or 4‐unsubstituted phthalonitrile, and separated by common…
A new compound of formula [Cu 2 L 2 ][tcnq] 3 has been obtained where L 2 is the Robson-type binucleating macrocyclic dianionic ligand obtained by condensation of 1,3-diaminopropane and 2,6-diformyl-4-trifluoromethylphenol and tcnq is tetracyanoquinodimethane. A comparison of the spectroscopic, conducting and magnetic…
Hydrolytically unstable d 3 [Mn IV (CN) 6 ] 2- as the [N(PPh 3 ) 2 ] + salt is crystallographically, spectroscopically, and magnetically characterized.
The presence of copper and vanadium in ceria at different concentrations gives solids with different characteristics which vary with calcination temperature. At low copper and vanadium concentrations, only the CeO2 phase is formed. When the concentration of copper is relatively high compared to vanadium, a CuO phase a…
Adsorption of polyethylenimine (PEI) of different sizes on swollen delignified pulp fibers indicates that for PEI molecules of diameter smaller than 25 nm, the accessible internal surface area within the pores in the cell wall is independent of the size of the PEI molecule. This suggests that a minimum pore radius R.…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of Fine-Powder Polycrystalline Bi−Se−Te, Bi−Sb−Te, and Bi−Sb−Se−Te AlloysJoseph J. Ritter and Pichai MaruthamuthuView Author Information Ceramics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 Cite this: Inorg. Chem. 1997, 36, 2…
As W-type hexagonal ferrite permanent magnets with the formula SrO⋅2FeO⋅8Fe2O3 contain both ferrous and ferric oxides, a complicated atmosphere control during the sintering process is necessary in manufacturing, which is impractical for industrial production. Thus, a simple manufacturing method which is characterized…
Abstract X‐ray powder diffraction data were obtained for Cu 3 In 5 Se 9 and Cu 3 Te 9 , which were found to crystallize in orthorhombic and tetragonal systems, respectively. The electrical resistivities and Hall mobilities of these compounds were investigated in the temperature range 35–475 K. Cu 3 In 5 Se 9 , was ide…
We have investigated the effect of low-molecular mass species on the space charge behavior such as space charge distribution and electrical conduction of LDPE (low density polyethylene). We also attempted to explain the relationship between the space charge distribution and electrical conduction. The heterocharge, con…
The effects of solvents on the surface properties of oxygen plasma-treated polyethylene and polypropylene films have been studied by ESCA, contact angle measurement, and adhesion testing. The results show that oxygen plasma treatment produces some low molecular weight materials (LMWM) on the treated surfaces, which ca…
A poly(amic acid) (PAA) was prepared by ring-opening polyaddition of 4, 4′-hexafluoroisopropyridenebis(phthalic anhydride) and 1, 3-bis(4-aminophenoxy)benzene. The PAA film was very soluble to a tetramethylammonium hydroxide (TMAH) aqueous solution, whereas the dissolution inhibitor, 2, 3, 4-tris(1-oxo-2-diazonaphthoq…