Materials Literature
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Summary The fundamental, pore-level mechanisms of foam generation are investigated in monodisperse bead packs. First, direct visual observations identify the following generation mechanisms: lamella leave-behind, gas-bubble snap-off, and lamella division. Then, to ascertain the relative importance of these mechanisms,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacteristics in the reactions of allylsilanes and their applications to versatile synthetic equivalentsAkira HosomiCite this: Acc. Chem. Res. 1988, 21, 5, 200–206Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 May 1988…
A new switching process was observed in surface stabilized ferroelectric liquid crystals. The switching is associated with a third stable state in addition to the well-known bistable states. The appearance of the third state is characteristic of materials with a large spontaneous polarization and is caused by minimizi…
We perform an accuracy analysis of several possible reflectance–difference (RD) configurations that are compatible with standard molecular-beam epitaxy (MBE) growth chambers, and describe in detail an optical-bridge system that can determine relative changes in RD signals as small as 5×10−5 under standard growth condi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational spectra and structure of polyanilineY. Furukawa, F. Ueda, Y. Hyodo, I. Harada, T. Nakajima, and T. KawagoeCite this: Macromolecules 1988, 21, 5, 1297–1305Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 May 198…
The atomic bonding configurations of carbon bonding in diamond and diamondlike thin films are explored using Raman scattering. The general aspects of Raman scattering from composites are presented. Effects are discussed due to crystalline or amorphous structures, large versus microcrystalline domains, and strong optic…
There is now a new series of high-temperature superconductors that may be represented as (A(III)O)(2)A(2)(II)Can-1CunO2+2n where A(III) is Bi or Tl, A(II) is Ba or Sr, and n is the number of Cu-O sheets stacked consecutively. There is a general trend toward higher transition temperatures as n increases. The highest n…
Examination is made of the low d-electron count d 1 and d 2 3d transition-metal-halides and oxyhalides. Their electronic structure is considered with particular emphasis on the approach to delocalisation in these materials. Optical absorption measurements reveal strong unexpected bands overlapping with the standard lo…
Two superconducting phases, ${\mathrm{Tl}}_{2}$${\mathrm{Ca}}_{2}$${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{10+\mathrm{\ensuremath{\delta}}}$ (2223) and ${\mathrm{Tl}}_{2}$${\mathrm{Ca}}_{1}$${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{2}$${)}_{8+\mathrm{\ensuremath{\delta}}}$ (2122), both with onset ${\mathrm{T}}_{\…
This is a theoretical study on the structure and modulus of a composite polymeric network formed by two intermeshing co-continuous networks of different chemistry, which interact on a molecular level. The rigidity of this elastomer is assumed to increase with the number density of chemical crosslinks and trapped entan…
A 2D quasicrystal with a twelvefold rotational axis has been found in rapidly solidified ${\mathrm{V}}_{3}$${\mathrm{Ni}}_{2}$ and ${\mathrm{V}}_{15}$${\mathrm{Ni}}_{10}$Si alloys by means of transmission electron microscopy. The electron diffraction pattern taken along this axis shows no periodicity but a clear twelv…
Transparent conducting amorphous films of SnO2 doped with fluorine are prepared on borosilicate glass plates heated at 400 °C by spray pyrolysis of an aqueous solution of SnCl4 and NH4F. Films of 0.7 μm thick with a sheet resistance of 3 Ω/□ show an average transmittance of 90% along 0.2 to 0.8 μm and consequently lar…
ABSTRACT This paper presents theoretical models to predict the magnitude of the minimum pressure gradient (∇p)min to mobilize foam in two cases. In the first case, foam lamallae form by snap-off at pore throats during simultaneous flow of liquid and gas through the pore space. Percolation theory relates (∇p)min to the…
Nd2Co17 alloy exhibits a saturation magnetization about 30% higher than that of Sm2Co17 at room temperature. However, the former is not a useful material for permanent magnet fabrication due to its basal plane anisotropy near room temperature. In this study, an attempt is made to investigate the effect of partial subs…
Light rare-earth metals are not assumed to form compounds of the CaCu5-type structure with iron. When zirconium was not added, the Th2Zn17-type rhombohedral structure existed in the samples of nominal composition SmFe5 and SmFe7. Samples of nominal composition (Sm1−xZrx)Fe5 and (Sm0.65Zr0.35)Fey were studied by x-ray…
Magnetization measurements have been made on (Y1−xSmx)2 Fe14B compounds with x≤0.1 over the temperature range from 1.5 K to room temperature. The c axis is the easy magnetization direction for pure Y2Fe14B at all temperatures, reflecting the anisotropy of the Fe sublattice. X-ray diffraction analyses on aligned powder…
The origin of high coercivities in as-cast RFe2Ni2B alloys is investigated by correlating the magnetic properties with the microstructure. Hysteresis loop measurements showed high coercivities in samples containing Sm and Er. In SmFe2Ni2B the coercivities could not be measured in a field of 80 kOe at 4.2 K but they de…
Thermal expansion measurements as a function of temperature and magnetic field were carried out on Fe-Ni-Cr and Fe-Ni-Mn alloys. The magnetic contribution to the thermal expansion was determined with respect to the paramagnetic reference samples in the Fe-Ni-Cr and Fe-Ni-Mn series. We observe a general behavior that a…
The present paper is concerned with the development of low-loss grain-oriented silicon steel, and especially with the magnetic properties and domain structures in domain refined grain-oriented silicon steel. The effects of locally induced stress and slight magnetic flux emergence have been examined as possible nucleat…
The mechanism of magnetostriction in rare-earth–transition-metal amorphous films was investigated based on a single ion anisotropy model for rare-earth atoms using a point charge approximation. The theory was compared with the observed magnetostriction in (Gd0.75R0.25)19Co81 films with various rare-earth elements R. T…