Materials Literature
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Orthorhombic CuFe 2 S 3 is weakly ferromagnetic. The magnetic susceptibilities of single-crystal and polycrystalline specimens have been determined at temperatures between 78 and 500 °K. A model is presented to explain the weak ferromagnetism.
X-ray photoelectron spectra of Na and Li metals were obtained in ultrahigh vacuum. Rich plasmon structures were observed on all peaks. Both the photoemission and Auger peaks showed large extra-atomic relaxation energies. A simple "equivalent-cores" screening model predicts extra-atomic relaxation energies in good agre…
Model calculations are presented which indicate that the character of the nematic-isotropic phase transition can be continuously changed from first to second order and that a new biaxial liquid crystal phase can be obtained by mixing suitable platelike and rodlike molecules. Precursors of the predicted behavior should…
The Fourier amplitude method developed in Paper I as a diagnostic tool for determining the sensitivity of the results of complex calculations to the parameters which enter these calculations has been applied to two chemical reaction systems involving sets of coupled, nonlinear rate equations. These were: (a) a five re…
The nonrelativistic augmented-plane-wave (APW) method is applied to calculate the electronic band structures of several transition-metal-dichalcogenide ($T{X}_{2}$) layer compounds, including materials with the $C6(1T\ensuremath{-}\mathrm{Hf}{\mathrm{S}}_{2},1T\ensuremath{-}\mathrm{Ta}{\mathrm{S}}_{2})$, $C27(2H\ensur…
We report a new technique for studying the effect of uniaxial stress and hydrostatic pressure on the N\'eel temperature of antiferromagnets. Using magnetoelectric susceptibility measurements, we studied the shift in the N\'eel temperature ${T}_{\mathrm{N}}$ of ${\mathrm{Cr}}_{2}$${\mathrm{O}}_{3}$ caused by an externa…
Scanning electron microscopy (SEM), invented 20 years ago, primarily gives three-dimensional surface details on a screen or photograph at magnifications comparable to a transmission electron microscope (TEM). Scanning electron microscopy may in time replace TEM, since excellent transmission micrographs can now be made…
Abstract Many attempts have been made in the past to bring order to the near-bewildering array of eutectic morphologies. These have met with limited success due mainly to the fact that the morphology of a particular eutectic may be highly dependent on both chemical composition and the rate of freezing. This paper show…
The results presented in the preceding section indicate several interesting trends. In the case of polyethylenes, one notes that the proportionality between dielectric constant and density relationship is obeyed as long as the molecular weight distributions of the polymer system are of the same modality. The dielectri…
X-ray powder data are given for Y3In2Ga3O12 and Ya3Sc2Ga3O12. The refined cell parameters are 12.548 and 12.482 A, respectively.
The distortion of longitudinal pulses in slightly curved elastic rods is discussed in terms of an elementary theory in which the effects of rotary inertia and radial shear are neglected. Moreover, when the wavelength of the pulse is long enough, practically all the bending effects can be justifiably neglected. The exp…
Boron carbide possessing porosities of 91 and 77%T.D. were irradiated at about 300°C to 6.0x1018∼ 3.3×1019 n/cm2 in helium atmosphere. The thermal conductivity, the electric resistivity and the linear thermal expansion were determined. Upon irradiation to 3.3×1019 n/cm2, cracking occurred in all of the 91%T.D. specime…
It has been observed that Barkhausen noise is quite low in the Rayleigh region and that it appears rather abruptly when the hysteresis loop departs from the Rayleigh region. These facts are explained in terms of the interaction between domain walls and crystalline defects. Only defects which have saturated (pressure i…
A refractometer has been constructed which is capable of measuring refractive indices of infrared transmitting materials to an accuracy of +or-0.0001. Samples are used in the form of Littrow prisms and a precision goniometer incorporating a radial moire grating provides the method for angle measurement.
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text David C. Brown, "Parasitic Oscillations in Large Aperture Nd3+:Glass Amplifiers Revisited," Appl. Opt. 12, 2215-2217 (1973) Export Citation BibTex Endn…
The stress relaxation modulus in compression of a container glass was investigated over a wide range of strain, time, modulus, and temperature. The glass is a linear viscoelastic liquid up to 2% strain, and the modulus is a smooth function of time, with no pseudorubbery plateau apparent down to a modulus of 10° dynes/…
The orientation crystallization behavior of natural rubber vulcanizates was investigated by means of a dynamic X-ray diffraction technique utilizing the half-circle sector technique. The frequency dependence of dynamic diffraction intensities from diatropic and paratropic crystal planes, (002) and (200) planes, was ob…
The deformation produced by point loading on the cleaved basal surfaces of graphite crystals has been studied in the scanning electron microscope. The experiments were of two types, viz. sliding and static contact. In the first a small tungsten stylus (tip radius ∼ 1 μm) was slid on the graphite surface inside the sca…
Preliminary to detailed amino acid sequence analysis of the peptide α1‐CB7 from calf skin collagen, the chymotryptic, tryptic and thermolytic peptides were isolated and their positions in the intact chain determined. The collagenase derived peptides α1(78), α1(125) and α1(78)‐CBN were also used as source of peptides a…
Abstract Unstable carbonyl ion Ag(CO)n+ was prepared from Ag2O, Ag2SO4 or AgClO4 and carbon monoxide in H2SO4 or H2SO4–SO3 solution. The value of ″n″ was 0∼ 2.0 at −10∼30°C, under CO pressure of 1∼19 atm.