Materials Literature
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The crystal structures of five ω-phthalimidoaliphatic carboxylic acids are reported: 2-phthalimidoethanoic acid, C10H7NO4 (I), 3-phthalimidopropanoic acid, C11H9NO4 (II), 4-phthalimidobutanoic acid, C12H11NO4 (III), 5-phthalimidopentanoic acid, C13H13NO4 (IV), and 6-phthalimidohexanoic acid, C14H15NO4 (V). Hydrogen bo…
This paper presents results of sub-element testing conducted to characterize the effects of survivability features and load rate upon the mechanical properties and failure mechanisms of composite structural details. Laminate and joint sub-element evaluations consisted of strength and toughness testing of open-hole fra…
Ba hexaferrite samples having average particle sizes in the range from the tens up to the thousands of nm have been prepared by using conventional ceramic techniques and the exothermic reaction between Ba and Fe nitrates and oxalic dihydrized acid. The magnetic characterization of these samples included the measuremen…
We have successfully prepared a new nanocomposite magnet consisting of a mixture of a magnetically hard Pr2Co14B phase and a soft Co phase using the technique of melt spinning. The final microstructure with the above phases is formed after annealing the melt-spun ribbons through an intermediate transformation to the m…
The magnetic hardening of melt–spun Sm2Fe17Cx was studied and the coercivity of 4.6 kOe for Sm2Fe17C1.5 alloys was reported a few years ago. Recently, we have succeeded in preparing single-phase compounds of Sm2(Fe, M)17Cx (M=Ga, Al, or Si) with high carbon concentration by arc melting. It was found that the substitut…
The study of photoluminescence band-tail-localized excitons in ${\mathrm{ZrS}}_{3}$ and in its solid solution ${\mathrm{Zr}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Hf}}_{\mathit{x}}$${\mathrm{S}}_{3}$ confirms the existence of two polytypes for these one-dimensional materials. Fitting of the spectra, with a mo…
A nematic liquid crystalline cell utilizing a substrate coated with polyvinylcinnamate was subjected to UV polarized light in the presence of a magnetic field. After removing the cell from the field it was found that the pretilt angle was large and both temporally and thermally robust. Irradiation in the absence of a…
Micromagnetic finite element calculations using a magnetic vector potential to treat long-range dipolar interactions describe the interactive magnetization processes which determine the magnetic properties of fine-grained magnetic materials. Micromagnetic models give a quantitative treatment of the correlation between…
The \ensuremath{\pi}-band structure of one-dimensional carbon nanotubes is very special. Their ballistic transport properties are studied theoretically and are found to exhibit rich magnetic-flux-dependent structures. The thermal conductance \ensuremath{\kappa}(\ensuremath{\varphi}) has many step structures caused by…
The ordered structure of at 70 - 75 K has been studied by time-resolved neutron powder diffraction. The ordered superlattice has a structure with approximately four full D sites and one vacant D site in successive (420) planes, which is consistent with previous observations. Several superlattice lines not reported in…
The critical state (Bean) model for superconducting hysteresis is discussed for arbitrary specimen shapes and complex flux distributions. It is demonstrated that this model exhibits the ‘‘wiping out’’ property and ‘‘congruency’’ property of minor hysteresis loops. This leads to the conclusion that the critical state m…
In this paper, we have investigated experimentally the approach to the anhysteretic surface in M–H–σ space. In particular, for a 0.5 wt% carbon steel specimen, we have applied 73 MPa tension and a bias field H and determined the end flux density after superimposing an ac field of amplitude gradually decreasing to zero…
The Curie temperatures of several Nd2Fe17-based intermetallic compounds are calculated based on the spin-fluctuation model of Mohn and Wohlfarth and the band structure results calculated using the self-consistent orthogonalized linear combinations of the atomic orbitals method in the local spin density approximation.…
Magnequench NdFeB powders having high and low rare earth contents were explosively compacted to obtain cylindrical magnets. The magnetic properties were found to be isotropic and were superior to conventionally consolidated isotropic magnets. The (BH)max was 14.7 MGOe and the remanence was 8.7 kG for the explosively c…
Interpretation of Henkel plots in terms of the Preisach model is revisited. The Preisach model is treated as a purely phenomenological one and the Henkel plots are directly related to experimental data, namely, to the first-order transition curves.
Differential scanning calorimetric (DSC) studies have been carried out in an attempt to explain the composition dependence of the thermal crystallization behaviour of glasses. It is seen that these glasses exhibit a single glass transition and single-stage crystallization on heating. The glass transition temperature,…
Magnetic properties of YFe2 and its deuterides YFe2Dx have been investigated in the temperature range 300<T<800 K. Both the lattice structure and the Curie temperature Tc show strong dependence on the deuterium composition x. The deuterides have a C15 cubic structure up to x=2.7 and Tc rises from 560 K f…
Power losses in a magnetostrictive actuator have been studied. The system consists of a cylindrical rod of Terfenol-D, a surrounding magnetic circuit to get a homogeneous flux, a mechanical load applied to the rod ends, and an electric coil. We consider transient operating conditions with time-varying driving voltage.…
α-Fe powder has been ball milled at room temperature in an anhydrous ammonia atmosphere for various times. The composition and structure of milled powders was investigated using x-ray diffraction spectroscopy, Mössbauer spectroscopy, combustion elemental analysis, and thermal analysis. A high temperature reaction sequ…
The temperature dependence of the specific heat shows that the strong electron-phonon coupling system HfV2 undergoes a structural transformation at 116 K and becomes superconducting around 9 K. The structural instability can be interpreted in terms of a strong electron-phonon coupling and Fermi surface nesting. The st…