Materials Literature
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Silicon carbide was hot‐pressed to uniform densities of the order of 98% of the theoretical density, with slight additions of aluminum and iron aiding in this densification. Other elements having some effect were lithium, calcium, chromium, zirconium, and boron. This dense silicon carbide had very high strength at hig…
Abstract The preferential orientation of the carbon planes in blocks of graphite prepared by extrusion or pressing is described in terms of an orientation function and it is shown how this varies with the particle size of the starting materials. An ‘anisotropy factor’ is defined as a useful index of the material. A di…
A modified Landau-Lifshitz equation is solved for a single-domain sphere and an infinitely-wide thin single-domain sheet of ferromagnetic material neglecting anisotropy. The external magnetic field is switched from one direction to its opposite instantaneously at the initial time and the behavior of the magnetization…
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Por vía teórica también experimentalmente se llega a la conclusión de que, en general, es conveniente elevar la cifra máxima SO3 mantenida en la actualidad en la mayor parte de las normas para cemento. Esta medida es particularmente beneficiosa en el aspecto de la retracción.
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Abstract The infrared spectrum of polyvinyl alcohol has been investigated between 3600 and 70 cm. −1 . Polarization measurements on stretched specimens were made down to about 330 cm. −1 . The spectrum of a deuterated specimen (about 90% of the OH having been replaced by OD) has also been obtained. These data confirm…
The intermetallic compound, BiMn, has been studied by neutron diffraction at temperatures from 4.2\ifmmode^\circ\else\textdegree\fi{}K to 733\ifmmode^\circ\else\textdegree\fi{}K (460\ifmmode^\circ\else\textdegree\fi{}C). In the temperature range 340-360\ifmmode^\circ\else\textdegree\fi{}C to 445\ifmmode^\circ\else\tex…
Various kinds of silica glass and natural and synthetic crystals have been irradiated with fast neutrons at temperatures of ∼250°C and above 300°C. In the glasses, asymmetric paramagnetic resonance lines resulting from the irradiation have been observed with apparent g values of 2.0013±0.0006 and 2.0090±0.0007, and ha…
Porous structures having a continuous solid phase with isolated pores were prepared by the addition of different amounts of crushed naphthalene to an alumina casting slip. Samples of from 5 to 50% porosity were fired together for comparable grain development, eliminating structural variables except porosity. Effects o…
The conduction-electron magnetic susceptibility of graphite has been calculated by using the Wallace two-dimensional band structure. The energy levels induced by the magnetic field are calculated by the method of Luttinger and Kohn, taking into account the large (in this case) effects of band-to-band transitions which…
The magnetic susceptibility of a powder sample of $\ensuremath{\alpha}\mathrm{MnS}$ was measured from 90\ifmmode^\circ\else\textdegree\fi{}K to 800\ifmmode^\circ\else\textdegree\fi{}K by an absolute Gouy method. The N\'eel temperature was found to be 154\ifmmode^\circ\else\textdegree\fi{}K. There was no evidence of th…