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It has been shown that in zone-refined aluminium, under specific quenching conditions, regions of stacking fault bounded by dislocation loops with a 1/3 [111] Burgers vector can be formed. The same type of defect can be produced by multiply quenching 99•995% aluminium. Repeated quenching therefore produces effects sim…
Abstract The mechanics of extension of plant fibers is considered in terms of a spiral arrangement of crystalline fibrils embedded in a noncrystalline matrix. Deformation may take place either by stretching of the fibrils or by extension such as that of a spiral spring. In the latter, the major resistance comes from t…
Rapid diffusion along dislocation cores generally enhances the average bulk diffusion in a dislocated crystal. If each diffusing atom has at least several opportunities to make rapid excursions along various dislocation cores, Hart has shown that DT/DT0 = 1+fDP/DT0. DT is the average bulk diffusivity, DT0 is the diffu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPREPARATION AND STUDY OF ORDERING IN A(B′0.33Nb0.67)O3 PEROVSKITE-TYPE COMPOUNDSFrancis. Galasso and Jane. PyleCite this: J. Phys. Chem. 1963, 67, 7, 1561–1562Publication Date (Print):July 1, 1963Publication History Published online1 May 2002Published inissue 1 July 1963http…
Danysz, M; Garbowska, K; Pniewski, J; Pniewski, T; Zakrzewski, J A; Fletcher, E R; Lemonne, J; Renard, P A; Sacton, J; Toner, W T; O'Sullivan, D; Shah, T P; Thompson, A; Allen, P; Heeran, M; Montwill, A; Allen, J E; Beniston, M J; Davis, D H; Garbutt, D A; Bull, V A; Kumar, R C; March, P V
Since aluminum and germanium are two of the most easily incorporated impurities in crystalline quartz, the relationship of the color centers produced by x irradiation to these elements has been studied extensively. Previous work based on irradiation at 300°K has indicated that one type of electron-deficient center is…
The results are reported of calculations on H, H2, He, Be, N, and NH in bases of Gaussian elementary atomic orbital functions. Such functions, though physically less satisfactory than the customary Slater exponential functions, have the advantage that all integrals can be evaluated exactly by closed analytical formula…
Hyperfine fields and isomer shifts of ${\mathrm{Fe}}^{57}$ in the Fe-Rh system have been investigated by the M\"ossbauer technique in the composition range between 0 and 52 at.% Rh. When the Rh concentration exceeds 20%, chemical ordering of CsCl type develops and two distinct hyperfine fields are observed, correspond…
Abstract The deformation of a foamed elastic material, both in tension and compression, and its resistance to tearing and to tensile rupture, have recently been derived on the basis of a model consisting of a large number of thin threads joined at their ends to form a three-dimensional network. A general account of th…
Since the late 19th century, carbon (CO) has been known to be present in of normal man and animals. The origin in blood, however, has not been entirely Although it might be assumed that all CO is absorbed from the environment, thors have thought that some, at least, endogenously. The difficulties in de whether blood C…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarographic Oxidation Potentials of Aromatic CompoundsE. S. Pysh and N. C. YangCite this: J. Am. Chem. Soc. 1963, 85, 14, 2124–2130Publication Date (Print):July 1, 1963Publication History Published online1 May 2002Published inissue 1 July 1963https://pubs.acs.org/doi/10.10…
The thermoelectric power ($\ensuremath{\alpha}$) of $p$-type SnTe has been measured between room temperature and 450\ifmmode^\circ\else\textdegree\fi{}C for apparent hole concentrations (${p}^{*}=\frac{1}{e{R}_{300}}$) between 1\ifmmode\times\else\texttimes\fi{}${10}^{20}$ and 1.8\ifmmode\times\else\texttimes\fi{}${10…
Polycrystalline black phosphorus has been produced by the Bridgman method of combined temperature and pressure and found to be p type with room-temperature resistivity around one Ω-cm, in agreement with the observations of previous workers. From 300° to 700°K, the resistivity can be fitted by an expression ρav=4.6×10−…
The present status of our knowledge of the structure of the spectra of the doubly and triply ionized spectra of the rare earths is derived partly from experimental data of the emission spectra of the free ions which provide the energy level scheme in great detail but are difficult and laborious to analyze. For the low…
Abstract Three-dimensional neutron structure factors have been measured on single crystals grown from the melt and from solution. The Bragg reflexions divide into three groups, strong, medium and weak: the strong and medium reflexions are affected by extinction, which is particularly severe for solution-grown crystals…
Abstract The mean-square thermal displacements of the atoms in U 0 2 and T h 0 2 have been determined as a function of temperature from the analysis of two-dimensional diffraction data. In the range investigated, 20 to 1100°C, the oxygen atoms vibrate more strongly than the metal atoms and at each temperature the disp…
Investigations of the primary energy dependence of the rate of production of secondary electrons by relativistic primary electrons, and of the nature of the secondary energy distributions, were conducted. The "sandwich" arrangement, characterized by the feature that the primary beam is essentially monoenergetic while…
The theoretical equations of Inokuti of the preceding paper are applied to the interpretation of data obtained during the irradiation of isotactic and atactic polypropylene, and poly-(1-pentene) and poly-(1-hexene). Inokuti's modified Charlesby—Pinner function calculated for initial values of the Mw/Mn ratio greater t…
Magnetostriction along the axes in Dy and Ho was measured in magnetic fields up to 26 kgauss and parallel to the plane of the metal disks. Maximum linear strains ( DELTA l/l) of 7500 x 10/sup -6/and 3500 x 10/sup -6/ were observed for Dy and Ho, respectively. Strain dependence on magnetic field strength for both metal…
A detailed three-dimensional refinement of the structure of hexagonal silver iodide from room-temperature photographic data showed very little deviation from the ideal wurtzite-type structure. Using anisotropic temperature factors a final R value of 6.6% was obtained. The space group is P63mc, a=4.592, c=7.510, c/a=1.…