Materials Literature
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Mechanism of formation of iron sulfide film during corrosion of Armco iron by liquid phase H2S-CO2-H2O and H2S-CO2-H2O-iron sulfide systems has been studied. Weight loss, weight of film remaining on the metal, number of blisters formed and chemical composition, as determined by electron diffraction, were measured as a…
Dielectric measurements and X‐ray diffraction studies were made in the system BaTiO 3 ‐BaHfO 3 for polycrystalline specimens containing from 0 to 30 mole % BaHfO 3 . The maximum in the dielectric constant for each composition in creased as the BaHfO 3 concentration was in creased to 16 mole % and then decreased with f…
H. J. Goldsmid London: Temple Press Books Ltd. 1964. Pp. x + 240. Price 70s. This book starts with an analysis of the behaviour of a thermojunction as a means of refrigeration, introduces the ‘figure of merit’, and proceeds with an account of the specific heat of solids, their thermal conductivity and band structure,…
"Physics of Nuclear Kinetics." Nuclear Science and Engineering, 22(4), p. 500 Additional informationNotes on contributorsW. Rudolph KanneAbout the Reviewer: W. Rudolph Kanne received his PhD in physics at the Johns Hopkins University in 1937. Before joining the General Electric Company in 1946, he was associated with…
Buckling load of cylindrical shell with asymmetric and axisymmetric imperfections and calculation of upper bound to buckling load for shell with axisymmetric imperfections
The technique of transmission electron microscopy has been used to study neutron irradiation damage in α -iron. Foils were irradiated to a fission neutron dose of ∼ 2 × 1020 cm−2 at 60°c and the effects of annealing up to 500°c on the micro-hardness and structure were studied. The irradiated foils contained visible po…
The system MgO‐ZnO‐Sio 2 was studied by the quenching technique. No ternary compounds were found in the system, but extensive solid solution relations occurred in the magnesiumand zinc‐bearing compounds. Two ternary eutectics and one reaction point were located; the minimum melting point in the system was 1370°± 5°C a…
The index matching technique of Giordmaine and Maker has been extended to include the more general three-wave interaction. Two fundamentally different experimental arrangements may be considered; one has the two low frequency waves in parallel polarizations and the other has these waves in orthogonal polarizations. Th…
The frequency/wave-vector dispersion relation for normal modes of vibration propagating along the [00ζ], [ζζ0], and [ζζζ] directions in uranium dioxide at 296 °K has been determined by studying the coherent one-phonon scattering of slow neutrons from a single-crystal specimen. Analysis of the results shows that a simp…
The outer s- and p-electron overlap integrals involving ns, npσ, and npπ orbitals have been computed for all combinations of ion pairs in all of the alkali halide lattices. The free-ion closed-shell Hartree—Fock wavefunctions were used in all calculations. The halogen—alkali (H—M) overlaps are listed at the equilibriu…
Transformation of three commercial anatase powders resulted in sigmoid curves of transformation vs. time, which were interpreted in terms of a nucleation‐growth process. Analysis of these curves by several rate laws led to activation energies for nucleation of 109, 136, and 148 kcal/mole and for growth of 100, 115, an…
CONTENTS I. Methods of synthesising polyethyleneimine 516 II. Polymerisation of aziridine 516 III. Thermal decomposition of 2-oxooxazolidine 520 IV. Properties of polyethyleneimine 522 V. Reactions of polyethyleneimine 523 VI. Copolymers of aziridine 525
A series of carbon-14 measurements of 18th- and 19-century wood revealed an excellent correlation between the variations in carbon-14 content and average sunspot activity. It seems probable, therefore, that the predominant cause of the short-term fluctuations in carbon-14 activity is the variability of solar activity.
Abstract: A limited study of the compound U₃Si₂ has been made in reference to its use as a prospective nuclear fuel in sodium cooled reactors.
Abstract E.p.r. and endor spectra have been measured in ThO2 containing Tb4+. The crystalline electric field is cubic, and the splittings are very large compared with other S state ions. The values of the parameters in the standard cubic spin-Hamiltonian are: g = 2·0146 ±0·0004, 60B4 = —2527·53 ±0·10 Mc/s, 1260B6 = —2…
We show that the x-ray scattering from an electron gas in the large-momentum-transfer regime ($k\ensuremath{\gg}\frac{{P}_{F}}{\ensuremath{\hbar}}$) is a direct measure of the one-dimensional momentum distribution of the particles (including correlations). If the recoiling electron's momentum is measured in coincidenc…
The thermal conductivities of $\ensuremath{\beta}$-rhombohedral boron, orthorhombic (black) phosphorus, and orthorhombic sulfur have been measured down to 3\ifmmode^\circ\else\textdegree\fi{}K. These results, as well as some from the literature on cubic (white) phosphorus and on boron carbide, have been interpreted by…
Recent studies on x-ray and electron-excited luminescence (cathodoluminescence) in natural and synthetic diamond provide evidence that the previously reported band-$A$ luminescence is due to the radiative recombination across the indirect energy gap of electrons and holes separately trapped at donor and acceptor cente…
In previous papers we have formulated the theory of magnetostriction arising from single-ion crystal-field effects, for cubic crystals, and we have shown that the theory accounts extremely well for the temperature dependence of the magnetostriction in yttrium iron garnet. We here summarize that theory, extend it to ar…
Proton magnetic resonance spectra of a number of paramagnetic Ni II chelates of the type NiL1L2 where L1 and L2 are different aminotroponeimine ligands have been examined. The proton resonances show large hyperfine contact interaction shifts due to delocalization of spin density from the metal to the ligand by dπ—pπ b…