Materials Literature
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The room-temperature reflectance of evaporated amorphous selenium films was obtained between 4 and 14.4 eV. The reflectance spectrum was the same for fresh samples evaporated onto substrates held at 10°, 24°, and 60°C; however, aged selenium films had a 25% lower reflectance between 9 and 14 eV while between 4 and 5 e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformations and crystal packing. The crystal and molecular structure of trans-bis(2,4-pentanedionato)dipyridinenickel(II), Ni(AA)2(py)2Richard C. ElderCite this: Inorg. Chem. 1968, 7, 11, 2316–2322Publication Date (Print):November 1, 1968Publication History Published onlin…
The structural, dielectric, and piezoelectric properties of the solid solution (Na 1‐x ,Li x ,)NbO 2 were studied. Solid solution ceramics with x values up to 0.14 occur as a single phase. The phase diagram from 0° to 600°C is given. The low‐temperature phase has a perovskite pseudo‐monoclinic structure and inverts to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIon-exchange equilibriums between glass and molten saltsHarmon M. GarfinkelCite this: J. Phys. Chem. 1968, 72, 12, 4175–4181Publication Date (Print):November 1, 1968Publication History Published online1 May 2002Published inissue 1 November 1968https://pubs.acs.org/doi/10.102…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTManganese porphyrin complexes. I. Synthesis and spectroscopy of manganese(III) protoporphyrin IX dimethyl ester halidesLaurence J. BoucherCite this: J. Am. Chem. Soc. 1968, 90, 24, 6640–6645Publication Date (Print):November 1, 1968Publication History Published online1 May 20…
The diffusion of oxygen in monocrystalline ScaO 3 , YzO 3 , Dy,O 2 , HosO 3 , Er 2 O 3 , Tm 2 O 2 , and Lu 2 O 3 was measured by a thermobalance technique. The reoxidation of partially reduced crystals of these materials was treated as a diffusion‐controlled process with a moving boundary. Large diffusion coefficients…
To examine the conditions brought about upon initiation of core spraying, a 36-rod assembly was heated to different temperatures and then spray cooled. The runs were made at atmospheric pressure using two kinds of assemblies, both made up of heater rods of 15 mm outer sheath diameter, arayed into 6×6 lattice accommoda…
It is shown theoretically that nematic liquid crystals in magnetic fields may display alignment inversion walls partially similar to Bloch and Néel walls in ferromagnetics.Received 25 September 1968DOI:https://doi.org/10.1103/PhysRevLett.21.1518©1968 American Physical Society
Single-domain particles of Fe3O4 have been observed to exhibit superparamagnetic behavior with the Mössbauer effect. Using a simple theory for the spin relaxation, it was possible to make an approximate curve fit of the spectra, taking into account the particle-size distribution of the samples. For a sample prepared b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeformation and Breakup of Liquid Droplets in a Simple Shear FieldH. J. Karam and J. C. BellingerCite this: Ind. Eng. Chem. Fundamen. 1968, 7, 4, 576–581Publication Date (Print):November 1, 1968Publication History Published online1 May 2002Published inissue 1 November 1968ht…
The dilatations (negative) caused by neutrons, 40–600 keV electrons, 140 keV H+, D+, He+, and gamma rays are given as a function of dose and are compared. The presaturation dependence is linear for neutrons, He+, and D+, and depends on the 0.5–0.7 power of dose for H+, electrons, and gamma rays. The dilatations are no…
Abstract If the collagen triple helix is so built as to have one set of NH ⃛ O hydrogen bonds of the type N 3 H 3 (A) ⃛ O 2 (B), then it is possible to have a linkage between N 1 H 1 (B) and O 1 (A) through the intermediary of a water molecule with an oxygen O leading to the formation of the hydrogen bonds N 1 (B) ⃛ O…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectroscopy of sulfur, sulfur-selenium, and sulfur-arsenic mixturesAnthony T. WardCite this: J. Phys. Chem. 1968, 72, 12, 4133–4139Publication Date (Print):November 1, 1968Publication History Published online1 May 2002Published inissue 1 November 1968https://pubs.acs.…
Abstract By making use of the vapor-condensation type calorimeter, the heat capacity measurements of amorphous, cubic and hexagonal ices were made between 20°K and 250°K. The glass transition phenomenon was found near 135°K with the sudden change of the heat capacity amounting to 35 J/(mol°K). The drastic crystallizat…
Anomalies found in the intensity of $p$-polarized light from concave diffraction gratings have been analyzed in terms of an interaction between the incoming photon and a surface-plasmon resonance in the grating surface. There is clear evidence for zone gaps in the dispersion curves which we have constructed for surfac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of hydrogen with alloys of magnesium and nickel and the formation of Mg2NiH4James J. Reilly Jr. and Richard H. Wiswall Jr.Cite this: Inorg. Chem. 1968, 7, 11, 2254–2256Publication Date (Print):November 1, 1968Publication History Published online1 May 2002Published i…
An optical emission process is observed in which a ${\mathrm{Cr}}^{3+}$ ion, initially in the $^{2}E_{\mathrm{g}}$ excited state, simultaneously emits a photon and excites a neighboring ${\mathrm{Eu}}^{3+}$ ion to an excited $^{7}F_{J}$ level. Transitions terminating on $J=1$ through 5 have been found.
The Brillouin-scattering spectrum of K${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$ has been studied over the temperature range $118\ifmmode^\circ\else\textdegree\fi{}\mathrm{K}<T<300\ifmmode^\circ\else\textdegree\fi{}\mathrm{K}$ with particular emphasis on the region close to the ferroelectric transition at 122\ifmmode…
We introduce a simple model Hamiltonian for the study of phase transitions in perovskite compounds $\mathrm{AB}{\mathrm{O}}_{3}$ involving rotations of $B{\mathrm{O}}_{6}$ octahedra. Depending on the relative magnitude of the anharmonic coefficients, we find a transition to the tetragonal or to the trigonal phase. We…
The electrical resistivity was determined for polycrystalline and single-crystal BeO between 1200°–1700°C. Analysis was made of the effects of oxygen partial pressure, aliovalent impurities, and microstructure. Conductivity and relevant diffusion coefficients were calculated with these data. The results show the BeO s…