A reinvestigation of the crystal structure of thortveitite Sc2Si2O7
Chair conformation of Ring 8 Ring C 3 2 1 1 2 3 4A 1 2 3 4 5A "C ~C Fig. 8. Chairconfiguration of ring B and C.
Materials Literature
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THE OXIDATION OF COPPER FILMS TO CuO0.67
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE OXIDATION OF COPPER FILMS TO CuO0.67Harold Wieder and A. W. CzandernaCite this: J. Phys. Chem. 1962, 66, 5, 816–821Publication Date (Print):May 1, 1962Publication History Published online1 May 2002Published inissue 1 May 1962https://pubs.acs.org/doi/10.1021/j100811a010ht…
Magnetic Moments of Intermetallic Compounds of Transition and Rare-Earth Elements
The effect of adding the rare-earth elements to cobalt, iron, and nickel has been investigated. Antiferromagnetic coupling was found to exist in the cobalt and iron rare-earth compounds. The moment per formula unit of the compound Co5Y is increased when Sm, Pr, and Nd are substituted for yttrium and decreased when Tm,…
Species Equilibria in Nickel(II) Porphyrin Solutions: Effect of Porphyrin Structure, Solvent and Temperature
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpecies Equilibria in Nickel(II) Porphyrin Solutions: Effect of Porphyrin Structure, Solvent and TemperatureWinslow S. Caughey, Ralph M. Deal, Byron D. McLees, and James O. AlbenCite this: J. Am. Chem. Soc. 1962, 84, 9, 1735–1736Publication Date (Print):May 1, 1962Publicatio…
Thermoelectric Figure of Merit of Two-Band Semiconductors
The locus of points on the (α,κ/σT) plane for a two-band (electrons and holes) semiconductor as the concentration of doping agent is changed, is a curve that forms a closed loop, where α is the Seebeck coefficient, κ the thermal conductivity, σ the electrical conductivity, and T the absolute temperature. The value of…
Synthesis of Boron Nitride
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Boron NitrideT. E. O'ConnorCite this: J. Am. Chem. Soc. 1962, 84, 9, 1753–1754Publication Date (Print):May 1, 1962Publication History Published online1 May 2002Published inissue 1 May 1962https://pubs.acs.org/doi/10.1021/ja00868a065https://doi.org/10.1021/ja0086…
Application of a Ferroelectric Material in an Energy Conversion Device
The thermodielectric converter, a device employing a ferroelectric material as the active element in converting thermal to electrical energy, is analyzed. The efficiency and power-handling capacity are calculated for operation of a ferroelectric material in the induced-ferroelectric region on the basis of an idealizat…
Optical Absorption of Arsenic-Doped Degenerate Germanium
The infrared transmission of degenerate arsenic-doped germanium was measured at liquid-helium and at room temperature. The 4.2\ifmmode^\circ\else\textdegree\fi{}K data were used to calculate the energy gap of the degenerate material. For this, two operations were necessary: (1) to subtract the large effect of free car…
Magnetic Study on Mn 4 N and its Related Compounds
In order to obtain some informations on the electronic structure of Mn 4 N, the magnetic properties of Mn 4 N compounds, partially substituted by In and Sn respectively, are studied by a newly devised magnetic torsion balance. These compounds show very complicated temperature- and composition-dependences of saturation…
Ferroelectricity in the CompoundBa2Bi4Ti5O18
Some ferroelectric and crystallographical properties of the compound ${\mathrm{Ba}}_{2}$${\mathrm{Bi}}_{4}$${\mathrm{Ti}}_{5}$${\mathrm{O}}_{18}$ are presented. The compound represents a new structure with the unit cell consisting of one ${\mathrm{Bi}}_{2}$${\mathrm{O}}_{2}^{2+}$ layer and five perovskite layers. From…
Imogolite in some ando soils
Abstract It was reported in a preceding paper7) that the Ando soils from Uemura, Choyo, and Kawanishi contained an unknown mineral colloid which was distinctly different in some respects from coexisting allophane. In the Uemura soil, this clay fraction made up more than 20 per cent of the total clay and more than 6 pe…
Electron transfer spectra of lanthanide complexes
Moderately strong, very broad absorption bands observed in dilute lanthanide bromide solutions in nearly anhydrous ethanol are interpreted as electron transfer from the highest filled M.O. to the partly filled 4f shell in the case of Nd(III), Sm(III), Eu(III), Tm(III) and Yb(III). Good agreement is obtained with a the…
The dynamic properties of carbon black loaded natural rubber vulcanizates. Part II
Abstract The dynamic shear modulus at very high strains, ( G ∞ ), of carbon black filler loaded vulcanizates is regarded as due to the product of two factors: ( a ) a hydrodynamic interaction due to filler particles, and ( b ) a second factor for which evidence is given suggesting that it arises from a few strong link…
Revised Phase Diagram for the System Al 2 O 3 —SiO 2
On the basis of 190 runs made up to 1860°C in sealed noble‐metal containers the following revisions have been made in the equilibrium diagram for the system A1 2 O 3 –SiO 2 . Mullite melts congruently at 1850°C. The extent of equilibrium solid solution in mullite at solidus temperature is from approximately 60 mole %…
An analysis of the solid phase behavior of the normal paraffins
A set of best values for t he te mperatures a nd enthalpies of fusion alld transition for the n-paraffins is presented. From a n a nalysis of these data a general qualitative t heory of the phase behavior of the n-paraffins is developed. Four di stinct. crystal structures-h exagonal, t riclinic, monoclinic, and orthor…
Trap Density Determination by Space-Charge-Limited Currents
Trap depths and densities can be determined from the analysis of the dependence of space-charge-limited currents on applied electric field in insulators. Values obtained from space-charge-limited current measurements are compared with those obtained from thermally stimulated currents and from photocurrent decay on the…
Perturbation Theory for the Fock-Dirac Density Matrix
In Hartree-Fock theory and its various generalizations, it is customary to solve an eigenvalue problem involving an effective one-body Hamiltonian. The eigenvectors determine the Fock-Dirac density matrix, which also appears in the effective Hamiltonian, and solution proceeds iteratively until self-consistency is achi…
Hot Pressing of Potassium‐Sodium Niobates
Compositions in the system KNbO 3 ‐NaNbO 2 have been hot‐pressed to yield ceramics with relative densities greater than 99%. Because these materials lack any degree of pyroplastic behavior, temperatures approaching those required for air sintering are needed. These hot‐pressed specimens exhibit a finer microstructure…
The recrystallization process in some polycrystalline metals
Abstract Electron microscope observations on some polycrystalline metals suggest that after small to moderate deformation, recrystallization occurs by the migration of the original grain boundaries. A theory based on this mechanism can account for the known form of the recrystallization kinetics without necessarily in…
Preparation of Semiconducting Diamonds
P-type semiconducting diamonds can be formed at high pressures and temperatures out of mixtures of graphite and catalyst metal (Ni, Fe, etc.) to which small amounts of B, Be, or Al have been added. The crystals may have resistivities of as low as 103 ohm-cm with activation energies for conduction ranging between 0.1 a…