Materials Literature
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In the i.r. emission of ZnS:Cr crystals, a zero-phonon doublet at 5211 and 5216 cm -1 and a number of vibronie bands are resolved at T ≈ 4 K. The T d symmetry of the crystal field at the Cr 2+ ion on a Zn lattice site is reduced to D 2d by a static Jahn-Teller effect. Differences in the vibronie structures of absorpti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopy of azaporphyrinsYoshio. Niwa, Hiroshi. Kobayashi, and Toshikazu. TsuchiyaCite this: Inorg. Chem. 1974, 13, 12, 2891–2896Publication Date (Print):December 1, 1974Publication History Published online1 May 2002Published inissue 1 December 1974ht…
The oxides of Mn and Fe or combinations of La 2 O 3 with these oxides were incorporated into PbTiO 3 under defined thermodynamic conditions. The substitution reaction of these additives was examined gravimetrically. At low partial pressures of O 2 and PbO vapor, Mn 2+ and Fe 2+ are formed at the A sites, and Mn 3+ and…
A single-crystal diffractometer has been constructed for use with γ-radiation of wavelengths down to λ = 0.03 Å. The relative line width at room temperature of the 412 keV line of radioactive gold is Δλ/λ = 10−6. The angular divergence of the primary beam in the scattering plane is equal to 10′′. The wavelength is so…
The construction and successful operation of a Laue-case skew-symmetric two-crystal X-ray interferometer is described. The alignment is accomplished with an auxiliary X-ray beam, which is multiply reflected by both interferometer parts. As expected, the skew-symmetric two-crystal interferometer is found to be consider…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of the dielectric behavior of several Schiff-base and phenyl benzoate liquid crystalsR. T. Klingbiel, D. J. Genova, T. R. Criswell, and J. P. Van MeterCite this: J. Am. Chem. Soc. 1974, 96, 25, 7651–7655Publication Date (Print):December 1, 1974Publication History…
Spectroscopic measurements are reported on single crystals of the high-${\mathrm{Nd}}^{3+}$-concentration perovskite ${\mathrm{Cs}}_{2}$NaNd${\mathrm{Cl}}_{6}$ [$\ensuremath{\rho}(\mathrm{Nd})=3.2\ifmmode\times\else\texttimes\fi{}{10}^{21}$ ${\mathrm{cm}}^{\ensuremath{-}3}$] and on ${\mathrm{Cs}}_{2}$Na${\mathrm{Nd}}_…
Abstract The ESR and visible absorption spectra of a number of bis(N-salicylidenealkylaminato)copper(II) complexes with different kinds of alkyl groups were measured in toluene. The coordinations of these complexes in toluene are distorted towards a tetrahedral geometry to varying extents; the relationship between the…
Polarized-neutron diffuse-scattering measurements were made on Ni-rich NiMn alloys to determine the distribution of magnetic moments in this system. At 5-at.% Mn, the individual moments are (3.50 \ifmmode\pm\else\textpm\fi{} 0.13)${\mathrm{\ensuremath{\mu}}}_{\mathit{B}}$/Mn and (0.584 \ifmmode\pm\else\textpm\fi{} 0.0…
Abstract Synthetic kaolinites of varying crystallinity, and in some instances with ideal morphology, have been produced by hydrothermal reaction of aluminiosilicate gels. Synthetic kaolinites doped with Mg 2+ and Fe 3+ were also obtained. Synthetic kaolinite doped with Fe 3+ produced an ESR spectrum at g = 4 identical…
The three polypeptide chains of a precursor of collagen, procollagen, were found to join their NH,-terminal regions in disulfide linkage independently of the state of folding of the remainder of the polypeptide chains.This folding becomes altered from random coil to collagen helix by secondary modification, hydroxylat…
Abstract Dissolution data on five of the six illites reported by Reesman and Keller (1968) indicate that these illites are more stable than was previously thought. The revised Gibbs free energies of formation (Δ G f 0 ) with respect to the ‘ideal’ illite formula and the muscovite formula are Use of muscovite formula a…
SUMMARY The different kinds of crystalline interfaces can be classified by means of the O‐lattice method. Two groups of parameters have to be known for the description of an interface. The first group concerns the structures and the relative orientation of the adjoining crystals and the second group deals with the pos…
The Ho-Fe and Ho-Ho interaction parameters are discussed in reference to optical Zeeman spectroscopic data and magnetization data on HoFe${\mathrm{O}}_{3}$. A molecular-field model is presented that incorporates these parameters in a systematic manner permitting accurate calculations of the ground-state pair Zeeman sp…
An empirical corresponding states relationship between the ratio of the heat capacities Cp/Cv of polymers and the reduced temperature T/Tg has been found. This relationship is discussed in terms of corresponding states behavior. This relationship is significant and useful in that the ratio Cp/Cv is a fundamental quant…
Crystallographic shear appears to be a defect-controlled type of process for the formation of the oxides in the homologous series such as TiO2-x, WO3-x out of their respective stoichiometric phases TiO2 and WO3. After an introductory chapter on the relation between non-stoichiometry and shear structures, giving a geom…
Abstract The solution spectra of two tris(dipyrromethenato)manganese(III) complexes and of one bis(dipyrromethenato) manganese (II) as well as the diffuse reflectance spectrum for the latter were examined. The high spin state was confirmed for all the manganese complexes by magnetic susceptibility measurements. For th…
Abstract Absorption and emission spectra as well as emission quantum yields and lifetimes of 5,10‐dimethylphenazine (DMP), 5‐methyl‐10‐phenylphenazine, and 5,10‐diphenylphenazine were measured in 3‐methylpentane at room temperature and 77°K. By means of relative polarization measurements in conjunction with CNDO/2‐CI…
Abstract Poly(ethylene terephthalate) was separated into 12 fractions of equal size by a stepwise increase in the amount of solvent in the two‐phase liquid fractionation system of phenol‐tetrachloroethane (PTCE) (1:1) and n ‐heptane. Various molecular weight parameters of the fractions were measured by osmotic pressur…
Abstract The dc conductivity of hydrated bovine Achilles' tendon collagen has been determined as a function of hydration over a limited temperature range. At ambient temperature the conductivity changes from 10 −15 (Ω cm) −1 in the dry state to about 10 −8 (Ω cm) −1 at ∼24% water content by weight. For all temperature…