Materials Literature
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The dielectric properties and chemical homogeneity of BaTiO 3 ceramics sintered with additions of the pseudophase “CdBi 2 Nb 2 O 9 ” were investigated using SEM, TEM, STEM, and EDX. In materials showing the “X7R” dielectric temperature characteristic, the microstructure exhibits the grain core‐grain shell structure. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic properties of star-shaped polymersDale S. Pearson and Eugene HelfandCite this: Macromolecules 1984, 17, 4, 888–895Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published inissue 1 April 1984https://doi.org/10.1021/ma00134a06…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRegime III crystallization in polypropyleneElizabeth J. Clark and John D. HoffmanCite this: Macromolecules 1984, 17, 4, 878–885Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published inissue 1 April 1984https://pubs.acs.org/doi/10.1021/m…
Abstract Olique-texture electron diffraction examination of K-saturated dioctahedral smectites after 70–100 wetting-drying cycles allows the determination of cation distribution between trans and cis octahedra of the 2:1 layers. Studies of smectites with different compositions has revealed a wide variety of occupancie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure, magnetic properties, ESR, and optical spectra for 2-iron ferredoxin models by LCAO-X.alpha. valence bond theoryLouis Noodleman and Evert Jan BaerendsCite this: J. Am. Chem. Soc. 1984, 106, 8, 2316–2327Publication Date (Print):April 1, 1984Publication Hi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-state high-resolution silicon-29 chemical shifts in silicatesM. Magi, E. Lippmaa, A. Samoson, G. Engelhardt, and A. R. GrimmerCite this: J. Phys. Chem. 1984, 88, 8, 1518–1522Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published i…
Determination of the crystal structure of ${\mathrm{Nd}}_{2}$${\mathrm{Fe}}_{14}$B, a new ternary phase, is reported. It has recently been demonstrated that permanent magnets having large coercivities and energy products can be formed from this phase, underscoring its potential technological importance. We relate the…
Data are presented on the EPR spectra of transition metal and Group IV metal complexes with o-semiquinone ligands. Analysis of the g-factors and the hyperfine coupling constants has been used to determine the structure of the complexes, the electronic configuration of the metal, and the ligand substitution processes.…
The use of dilute polymer solutions for molecular weight measurements requires the macromolecules to be in a true solution, i.e., dispersed on a molecular level. This state may not be realized in certain instances because stable, multimolecular aggregates may persist under the conditions of "solution" preparation. In…
In conventional x-ray diffraction experiments on single crystals, essentially monochromatic x-rays are used. If polychromatic x-rays derived from a synchrotron radiation spectrum are used, they generate a Laue diffraction pattern. Laue patterns from single crystals of macromolecules can be obtained in less-than 1 seco…
Phosphoprotein particles were isolated in their native state from the physiological fluid of the estuarine clam Rangia cuneata , and the characteristics of the mineral ion-protein complex which constitutes the native particle were investigated by using mineral ion binding and mineral ion exchange techniques. The parti…
Zero-field optically detected magnetic resonance (ZF-ODMR) is reported for the first time in semiconductors. The results of zero-field triplet magnetic resonances for the 1.91 eV emission in GaP:Cu are reported and compared with previous ODMR measurements. The potential of the technique for both crystalline and amorph…
The variation of birefringence in AlPO 4 is investigated between 300 and 90K. In the alpha phase it can be fitted very well with a classical law for first-order phase transitions. In qualitative agreement with previous c p measurements the possibility of intermediate states between the alpha and beta phases is derived…
Four zero-phonon lines of defect centres in diamond (GR1 (741 nm), N-V (637 nm), H4 (496 nm) and N3 (415 nm)) have been shown to exhibit persistent spectral hole burning. The phenomenon appears to be a rather general one in diamond and should prove very powerful for elucidation of the nature of defect centres. As an e…
This paper presents the results of experimental measurements and a mean-field-theory analysis of the behavior of the average tilt angle near the smectic-${C}^{*}$ to smectic-$A$ transition in thin films of two through ten molecular layers. These films provide one of the few physical realizations of systems where the s…
Brillouin scattering spectra in water both in the normal and in the metastable (supercooled) regions are investigated. The experimenal data are extended for the first time in a bulk sample down to -27.0\ifmmode^\circ\else\textdegree\fi{}C. A refined analysis method allows the authors to obtain hypersonic absorption an…
Equilibrium crystals of Pb in the temperature range 200- 300\ifmmode^\circ\else\textdegree\fi{}C exhibit facets and curved surfaces which are joined at "smooth" edges (no slope discontinuity). Recent theoretical interpretation has suggested that the crystal shape near such edges should show interfacial critical anomal…
EPR investigations of the cr3+ ion in trigonal double molybdate RbIn(MoO4)2 are reported. The spin Hamiltonian parameters of the Cr3+ complexes are: g∥ = 1.9640, g| = 1.9680, |D| = = 0.5400 cm−1 at room temperature. Two structural phase transitions are observed by changes in the EPR spectra of the Cr3+ ion. The spin H…
After application of a uniaxial stress to a frame of monocrystalline MnZn ferrite, the stress dependence of the permeability was measured. In addition the disaccommodation was measured and analyzed in detail. All results were satisfactorily explained by means of a simplified theoretical model. A high imaginary compone…
First studies of the magnetic susceptibility χ in nonstoichiometric FezO samples, free from any ferromagnetic-type impurities, are reported. These polycrystalline samples for z=0.929, 0.938, and 0.950 were prepared by rapid quenching to 77 from 1100 K and characterized for ferromagnetic impurities by χ studies at room…