Materials Literature
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Thermal recovery of radiation defects and microstructural change in UO2 fuels irradiated under LWR conditions (burnup: 25 and 44 GWd/t) have been studied after annealing at temperature range of 450-1,800°C by X-ray diffractometry and transmission electron microscopy (TEM). The lattice parameter of as-irradiated fuels…
A new solid solution, (Bi 1- x Pb x )(Ni (1- x )/2 Ti (1+ x )/2 )O 3 (BPNT-100 x ) (0.3≤ x ≤0.5), is studied for their dielectric, ferroelectric, piezoelectric and mechanical properties as a new group of piezoelectric ceramics. The crystal phase of the solid solution is a perovskite structure with x ≥0.3. The BPNT-100…
The P1\ifmmode\bar\else\textasciimacron\fi{}-P2/c ferroelastic phase transition in ${\mathrm{Zn}}_{0.75}$${\mathrm{Cu}}_{0.25}$${\mathrm{WO}}_{4}$ has been studied as a function of temperature by infrared spectroscopy. Many of the midinfrared features (associated with ${\mathrm{WO}}_{6}$ octahedral vibrations) do not…
The optical absorption spectra of fine grained polycrystalline thin films of lithium tungsten bronze are reported. The results are similar to the previously reported data for hydrogen and sodium tungsten bronzes: pointing to the secondary importance of the nature of the guest atom. The visible blue color band, peaking…
Brain perfusion SPECT imaging using Tc-99m ethyl cysteinate dimer (ECD) was carried out in 12 patients with chronic cerebrovascular disease. The sensitivity of lesion detection and lesion-to-normal tissue contrast was compared with those of I-123 IMP and Tc-99m HMPAO. Eight patients underwent all three studies and the…
Binary mixtures of two compounds with phase sequences isotropic (I)--chiral-nematic (N)--chiral-smectic-C (${\mathit{C}}^{\mathrm{*}}$) and I--N--smectic-A (A)--${\mathit{C}}^{\mathrm{*}}$ have been investigated. Spontaneous-polarization and tilt-angle measurements near the A-${\mathit{C}}^{\mathrm{*}}$ transition ind…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInternal electric field and second harmonic generation in the blends of vinylidene fluoride-trifluoroethylene copolymer and poly(methyl methacrylate) with a pendant nonlinear optical dyeNaoto Tsutsumi, Tsuyoshi Ono, and Tsuyoshi KiyotsukuriCite this: Macromolecules 1993, 26,…
A metal-metal transition followed by a structural transition near room temperature was found in the solid solutions between cubic ${\mathrm{ZrB}}_{12}$ and tetragonal ${\mathrm{ScB}}_{12}$, i.e., in ${\mathrm{Zr}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sc}}_{\mathit{x}}$${\mathrm{B}}_{12}$ with compositions in…
Two rotational isomers of an ethylene derivative could for the first time be prepared and structurally characterized: the almost planar 1 and the twisted 2, which probably has the largest twist angle (approximately 50°) of all symmetrically substituted ethylenes yet synthesized. The longest wavelength absorption maxim…
The paramagnetic-excitation spectrum of ${\mathrm{TbPO}}_{4}$ has been investigated by means of inelastic neutron-scattering techniques, and the observed crystal-field transitions were analyzed using a Hamiltonian that included the atomic free-ion and crystal-field interactions for an ${\mathit{f}}^{8}$ configuration.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology of poly(styrene-block-butadiene-block-styrene) triblock copolymers crosslinked in the disordered stateShinichi Sakurai, Kazuyoshi Iwane, and Shunji NomuraCite this: Macromolecules 1993, 26, 20, 5479–5486Publication Date (Print):September 1, 1993Publication History…
We report optical-spectroscopic studies of the ground-state splitting of the nominal S-state ion Cm3+ in LaCl3. A total splitting of 1.97±0.05 cm−1 for the 8𝒮7/2 ground state of this system has been measured for the first time. Both electric and magnetic dipole transitions were observed. Energy levels of all four Kram…
The temperaure dependence of the dielectric constant has been studied in the (Ba 1- x Sr x )(Mg 1/3 Ta 2/3 )O 3 solid solution. It is found by transmission electron microscopy and Raman spectroscopy that a new low-temperature phase exists in materials with strontium-rich compositions, and it is transformed into the or…
The Raman spectrum of ${\mathrm{Sn}}_{2}$${\mathrm{P}}_{2}$${\mathrm{Se}}_{6}$ is found to be in good agreement with the selection rules in the paraelectric and ferroelectric phases. The incommensurability has only a minor influence on the phonon scattering in ${\mathrm{Sn}}_{2}$${\mathrm{P}}_{2}$${\mathrm{Se}}_{6}$.…
Abstract The transformation of smectite to illite has been cited by many authors as a source of silica during diagenesis of mudrocks. Illites themselves, however, undergo chemical changes as they recrystallize into micas during high-grade diagenesis/low-grade metamorphism. Average compositions of phyllosilicates from…
(1- x )Pb(Ni 1/3 Nb 2/3 )O 3 - x PbTiO 3 perovskite ceramics were synthesized by using PbO, NiNb 2 O 6 and PbTiO 3 as raw materials. The prepared specimens were dense (RD>95%) and composed of only the perovskite phase. The morphotropic phase boundary between tetragonal and pseudocubic forms in this system existed i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIodine-doped polyazines: evidence against bipolarons and nitrenium ionsDouglas S. Dudis, Alan T. Yeates, Daniel Kost, Douglas A. Smith, and Jorge MedranoCite this: J. Am. Chem. Soc. 1993, 115, 19, 8770–8774Publication Date (Print):September 1, 1993Publication History Publish…
Cytochrome P-450lin catalyzes the 8-methyl hydroxylation of linalool as the first committed step of its utilization by Pseudomonas incognita as the sole carbon source. By using a polymerase chain reaction-based cloning strategy, a 2.1-kb DNA fragment containing the cytochrome P-450lin gene (linC) was isolated. An open…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLocal structure of sodium aluminosilicate glass: an ab initio molecular orbital studyTakashi Uchino, Tetsuo Sakka, Yukio Ogata, and Matae IwasakiCite this: J. Phys. Chem. 1993, 97, 38, 9642–9649Publication Date (Print):September 1, 1993Publication History Published online1 M…
Alloying elements are added to metals to improve workability, electrical properties, and corrosion resistance. Alloying elements also alter the formation, chemical composition, thickness, and tenacity of corrosion products and may increase or decrease susceptibility to microbiologically influenced corrosion (MIC). The…