Materials Literature
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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…
Carbonatite complexes are the principal source of mineable niobium, mainly as pyrochlore, yet no explanations exist for the considerable variations in niobium content between various carbonatites, and little is known about the solubility of Nb in carbonatite magmas or the factors that control pyrochlore crystallizatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-state cadmium-113 NMR studies on cadmium complexes with glycine, L-alanine, and L-cysteinePatrick J. Barrie, Angeli Gyani, Majid Motevalli, and Paul O'BrienCite this: Inorg. Chem. 1993, 32, 18, 3862–3867Publication Date (Print):September 1, 1993Publication History Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, substitution, and atom-transfer reactions of (.eta.2-alkyne)(tetratolylporphyrinato)titanium(II). X-ray structure of trans-bis(4-picoline)(tetratolylporphyrinato)titanium(II)L. Keith Woo, J. Alan Hays, Victor G. Young Jr., Catherine L. Day, Cecil…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of wholly aromatic polyketones using 2,2'-dimethoxybiphenyl as the acyl-acceptant monomerNoriyuki Yonezawa, Shiro Miyata, Toshiaki Nakamura, Shinichiro Mori, Yuriko Ueha, and Ryoichi KatakaiCite this: Macromolecules 1993, 26, 19, 5262–5263Publication Date (Print):S…
A kinetic study of oligoguanylate synthesis on a polycytidylate template, poly(C), as a function of the concentration of the activated monomer, guanosine 5'-monophosphate 2-methylimidazolide, 2-MeImpG, is reported. Reactions were run with 0.005-0.045 M 2-MeImpG in the presence of 0.05 M poly(C) at 23 degrees C. The ki…