Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of large but defective deltahedra in the structural chemistry of very complex solid borides and gallidesJeremy K. Burdett and Enric CanadellCite this: Inorg. Chem. 1991, 30, 9, 1991–1998Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Pu…
Reversible phase transformations with volume contractions were found at 18 GPa and 22 GPa when graphite was compressed at room temperature. Volume contraction was detected in a diamond anvil cell by observing a plateau in the curve of generated pressure versus the cell load. The phase realized at 18 GPa is thought to…
Reactive sputter deposition was used to grow a phase-separated 0.40 Au/0.56 Au2O3/0.04 Au-hydroxide cermet film and x-ray photoelectron spectroscopy was used to examine the Au 4f and O 1s core electron binding energy of each phase. The valence band structure of Au2O3 is reported here for the first time, and consists o…
Abstract 2‐Ethyl‐2‐hydroxymethyltrimethylene carbonate (5‐ethyl‐5‐hydroxymethyl‐1,3‐dioxan‐2‐one) ( 1 ) was treated with trimethylsilyl chloride, benzyl chloroformate and phenyl isocyanate to give the corresponding 5,5‐disubstituted 1,3‐dioxan‐2‐ones 2 , 3 and 4 . These monomers were subjected to anionic ring‐opening…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of a bridging dicarboxylate ligand on the synthesis and physical properties of (.mu.-oxo)bis(.mu.-carboxylato)diiron(III) complexesRobert H. Beer, William B. Tolman, Simon G. Bott, and Stephen J. LippardCite this: Inorg. Chem. 1991, 30, 9, 2082–2092Publication Date (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric relaxation studies of poly(4-hydroxybenzoic acid) and copolyesters based on 4-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acidDouglass S. Kalika and Do Y. YoonCite this: Macromolecules 1991, 24, 11, 3404–3412Publication Date (Print):May 1, 1991Publication Histor…
Calculations are reported of the dynamic second hyperpolarizabilities (\ensuremath{\gamma}) of ${\mathrm{H}}_{2}$ and ${\mathrm{D}}_{2}$ which are relevant to three different nonlinear optical processes. They have been carried out using an expanded basis set for the \ensuremath{\Delta} states that occur in the sum-ove…
Losses were measured as a function of magnetization frequency f/sub d/ for two advanced soft magnetic alloys: laser-scribed 0.23-mm HI-B steel ZDKH (designated HB) and consolidated amorphous Powercore (designated PC). Although domain observations on HB yielded distinct domain refinements due to the laser treatment, an…
Perovskite oxides , [ and , ] containing A site defects were studied by thermal analysis, measuring of the temperature dependence of electrical conductivity (373–1273 K) and x‐ray diffraction. The results showed that underwent a phase transition accompanied by oxygen desorption at about 1000 K in air. The electrical c…
The synthesis of new zirconium and hafnium bisporphyrinate double deckers M(P) 2 (MZr, Hf; POEP, TPP) 2,3) is described. The complexes are characterized by UV/Vis/NIR and 1 H‐NMR spectroscopy and cyclic voltammetry. As compared with MCe, the redox potentials or the energies of the nearinfrared absorption bands of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(carbosilane) precursors of silicon carbide: the effect of cross-linking on ceramic residueBruno Boury, Robert J. P. Corriu, and William E. DouglasCite this: Chem. Mater. 1991, 3, 3, 487–489Publication Date (Print):May 1, 1991Publication History Published online1 May 200…
Single crystals of the reduced niobate Ba2Nb15O32 are produced by heating NbO2 in BaO·3B2O3 under high-vacuum conditions. The borate acts both as a source of BaO and as a flux for crystallization. The compound Ba2Nb15O32 crystallizes in space group R3 (a = 7.777 (1) Å, c = 35.518 (6) Å) and contains isolated [Nb6O12]O…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSegregation of low molecular weight symmetric diblock copolymers at the interface of high molecular weight homopolymersPeter F. Green and Thomas P. RussellCite this: Macromolecules 1991, 24, 10, 2931–2935Publication Date (Print):May 1, 1991Publication History Published onlin…
Two distinct types of fumarase were purified to homogeneity from aerobically grown Escherichia coli W cells. The amino acid sequences of their NH2-terminals suggest that the two enzymes are the products of the fumA gene (FUMA) and fumC gene (FUMC), respectively. FUMA was separated from FUMC by chromatography on a Q-Se…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBenzoannelated centropolyquinanes. Part IX. Synthesis and conformational behavior of fenestrindans (tetrabenzo[5.5.5.5]fenestranes) with four bridgehead substituentsDietmar Kuck, Andreas Schuster, and Ralph A. KrauseCite this: J. Org. Chem. 1991, 56, 11, 3472–3475Publication…
The preparation of several amorphous calcium aluminate compositions by the sol‐gel procedure is reported. Although a broad composition range of amorphous gels could be prepared, they invariably crystallized when heated to sufficiently high temperatures. The crystallization behavior of bulk samples and thin gel films o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of needlelike crystals (whiskers) of poly(6-hydroxy-2-naphthoic acid)G. Schwarz and Hans R. KricheldorfCite this: Macromolecules 1991, 24, 10, 2829–2833Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissu…
The slip systems and plastic properties of normal and transition hexagonal metals are briefly reviewed. In the case of titanium, there is strong evidence that the core of screw dislocations has a sessile three-dimensional configuration, so that the lattice friction on screw dislocations governs the low-temperature pla…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric relaxation behavior of styrene-isoprene diblock copolymers: bulk systemsMing Long Yao, Hiroshi Watanabe, Keiichiro Adachi, and Tadao KotakaCite this: Macromolecules 1991, 24, 10, 2955–2962Publication Date (Print):May 1, 1991Publication History Published online1 Ma…
Abstract The objective of this paper is to develop the analytical background for test methodologies that will enable accurate prediction of the strength distribution of ceramic tubular components from the strength distributions of simple specimens. Four simple specimen configurations and two tubular configurations wer…