Materials Literature
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Effects of the concentration of ZrOCl 2 , calcination temperature, heating rate, and the size of secondary particles after hydrolysis on the preparation of high‐purity ZrSiO 4 fine powders from ZrOCl 2 .8H 2 O (0.2 M to 1.7 M ) and equimolar colloidal SiO 2 using sol–gel processing have been studied. Mechanical proper…
Aluminum borate, 9Al 2 O 3 ·2B 2 O 3 or Al 18 B 4 O 33 , was synthesized by the reaction of stoichiometric amounts of α‐Al 2 O 3 and B 2 O 3 . The Al 18 B 4 O 33 material was formed into a dense ceramic by pressureless sintering with CaO, MgO, or CaAl 2 B 2 O 7 additives. The material was characterized by low bulk den…
TiB 2 ‐particle reinforcement is one of the most successful methods for improving the fracture toughness of SiC ceramics. 1–3 Commercially available TiB 2 powders, however, have a large particle size and/or are highly reactive so that they are not favorable as a starting powder. In the present work, TiB 2 particles ar…
Carbothermal reduction kinetics to synthesize boron carbide are studied under conditions of high carbon/boron oxide precursor heating rates (> 10 3 K/s) and intermediate temperatures (1803 K < T < 2123 K). For these conditions, fractional carbon conversion, X, can be described by a nucleation–growth rate expr…
We study the one-dimensional tight-binding model with site energies arranged in the Thue-Morse sequence. To show the characteristics of eigenstates, we study the trace map, wave functions, and the resistance, and perform a multifractal analysis on the wave functions. Half of all the eigenstates are represented by latt…
Aspartate racemase from Streptococcus thermophilus contains no pyridoxal 5'-phosphate or other cofactors such as FAD, NAD+, and metal ions. It was affected by neither carbonyl reagents such as hydroxylamine nor sodium borohydride but was strongly inhibited by iodoacetamide and other thiol reagents. Aspartate, cysteate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTXPS studies on conducting polymers: polypyrrole films doped with perchlorate and polymeric anionsLjiljana Atanasoska, Katsuhiko Naoi, and William H. SmyrlCite this: Chem. Mater. 1992, 4, 5, 988–994Publication Date (Print):September 1, 1992Publication History Published online…
Chromium self-diffusion coefficients in chromia (Cr2O3) single crystals were determined by both ion implantation and thick-film methods, using the 54Cr and 50Cr isotopes. The concentration profiles were established by secondary-ion mass spectrometry, and the diffusion coefficients were computed using a solution of Fic…
The authors present a model for the development of crystallographic texture by hot deformation in NdFeB magnets produced by rapid solidification. Favourably oriented grains, with their c-axis parallel to the compression axis, grow by mass transport through a Nd-rich liquid grain boundary phase, forming large platelet…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel liquid-crystalline polymeric materials via noncovalent "grafting"C. Geraldine Bazuin and Frank A. BrandysCite this: Chem. Mater. 1992, 4, 5, 970–972Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 199…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic properties of amorphous polymers. I. Different temperature dependences of segmental relaxation and terminal dispersionD. J. Plazek, X. D. Zheng, and K. L. NgaiCite this: Macromolecules 1992, 25, 19, 4920–4924Publication Date (Print):September 1, 1992Publication…
Electron channelling contrast is obtained in the scanning electron microscope by detecting back-scattered electrons created by a parallel incident electron beam. The intensity of the back-scattered electrons depends on the orientation of the incident beam with respect to the crystal lattice. In this report, several ex…
Alumina composites containing in‐situ‐formed hexaluminate (LaAl 11 O 18 , LaMgAl 11 O 19 , SrAl 12 O 19 , and Mg 2 NaAl 15 O 25 ) platelets can be pressureless‐sintered to high density. The grain morphology of the aluminates can be controlled by composition. A peak toughness 50% higher than that of alumina is obtained…
The author describes a generalization of the theory of hysteresis to cover asymmetric or minor hysteresis loop excursions. The original description of the model was found to be particularly useful because it enabled hysteresis loops of magnetic materials to be successfully modeled with a limited set of only five physi…
Molecularly designed polymers with narrow polydispersities and well‐defined molecular weights, tailor‐made mesophases, and reactive systems that can be used for further functionalization or cross‐linking reactions are required for applications in areas as diverse as optical data storage, nonlinear optical systems and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImmobilization of algae cells on silica gel and their characterization for trace metal preconcentrationCynthia A. Mahan and James A. HolcombeCite this: Anal. Chem. 1992, 64, 17, 1933–1939Publication Date (Print):September 1, 1992Publication History Published online1 May 2002…
Multilayer poly(p-phenylene biphenyltetracarboximide) (BPDA-PDA) polyimide films of 172 μm total thickness (11.4 μm per layer) were prepared from the poly(amic acid) precursor solution through repetition of a spin-coat/softbake/cure process. Wide-angle x-ray diffraction results indicate that the polyimide molecules in…
This report presents the results obtained by the five U.S. participating laboratories in the Versailles Advanced Materials and Standards (VAMAS) round-robin for fracture toughness of advanced ceramics. Three test methods were used: indentation fracture, indentation strength, and single-edge pre-cracked beam. Two mater…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAbsorption and fluorescence behavior of redispersible cadmium sulfide colloids in various organic solventsU. Resch, A. Eychmueller, M. Haase, and H. WellerCite this: Langmuir 1992, 8, 9, 2215–2218Publication Date (Print):September 1, 1992Publication History Published online1…
Grain growth of ZnO during the liquid‐phase sintering of binary ZnO–Bi 2 O 3 ceramics has been studied for Bi 2 O 3 contents from 3 to 12 wt% and sintering from 900° to 1400°C. The results are considered in combination with previously published studies of ZnO grain growth in the ZnO–Bi 2 O 3 system. For the Bi 2 O 3 c…