Mullite and mullite ceramics
Crystal Chemistry of Mullite Phase Equilibria of Mullite Mullite Synthesis Mullite Processing Properties of Mullite Ceramics Industrial Use of Mullite.
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High mobility n-type charge carriers in large single crystals of anatase (TiO2)
Resistivity, thermopower, and Hall-effect measurements on large single crystals of the anatase form of TiO2 all indicate high mobility n-type carriers that are produced by thermal excitation from a density of ∼1018 cm−3 putatively present shallow donor states. The decrease of the mobility with increasing temperature i…
Critical Appraisal of Limiting Strain Rates for Compression Testing of Ceramics in a Split Hopkinson Pressure Bar
The split Hopkinson pressure bar (SHPB) is being widely used to determine the dynamic compressive strength of ceramics and ceramic composites. However, extreme caution needs to be exercised while testing these highstrength ceramics at high strain rates. The highest strain rate at which ceramics can be tested using an…
Preparation, characterization, and photophysics of the quantum dot quantum well system cadmium sulfide/mercury sulfide/cadmium sulfide
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, characterization, and photophysics of the quantum dot quantum well system cadmium sulfide/mercury sulfide/cadmium sulfideA. Mews, A. Eychmueller, M. Giersig, D. Schooss, and H. WellerCite this: J. Phys. Chem. 1994, 98, 3, 934–941Publication Date (Print):January…
Measurements and calculations of the hyperpolarizabilities of atoms and small molecules in the gas phase
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMeasurements and calculations of the hyperpolarizabilities of atoms and small molecules in the gas phaseDavid P. Shelton and Julia E. RiceCite this: Chem. Rev. 1994, 94, 1, 3–29Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published in…
Effect of Dopants on Zirconia Stabilization—An X‐ray Absorption Study: I, Trivalent Dopants
Local atomic structures of Zr and dopant cations in zirconia solid solutions with Fe 2 O 3 , Ga 2 O 3 , Y 2 O 3 , and Gd 2 O 3 have been determined. The Zr ions in both partially stabilized tetragonal and fully stabilized cubic zirconia have their own characteristic structures which are dopant‐independent. The dopant…
Direct evaluation of domain-wall and intrinsic contributions to the dielectric and piezoelectric response and their temperature dependence on lead zirconate-titanate ceramics
By making use of the fact that domain-wall motions do not produce volumetric changes, an experimental method is introduced to directly and quantitatively determine the domain-wall and intrinsic contributions to the piezoelectric and dielectric responses of a ferroelectric material. Utilizing this method, the contribut…
Antiferroelectric chiral smectic liquid crystals
In a brief history of the discovery of antiferroelectricity in liquid crystals, the important role played by tristable switching, i.e. an electric field induced phase transition from antiferroelectric SCA* to ferroelectric SC*, has been emphasised and the antiferroelectric herringbone structure of SCA* has been presen…
Metalloporphyrins in catalytic oxidations
Oxidation Catalysis by Metalloporphyrins - A Historical Perspective The Mechanisms of Reaction of Hypervalent Oxochromium, Iron and Manganese Tetraphenylporphyrins with Alkenes Theoretical Studies of Oxometalloporphyrins and Their Reactions with Organic Substrates Cytochrome P450 Model Systems Heme Proteins in Prostag…
"N-Confused Porphyrin": A New Isomer of Tetraphenylporphyrin
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT"N-Confused Porphyrin": A New Isomer of TetraphenylporphyrinHiroyuki Furuta, Tsutomu Asano, and Takuji OgawaCite this: J. Am. Chem. Soc. 1994, 116, 2, 767–768Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 199…
Dendrimer‐based metal chelates: A new class of magnetic resonance imaging contrast agents
We have developed a new class of magnetic resonance imaging contrast agents with large proton relaxation enhancements and high molecular relaxivities. The reagents are built from the polyamidoamine form of Starburst dendrimers in which free amines have been conjugated to the chelator 2-(4-isothiocyanatobenzyl)-6-methy…
Crystal engineering of diamondoid networks
M. J. Zaworotko, Chem. Soc. Rev., 1994, 23, 283 DOI: 10.1039/CS9942300283
Synthesis of an ultralarge pore titanium silicate isomorphous to MCM-41 and its application as a catalyst for selective oxidation of hydrocarbons
An ultralarge pore titanium silicate with MCM-41 structure has been prepared by direct hydrothermal synthesis; this material gives rise to useful catalysts for the selective oxidation of small and large organic compounds.
An improved computational constitutive model for brittle materials
An improved computational constitutive model for brittle materials is presented. It is applicable for brittle materials subjected to large strains, high strain rates and high pressures, and is well‐suited for computations in both Lagrangian and Eulerian codes. The equivalent strength is dependent on the intact strengt…
Eight Histidine Residues Are Catalytically Essential in a Membrane-Associated Iron Enzyme, Stearoyl-CoA Desaturase, and Are Conserved in Alkane Hydroxylase and Xylene Monooxygenase
The eukaryotic fatty acid desaturases are iron-containing enzymes that catalyze the NAD-(P)H- and O2-dependent introduction of double bonds into methylene-interrupted fatty acyl chains. Examination of deduced amino acid sequences for the membrane desaturases from mammals, fungi, insects, higher plants, and cyanobacter…
Magnesium alloys and applications
The methods for producing magnesium are briefly described and its alloying behaviour is discussed with particular reference to the roles of individual alloying elements. Cast and wrought alloys are considered separately and particular attention is paid to microstructure–property relationships and corrosion behaviour.…
Design of hybrid organic-inorganic materials synthesized via sol-gel chemistry
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Interface and surface effects on the glass-transition temperature in thin polymer films
We have measured the thickness dependence of the glass-transition temperature (Tg) of thin films of poly(methyl methacrylate)(PMMA) by using spectroscopic ellipsometry to detect the discontinuity in thermal expansivity occurring at Tg. We studied films on two surfaces: the native oxide of silicon, and evaporated gold.…
Relaxorferroelectrics: An overview
The paper will trace the evolution of understanding related to the modification of sharp ferroelectric phase transition behavior that occurs in composition systems which exhibit diffuse and relaxor ferroelectric properties. The focus will be primarily upon the perovskite structure families where cations of different v…
Third-Order Nonlinear Optical Response in Organic Materials: Theoretical and Experimental Aspects
ADVERTISEMENT RETURN TO ISSUEPREVArticleThird-Order Nonlinear Optical Response in Organic Materials: Theoretical and Experimental AspectsJ. L. Bredas, C. Adant, P. Tackx, A. Persoons, and B. M. PierceCite this: Chem. Rev. 1994, 94, 1, 243–278Publication Date (Print):January 1, 1994Publication History Published online1…