Materials Literature
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Based on thermodynamic principles a theory for equilibrium interfacial segregation is proposed for perovskite materials, and this theory is applied to BaTiO 3 . An approach developed by Frenkel and refined by Kliewer and Koehler is extended to undoped ternary oxide materials such as BaTiO 3 . The approach uses regular…
Abstract The influence of composition on phase size in immiscible polymer blends is examined both experimentally and theoretically. It was found for eight noncompatibilized blends, of widely varying particle size morphology, that a master curve of phase size versus log‐relative composition could be obtained by shiftin…
A number of Pseudomonas species have been identified which accumulate a polyhydroxyalkanoate containing mainly 3-hydroxydecanoate monomers from sodium gluconate as the sole carbon source. One of these, Pseudomonas sp. strain NCIMB 40135, was further investigated and shown to accumulate such a polyhydroxyalkanoate from…
Experiments simulating carbonate diagenesis have been performed using natural oolitic and skeletal sediments in seawater at temperatures of 183-186 °C and hydrostatic pressures of 6-10 MPa. During the experiments both equant and granular/columnar calcite cements were precipitated. Equant cements developed when both nu…
Uranium dioxide fuels irradiated in a commercial BWR during 1 to 4 cycles (burn-up: 6–28 GWd/t) have been annealed in an out-of-pile condition and the release rate of 85Kr was measured continuously. The annealing temperature ranged 1,500–1,800°C. The effects of temperature and burn-up have been studied on burst releas…
This article reviews children's ideas about radiation and radioactivity and identifies several common areas of misunderstanding. A new approach to teaching the topic at school level, which seeks specifically to address these known difficulties, is then proposed and outlined.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTristrontium dialuminum hexaoxide: an intricate superstructure of perovskiteJ. A. Alonso, I. Rasines, and J. L. SoubeyrouxCite this: Inorg. Chem. 1990, 29, 23, 4768–4771Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1…
A proposed model for interfacial segregation in perovskites, with induced heterogeneous defect distributions, is extended here to account for the formation of internal boundary layer devices, such as positive temperature coefficient of resistance (PTCR) thermistors and internal boundary layer capacitors (IBLC). Bounda…
We study a triangular network containing two kinds of Hooke springs with different natural lengths. If the two spring constants are the same, we can solve the model exactly and show that Vegard's law is obeyed, irrespective of whether the bonds are arranged randomly or in a correlated way. A more complete description…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReevaluation of the surface tension components and parameters of polyacetylene from contact angles of liquidsC. J. Van Oss, R. F. Giese Jr., and R. J. GoodCite this: Langmuir 1990, 6, 11, 1711–1713Publication Date (Print):November 1, 1990Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA comparison of relaxation time distributions obtained from dynamic light scattering and dynamic mechanical measurements for high-molecular-weight polystyrene in entangled solutionsTaco Nicolai, Wyn Brown, Soeren Hvidt, and Kurt HellerCite this: Macromolecules 1990, 23, 24,…
The evolution of the cold deformation microstructure is described for medium to high stacking fault energy, single phase fcc metals. Macroscopic strain accommodation for polycrystalline metals is considered, and it is suggested that grains subdivide during deformation on a smaller and smaller scale, and that each volu…
The phenomenon of electromechanical failure of zirconia has been examined. It is shown that spatial variation of electronic conductivity in a predominantly oxygen ion conductor can lead to internal precipitation of molecular oxygen and its pressurization. Internal pressures high enough to crack zirconia can develop if…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSequence-regulated oligomers and polymers by living cationic polymerization. 2. Principle of sequence regulation and synthesis of sequence-regulated oligomers of functional vinyl ethers and styrene derivativesMasahiko Minoda, Mitsuo Sawamoto, and Toshinobu HigashimuraCite th…
Microwave-induced changes in the optical emission of the N-V center in diamond have previously been attributed to magnetic resonance of the defect in its $^{3}$A ground state [E. van Oort et al., J. Phys. C 21, 4385 (1988)]. In this paper, the focus is on the origin of the hyperfine splittings that are observed in the…
The synthesis and characterization of polysaccharides esterified with gadolinium diethylenetriaminepentaacetic acid (GdDTPA) are described. The results of several synthetic methods are presented for esterification of dextrans and inulin with DTPA. One method results in highly conjugated products labeled with an averag…
Microdesigned interfacial pore structures were used to study pore drag and pore‐boundary separation in Al 2 O 3 . This approach allows the creation of pore arrays containing pores of controlled size and spacing at well‐defined singlecrystal seed/polycrystalline matrix interfaces, and enables experimental determination…
Texture development during the thermomechanical processing of high strength aluminium alloys is reviewed. The alloys dealt with include both conventional heat treatable alloys, and unconventional materials such as rapidly quenched alloys and metal-matrix composites. The processing routes considered include hot and col…
The processes and mechanisms controlling grain growth in crystalline solids are reviewed. The driving forces governing the overall process are considered, and a distinction is made between normal and anomalous grain growth. The influence of solutes and dispersions (soluble and insoluble, coherent and incoherent) is di…
Abstract Monazite structure‐type solid solutions of cerium and terbium orthophosphates Ce 1− x Tb x PO 4 , with 0 < x < 1, were prepared by coprecipitation followed by calcination at 800°C for 2 h. They were used as catalysts for the oxidative dehydrogenation of ethylbenzene. The compounds Ce 0.9 Tb 0.1 PO 4 and…