Materials Literature
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Tetragonal La-modified lead zirconate titanate ceramics with a Zr/Ti ratio of 40/60 (x/40/60) with La contents (x) between 0 and 21 at. % were prepared by the mixed oxide method and were subsequently characterized using dielectric spectroscopy. Small La contents tended to diffuse the dielectric response in the tempera…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen-17 NMR study of water exchange on gadolinium polyaminopolyacetates [Gd(DTPA)(H2O)]2- and [Gd(DOTA)(H2O)]- related to NMR imagingKaroly Micskei, Lothar Helm, Erno Brucher, and Andre E. MerbachCite this: Inorg. Chem. 1993, 32, 18, 3844–3850Publication Date (Print):Septe…
The unthreading and rethreading of pseudorotaxane 1, which contains two p-phenylene spacers linking two bipyridinium units and a central 1, 5-naphthalenediyl unit, is reversible when an initially oxygen-free solution of 1 in water also containing 9-anthracenecarboxylic acid as a photosensitizes and triethanolamine as…
Structural ceramics for high‐temperature applications should embody the following properties: oxidation resistance, chemical stability, low volatility, resistance to creep deformation, resistance to creep cavitation at interfaces, sufficient toughness at ambient temperature, and thermalshock resistance. These criteria…
SUMMARY The ability of roots to weather phlogopite as shown by the release of interlayer‐K and by the concomitant vermiculitization of the mica was investigated in the rhizosphere of Italian ryegrass ( Lolium multiflorum ), grown for 1 to 32 d on 2–105 μm mica as sole source of both K and Mg. The K‐balance showed that…
This article is based on the lecture, by Dr. María Isabel Sánchez de Rojas (Senior Researcher at the Eduardo Torroja Institute) and it is entitled "European Cement Standars" which was given in the framework of SEMINARIOS TORROJA, Building Technology and Materials.
This paper presents the mechanical behaviour of a compacted composite formed by short ductile copper fibres randomly distributed in portland cement matrix. The samples, a half with fibres and the other without them, were subjected to compression fatigue. So, 1 hertz and the value of stress corresponding to the 1% of t…