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Previous work on Ba2TiGe2O8 crystals has shown an unusual low-temperature (∼ 223 K on cooling, ∼ 273 K on heating) phase transition. Precession x-ray photographs on Ba2TiGe2O8 single crystals show an incommensurate modulation along b*, and, for the first time, also along a*. Single crystal intensity data confirm the a…
The defect structure model in the wustite phase is considered involving the 4:l cluster as a basic defect structure unit. Interactions between defects are considered in terms of the Debye‐Hückel theory for strong electrolytes. It has been shown that the available data on wustite nonstoichiometry fit well the 4:l clust…
TeGeSnAu thin films were studied for phase change type rewritable optical disk material. Addition of Au to TeGeSn thin film shortened crystallization time. The crystallization time of Te 60 Ge 4 Sn 11 Au 25 thin film was about 0.3 µs and was less than one 100th of that of Te 80 Ge 5 Sn 15 thin film. Formation of a sim…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSemiconductor olefin adducts. Photoluminescent properties of cadmium sulfide and cadmium selenide in the presence of butenesGerald J. Meyer, Larry K. Leung, Jim C. Yu, George C. Lisensky, and Arthur B. EllisCite this: J. Am. Chem. Soc. 1989, 111, 14, 5146–5148Publication Dat…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text H. Angus Macleod, "THIN FILM OPTICAL COATINGS," Optics News 15(7), 9-10 (1989) Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save…
This paper is intended to reflect the development of liquid crystal research, rather than to present a detailed historical survey. The author has been involved in this field for some 30 years as a member of the Halle Liquid Crystal Group. There has been a remarkable continuity in liquid-crystal research at the Univers…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of the electronic structures of chromate, halochromates, and chromyl halides by the X.alpha. methodR. M. Miller, D. S. Tinti, and D. A. CaseCite this: Inorg. Chem. 1989, 28, 14, 2738–2743Publication Date (Print):July 1, 1989Publication History Published online1 Ma…
The effect of N 2 ‐gas pressure on the liquid filling of large pores (20 to 120 μm in diameter) is studied in sintered β′‐sialon ( z = 1). The initially sintered sialon with large pores is sintered again and infitrated by a liquid (41A1 2 O 3 ‐41Y 2 O 3 ‐14Si 3 Y 4 ‐4AIN (wt%)) at 17800°C for various times under 0.1‐,…
Abstracts This paper examines the synthesis of a toughened elastomer from Vernonia galamensis seed oil by reacting vernonia oil with vernonia oil‐derived suberic acid (octanedioic acid), and cross‐linking the pre‐polymer in the immediate presence of cross‐linked polystyrene prepared in situ. The paper also demonstrate…
Cross-sectional views of iron ion-implanted gallium arsenide to doses of 4×1014 cm−2 and 1×1015 cm−2 were observed by transmission electron microscopy before and after annealing at 673 K. Microtwins were formed below the surface by implantation of 4×1014 ions cm−2. In the sample implanted to the dose of 1×1015 cm−2 ,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne-electron oxidation of 6-substituted benzo[a]pyrenes by manganic acetate. A model for metabolic activationPaolo Cremonesi, Ercole L. Cavalieri, and Eleanor G. RoganCite this: J. Org. Chem. 1989, 54, 15, 3561–3570Publication Date (Print):July 1, 1989Publication History Pub…
The upper and lower limits of the electrostrictive constants, dielectric permittivities, spontaneous polarizations, and piezoelectric coefficients were calculated for ceramic PbTiO(3) from theoretical single-crystal constants. Experimental ceramic data fall between these upper and lower limits. The large piezoelectric…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of particulate opaque silica gels from highly acidic solutions of tetramethoxysilaneHiromitsu Kozuka and Sumio SakkaCite this: Chem. Mater. 1989, 1, 4, 398–404Publication Date (Print):July 1, 1989Publication History Published online1 May 2002Published inissue 1 Jul…
Oxygen Setf‐diffusion coefficients have been measured in single crystals of N 2 O 3 doped with Mg or Ti under an oxygen partial pressure of 20 kPa in the temperature range 1400° to 1700°C. Diffusion coefficients in Mg‐doped crystals obey the equation D o (cm 2 /s) = 1 × 10 11 ∼ (1×10 13 ) exp[−915 ± 50(kJ/mol)/ RT ].…
We have performed photon correlation spectroscopy experiments to measure the lifetimes of density fluctuations in liquid salol in both the normal and supercooled regimes down to its glass transition at -55 \ifmmode^\circ\else\textdegree\fi{}C. Two modes were found to exist: a temperature-independent, hydrodynamic mode…
Bernard M. Rabin, Walter A. Hunt, James A. Joseph, An Assessment of the Behavioral Toxicity of High-Energy Iron Particles Compared to Other Qualities of Radiation, Radiation Research, Vol. 119, No. 1 (Jul., 1989), pp. 113-122
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvation effect upon glass transition temperature and conductivity of poly(ethylene oxide) complexed with alkali thiocyanatesS. Besner and J. Prud'hommeCite this: Macromolecules 1989, 22, 7, 3029–3037Publication Date (Print):July 1, 1989Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of nitrosyl porphyrins in the temperature range 180-300 K and the effects of pyridine on photodenitrosylation of nitrosyliron tetraphenylporphyrinMikio Hoshino and Mieko KogureCite this: J. Phys. Chem. 1989, 93, 14, 5478–5484Publication Date (Print):July 1, 19…
Abstract Für die Olefine 1 – 8 wurde durch Hydrierwärme‐Messung bzw. Kraftfeld‐Rechnung die Bildungsenthalpie der Grundzustände und durch kinetische Analyse der geometrischen Isomerisierung die der Übergangszustände ermittelt. Die um fast 30 kcal/mol variierenden Rotationsenthalpien lassen sich mit einer einheitlichen…
Dislocation substructures in Y2O3-stabilized ZrO2 single crystals, oriented for single slip on {001}<110> and deformed at 1400[ddot]C, have been studied. The high linear work-hardening rate past microyielding is due to the accumulation of a large number of edge dipoles produced by dragging of jogs on screw dislocation…