Materials Literature
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Photoluminescence and thermoluminescence in BaSO4:Eu is reported. In earlier works, divalent Eu has been studied in BaSO4. In the present work Eu was incorporated as in predominantly Eu3+ or Eu2+ form. It is shown that RE3+ ↔ RE2+ conversion or RE2+ ↔ RE+ conversion is not an integral part of gamma induced TL. Eu3+ ↔…
Resin bonded magnets are prepared from Sm/sub 2/Fe/sub 17/N/sub x/ compounds and their magnetic properties and stabilities are investigated. The magnetic properties of the Sm/sub 2/Fe/sub 17/N/sub 3/ fine powder are: B/sub r/=13.4 kG, H/sub ci/=8.6 kOe, and (BH)/sub max/=30.3 MGOe. The bonded magnets show (BH)/sub max…
We propose a mechanism for the long range interaction needed to explain the occurance of a “Devil's staircase” in smectic C* materials at the ferroelectric antiferroelectric transition point.
The optical transmittance of pressureless sintered and of hot isostatically pressed (HIPed) mullite ceramics was studied in the near infrared (NIR), visible light (VIS), and the ultraviolet (UV) spectrum ranges. Both processing methods provided fine‐grained microstructures (mean grain size of 5–10 μm) with equiaxed gr…
A vibratory-type cavitation test rig was constructed to study the effect of polarizing currents applied to a cavitating body. The generation of gas by electrolysis reduced mechanical damage suffered by a cavitating body because of bubble collapse cushioning. However, the net effect on overall damage depended on severa…
Abstract The title complexes, [Yb2(obPc)3] (1) and [Dy2(obPc)3] (2) (H2obPc = 2,3,9,10,16,17,23,24-octabutoxyphthalocyanine), were prepared. Their absorption spectra in CH2Cl2 and in benzene and cyclic voltammograms in CH2Cl2 were measured. The electromism of the CH2Cl2 solutions of 1 and 2 was observed in oxidation.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new hydrotalcite-like compound containing vanadium(3+) ions in the layersVicente Rives, Francisco M. Labajos, Maria A. Ulibarri, and Pilar MaletCite this: Inorg. Chem. 1993, 32, 23, 5000–5001Publication Date (Print):November 1, 1993Publication History Published online1 May…
Abstract Infrared reflectance and Raman spectra of LBO crystals were recorded at room temperature and liquid nitrogen temperature. The vibrational modes are classified by the factor group analysis method and the spectral bands are assigned to vibrations of the (B 3 O 6 ) 3− ring and BO 4 tetrahedra.
Stress corrosion cracking of type 304 and type 316 austenitic stainless steels has been investigated as a function of chloride ion concentration in 0.82 kmol m−3 pure sulfuric acid solution at 353 K under a constant stress of 392 MPa by using a constant load method. At a concentration of up to approximately 2 × 10−2 k…
The evolution of x-ray photoelectron and ultraviolet spectra and their modification at the phase transformation B2-B19(B19') of equiatomic TiM and quasibinary Ti(Ni,M) compounds, where M stands for Fe, Co, Ni, Pd, Pt, Au, and Cu, are presented. Investigation of x-ray photoemission spectroscopy includes valence bands,…
Transparent glass‐ceramics containing ZnAl 2 O 4 :Co 2+ and LiGa 5 O 8 :Co 2+ crystallites have been prepared by heat treatment of glasses in the zinc aluminosilicate and lithium gallate silicate systems, respectively. Crystalline LiGa 5 O 8 was already precipitated in an as‐prepared specimen, while ZnAl 2 O 4 :Co 2+…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-resolution microscopy of PMDA-ODA polyimide single crystalsJaime R. Ojeda and David C. MartinCite this: Macromolecules 1993, 26, 24, 6557–6565Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 November 1993https://…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of an n-self-doped conducting polymerN. Zhang, R. Wu, Q. Li, K. Pakbaz, C. O. Yoon, and F. WudlCite this: Chem. Mater. 1993, 5, 11, 1598–1599Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 No…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolybdenum oxo nitrosyl complexes. 1. Defect Lindqvist compounds of the type [Mo5O13(OR)4(NO)]3- (R = CH3, C2H5). Solid-state interactions with alkali-metal cationsAnna Proust, Pierre Gouzerh, and Francis RobertCite this: Inorg. Chem. 1993, 32, 23, 5291–5298Publication Date…
Development of Typic Haplorthods in a heathland area in Denmark responded over a short period of time (decades) to changes of vegetation. Part of the heath, Hjelm Hede, was left undisturbed and was invaded by trees, mainly oak and a few aspen and conifers. Another part of the heath was planted with Norway and Sitka sp…
The equilibrium atomic structure of the (101) and (301) twin boundaries in rutile (TiO2) has been computed using an ionic shell model and compared with high resolution electron microscopy images of the same boundaries using image simulation. The lowest-energy (101) twin boundary structure is characterized by an in-pla…
A study of the two-dimensional rotational magnetic properties of a steel sheet are discussed. These are measured making use of the vector relation between magnetic field strength H and magnetic flux density B. The results of this study lead to the following main conclusions: the permeability tensor becomes a full matr…
The red-violet, liquid-crystalline dye 1, which shows an extraordinarily broad mesophase, is obtained by twofold [2 + 4] cycloaddition of 3,5-dioxotriazoles to alkyl-substituted perylenes. These soluble compounds allow the use of a perylene pigment as a mesogen for the first time. R = n-CxHx + 1 (x = 5, 12, 18); R′ =…
Errors in partial discharge (PD) location on high voltage dielectric cables caused by both mechanical and electrical phenomena are discussed. The sources of error relevant to PD location include errors in measuring time delays, scatter caused by noise and disturbances, pulse propagation distortion, errors in cable len…
Abstract Reversible oligomerization of distributions of molecules yields distributions of monomers, dimers, trimers, tetramers and higher‐order oligomers. The distributions can be functions of molecular weight, carbon number, or other variables that may be considered continuous. Rate expressions are formulated for the…