Materials Literature
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Abstract Single crystals of the isotypic compounds KMgP 3 O 9 , KZnP 3 O 9 , and KCaP 3 O 9 (benitoite-type) with dimensions up to 35 mm have been grown from the melt. Because of the high viscosity of the melts a special growth method was necessary. The linear electrooptical tensor [ r ijk ] and the tensor of the line…
Abstract The glass transition temperature of the random copolyesters of poly(ethylene terephthalate) and p ‐hydroxybenzoic acid prepared by molten state polycondensation increases with increasing concentration of p ‐oxybenzoate units (oxy‐1,4‐phenylenecarbonyl units). The observed values of the glass transition temper…
Abstract The crystal and molecular structure of pyridine-boron tribromide C5H5N·BBr3 has been determined by an X-ray diffraction method. The unit cell is monoclinic with a=9.396(3) Å, b=15.176(7) Å, c=6.558(2) Å, β=101.85(3)°, and Z=4. The space group is P21/a. Pyridine is bound to boron tribromide via nitrogen atom s…
A study is made of the mechanisms affecting the spectral absorption in anodic copper oxide films. It is shown that the solar absorption is due to the unique surface structure of the anodic oxide film in combination with the optical properties of the basic film component, CuO. The surface structure also affects the spe…
A bstract — Thermal dilatometry has been used to quantify the cristobalite content of natural diatomite calcined in the temperature range 900 to 1350°C, by measurements of the magnitude of the α→β inversion reaction.
It is well known that the extraneous Kα 2 line complicates the interpretation of X-ray diffraction spectra. Experience has shown that the arms and weights calculated by Ladell's method [Laddell, Parrish & Taylor (1959). Acta Cryst . 12 , 561–567] have to be determined for each user's X-ray diffractometer, rather t…
Twin‐roller quenching produced wide ranges of glass formation in the systems Li 2 O‐RO‐Nb 2 O 5 (R=Ba,Ca,Mg). The glass‐forming ability is improved with an increase in the ionic radius of R 2+ ions. The crystallization temperature is increased as Li 2 O is replaced by RO or the ionic radius of R 2+ ions is increased.…
Abstract Electron and X-ray scattering as well as Raman spectra of as aqueous solution of ZnBr 2 with a Br - /Zn ++ ratio of 3:1 have been studied. The existence of hexaaquo, di-, tri-and tetra-bromo complexes in solution has been established by all three methods. Octahedral hexaaquo and tetrahedral Zn(H 2 O) 4-n Br n…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly (dialkylphosphates) based on deoxyriboseGrzegorz Lapienis, Stanislaw Penczek, and Julia PretulaCite this: Macromolecules 1983, 16, 2, 153–158Publication Date (Print):February 1, 1983Publication History Published online1 May 2002Published inissue 1 February 1983https://p…
Abstract In rose-colored natural quartz crystals two new hole centers were detected and analyzed by electron paramagnetic resonance (EPR). A hole center with characteristic doublet and sextet hyperfine structures was identified as an O − ion bridging between a substitutional aluminum and phosphorus atom each. This cen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotocyclization of stilbenes. VII. Unusual fluorine atom rearrangement in the photocyclization of 1-fluoro[5]helicenesFrank B. Mallory and Clelia W. MalloryCite this: J. Org. Chem. 1983, 48, 4, 526–532Publication Date (Print):February 1, 1983Publication History Published on…
Abstract Poly(vinyl chloride) (PVC) plastisols are used for coatings, films, sheets, foams, and rotational castings. In order to satisfy the requirements for the different applications, a variety of PVC dispersion resins are manufactured. The requirements for the plastisols are many: for example, good air release, vis…
The physicochemical properties and fundamental luminescent characteristics of powder were examined for use as low‐energy‐electron (LEE) excitation phosphor. Solubility limit of Eu into was 0.05–0.06 a/o and smaller mean diameter, higher resistivity (order of 10 6 Ω · cm), and more intensive diffused reflectance were o…
A Brillouin-zone analysis based on a nearly-free electron model for tetrahedrite, an important copper antimony sulfide, successfully explains the observed compositional limits for synthetic and natural tetrahedrites. Tetrahedrite should occur with greater than 2M and up to 208 valence electrons per unit cell (filling…
The direct current electrical conductivity tensor of biotitic phyllosilicates (mica) has been measured as a function of temperature, of electric field, and of chemical composition. It is found that conductivity depends exponentially upon iron impurity content, and upon electric field at high fields. The dependence upo…
Cross‐linking methods have been investigated to determine their effect on the performance of polyvinyl alcohol (PVA) films as alkaline battery separators. The following types of cross‐linked PVA films are discussed: ( i ) PVA‐dialdehyde blends post‐treated with an acid or acid periodate solution (two‐step method, and…
It is orthorhombic with a 13.85(4), b 13.58(3), and c 9.65(3)Aa; a sub-cell with c9 = c/3 is strongly evident. The X-ray powder pattern demonstrates an isostructural relationship with gageite; the strongest reflections are: 9.59(40)(110), 6.77(80)(020), 3.378(45)(410), 3.278(40)(140), 2.714(100)(050,510), 2.674(75)(15…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-temperature metallic conductivity in a metallomacrocyclic crystal: nickel phthalocyanine iodideJens Martinsen, Richard L. Greene, Sharon M. Palmer, and Brian M. HoffmanCite this: J. Am. Chem. Soc. 1983, 105, 3, 677–678Publication Date (Print):February 1, 1983Publication…
Abstract Raman spectra have been obtained from multimicrogram samples of crystalline transplutonium (americium through einsteinium) orthophosphates. Spectra were also obtained for americium, curium, and californium trimetaphosphates. Assignments of the major Raman bands and confirmation of the compounds' stoichiometry…