Materials Literature
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A high-pressure furnace that operates up to 2000°C in the pressure range of 100 atm to 10−5 torr was designed and constructed to saturate UO2 powder of 4-µm average particle size with 4He. The powder was then dissolved in a fused salt in an induction chamber. The released 4He was mixed with a known quantity of 3He, an…
Luminescence spectra of Sm 3+ at a Ti 4+ site in BaTiO 3 host lattice were investigated in a wide range of temperatures including those above the Curie point. Any shifts of emission lines were not observed between -196°C and 145°C. The ferro-to-paraelectric transition is considered not to influence the strength of the…
Abstract After it had become known that three types of condensed inorganic phosphates, i.e. metaphosphates, polyphosphates, and ultraphosphates, exist, attempts were made to elucidate their formation, properties, and mutual relationships. Metaphosphates and polyphosphates containing up to eight or ten monomer units ca…
Optical absorption data are presented for Na 2 O 2 SiO 2 glass containing vanadium equilibrated in various states of oxidation. Spectra of 5 + , 4 + , and 3 + vanadium were derived. The variation in amounts of the three species is in accord with mass action considerations. The spectra are related to crystal field assi…
Phase transitions of ferroelectric NaNo 2 crystal around 164°C were studied by calorimetric and dilatometric methods. The values of both heat capacity and molar volume show an abrupt increase at about 163°C, indicating that this transition is of the first order. In the region of 164∼165°C, a small broad peak was obser…
Point defect clusters and dislocation loops produced in bulk uranium dioxide by fission damage have been observed and studied by transmission electron microscopy. Clusters 25 Å in diameter are first observed at a dose of 4.3 × 1015 fissions cm−3. With increasing dose, these clusters quickly grow into resolvable prisma…
The thermal decompositions of BaTiO(c 2 O 4 ) 2 .‐ 4H 2 O, BaTiO(OH) 2 C 2 O 4 .2H 2 O, SrTiO(C 2 O 4 ) 2 .‐ 4H 2 O, and SrTiO(OH) 2 C 2 O 4 .H 2 O were investigated using TGA, DTA, and effluent gas analysis. The stoichiometry of the decompositions is discussed and it is proposed that a reduced state of titanium is fo…
The diurnal migratory rhythm of the epipelic diatom association of freshwater streams has been investigated in laboratory studies. Movement of the diatom flora up to the surface of the sediment and down beneath the surface occurs once every 24 hours reaching a peak of cell numbers at the surface at approximately the s…
Crystal field theory developed by Abragam and Pryce has been used to formulate the anisotropic exchange interactions in CoCl 2 ·2H 2 O and CoBr 2 ·2H 2 O. These crystals are antiferromagnets in which Co ++ ions form ferromagnetic linear chains coupling antiferromagnetically to adjacent chains. There are two abrupt jum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric Dispersion of Crystalline Powders of Amino Acids, Peptides, and Proteins1S. Takashima and H. P. SchwanCite this: J. Phys. Chem. 1965, 69, 12, 4176–4182Publication Date (Print):December 1, 1965Publication History Published online1 May 2002Published inissue 1 Decemb…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of Glass and Ceramic Frit by Atomic Absorption SpectrophotometryAntrim H. JonesCite this: Anal. Chem. 1965, 37, 13, 1761–1762Publication Date (Print):December 1, 1965Publication History Published online1 May 2002Published inissue 1 December 1965https://pubs.acs.org/…
Abstract A study of the growth of needle crystals of monosodium urate was undertaken with the aim of finding inhibitors which might be able to prevent the acute gout attack. Rates of crystal growth at various levels of supersaturation are described. Two potent crystal growth inhibitors, Bismarck brown and methylene bl…
Abstract Differential thermal analysis was used to study the effect of a diluent, glycerol, and copolymer units, acetate groups, on the melting point of poly(vinyl alcohol) (PVA). The melting point of PVA was found to be 228°C. and the heat of fusion by the diluent and copolymer methods was 1.64 and 0.56 kcal./mole, r…
X-ray photographs of (Ca, Na)CO 3 cancrinites show diffuse satellites with the indices ( h k l ± 3/7), The examined crystals from Litchfield, U.S.A., have the space group P 6 3 and the lattice dimensions a = 12.75 Å and c = 5.14 Å. The crystal structure has been determined–independently of all previous structure assum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of a Collagen from Codfish Skin Containing Three Chromatographically Different α Chains*Karl A. PiezCite this: Biochemistry 1965, 4, 12, 2590–2596Publication Date (Print):December 1, 1965Publication History Published online1 May 2002Published inissue 1 Decem…
Abstract Shortly, lightweight, inexpensive, precision, space‐filling atomic models particularly suitable for constructing macromolecules of biological interest will reach the scientific community. The availability of the models, the Corey‐Pauling‐Koltun, or C‐P‐K Models, will conclude a five‐year program which has inv…
Ceramic and electrical properties and crystal structures of the system Pb(Mg l/3 Nb 2/3 ‐ PbTiO 3 ‐PbZrO 3 are described. The system is composed of three crystal phases at room temperature: pseudocubic, tetragonal, and rhombohedral. A high dielectric constant and radial coupling coefficient and low resonant resistance…
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