Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Tetragonal and rhombohedral phases always coexist in Pb(Zr x Til 1−x )0 3 near the morphotropic phase boundary compositions (0.52≤x≤0.55) when prepared by solid‐solid reaction among the constituent oxides. A special technique was developed to obtain perovskite ceramics exhibiting no co‐existence in the boundary compos…
Abstract The crystallization and melting behavior of the system N ‐methylmorpholine‐ N ‐oxide (MMNO)–H 2 O–cellulose has been studied by differential scanning calorimetry, optical and electron microscopy, and x‐ray scattering. The phase diagram of the MMNO–H 2 O solvent system is reported up to a water content of 28%…
Article Polymorphie, Leitfähigkeit und Kristallstrukturen von Oxo-phthalocyaninato-titan(IV) was published on October 1, 1982 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 159, issue 1-4).
Abstract Exchange reactions in molten bisphenol‐A polycarbonate–poly(butylene terephthalate) mixtures are investigated by means of model reactions. Transesterification can result either from direct ester‐ester interchange or via alcoholysis or acidolysis. Among the various reactions investigated, only the PBTP alcohol…
Abstract The rheological properties of a thermotropic polyester were determined in the nematic and isotropic states. In the isotropic state, the viscosity is almost constant and the polymer is only slightly elastic. The nematic phase has a lower viscosity than the isotropic, except at low frequencies or shear rates, w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination intercalation reactions of the layered compounds vanadyl phosphate (VOPO4) and vanadyl arsenate (VOAsO4) with pyridineJack W. Johnson, Allan J. Jacobson, John F. Brody, and Suzanne M. RichCite this: Inorg. Chem. 1982, 21, 10, 3820–3825Publication Date (Print):Oc…
Abstract The structure of the four‐component copolyester resulting from the exchange reaction between molten bisphenol‐A polycarbonate and poly(butylene terephthalate) is analyzed as a function of the reaction time by infrared and nuclear magnetic resonance spectroscopy. By applying a statistical method developed earl…
Anisotropy Induced during Compression Molding o f RubberMany physical tests of elastomeric vulcanizates are carried out using specimens cut from flat sheets that were prepared by compression molding.Generally, an excess quantity of rubber is placed into the mold to assure that the mold cavity will be completely filled…
X-ray absorption spectroscopy has been used to study the dimeric iron center in azidomethemerythrin from Phascolopsis gouldii. Absorption edge data confirm that the two iron atoms are present as Fe(III) and suggest a hexa-coordination site for each of the iron atoms. The extended x-ray absorption fine structure (EXAFS…
Many of the techniques available to determine energy content have problems inherent in their use on samples with a high proportion of inorganic minerals. One technique which may readily be used on such samples is wet oxidation, in which the sample is quantitatively chemically oxidized. However, this technique is infre…
The precipitation process of solid phases Mg 3 (OH) 5 CI‐4H 2 O (phase 5), Mg 2 (OH) 3 CI‐4H 2 O (phase 3), and Mg(OH) 2 was followed by the addition of NaOH water solution in MgCl 2 water solutions of different concentrations (0.001 to 4.8 mol dm −3 ) and characterized by chemical, potentiometric, coulometric, and X‐…
The Abbe transform is used to derive rigorous algebraic formulas for the wave function describing Fraunhofer diffraction at apertures in the form of arbitrary polygons. Two remarks bring the Abbe transform and the Abbe theorem into the context of the history of diffraction.
Formation of BaTiO 3 ‐SrTiO 3 solid solution during sintering of powder mixtures is characterized by preferential diffusion of Ba 2+ ions. As a consequence, several nonequilibrium phases are temporarily formed; they were identified by X‐ray and microprobe analysis. Eutectic liquid appears below 1300°C, which may expla…
Abstract Mixed-layer clays composed of randomly interstratified kerolite/stevensite occur as lake and/or spring deposits of probable Pliocene and Pleistocene age in the Amargosa Desert of southern Nevada, U.S.A. The percentage of expandable layers of these clays, determined from computer-simulated X-ray diffractograms…
We have studied the adsorption of pure CO and CO:H2 mixtures on powdered ZnO using the combined techniques of transmission infrared spectroscopy and temperature programmed desorption (TPD). When CO is adsorbed alone, the vibrational frequency ωCO decreases from 2192 to 2178 cm−1 with increasing CO coverage, and a repu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMelting-crystallization and premelting properties of sodium nitrate-potassium nitrate. Enthalpies and heat capacitiesDerek J. Rogers and George J. JanzCite this: J. Chem. Eng. Data 1982, 27, 4, 424–428Publication Date (Print):October 1, 1982Publication History Published onli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew copper chemistry. V. New heterocuprates with greatly improved thermal stabilitySteven H. Bertz, Gary Dabbagh, and G. M. VillacortaCite this: J. Am. Chem. Soc. 1982, 104, 21, 5824–5826Publication Date (Print):October 1, 1982Publication History Published online1 May 2002Pu…
The fabrication of transparent conducting films of ZnO is described. These films are deposited on room temperature glass substrates using an enhanced reactive evaporation technique in which the power in a dc glow discharge, the oxygen pressure, and the zinc evaporation rate are controlled separately. Each of these par…
Abstract Deposits of sepiolite, trioctahedral smectite (mixed-layer kerolite/stevensite), calcite, and dolomite, found in the Amargosa Flat and Ash Meadows areas of the Amargosa Desert were formed by precipitation from nonsaline solutions. This mode of origin is indicated by crystal growth patterns, by the low Al cont…
We explain the compensation effect by counting the ways in which the heat bath can furnish the energy necessary to surmount the barriers.Received 15 March 1982DOI:https://doi.org/10.1103/PhysRevB.26.3774©1982 American Physical Society