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。
Single crystals of high-purity (RRR\simeq4000) niobium were tested in tension in the temperature range of 2 K–350 K to study the low temperature plasticity. Activation analyses of the results showed that an Arrhenius type strain-rate equation appeared to hold above 50 K but not below this temperature. Increase of the…
Abstract The structural relations of solid solutions in the series (Sr 1−x Ba x )Al 2 O 4 were studied using room- and high-temperature X-ray methods, infra-red spectroscopy, and DTA. At room temperature, SrAl 2 O 4 and solid solutions with x up to 0.31 are monoclinic, between x = 0.31 and 0.43 monoclinic and hexagona…
From microscopical observations and structural studies on the mesophases of a new thermotropic polar compound — the nitrobenzoyloxybenzoate of octylphenyl — we have shown the existence of a novel fluid mesophase built with ribbons forming a two-dimensional oblique lattice. We propose a crude model based upon structure…
The photosensitivity of heteropoly-compounds in the presence of organic compounds, which results in reduction of the former and oxidation of the latter, coupled with the ease of reoxidation, by oxygen, of some of the heteropoly-compounds, provides the basis for photocatalytic oxidation of organic compounds.
A convenient General synthesis, applicable to alkanes and terminally mono- and di-substituted alkanes of any chain length, is described; cyclododecanone is used as the starting material, and the C12 chain is doubled in length as often as required and adjusted first to a multiple of 12, and than to any desired length.
A 3-stage GaAsFET amplifier operating at 13 K, utilizing source inductance feedback is described. The amplifier has a noise temperature of15 dB over the 1.2- to 1.7-GHz frequency range.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe heteropolyvanadate of phosphorus. Crystallographic and NMR studiesReizo Kato, Akiko Kobayashi, and Yukiyoshi SasakiCite this: Inorg. Chem. 1982, 21, 1, 240–246Publication Date (Print):January 1, 1982Publication History Published online1 May 2002Published inissue 1 Januar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational investigations of polyoxometallates. 1. Valence force field of Mo6O192- based on total isotopic substitution (oxygen-18, molybdenum-92, molybdenum-100)Claude Rocchiccioli-Deltcheff, Rene Thouvenot, and Monique FouassierCite this: Inorg. Chem. 1982, 21, 1, 30–35Pu…
Structural, thermodynamic, and kinetic properties and phase diagrams of hydrogen in metals and alloys are presented in relation to materials development for the ‘hydrogen energy technology'. Among the materials considered special attention is paid to the hydrides of Li, Mg, Y, V, Nb, U, TiFe, and LaNi5. It is shown ho…
The growth of the snow crystal is an important example of crystal growth not attributable to the presence of screw dislocations. More than 400 years of study of the habits of these crystals culminated in the work of Nakaya establishing the complex and abrupt changes of crystal habit with temperature and humidity, and…
Quantitative phase analysis by powder diffractometry requires accurate measurement of the integrated intensities of the diffracted, lines. When lines are isolated and on simple backgrounds, count integration techniques work very well. However, when one or more lines overlap the line of interest, or a complex backgroun…
Crystal structures for the electron donor DBTTF and its charge-transfer salts with the acceptors TCNQ and 2,5-TCNQF2 are reported. Crystal data for the three systems are as follows: (a) neutral DBTTF; monoclinic, space group P21/c, a=12.082(2) Å, b=3.955(1) Å, c=14.553(2) Å, β=114.36(1)0, V=633.6 Å3; (b) DBTTF-TCNQ; t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemporary anion states of phosphabenzene, arsabenzene, and stibabenzene. Trends in the .pi. and .pi.* orbital energiesP. D. Burrow, A. J. Ashe III, D. J. Bellville, and K. D. JordanCite this: J. Am. Chem. Soc. 1982, 104, 2, 425–429Publication Date (Print):January 1, 1982Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties of low molecular weight block copolymers. 1. Differential scanning calorimetry of styrene-dimethylsiloxane diblock copolymersSonja Krause, Magdy Iskandar, and Mohammad IqbalCite this: Macromolecules 1982, 15, 1, 105–111Publication Date (Print):January 1, 1982Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanisms for the photooxidation of protoporphyrin IX in solutionG. Sidney Cox and David G. WhittenCite this: J. Am. Chem. Soc. 1982, 104, 2, 516–521Publication Date (Print):January 1, 1982Publication History Published online1 May 2002Published inissue 1 January 1982https:/…
A series of dimeric copper(II) co-ordination compounds with general formula [Cu2(tmbma)2(azolate)]X3 has been prepared and characterized, where tmbma is the tripodal benzimidazole-containing ligand tris(N-methylbenzimidazol-2-ylmethyl)amine, azolate is the anion of imidazole, benzimidazole, or benzotriazole, and X = N…
Mineralogical properties of tobelite, a new ammonium-dominant dioctahedral mica, found in the Ohgidani pottery stone deposit at Tobe, Ehime Prefecture, Japan, are described.This mineral, accompanied by quartz, occurs as a hydrothermal alteration product of a biotite andesite dyke. Wet chemical analysis gives a structu…
The phase transitions in {N(CH 3 ) 4 } 2 XBr 4 (X: Zn, Co, Cu) were stuided by dielectric measurements. A phase transition which accompanied with a break on the dielectric constant vs temperature curve was found at 13.5°C and 13.8°C for {N(CH 3 ) 4 } 2 ZnBr 4 and {N(CH 3 ) 4 } 2 CoBr 4 , respectively. In {N(CH 3 ) 4 }…
Nous présentons une nouvelle et remarquable séquence mésomorphe dans un produit pur : le 4-nitrobenzoyloxybenzoate de 4-nonyloxyphényle à la pression atmosphérique : K(SC2)S ?SA1NreSAd reNreSAd NI. Cette séquence comporte deux phases nématiques rentrantes (phénomène jamais observé à ce jour) et une phase smectique SAd…
Decomposition of the Martensite in Two-Phase Titanium Alloys.- The Investigation of the Titanium Structure after Shock Wave Loading.- Embrittlement and Spontaneous Cracking of a Hardened (?+?) Titanium Alloy during Aging.- Transformation in Unstable Beta-Titanium Alloys.- Internal Friction Studies in Stable and Metast…