Materials Literature
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Hexagonal nickel sulphide shows a transition at 260 K from an antiferromagnetic to a paramagnetic state which is accompanied by an abrupt change in the conductivity. It is suggested that this is not a Néel temperature, that is a destruction of long-range order, but a first-order disappearance of the moments, and that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConfirmation of biprotonic phototautomerism in 7-azaindole hydrogen-bonded dimersKenneth C. Ingham, M. Abu-Elgheit, and M. Ashraf El-BayoumiCite this: J. Am. Chem. Soc. 1971, 93, 20, 5023–5025Publication Date (Print):October 1, 1971Publication History Published online1 May 2…
The properties of ferroelectric and ferroelastic crystals are examined in terms of atomic arrangement. Ferroelectric crystals are divided into three classes according to the predominant nature of the atomic displacements required by polarity reversal. The one-dimensional class involves atomic displacements parallel to…
A computer procedure for slit-height correction of X-ray small-angle scattering curves is described, which Ij based on direct calculation of the desmeared intensity values Ij from the equations Ĩi = ∑jai,jIj where Ĩi is the observed smeared intensity at point i and ai,jIj represents the contribution from a point j alo…
Abstract Colicin E1 was purified from mitomycin C-induced Escherichia coli JC411 (ColE1) by salt extraction of extracellular, bound colicin followed by ammonium sulfate fractionation and ion exchange chromatography. The purified preparation was considered homogeneous by several criteria. Gel filtration on Sephadex G-2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses and photochemistry of 1,2,3-trisilacycloheptane derivatives. Precursors for tailor-made organosilylenesHideki Sakurai, Yoshiteru Kobayashi, and Yasuhiro NakadairaCite this: J. Am. Chem. Soc. 1971, 93, 20, 5272–5274Publication Date (Print):October 1, 1971Publication…
The history of ferroelectricity is carried to the discovery of the ferrolectric properties of barium titanate in 1943. A few more recent events are noted briefly.
It is shown that because of the unique properties of the soft ferroelectric mode in perovskites of the BaTiO3-type, as well as in related displacive ferroelectrics, the Gruneisen parameter γf of this mode and its temperature dependence can be simply determined from measurements of the pressure and temperature dependen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuenching of the phosphorescence of some chromium(III) complexes by molecular oxygenAchim PfeilCite this: J. Am. Chem. Soc. 1971, 93, 21, 5395–5398Publication Date (Print):October 1, 1971Publication History Published online1 May 2002Published inissue 1 October 1971https://pu…
The problem of protecting spacecraft from high temperature encountered during a mission has resulted in the development of several types of thermal protection systems which are described here.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of tetraselenium bis(hydrogen disulfate)I. D. Brown, D. B. Crump, and R. J. GillespieCite this: Inorg. Chem. 1971, 10, 10, 2319–2323Publication Date (Print):October 1, 1971Publication History Published online1 May 2002Published inissue 1 October 1971https:/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of Infinite Dilution Activity Coefficients with Wilson's EquationL. B. Schreiber and C. A. EckertCite this: Ind. Eng. Chem. Process Des. Dev. 1971, 10, 4, 572–576Publication Date (Print):October 1, 1971Publication History Published online1 May 2002Published inissue 1 Oct…
Transmissivities were measured and absorption coefficients derived for three types of fused quartz between room temperature and 1500 degrees C: GE uv Type 151 (0.21-2.0 mu), GE ir Type 105 (0.21-3.5 mu), and Corning Vycor ir glass No. 7905 (1.7-4.0 mu). Less extensive measurements were also performed with Corning uv T…
The Electronic Structure of Some Palladium Alloys Studied by ESCA and X-ray Spectroscopy, J Hedman, M Klasson, R Nilsson, C Nordling, M F Sorokina, O I Kljushnikov, S A Nemnonov, V A Trapeznikov, V G Zyryanov
The calculated value of the effective atomic number (z tau ) of 7.23 for lithium tetraborate (Li 2 B 4 O 7 ) agrees closely with the value of 7.22 for soft tissue of composition C 5 H 40 O 18 N. For excised muscle specimens the experimental value (7.42) obtained by Spiers for z tau is very nearly equal to the correspo…
Deformation twinning has been observed in shock-loaded samples of heat-treated Ferrovac E iron at peak stresses from 3 to 16 kbar. In this range, the volume fraction of twins increases monotonically from zero to approximately 4%. In instrumented transmitted-wave measurements stress relaxation was observed behind the e…
A summary is given of mechanisms which may be responsible for non-ohmic conduction due to strong fields in thin films of non-crystalline semi-conductors. This is used for a discussion of the mechanism of threshold switching in thin films of chalcogenide semicondutors. The predictions of the thermal mechanism are outli…
A piezoelectric ceramic material having low dielectric constant, high thickness coupling factor, high mechanical quality factor, high stability, and high operating temperature, has been prepared from PbTiO3 incorporated with 2.5 mol% of LaO12 and 1.0 mol% of MnO2. Typical electromechanical constants of this material a…
Abstract The validity of boron as a salinity index has been established by numerous studies over the past 2 decades. It is known that all the major clay minerals may contain boron which can be correlated with paleosalinity. However, under given conditions, illites will contain the most boron and kaolinites the least.…
Thermal quenchings of +3 rare-earth line emissions were measured for excitation into the 4fn emitting states. These quenchings differ from corresponding quenchings reported by Wickersheim and Buchanan for band-gap excitation. For Tb+3, Tm+3, and possible Pr+3, the quenchings from the 4fn emitting states are attributed…