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1.
The heat capacities of MnBr2 · 4D2O and MnCl2 · 4D2O have been experimentally determined from 1.4 to 300 K. The smoothed heat capacity and thermodynamic functions (H°TH°0) and S°T are reported for the two compounds over the temperature range 10 to 300 K. The error in the thermodynamic functions at 10 K is estimated to be 3%. Additional error in the tabulated values arising from the heat capacity data above 10 K is thought to be less than 1%. A λ-shaped heat capacity anomaly was observed for MnCl2 · 4D2O at 48 K. The entropy associated with the anomaly is 1.2 ± 0.2 J/mole K. 相似文献
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We use scanning tunneling microscopy to show that Cl2 dosing of Cl-saturated Si(100)-(2x1) surfaces at elevated temperature leads to uptake beyond "saturation" and allows access to a new etching pathway. This process involves Cl insertion in Si-Si dimer bonds or backbonds, diffusion of the inserted Cl, and ultimately desorption of SiCl2. Investigations into the etch kinetics reveal that insertion occurs via a novel form of Cl2 dissociative chemisorption that is mediated by dangling bond sites. Upon dissociation, one Cl atom adsorbs at the dangling bond while the other can insert. 相似文献
4.
We present an on-line library of unprecedented extension for high-temperature expansions of basic observables in the Ising models of general spin S, with nearest-neighbor interactions. We have tabulated through order
25 the series for the nearest-neighbor correlation function, the susceptibility and the second correlation moment in two dimensions on the square lattice, and, in three dimensions, on the simple-cubic and the body-centered cubic lattices. The expansion of the second field derivative of the susceptibility is also tabulated through
23 for the same lattices. We have thus added several terms (from four up to thirteen) to the series already published for spin S = 1/2, 1, 3/2, 2, 5/2, 3, 7/2, 4, 5, . 相似文献
5.
A. Butera M. Vsquez Mansilla A. Fainstein G. V. M. Williams 《Physica B: Condensed Matter》2002,320(1-4):316-318
We have made high-temperature (250 K<T<800 K) DC susceptibility measurements in the compounds RuSr2Eu2−xCexCu2O10 for x=0.6,0.8, and 1.0 in order to determine the Ru effective magnetic moment. After carefully subtracting all contributions to the magnetic susceptibility except that of the Ru ions, we have been able to fit the Ru susceptibility with a law χRu=χ0+CRu/(T−ΘRu). We have found that the Ru effective moment
falls between the values expected for Ru5+ in spin states
and
. We have also found a dependence of μeff(Ru) and ΘRu with the Ce content x. 相似文献
6.
A convenient one-pot method for the preparation of substituted 2-amino-1,3,4-oxadiazoles has been developed. The method is a significant improvement over previously reported syntheses. Reaction of carboxylic acids with thiosemicarbazides afforded the corresponding oxadiazoles in moderate to good yields. In general, the products precipitated from the reaction mixture, and were collected by filtration. In most of the cases, no chromatographic separations were required. To explore the scope and limitations of this reaction, various aliphatic, aromatic, and heteroaromatic carboxylic acids were reacted with different substituted thiosemicarbazides. The influence of R1 and R2 substituents on the reaction yield and additional results demonstrating the versatility of this method are presented. 相似文献
7.
C.J. Kunesh K.S.V.L. Narasimhan R.A. Butera 《Journal of Physics and Chemistry of Solids》1973,34(11):2003-2009
The structural and magnetic properties of the pseudobinary Y1?xThxFe3 and Lu1?xThxFe3 systems, having the PuNi3 structure, have been investigated. For x≤0·3, the magnetization vs temperature behavior for both systems is consistent with a simple ferromagnetic iron sublattice. For x>0·3, both systems show anomalies in M vs T and M vs H data. Lattice constants for both systems show a monotonic increase with increasing thorium content. The anomalous magnetic behavior has been explained by a Friedel-oscillation mechanism. 相似文献
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