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81.
V. V. Val’kov A. A. Golovnya 《Bulletin of the Russian Academy of Sciences: Physics》2007,71(5):667-669
The concentration dependence of the transition temperature to the superconducting phase is calculated within the t – t' – t" – J* model, which takes into account tree-site interactions. It is shown that the processes of scattering by spin fluctuations qualitatively change the character of the concentration dependences T c (n). These scattering processes in the normal phase significantly modify the distribution function of Hubbard fermions, determining the pronounced non-Fermi-liquid behavior of the system. 相似文献
82.
The partial molar free energy, enthalpy, and entropy of sorption of C11−C23
n-alkanes were calculated on the basis of the GC data obtained on the glass capillary column coated with fullerene C60 (Ful-60) as stationary phase. The thermodynamic parameters ofn-alkane sorption on a column with Ful-60 and a fused silica capillary column with polydimethylsiloxane OV-1 were determined
and compared. The enthalpy-entropy compensation effect for the sorption ofn-alkanes on Ful-60 and OV-1 was found. A linear dependence of the partial molar free energy ofn-alkane sorption on the temperature of analysis and carbon chain length was found. The free energy contributions of the methylene
groups were calculated, and their temperature dependences were studied. The differences in the temperature dependences of
the energy contributions of methylene groups ofn-alkanes on Ful-60 and OV-1 were revealed. The entropy contribution is 68–82% of the enthalpy contribution which indicates
a substantial role of the number of contacts with Ful-60 in retention ofn-alkanes. The ability of Ful-60 for dispersive interactions is similar to those of nonpolar liquid phases and substantially
differs from that for carbon adsorbents. Fullerene columns were shown to be convenient for analysis of highly boiling organic
substances in aqueous and organic solutions.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1490–1495, August, 1999. 相似文献
83.
Resonant ultrasound spectroscopy was used to measure the elastic constants of bcc Ta0.33V0.67 over the temperature range 3.5–300?K; the results were compared to earlier measurements on C15 TaV2. The temperature dependence of the polycrystalline shear modulus is completely different in the two phases; that of the bcc phase decreases with temperature whereas that of the C15 phases increases in an anomalous fashion. This difference is consistent with a model involving doubly-degenerate levels at the X point of the Brillouin zone in the C15 phase with the Fermi level lying near the doubly degenerate level. This model accounted for the unusual behaviour of the C15 phase. Debye temperatures were determined from the ultrasonic measurements: 295?K for the C15 phase and 315?K for the bcc phase. 相似文献
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