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The temperature dependence of the expansion ɛ C of trans conformers of the carbon skeleton of macromolecules in crystallized and amorphous poly(ethylene terephthalate) (PET) due to zero-point and thermal atomic vibrations is investigated by IR spectroscopy. It is found that the thermal expansion...
Iron monosilicide is used to study the possibility of the semiconductor-metal kinetic phase trans-formation in nearly magnetic semiconductors. It is shown that the heat released by current flow gives rise to a growth in amplitude of spin fluctuations and the attendant splitting of electronic...
The magnetic and elastic properties of the Bi 1- x Ca x MnO 3 manganites are studied. The phase transformations revealed are ferromagnet-spin glass ( x ≥0.15) and spin glass-charge-ordered antiferromagnet ( x ≥0.25). The ferromagnetic state is characterized by ordering of the Mn 3+ d x 2 - y...
Multidimensional theory of first-order phase transitions in the vicinity of a one-dimensional saddle point is considered. Transformations of the variables describing new-phase nuclei are suggested; these transformations allow one to completely separate the variables in the Fokker-Planck equation...
Switching kinetics of uniaxial ferroelastic ferroelectrics (FFs) in external electric and stress fields is studied using classical theory of nucleation and growth. The stage in which the polarization and deformation reversal involves the main body of the FF and the final stage (Ostwald ripening)...
The infrared (IR) and Raman spectra of vitreous poly(methyl methacrylate) (PMMA) are measured and investigated in the frequency range 10–150 cm −1 . A comparison of the results obtained from IR and Raman spectroscopic measurements permits the assignment of the low-frequency anomaly (boson...
This paper reports on the results of investigations of the thermal conductivity along the three crystallographic directions in bismuth tellurite crystals. It is found that bismuth tellurite exhibits a low thermal conductivity inherent in glasses and disordered solid solutions. At temperatures...
A comparative analysis of the spectral characteristics of self-trapped excitons (STE) and F 2 centers in the states with the same spin multiplicity is carried out. Based on the analysis, a criterion for the separation of the triplet-triplet ( T-T ) absorptive transitions in the electronic and...
The energy of intersubband collective spin-and charge-density excitations is calculated for a system of quasi-two-dimensional electrons at certain values of the angular-momentum component perpendicular to the plane of the electron free motion. The calculation is carried out within the...
The reasons for anomalous growth in the thermopower of metal borides at high temperatures is analyzed. It is shown that this behavior of thermopower cannot be explained within the present models of charge transfer in disordered semiconductors. The anomalous growth of thermopower in polar...
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