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An expression is derived for the surface energy σ as a function of the size and shape of a nanocrystal. It is shown that the wider the deviation of the shape parameter f from unity, the more pronounced the decrease in the surface energy σ with a decrease in the number N of atoms in the...
The finite lifetime T g of a dynamic spiral domain in the anger state in a multidomain film with perpendicular magnetic anisotropy is estimated theoretically in the framework of a dissipative model. The finite lifetime of spiral domains is investigated as a function of the frequency of an...
The formation of a system of one-dimensional quantum conductors in porous multilayer In x Ga 1− x As/GaAs structures with a two-dimensional charge-carrier gas in the In x Ga 1− x As layers is discussed. The transition from the single-crystalline to porous matrix is studied with scanning...
Ultraviolet photoluminescence (PL) of LiB 3 O 5 (LBO) crystals has been studied under selective excitation by photons in the vacuum ultraviolet and ultrasoft x-ray regions, including the K -absorption edges of the Li and B cations and O anion. Radiative recombination of electron-hole pairs was...
The dielectric and optical (optical transmission, small-angle light scattering, birefringence) properties of PMNT-0.2 single crystals and their variation induced by a dc electric field have been studied. The birefringence was found to increase anomalously at the transition from the rhombohedral...
This paper is an overview of the studies into the effect of weak magnetic fields on the structure and mechanical properties of nonmagnetic solids of various nature (ionic, covalent, molecular, and metallic crystals, polymers, etc.). The various effects and aftereffects initiated by static,...
Dielectric spectra ɛ′(ν) and ɛ″(ν) of Ca 1− x Pb x TiO 3 ceramic samples ( x =0, 0.15, 0.2, 0.4) have been studied in the frequency range ν=7–1000 cm −1 at temperatures from 5 to 300 K using IR Fourier spectroscopy and submillimeter-range techniques. In the low-frequency range,...
A structure formed in nanocrystalline iron-carbon films exposed to an electron beam was studied. Explosive crystallization (EC) with the formation of dendrite and cellular-dendritic instabilities at a rate of up to 1 cm/s was observed. It was shown that the dependence between the growth rate of...
The temperature dependences of the molar heat capacity at constant pressure, C p , of Pb 5 (Ge 1− x Si x ) 3 O 11 crystals with x =0, 0.39, and 0.45 in the range 5–300 K, as well as of their permittivity, dielectric losses, and the pyroelectric effect, have been measured. Experimental data on...
Doping of GaN crystals prepared by various methods (HVPE and MOCVD) with various degrees of perfection of the mosaic structure, using rare-earth (RE) ions has been studied. An analysis of the shape of the photoluminescence spectra obtained before and after the doping showed that, as the defect...
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