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81.
Hamlet G. Badalyan 《Molecular Crystals and Liquid Crystals》2015,611(1):208-212
It is known that Hall effect takes place in different media. The Hall effect is well studied in semiconductors. It is known quantum, quantum spin, the anomalous Hall effect, as well as the Hall effect in ionized gases. However, up to date, as evidenced from the review of scientific literature, the study of this effect in lyotropic liquid crystals (LLC) was given insufficient attention. In this paper the peculiarities of the Hall effect in the LLC were studied. It was shown that in liquid crystal systems Hall potential is approximately 100 times greater than in semiconductors. Also it was shown that after removal of the electric and magnetic fields, the Hall potential in LLC remained intact, decreasing over time, and periodically reversing its sign. 相似文献
82.
K. T. Avetyan L. V. Levonyan H. S. Semerjyan O. M. Badalyan 《Journal of Contemporary Physics (Armenian Academy of Sciences)》2014,49(3):127-131
It is experimentally established that, in the majority of cases, the X-ray radiation scattered on different constituent parts of a weakly absorbing object provides sufficient information on inner structure, different types of structural inhomogeneities, and morphological characteristics, such as shapes, sizes, and location of invisible defects of the object. In this study, a new method for investigation of the inner structure of noncrystalline materials is developed. The method is based on recording of the scattered X-ray radiation. It is demonstrated that the image contrast, formed by the X-ray radiation scattered on weakly absorbing objects, can be considerably higher than the absorption contrast. 相似文献
83.
A. G. Badalyan D. Azamat R. A. Babunts E. V. Neverova A. Dejneka V. A. Trepakov L. Jastrabik 《Physics of the Solid State》2013,55(7):1454-1458
Chromium centers and their charge compensation in two single strontium titanate crystals, i.e., SrTiO3: Cr (0.05 at %) and Sr0.9995TiO3: Cr0.0005 grown with strontium deficiency, have been studied by the electron paramagnetic resonance method. The crystals have been investigated both immediately after growth and after oxidation and reduction procedures. Oxidation and reduction are performed by crystal annealing in a corresponding gas atmosphere at high temperature. Chromium centers associated with oxygen vacancy (Cr3+-V O) are detected in the reduced crystals. It is shown that strontium vacancies are formed in the crystal grown with strontium deficiency, which leads to a lowering of the tetragonal symmetry of (Cr3+-V O) and Cr5+ centers to the orthorhombic symmetry. Possible compensation mechanisms for charges of various chromium centers are considered. 相似文献
84.
A. Badalyan V. Chaltykyan G. Grigoryan A. Papoyan S. Shmavonyan M. Movsessian 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,37(2):157-162
Selective reflection of laser radiation from the interface between atomic
vapor and a dielectric is studied for a wide range of vapor density. A
self-consistent model is developed, some analytical results are obtained, as
well as a number of curves are computed that are in good agreement with
experimental spectra measured in cesium and rubidium vapor cells. 相似文献
85.
P. G. Baranov N. G. Romanov A. G. Badalyan D. O. Tolmachev V. L. Preobrazhenskii 《JETP Letters》2005,82(11):727-730
It is found that the energy released in the spin-dependent tunneling recombination of electron-hole pairs and self-trapped excitons in an ionic crystal matrix is directionally transferred to low-dimensional semiconductor structures embedded in the matrix as a result of self-assembled growth. The EPR spectra of electron and hole centers in the matrix crystal are detected by tunneling afterglow and photostimulated luminescence that are excited in the low-dimensional structure. 相似文献
86.
87.
We describe procedures to propagate the uncertainty in adsorption data and alpha(S)-values to generate uncertainty in apparent primary, secondary, and total micropore volumes for porous activated carbons exhibiting Type I and IV character. The alpha(S)-data are interpolated from selected non-porous reference material (NPRM) adsorption isotherm data with some adsorbents exhibiting surface chemistry quite different from and some similar to that of the porous adsorbents (PA). We show that a statistically constant apparent total micropore volume can be determined independent of the NPRM surface chemistry. In contrast, NPRM surface chemistry appears to influence our ability to identify unequivocally the filling and condensation ranges of micropore filling, leading to statistically different apparent primary and secondary micropore volumes. 相似文献
88.
A. S. Manukyan A. A. Mirzakhanyan G. R. Badalyan G. H. Shirinyan E. G. Sharoyan 《Journal of Contemporary Physics (Armenian Academy of Sciences)》2010,45(3):132-136
Using the solid-phase pyrolysis and chemical vapor deposition of nickel-phthalocyanine, we have fabricated ferromagnetic Ni
nanoparticles in carbon matrices. The composition, structure, morphology, and magnetic properties of samples were investigated
by means of scanning electron microscopy, energy dispersive X-ray microanalysis, X-ray diffraction technique, and ferromagnetic
resonance. It is shown that the sizes of nanoparticles can be varied from ∼10 nm to ∼500 nm depending on the temperature and
time of pyrolysis. The used method allows us to synthesize metal nanoparticles in different carbon matrices: in amorphous
carbon plates, in graphitic capsules, and in carbon nanotubes. 相似文献
89.
D. M. Sedrakyan P. G. Petrosyan L. N. Grigoryan V. D. Badalyan 《Technical Physics》2011,56(11):1640-1645
The transmission spectra of silicate glasses containing CdS1 − x
Se
x
semiconducting nanocrystals of various sizes are investigated in the temperature range 20–300°C. It is shown that for explaining
optical properties of these materials, not only the nanocrystal sizes, but also the structural changes occurring in nanocrystals
during their formation must be taken into account. 相似文献
90.