Реферат: Сryocrystall solutions formed of linear molecules with atomic components are of considerable interest as convenient model systems. It is known that in some cases Vegard\'s rule and Prigogine theory are insufficient and in this connection novel approaches are needed. One of the deviations from an ideal olution manifests itself through the anomalous behavior of the lattice parameter as a function of the composition. For explanation of the unusual concentration dependence of the lattice parameter in CO2 -Ar alloys the cluster model was used.
Do tunneling states and boson peak persist or disappear in extremely stabilized glasses?
Автор(ы): Ramos M. A.*Perez-Castaneda T.*Jimenez-Rioboo R. J.*Rodriguez-Tinoco С.*Rodriguez-Viejo J.*
Реферат: We have investigated how extreme thermal histories in glasses can affect their universal properties at low temperatures. In particular, we have studied two materials which allow us to access highly-stable glassy states, as well as their corresponding conventional glasses, in two different ways: (i) amber [1], the fossilized natural resin, which is a glass which has experienced a hyperaging process for about one hundred million years; and (ii) ultrastable thin-film glasses of indomethacin [2] (an organic molecule commonly used in pharmaceuticals), prepared by physical vapor deposition at temperatures around 85% of its glass-transition temperature.
Dynamic characteristics of the light emission, accompanying the cryocondensation of some gases
Автор(ы): Drobyshev A. S.*Aldiyarov A. U.*Kurnosov V.*Korshikov E.*Sokolov D.*Galitskaya Y.*
Реферат: Processes of thin films cryovacuum condensates of different gases, as well as their properties are theobject of attention of researchers for more than a decade. Previously, we conducted studies in which it was found interesting behavior of nitrous oxide in the process of condensation and thermal cycling of the condensed sample.
Effect of pseudorotation on isochoric thermal conductivity of hydrocarbons in disordered phases
Автор(ы): Sagan V. V.*Konstantinov V. A.*Revyakin V. P.*Karachevtseva A. V.*
Реферат: The isochoric thermal conductivity of solid five-membered heterocyclic compounds has been measured in orientationally ordered and orientationally disordered (?plastic?) phases on samples of different density in a wide interval of temperatures and pressures. The objects were: furan - C4H4O, cyclopentane - C5H10, thiophene - C4H4S. The aim of this research was to study the influence of the translation-orientational motion on the behavior of the isochoric thermal conductivity and to estimate the possible contribution of pseudorotation to the total heat transfer.
Energy spectrum of the quantum vortices configurations
Реферат: A review of various exactly solvable models on the determination of the energy spectra E (k) of 3D-velocity field, induced by chaotic vortex lines is proposed. This problem is closely related to the sacramental question whether a chaotic set of vortex filaments can mimic the real hydrodynamic turbulence [1]. The quantity v(k)v(-k) can be exactly calculated, provided that we know the probability distribution functional P({s(\xi ,t)}) of vortex loops configurations.
Enhanced desorption from solid deuterium driven by charging with keVelectrons
Реферат: Films of solid deuterium at a temperature around 3 K have been irradiated by 1.5 or 2 keV electrons. The films were deposited on the silver electrode of a quartz crystal microbalance (QCM) suspended belowa pumped liquid helium cryostat [1,2]. The thickness of the films ranged from 10 nm to up to 5 ?m. The initial film thickness and the mass loss as result of desorption were monitored by the QCM. The electron beam current was kept at about or below 100 nA to avoid beam-induced evaporation.
Equilibrium crystal shape of 4He under microgravity
Реферат: The growth coefficient of 4He crystal which is grown from the superfluid becomes divergently large towards T=0, and the crystal relaxes to the equilibrium state in a very short period. We have succeeded in cooling 4He crystal down to 150 mK by the specially designed dilution refrigerator under microgravity of parabolic flight for 20 seconds. Using this fridge, we were able to obtain beautiful pictures of the crystal with 3 facets, c-, a-, and s-, under the equilibrium condition at 150 mK for the first time.
Exciton transport and orientationalglassification point in doped C60
Автор(ы): Strzhemechny M. A.*Zinoviev P. V.*Zoryansky V. N.*
Объем документа: С. 25-26
МРНТИ: 29.31.23*
Ключевые слова: точка стеклования*экситоны*рентгеноструктурный анализ*люминесценция*
Реферат: Below 95 K, pristine fullerite C60 is in the state of orientational glass with all molecules performing rotational oscillatory motion. However not all the mutual orientations of pairs of molecules are energetically favorable. Saturation of fullerite with gases changes the situation. There were controversies [1,2] concerning what happens with the orientational glass state when C60 is stuffed with, for instance, with CO or NO. Physics and Engineering, National Academy of Ukraine.
Field-emission source of chages based on nanotubes for low temperature experiments
Автор(ы): Borisenko D. N.*Walmsley P. M.*Golov A. I.*Kolesnikov N. N.*Kotov Yu. V.*Levchenko A. A.*Fear M. J.*
Реферат: In this report we present two methods of production of field-emission charge sources based on carbon nanotubes, that can be used in low-temperature investigation of properties of injected charges in cryogenic liquids and crystals. The sources were made from metal disks with a diameter of 10 mm and thickness of about 1 mm. The thermal emission on a source does not exceed E<10-6 W.
Glassy crystals of adamantane derivatives induced by thermal treatment
Автор(ы): Szewczyk D.*Jezowski A.*
Объем документа: С. 29-30
МРНТИ: 47.09.45*
Ключевые слова: стекловидное состояние*адамантан*фазовый переход первого рода*пластический кристалл*
Реферат: Observing a first-order transition between the supercooled liquid state and a new amorphous phase, the \"glacial state\" has been one of the most interesting focus during the last decades. At present the glacial state is seen as an interrupted crystallization due to the low crystal growth rate from the glass state. In this work, we will describe the first glacial state obtained from a plastic crystal for two materials - adamantine derivatives.
