排序方式: 共有62条查询结果,搜索用时 15 毫秒
1.
Yu. A. Kumzerov L. S. Parfen’eva I. A. Smirnov H. Misiorek J. Mucha A. Jezowski 《Physics of the Solid State》2003,45(1):57-60
The thermal conductivity of crystalline chrysotile asbestos made up of hollow tubular Mg3Si2O5(OH)4 filaments is measured in the range 5–300 K. The paper discusses the possibility of using this material in studies of the thermal conductivity of thin filaments of metals and semiconductors incorporated into the channels of crystalline chrysotile asbestos tubes. 相似文献
2.
A. E. Sovestnov A. A. Naberezhnov Yu. A. Kumzerov A. A. Sysoeva V. A. Ganzha A. I. Egorov N. M. Okuneva V. I. Fedorov E. V. Fomin 《Physics of the Solid State》2013,55(4):837-841
Metallic Pd synthesized in porous glass with an average pore diameter of 7 ± 2 nm has been studied using the X-ray diffraction and X-ray line shift methods for the first time. The irregular dependence of the reflection width in X-ray patterns on the diffraction angle has been revealed. This can be caused by crystallite growth mostly in the [111] direction or by tetrahedral distortions of the fcc lattice. The shift (difference in energy) of K α1 lines (ΔE α1 = 19 ± 2 meV) for nanostructured Pd in comparison with the bulk material is first detected. The detected effect is considered within the assumption of the palladium electron redistribution between Pd 5s- and 4d-bands. 相似文献
3.
A. L. Pirozerskii E. V. Charnaya M. K. Lee L. J. Chang A. I. Nedbai Yu. A. Kumzerov A. V. Fokin M. I. Samoilovich E. L. Lebedeva A. S. Bugaev 《Acoustical Physics》2016,62(3):306-312
The paper presents the results of studying the crystallization and melting processes of Ga–In eutectic alloys, which are embedded in opal matrices, using acoustic and NMR methods. The indium concentrations in the alloys were 4, 6, 9, and 15 at %. Measurements were performed upon cooling from room temperature to complete crystallization of the alloys and subsequent heating. It is revealed how the size effects and alloy composition influence the formation of phases with α- and β-Ga structures and on changes in the melting-temperature ranges. A difference was observed between the results obtained using acoustic and NMR methods, which was attributed to different temperature measurement conditions. 相似文献
4.
Vakhrushev S. B. Ivanov A. Kumzerov Yu. A. Naberezhnov A. A. Petrov A. A. Semkin V. N. Fokin A. V. 《Physics of the Solid State》2011,53(2):416-420
The specific features of the vibrational spectra of chrysotile asbestos, which is a natural mineral that represents a system
of closely packed tubular fibers with an outer diameter of ∼30 nm, an inside diameter of ∼5 nm, and a length up to a centimeter
and more, have been investigated using neutron scattering and polarized infrared spectroscopy. This material can serve as
a natural matrix for the preparation of nanostructures by filling channels with various materials. 相似文献
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The spin-lattice relaxation rate of gallium isotopes in a melt was shown by NMR to increase considerably with a decrease in
gallium particle size. The dominant relaxation mechanism of gallium embedded in an synthetic opal matrix changes from magnetic
dipole to electrical quadrupole. The increase in the correlation time of atomic motion in gallium particles with a decrease
in their size was estimated. For gallium in opal, the correlation time was found to increase by more than an order of magnitude.
It was shown that a variation in atomic mobility becomes noticeable already in gallium particles about 5 μm in size.
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Translated from Fizika Tverdogo Tela, Vol. 45, No. 12, 2003, pp. 2242–2246.
Original Russian Text Copyright ? 2003 by Tien, Charnaya, Sedykh, Kumzerov. 相似文献
7.
P. P. Parshin M. G. Zemlyanov G. Kh. Panov A. A. Shikov A. A. Naberezhnov Yu. A. Kumzerov I. V. Golosovsky A. S. Ivanov 《Journal of Experimental and Theoretical Physics》2010,111(6):996-1002
The thermal atomic vibration spectrum of lead nanostructured in porous glass with an average pore size of 7 nm and the thermal
vibration spectrum of conventional bulk lead (taken for comparison) are measured using inelastic neutron scattering. The density
of states in the phonon spectrum of lead nanoparticles is found to exceed the density of states in the spectrum of bulk lead
at both low (E < 2.5 meV) and high (E > 9.5 meV) energies. These data are used to propose a model for the structure of a porous glass-lead nano-composite. 相似文献
8.
M. Bryushinin V. Golubev Y. Kumzerov D. Kurdyukov I. Sokolov 《Applied physics. B, Lasers and optics》2009,95(3):489-495
We report an experimental investigation of the non-steady-state photoelectromotive force in nanostructured GaN within porous
glass and polypyrrole within chrysotile asbestos. The samples are illuminated by an oscillating interference pattern created
by two coherent light beams and the alternating current is detected as a response of the material. Dependences of the signal
amplitude versus temporal and spatial frequencies, light intensity, and temperature are studied for two wavelengths λ=442 and 532 nm. The conductivity of the GaN composite is measured: σ=(1.1–1.6)×10−10 Ω−1 cm−1 (λ=442 nm, I
0=0.045–0.19 W/cm2, T=293 K) and σ=(3.5–4.6)×10−10 Ω−1 cm−1 (λ=532 nm, I
0=2.3 W/cm2, T=249–388 K). The diffusion length of photocarriers in polypyrrole nanowires is also estimated: L
D=0.18 μm. 相似文献
9.
Acoustic properties of synthetic opal filled with indium at different factors of pore filling is investigated using the pulse-interference
technique in the frequency range from 4 to 8 MHz and in the temperature range of 300–480 K. A shift to lower temperatures
and widening of the indium melting region in nanopores depending on the factor of pore filling is observed. It is shown that
melting and crystallization of indium in pores during heating and cooling are accompanied with variations in velocity and
absorption of longitudinal ultrasonic waves, respectively, under conditions that the filling factor exceeds the threshold
value. 相似文献
10.