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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bykov A. A., Terent'yev K. Yu., Gokhfeld D. M., Petrov M. I.
Заглавие : Fractal dimension of cluster boundaries in porous polycrystalline HTSC materials
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 10. - P.1947-1950. - ISSN 1063-7834, DOI 10.1134/S1063783412100095
Примечания : Cited References: 20
Предметные рубрики: CURRENT-VOLTAGE CHARACTERISTICS
ELECTRICAL-CONDUCTIVITY
PERCOLATION
MIXTURES
MEDIA
SUPERCONDUCTORS
TRANSPORT
SPHERES
Аннотация: The fractal dimension of the boundaries of clusters formed by pores and granules in polycrystalline materials is shown to be determined by the sample density and crystallite sizes. The dependence of the fractal dimension on the density has a maximum. It is shown that the maximum diamagnetic response can be obtained in a porous high-temperature superconductor with a porosity of 50-60% and small crystallite sizes.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Ovchinnikova T. M., Dyad'kov P. G., Plotkin V. V., Litasov K. D.
Заглавие : Metallic layer in the Earth's lower mantle
Место публикации : JETP Letters. - 2012. - Vol. 96, Is. 2. - P.129-132. - ISSN 0021-3640, DOI 10.1134/S002136401214010X
Примечания : Cited References: 25. - We are thankful to Dr. V. I. Anisimov for discussions. This work was supported by the Presidium of the Russian Academy of Sciences (project no. 2.16); Siberian Branch, Russian Academy of Sciences (project nos. 96 and 97); and Russian Foundation for Basic Research (project no. 12-02-90410).
Предметные рубрики: ELECTRICAL-CONDUCTIVITY
MAGNESIOWUSTITE
MECHANISM
CORE
Аннотация: We predict the insulator-metal-insulator transitions for the temperature and pressure of the lower mantle with the metal layer thickness Delta h a parts per thousand 400 km at the depth of 1400-1800 km. The insulator-metal transition has the Mott-Hubbard origin, while the second transition from metal to insulator results from spin crossover of the Fe2+ ions from high spin S = 2 to low spin S = 0 state. The conductivity in the metal layer may attain 250 S/m. The depth profile of the conductivity is also suggested.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Plotkin V. V., Dyad'kov P. G., Ovchinnikov S. G.
Заглавие : Detecting a magnesiowustite phase transition in the lower mantle by inversion of geomagnetic data
Коллективы : Siberian Branch of the Russian Academy of Sciences [96]
Место публикации : Russ. Geol. Geophys.: Elsevier Science, 2014. - Vol. 55, Is. 9. - P.1138-1145. - ISSN 1068-7971, DOI 10.1016/j.rgg.2014.08.009. - ISSN 1878-030X
Примечания : Cited References: 26. - The study was supported by the Siberian Branch of the Russian Academy of Sciences (interdisciplinary integration project no. 96).
Предметные рубрики: ELECTRICAL-CONDUCTIVITY
SATELLITE MEASUREMENTS
EARTHS MANTLE
GLOBAL MVS
INDUCTION
FIELD
METALLIZATION
Ключевые слова (''Своб.индексиров.''): magnesiowustite--metallic state--phase transition--lower mantle--conductivity--geomagnetic variations--global network
Аннотация: Global geomagnetic data are inverted for detecting a high-conductivity layer at depths of 1500-2000 km to test the hypothesis of a magnesiowustite phase transition in the lower mantle. We present the results of processing of both synthetic and global data-average monthly values of the geomagnetic field from 1920 to 2009. The inverted global data are consistent with the possible existence of a high-conductivity layer at great depths in the lower mantle.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M.
Заглавие : Influence of the dimension of a polycrystalline film and the optical anisotropy of crystallites on the effective dielectric constant of the film
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 58, Is. 8. - P.1634-1641. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783416080035
Примечания : Cited References: 41
Предметные рубрики: EFFECTIVE REFRACTIVE-INDEX
CONJUGATED POLYMER
POLY(P-PHENYLENE VINYLENE)
SPECTROSCOPIC ELLIPSOMETRY
ELECTRICAL-CONDUCTIVITY
LOCAL-FIELD
THIN-FILMS
DISPERSION
POLYFLUORENE
DEVICES
Аннотация: The dimension D of a polycrystalline film and the optical anisotropy m = εz/εx of uniaxial crystallites with the principal components εx = εy and εz of the tensor of the dielectric constant have been shown to produce a strong influence on the effective dielectric constant εD* and the effective refractive index nD* = (εD*)1/2 of the film in the optical transparency region, as well as on the boundaries of the intervals BDl ≤ εD* ≤ BDu. The intervals Δ2(m) = B2l–B2u and Δ3(m) = B3l–B3u are separated by a gap for m in the range 1 m 2, whereas the theoretical dependence ε2*(m) is separated by a gap from the interval Δ3(m) for m in the range 1 m 4. This is confirmed by a comparison of the experimental (noP) and theoretical (nD*) ordinary refractive indices for uniaxial polycrystalline films of the conjugated polymer poly(p-phenylene vinylene) (PPV) with uniaxial crystallites and appropriate values of m. In the visible transparency region of the PPV films with a change in m(λ) in the range 2 m(λ) 3 due to the dependence of the components εx,z(λ) on the light wavelength λ, the refractive indices noP2(λ) 3 near the electronic absorption band of the crystallites, the values of εoP(λ) lie in the region of the overlap of the intervals Δ2(m) and Δ3(m). The boundaries mc of the range 1 m mc are determined, for which the interval Δ2(m) is separated by a gap from the dependences ε3*(m) corresponding to the effective medium theory with spherical crystallites and hierarchical models of a polycrystal, as well as from the proposed new dependence ε3*(m).
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